JPH0780480A - Water purifying apparatus - Google Patents

Abstract

PURPOSE:To suppress the formation of a harmful excess and deficiency reaction substance and the inorg. reaction of a modifying substance and to enhance the absorption and effective utilization efficiency of ozone by stepwise treating a contaminant using a waste ozone contact device, a recovered ozone contact device and a generated ozone contact device. CONSTITUTION:A sludge component B is removed from raw water A in a pretreatment device 1 to obtain treated water C which is, in turn, introduced into a waste ozone contact device 2. This treated water C is supplied to a falling water stream D to be allowed to fall through a falling pipe 3 together with waste ozone X injected while sucked by compressed air T and reversed to a rising pipe 4 to form a rising water stream E which is, in turn, supplied to a head tank 5. The treated water is allowed to overflow a collecting return device 6 and a part thereof is returned to the falling pipe 3 and the remainder thereof is extracted to a separating return device 12. Biologically treated water F from which a fluidized biological carrier and peeled bacterial cells are removed by the separating return device 12 and a filter device 13 is introduced into a recovered ozone contact device 14. Further, iron/manganese water L mixed with the biologically treated water F which a fluidized introduced into a generated ozone contact device 26 through an iron removing device 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to water coloring and off-flavor substances such as diosmin, 2-methylisoborneol, iron and manganese ions, pesticides, trichlorethylene, 1-4 dioxane and dioxins (hereinafter referred to as pollutants. ) Including river / lake water, groundwater, human waste / sewage treatment plant discharge water,
Landfill seepage water and mixed water (hereinafter referred to as raw water)
The present invention relates to a water purifier that deodorizes, deodorizes, detoxifies, and sterilizes ozone by contacting it with ozone gas to stably supply safe and delicious water.

[0002]

2. Description of the Related Art FIG. 5 is a schematic explanatory view of the prior art, in which the coloring and off-flavor substances of water mainly derived from organisms such as cyanobacteria are decomposed by the oxidizing power of ozone using rivers and lakes as water sources. It is put to practical use in a water purification plant that purifies it. a is a dust remover,
A pretreatment device for raw water A, which is a combination of a biological treatment device, a coagulation sedimentation filtration device, etc., and b has a concentration of 20 to 30.
An ozonizer for generating ozone Y ₁ that generates g / Nm ³ .
c is an ozone contact reaction device having a water depth of about 5 m, which comprises a first tank d and a third tank f in which ozone gas and feed water are in countercurrent contact, and a second tank e and a fourth tank g in parallel flow contact A porous dispersion cylinder h having a hole diameter of 30 to 90 μm is provided at the bottom of each tank.

Further, the generated ozone gas Y ₁ derived from the ozonizer b is injected into the second tank e, the third tank f and the fourth tank g, and the recovered ozone gas Y ₂ released from the water surface thereof.
Are discharged from the gas reservoir space above these tanks, and the booster i
The pressure is increased by the air and is diffused into the first tank d, discharged from the water surface thereof, extracted from the gas reservoir space above the tank with a blower j, and sent as waste ozone gas Y ₃ to a waste ozone treatment device k filled with activated carbon and a catalyst. To be Incidentally, 1 is an ozone-treated water tank, m is a biological activated carbon device, and n is a water distribution tank into which a chlorine agent is injected. In the waste ozone treatment device, 1.000 to 2.000 ppm
Waste ozone gas Y ₃ was treated to be harmless at a cost of 2 to 0.2 yen per 1 m ³ .

The raw water A discharged from the pretreatment device a is supplied to the ozone contact reaction device c and comes into contact with the recovered ozone gas Y ₂ pressure-fed from the pressure boosting device i while flowing from the upper side to the lower side of the first tank d, Flowing through the submerged weir from below to above the second tank e, passing over the overflow weir, going through the third tank f from above to below, passing through the submerged weir and flowing from below to above the fourth tank g. Generated ozone gas Y ₁ supplied from the ozonizer b
When it is contacted with, the pollutant is oxidatively decomposed into a low molecular weight substance and easily biodegraded to be biooxidized in the biological activated carbon device m, sterilized with chlorine in the water distribution tank n, and supplied.

The absorption rate of the ozone contact reactor c generally reaches 90% when the water temperature is 15 ° C. and the injection rate is 2 mg / l, and the pretreatment water having a chromaticity of 20 to 30 degrees is 2 to 2. It is processed 4 times and the concentration derived from the first tank d is 1.000-
About 2.000ppm of waste ozone gas Y ₃ is waste ozone treatment equipment k
Although it must be detoxified with activated carbon or a catalyst filled in, it is easy to be oxidized by ozone because the substance to be treated is a coloring and off-flavor component mainly derived from algae. It was practically sufficient because of improved properties and biodegradability.

However, the recent large-scale development of mountainous areas and the accompanying destruction of the ecosystem due to deforestation, acid rain, etc. causes the water retention capacity of the forests to be lost, and the soil is washed away to contaminate the water source. Agricultural chemicals that not only take away the ability to purify nature but also show strong residual toxicity not only as eutrophication substances due to leakage and discharge of domestic wastewater from the development site, golf course runoff water, industrial waste landfill seepage water, etc. Contamination of water systems with organic halogen compounds such as trichlorethylene and dioxin, and bio-difficult chemicals such as plastics plasticizers has spread nationwide and their concentrations have increased sharply and become more serious, while water demand continues to increase. Not only does the downstream area of the river become like a discharge channel of the sewage treatment plant and the quality of water as a water intake source deteriorates, but In addition to dam construction in the area, it reduces the amount of river water in the middle basin, deprives it of its natural purification capacity, accelerates water pollution, infiltrates groundwater veins, and further reduces the area of green space and the impervious area in urban areas. The expansion has accelerated the vicious cycle of spurring water pollution, and is rapidly advancing complex and comprehensive pollution of water resources.

In order to stably supply safe water in such an aqueous environment, chlorine is added to a substance which is hardly biodegradable in the pretreatment step to oxidize and decompose it into low molecular weight substances, which is easily biodegradable and cohesive. However, it is necessary to improve ozone emission and reduce the ozone consumption by adsorption / coagulation separation removal with powdered activated carbon and coagulant, but in the situation where the content of pollutants increases, the increase of chlorine addition amount causes carcinogenic trihalomethane formation. Since the limit has already been reached in order to increase the amount, the amount of powdered activated carbon and the coagulant added must be increased to cover the operation cost, and the increasing rate of separation / removal rate is large. Therefore, in order to increase the purification efficiency, it was necessary to increase the absorption efficiency of the ozone contact reactor and the effective utilization efficiency of ozone.

However, in the conventional ozone contact reaction apparatus, generally, an ozone gas having a porous cylinder having a pore size of about 30 to 90 μm provided at the bottom of the contact tank and diffused into water by air blower pressure is used. As the bubbles in the one-pass flow are brought into contact with water, the pressure loss during ozone diffusing and the diffusing impact on ozone increase, increasing the ozone self-decomposition rate and increasing the contact tank water depth to the air blower allowable limit. The retention time of the bubbles is restricted to about 5 m from the pressure.
The moving distance cannot be extended, and the water stirring force that uniformly disperses the bubbles in water to increase the mass transfer rate is given only by the aeration effect of ozone gas, and therefore the diffused gas capacity is reduced and the ozone concentration is increased. Gas-liquid flow ratio (hereinafter G /
There is a problem that it is difficult to raise the ozone absorption reaction efficiency and the effective utilization efficiency because it is not possible to exert the effect of promoting the concentration difference while lowering the L ratio).

Further, since the bubbles of ozone gas diffused from the bottom of the contact tank into the water are separated by the ascending one-pass flow, the residence time and movement distance in water are shortened, so that the ozone absorption rate and effective utilization efficiency are improved. In order to raise and maintain / improve the purification / water purification capacity, it is necessary to reduce the load on the waste ozone treatment device by arranging the contact tanks in multiple stages in series and collecting / pressurizing exhaust ozone for reuse. As a result, equipment construction costs and operating costs became excessive, and the required site area increased, making it difficult to remodel existing equipment and construct in areas with high land prices, making it impossible to expand the applicable fields.

[0010]

The problem to be solved by the present invention is that the water depth of the contact tank is shallow, the air diffusion resistance is strong, the amount of air diffused cannot be reduced, and it is difficult to improve the absorption efficiency. In order to improve the contact reaction efficiency and effective utilization efficiency of ozone, the contact tanks must be arranged in multiple stages in series, and since the concentration and gas amount of waste ozone are large, the recovery booster and the waste ozone treatment device are This is not only because the equipment becomes large and construction costs and operating costs become excessive due to the necessity, but also the required site area becomes large and the applicable fields are limited.

[0011]

DISCLOSURE OF THE INVENTION The present invention for solving the above-mentioned problems is directed to a water purifier for contacting and purifying water to be treated containing pollutants with ozone gas. A gas-liquid contactor provided with a deep well-shaped water channel having a water depth of 8 m or more and a gas dome covering the water channel is provided, and the water to be treated supplied through the downcomer pipe is supplied to the water channel. Water is pumped up in the ascending pipe section, and every 1 second in the descending pipe.
A pumping means for giving a high-speed downward precipitation flow of about m to 2 m and an aeration means for injecting ozone gas into the descending water flow are attached, and the ozone gas separated from the water in the ascending pipe is led to the gas dome. A water purifier characterized by having a distributor attached.

Further, in a water purifying apparatus for contacting and purifying water to be treated containing pollutants with ozone gas, a deep well-like circulating water channel having a descending pipe and an ascending pipe communicating with each other at an upper portion and a lower portion and having a water depth of 8 m or more. And a waste ozone contacting device provided with a head tank for discharging diluted ozone gas into the atmosphere, and the treated water supplied to the circulating water channel through the downcomer pipe is pumped up through the upcomer pipe. And 1m / s in the downcomer
The water purification apparatus is characterized by further comprising a pumping means for giving a high-speed downward precipitation flow of 2 to 2 m, an aeration means for injecting waste ozone gas into the descending water flow, and a biological carrier for implanting microorganisms.

Further, the gas-liquid contacting device is arranged in front of the generated ozone contacting device for contacting the water to be treated with the generated ozone gas supplied from the ozonizer, and is led out from the generating ozone contacting device. And a recovery ozone contacting device for contacting the recovered ozone gas with the water to be treated, and an air guide pipe for guiding the waste ozone gas derived from the recovery ozone contacting device to the aeration means of the waste ozone contacting device. The water purification apparatus is characterized in that a water channel section of a gas-liquid contact apparatus section between the generated ozone contact apparatus and the recovered ozone contact apparatus is installed in the circulating water channel of the waste ozone treatment apparatus.

[0014]

FIG. 1 is a system diagram showing an embodiment of the present invention,
A description will be given based on FIG. 2 showing a cross-sectional view of the circulating water channel portion of the waste ozone contacting device portion of FIG. Reference numeral 1 is a pretreatment apparatus for raw water A'composed of an appropriate combination of a dust remover, a sand basin, a filtration apparatus and / or a pre-chlorination apparatus, 2 is a waste ozone contact apparatus, 1
2 is a device for separating and returning a liquid biological carrier, 13 is a filtering device, 1
Reference numeral 4 is a recovered ozone contact device, 25 is an iron removing device, 26 is a generated ozone contact device, 36 is a biological activated carbon device, and 37 is a water distribution device provided with a chlorine mixer (not shown). 4
Reference numeral 0 is an ozonizer that generates ozone gas (hereinafter referred to as generated ozone) V having a concentration of 30 to 120 g / Nm ³ .

The waste ozone contacting device 2 is mainly included in the pretreated water C discharged from the pretreatment device 1 by contacting the ozone gas (hereinafter referred to as waste ozone) X discharged from the recovered ozone contacting device 14. Oxygen is supplied to a fluid biological carrier and a fixed biological carrier 10 not shown, and organic substances and ammonia nitrogen in pollutants are bio-oxidized / decomposed and fixed / separated into cells, and converted to nitrate nitrogen, and the ozone concentration is 0 .
It is characterized by being diluted to less than 1ppm and released into the atmosphere. It is also characterized by acclimatizing and implanting microorganisms mainly composed of bacteria resistant to dilute ozone such as photosynthetic bacteria as a biological carrier.

Reference numeral 4 is an ascending pipe having a water depth of 8 m or more, preferably 50 to 100 m or more, which is provided with an air diffuser nozzle 7 having a hole diameter of 1 mm or more for blowing the compressed air T upward and pumping it by the air lift effect. The aeration nozzle 7 is 3 m below the water surface, preferably 1/1 of the water depth when the water depth is 30 m or more.
It is provided below the water surface of about 0. 3 is a downcomer which is installed in the ascending pipe 4 to form a double-piped circulation channel, and 5 is a trapping return device 6 which limits and traps the overflow of the liquid biological carrier and returns it to the downcomer 3 and mainly the activity. Fixed biological carrier 10 on which sludge is implanted
A submerged head tank 8 is an injection device that blows the waste ozone X downward below the water surface of the downcomer pipe 3 while sucking the waste ozone X with the compressed air T flowing in the ejector. In addition, 9 is an air diffuser, the tip of which is an air diffuser 7
It is provided at a position deeper than the mounting position of. Also,
Reference numeral 11 is a water supply pipe for supplying the pretreated water C below the water surface of the downcomer pipe 3. In addition, B is a sludge component, D is an arrow showing a descending water flow, and E is an arrow showing an ascending water flow.

The separating / returning device 12 is provided with a not-shown returning pump for solid-liquid separating the fluid biological carrier overflowing the trapping / returning device 6 from the biologically treated water F and returning it under the water surface of the downcomer pipe 3. Further, the filtering device 13 mainly filters and separates exfoliated bacterial cells that have fallen off the surface of the biological carrier, and is provided with an automatic backwashing device (not shown). In addition, G is a biological carrier returned, H
Is the backwash drainage of exfoliated cells.

The recovered ozone contact device 14 contacts the biologically treated water F with ozone gas (hereinafter referred to as recovered ozone) W derived from the generated ozone contact device 26 and generated ozone V appropriately supplied from the ozonizer 40. Dissolution
It oxidizes and insolubilizes the remaining iron and manganese components and oxidizes and decomposes the readily-decomposable ozone components in the remaining bio-degradable components, and 15 and 16 each have a water depth of 8 m or more, preferably 30 to 100 m. The descending pipe and the ascending pipe that form the U-shaped water passage. Reference numeral 18 is a distributor attached to the gas dome 17 and is led out while adjusting the pressure thereof. Reference numeral 19 is 3 m below the water surface of the rising pipe 16, preferably 1/10 below the water surface when the water depth is 30 to 100 m. The injection device is provided with an air diffuser nozzle 20 having a hole diameter of 1 mm or more, and the waste ozone gas X sucked by the compressed air T flowing in the ejector is blown upward to pump water by the air lift effect to form a water flow. 21
Is an injection device that blows the recovered ozone W and the generated ozone V, which are sucked into the compressed air T flowing through the ejector, downward from below the water surface of the downcomer pipe 15 through the air supply pipe 22, and the tip of the air supply pipe 22 is The diffusing nozzle 20 is inserted at a position equal to or preferably deeper than the mounting depth of the aeration nozzle 20 by about 0.5 to 2 m. 23 is a downcomer pipe 15 for biologically treated water F
Supply pipe for supplying water below the water surface, and 24 is recovered ozone-treated water K
This is the overflow basin. In addition, I is an arrow indicating a descending water flow, J
Is an arrow indicating a rising water flow.

The generated ozone contact device 26 oxidizes the ozone decomposable substance remaining in the iron removal / manganese water L derived from the iron removal device 25 by contacting the generated ozone V with a concentration of 30 to 120 g / Nm ^3. 27 and 28 are those that decompose to lower the molecular weight and biodegrade easily, and 27 and 28 are a downcomer pipe and an ascending pipe that form a U-shaped waterway with a water depth of 8 m or more, preferably about 30 to 100 m, and 30 is a gas. A distributor that distributes while adjusting the pressure of the dome 29, 31 is a diffusing nozzle with a hole diameter of more than 1 mm for blowing the generated ozone V downward to a depth of about 1 m below the water surface of the downcomer 27, and 32 is iron removal A water supply pipe for supplying the manganese water L below the surface of the downcomer pipe 27, 34 pumps up the ozonated water O generated in the ascend pipe 28 and partially returns it from the return water pipe 35 to below the water surface of the downcomer pipe 27. Bioactive carbon device Pumping pump 33 that forms a water flow while supplying it to 36, and 33 is an overflow basin. In addition, M is an arrow showing a descending water flow, N is an arrow showing an ascending water flow, and P is purified water.

The ozonizer 40 has an oxygen generator 39 for concentrating the oxygen in the compressed air T to a concentration of about 90%, an ozone concentration, an amount and a distribution rate of the ozone generated by the ozonizer 40 according to the state of the raw water, and the oxygen generator 39. Oxygen generation and distributor 3
A generated ozone controller 41 (not shown) for controlling the amount of recovered ozone W to be returned from 0 to the ozonizer 40 is provided. Further, 38 is an air compression device. In addition, S is air, U is concentrated oxygen, and Y is a purge gas at the time of molecular sieve regeneration of the oxygen generator 39.

The operation will be described below. Pretreatment device 1
The sludge component B is removed from the raw water A and the pretreated water C introduced into the waste ozone contactor 2 is supplied into the downward precipitation flow D at a speed of about 1.0 to 2.0 m / s accompanied by the liquid biological carrier and injected. With the waste ozone X injected from the device 9 while being sucked into the compressed air T, the descending pipe 3 descends, reaches the bottom, and reverses to the ascending pipe 4 to become an ascending water flow E at a speed of about 0.5 to 1.5 m / sec. In the meantime, while flowing over the capture and return device 6 of the fluid biological carrier and part of the fluid biological carrier is returned to the downcomer pipe 3 and circulates, it comes into contact with the fluid biological carrier and the fixed biological carrier of the head tank 5 and is a biodegradable pollutant. Is removed by bio-oxidation / decomposition and cell immobilization, and part is separated and returned by the device 1
It is pulled out to 2. Further, the circulating flow is formed and maintained by the pumping force by the air lift effect of the compressed air T injected from the diffuser nozzle 7 below the water surface of the rising pipe 4.

The amount of gas injected into the water from the diffuser nozzle 7 and the air supply pipe 9 is about 0.5 to 0.7 and about 0.3 to 0.5 in terms of G / L ratio with respect to the amount of the pretreated water C introduced, and the liquid retention time. Is about 30 to 90 minutes on average, and waste ozone X
Is consumed in the process of oxidizing and decomposing pollutants and is diluted with injected air to a concentration of 0.1 ppm or less and released from the water surface of the head tank 5 to the atmosphere. The purge gas Y from the oxygen generator 39 is mainly abolished. The diluted gas of ozone X is appropriately supplied to the air diffusion nozzle 7.

The biologically treated water F from which the fluid biological carrier and the detached bacterial cells have been separated and removed by the separation and return device 12 and the filtration device 13 is in the recovered ozone contact device 14 in the downward precipitation flow I at a speed of about 1.0 to 2.0 m / s. And the injection device 2
Along with the recovered ozone W sucked and injected into the compressed air T flowing in the ejector No. 1 and the generated ozone V mixed appropriately, the downcomer pipe 15 is descended and inverted to the upcomer pipe 16 at the bottom portion, and it is 0.
The iron and manganese dissolved in the biologically treated water F are oxidized and insolubilized while partly flowing up into the rising water flow J at a speed of 5 to 1.5 m and partly returning to the downcomer pipe 15 and circulating. It is extracted from 24 to the iron removing device 25. Further, the circulating water flow is formed by the pumping force by the air lift effect of the mixed gas of waste ozone X and air that is sucked by the compressed air T flowing in the ejector of the injection device 19 and injected from the diffuser nozzle 20 into the water of the rising pipe 16.・ Maintained.

The injection devices 19 and 21
The amount of gas injected from the water into the water is about 0.08 to 0.1 and 0.05 to 0.07 in terms of G / L ratio with respect to the amount of the biologically treated water F introduced.
The liquid retention time is about 2 to 10 minutes on average.

Ozone contacting device 26 generated from iron removing device 25
The iron-removing / manganese water L introduced into the pipe is supplied to the downward precipitation flow M at a speed of 1.0 to 2.0 m / s, and the generated ozone V injected from the aeration nozzle 31 descends the downcomer pipe 27 and rises at the bottom 28. It becomes the rising water flow N at a speed of 0.5 to 1.5 m / s and is pumped up from the overflow basin 33 by the pumping pump 34, and part of it is returned to the downcomer pipe 27 and oxidatively decomposes ozone decomposable substances during circulation. Then, it is reduced in molecular weight and biodegradable, and a part is transferred to the biological activated carbon device 36. In addition, the water flow is formed and maintained by the pumping power of the pump 34. The amount of gas injected from the aeration nozzle 31 below the water surface is about 0.01 to 0.02 in terms of G / L ratio with respect to the amount of iron removal / manganese water L introduced, and the liquid retention time is about 2 to 10 minutes. When the iron and manganese contents in the raw water A are low or when it is not necessary to remove the recovered ozone treated water K, the recovered ozone treated water K bypasses the iron removing device 25 and is introduced into the generated ozone contact device 26.

The amount of treated water, the quality of raw water and the quality of treated water,
The size of the canal, the average liquid retention time, and the water flow velocity are determined by the properties of the pollutants, and especially the depth of the canal is restricted by the underground conditions of the installation site, but it will be installed along the structure. In some cases, the height of the building is constrained, and the diameter of the water channel is determined in consideration of its water depth.

Further, the descending water streams D, I, M must descend at a velocity of about 0.3 m while holding down the bubbles of ozone which are about to rise, so that a velocity of at least about 1 m is required and a faster velocity is preferable. However, as for the rising water flows E, J, N, it is preferable that the residence time of the bubbles in the liquid is longer, so that it is generally equal to or less than that of the descending water flows D, I, M, that is, crossing the rising pipes 4, 16, 28. Each of the areas occupied by the flowing water portion in the area is set to be larger than the area of the downcomers 3, 15, 27. The water flow in the waste ozone contact device 2 and the recovered ozone contact device 14 is represented by the bubble volume occupied in the descending water flows D and I and the ascending water flows E and J, that is, the ratio of air / water that changes with respect to the water depth. The porosity is given by increasing the rising water flows E and J, and the speed of the water flow is controlled by adjusting the difference, and the water flow in the generated ozone contact device 26 mainly raises the water level in the downcomer pipe 27. It is controlled by adjusting the height of the overflow weir of the overflow basin 34, which is given by the head by raising the water level above 28, and the pumping and returning quantities of the pumping pump 34. In addition,
The downcomers 15, 27 and the upcomers 16, 28 are installed in the circulating water circuit of the waste ozone contactor 2.

The generated ozone-treated water O introduced into the biological activated carbon device 36 has biodegradable pollutants contained therein adsorbed and filtered by the activated carbon and decomposed and purified by bacteria living on its surface. Environmental mutagenic substances such as trihalomethane precursors are removed, and water tank 37
The safe purified water P is sterilized by chlorine and is supplied stably. The water purification apparatus of this embodiment is suitable for treating raw water containing a large amount of pollutants that are relatively easily biooxidized. Further, the description of the operation is omitted in the following embodiments.

Another embodiment of the present invention will be described with reference to FIG. 3 which is a system diagram and FIG. 4 which is a transverse sectional view of a circulating water channel portion of the waste ozone contactor section of FIG. 44 is a water supply pump 4
A double tubular recovery ozone contactor into which the pretreated water C pressurized at 2 is introduced, 45 is a downcomer, 46 is an upcomer,
Reference numeral 47 is a gas dome provided with a distributor 48. Reference numeral 43 is an injection device that sucks the recovered ozone W and the generated ozone V into the pretreated water under pressure flowing in the ejector while supplying them below the water surface of the downcomer pipe 45. While sucking ozone X into the compressed air T flowing through the ejector, the hole diameter is 1mm
It is an injection device that injects upward from the air diffuser nozzle 51. In addition, 50 is an air supply water pipe, 52 is an iron removal apparatus.

Reference numeral 53 denotes a double tubular waste ozone contacting device, which makes the easily biodegradable substance and ammonia contained in the iron removal / manganese water derived from the iron removal device 52 contact the fixed biological carrier 57 to perform biological oxidation.・ Decompose, fix / separate cells, or perform nitrification and reduce ozone in the released gas to 0.1 ppm or less. Reference numeral 54 is a downcomer pipe, 55 is an upcomer pipe, and 56 is a head tank in which a fixed biological carrier 57 is installed. Reference numeral 58 denotes an injection device, which is a compressed air T flowing in the ejector.
The waste ozone X is sucked into and is supplied from the air supply pipe 59 to below the water surface of the downcomer pipe 54. Reference numeral 60 denotes an air diffuser nozzle having a hole diameter larger than 1 mm for injecting the compressed air T upwardly below the water surface of the rising pipe 55. Reference numeral 61 is a water supply pipe for supplying iron removal / manganese water below the water surface of the downcomer pipe 54. The tip of the air supply pipe 59 is inserted at a position deeper than the mounting depth of the air diffusion nozzle 60.

Further, 62 is a filter device filled with sand and provided with an automatic backwash device (not shown), 64 is a denitrification device provided with an automatic backwash device (not shown), and 65 is pressurized by the pump 34. It is an injection device for injecting the return water of the waste ozone-treated water O into the ejector to inject the recovered ozone W into the liquid in the downcomer pipe 27 while sucking the recovered ozone W. 63 is a filtering device 6
2 is a return water pump that sends the backwash water of the denitrification device 64 to the downcomer pipe 54 of the waste ozone contact device 53. Q is denitrification backwash drainage, and R is denitrification treated water. The water purification apparatus of this embodiment is suitable for treating raw water containing ammonia and a pollutant which is relatively bio-degradable and easily decomposed by ozone. Figure 1 above
4 to 4, the same parts are designated by the same reference numerals.

The present invention is not limited to the above-mentioned embodiment, and the double tubular water passages of the waste ozone contactor 2, 53 and the recovered ozone contactor 44 are connected to the U-shaped water passage or the recovered ozone contact reaction. U of the device 14 and the generated ozone contact device 26
The water channel having a character shape may be replaced with a double tubular water channel, an emergency waste ozone treatment device may be provided, a booster device for the waste ozone X may be provided, and the injection device 19, 49.
May be replaced by a pumping pump, the oxygen generator 39 may be replaced by a pure oxygen supply device, and the air supply pipes 9, 22, 59 and the air supply water pipe 50 may be provided with a diffuser nozzle having a large hole diameter. The filtration device incorporated in the processing device 1 may be replaced with a coagulation filtration device, and the filtration devices 13 and 62 may be those in which a plurality of layers of sand, zeolite, activated carbon, or the like are packed, or a coagulation filtration device. The water depth of the ozone contactors 2, 53, the recovered ozone contactors 14, 44, and the generated ozone contactor 26 may be 100 m or more, and it is needless to say that various changes can be made without departing from the scope of the present invention. is there.

[0033]

Ozone is an excellent oxidant having a strong oxidative power, but it is not only more expensive than other oxidants due to the extremely low power consumption efficiency required for ozone generation, but also for about half a day. About half of it self-decomposes in the state of being left to stand naturally and returns to ineffective oxygen, so the storage stability is poor, and its self-decomposition rate increases as the mechanical shock received during pressurization and air diffusion and the vapor ozone concentration increase, It is difficult to dissolve in, and it is 0.
It is a very harmful substance even with a trace amount of ozone gas of 1 to 0.3 ppm.

In order to bring ozone gas having such characteristics into contact with water containing a biodegradable pollutant to purify it, a harmful substance generated by excess or deficiency reaction, for example, permanganic acid to be redissolved or coloring matter It is necessary to suppress the ozone loss, which is a strong ozonide compound or conversely oxone, which is more toxic than the original thiones, or is consumed in large amounts in the mineralization reaction of the reforming substance. Can be injected with ozone without mechanical shock, and within a short period of time, it becomes a fine bubble that enlarges the gas-liquid interface area, and the bubbles are vigorously stirred and mixed in the liquid to uniformly disperse the substance and increase the mass transfer rate. It is possible to increase the residence time of the fine air bubbles in the liquid, and to adjust the air bubbles at any time, so that mutually opposing conditions such as ozone can be collectively collected so as not to structurally interfere with each other. Effective use efficiency of A contact device of the gas phase ozone can increase the absorption reaction efficiency and purification treatment system was required.

Since the solubility of gas-phase ozone in the liquid phase complies with Henry's law, the gas-phase ozone dissolution rate / absorption rate of the contact device for oxidative decomposition and purification treatment of pollutants that are hardly biodegradable is mainly affected by water pressure. I know that The relationship was verified by the method shown in "Flow Sheet of Absorption Rate Experimental Device in Vertical Circulation Channel" in Table 1 below, and an example thereof is shown in "Ozone Absorption Rate and Depth of Vertical Circulation Channel and Gas-Liquid Flow Rate" in Table 2 below. Ratio (G / L
Ratio) ”.

[0036]

[Table 1]

[0037]

[Table 2]

According to the method of Table 1, the water depth z of the downcomer pipe 73 of the ozone contactor 72 is set as the depth of the vertical circulation channel along the building and assembled to 5 m to 50 m, and the downflow 73 of the downcomer pipe 73 is The coagulation-sedimentation-filtered treated water of swamp water having a water temperature of 20 ° C was used as sample water o and the concentration generated by the ozonizer 70 was 3
The absorption rate was measured by supplying and contacting with 0 g / Nm ³ of generated ozone v. 71 is a water supply pipe for sample water o, 74
Is an ascending pipe, 75 is a diffusing nozzle with a hole diameter of 1 mm attached 1 m below the water surface of the descending pipe 73, and 76 is an ascending water flow t to a cylindrical gas-liquid separator 77 with a baffle plate 78 attached. A connecting pipe introduced in the tangential direction, 79 is a pressure regulating valve for eliminating the discharged ozone w, and 80 is a part of the ozone contact water p returned to the descending water flow s as return water q and a part thereof is discharged water r to the drain tank 82. A pumping pump for supply, 81 is a return pipe for the return water q.
Further, u is air. Note that the descending water flow s and the ascending water flow t
Was set to 1 m / s.

In Table 2, the absorption rate is defined as the concentration of generated ozone v as the injected ozone concentration x, and the concentration of the discharged ozone w removed from the pressure regulating valve 79 as the waste ozone concentration y, which is 1- (of the vapor phase ozone standard). It is represented by y / x). Also,
The gas-liquid flow rate ratio (G / L ratio) is a value in which the supply amount of sample water o is the denominator and the amount of injected ozone having a concentration x is the numerator.

According to Table 2 above, the absorption rate increases as the depth of the vertical circulation water channel increases and increases as the G / L ratio decreases, and in particular, the depth of the vertical circulation water channel reaches from 5 m to 8 m. It is shown that the absorption curve rises sharply during the period. When the water depth is 50 m and the G / L ratio is 0.05, an absorptivity of 95% or more is recorded. At this time, the odor concentration and chromaticity of the discharged water r are the odor concentration TO50 to 60 and the color of the sample water o. To 3 to 5 and chromaticity to 3 to 25 to 30 degrees
Although 4 degrees was obtained, since the subject of the present invention is the mounting method of the gas phase absorption system, the description of the verification of the liquid phase reaction system is omitted.

[0041]

【The invention's effect】

(1) The step ozonation system provided with a waste ozone contact device, a recovery ozone contact device, and a generation ozone contact device improves the cohesiveness and biodegradability by gradually reducing the molecular weight and modifying the pollutants. And since it is removed stepwise, it is possible to suppress the generation of harmful excess and deficiency reaction substances and the mineralization reaction of the reforming substances, and it is possible to greatly reduce the generation of purification dysfunction and ozone loss. Effective use efficiency is improved. (2) Since a water channel having a depth of 8 m or more is provided in each of the downcomer pipes of the waste ozone contact device, the recovered ozone contact device, and the generated ozone contact device, a descending flow at a speed of about 1 to 2 m / s is formed. , The ozone gas injected into the descending water stream is made into fine bubbles and uniformly dispersed in a short time due to the strong stirring force in the turbulent region, and is given a hydrostatic pressure that increases as it descends. Aeration gas content can be saved and the capacity and concentration can be reduced to reduce electricity consumption for ozone generation, concentration difference promotion effect and G / L
Not only can the absorption ratio be significantly improved by the reduction of the ratio, but the volume and diameter of the air diffuser nozzle can also be reduced, and the pressure loss, the required air pressure, and the air impact force can be greatly reduced. Measured to reduce the ozone self-decomposition rate, improve effective utilization efficiency and energy saving, and increase the gas-liquid interface area.
By improving the absorption reaction efficiency by shortening the mass transfer rate, shortening the liquid retention time, and speeding up the process, the device can be downsized, and the clogging of the diffuser nozzle and the mechanical booster of the recovered ozone, etc. Since there are no outages due to rotating equipment, maintenance can be done easily and long-term continuous stable operation is possible, ensuring a stable supply of safe water. (3) A waste ozone contact device equipped with a biological carrier is provided to purify the pollutants by bio-oxidation / decomposition and cell fixation, and at the same time, the waste ozone can be detoxified by erasing / diluting it. The processing device can be omitted, and the operating cost can be greatly reduced. (4) Since the water channel part of the gas-liquid contact device part between the recovered ozone contact device and the generated ozone contact device is installed in the circulation channel of the waste ozone contact device, the required site area can be greatly reduced,
Not only the piping for gas and liquid is greatly shortened, but also the piping resistance is reduced to reduce the pressurizing energy of ozone gas and the amount of self-decomposition, and the number of drilling wells, the volume of soil and the construction period are shortened. Not only can the construction cost be significantly reduced due to the fact that it can be measured, but also the required site area can be significantly reduced, and it is possible to install it in existing equipment or construct it in a narrow place or in a building, expanding the applicable fields. .

[Brief description of drawings]

FIG. 1 is a system diagram according to an embodiment of the present invention.

FIG. 2 is a horizontal cross-sectional view of the circulating water channel portion of the waste ozone contactor portion of FIG.

FIG. 3 is a system diagram according to another embodiment of the present invention.

FIG. 4 is a horizontal cross-sectional view of a circulating water channel portion of the waste ozone contact device portion of FIG.

FIG. 5 is a schematic explanatory diagram according to a conventional technique.

[Explanation of symbols]

1 Pretreatment device 2,53 Waste ozone contact device 3,15,27,45,54 Downcomer 4,16,28,46,55 Upcomer 5,56 Head tank 6 Capture and return device 7,20,31,51, 60 Aeration nozzle 8, 19, 21, 43, 49, 58, 65 Injection device 10, 57 Fixed biological carrier 14, 44 Recovery ozone contact device 17, 29, 47 Gas dome 18, 30, 48 Distributor 24, 33 Over Flow basin 26 Ozone contacting device 34 Pumping pump 36 Biological activated carbon device 39 Oxygen generator 40 Ozonizer 42 Water supply pump 64 Denitrification device a Pretreatment device b Ozonizer c Ozone contacting device d 1st tank e 2nd tank f 3rd tank g 4th tank h Scattering cylinder i Booster device j Blower k Waste ozone treatment device l Treated water tank m Bio-activated carbon device n Water distribution tank A Raw water B Sludge Ingredient C Pretreated water D Precipitating water flow E Ascending water flow F Biologically treated water G Returning biological carrier H Stripping bacteria backwash drainage I Precipitating water flow J Ascending water flow K Recovered ozone-treated water L Demineralization / manganese water M Precipitation water flow N O Ascending water flow O Generated ozone treated water P Purified water Q Denitrification backwash drainage R Denitrifying treated water S Air T Compressed air U Concentrated oxygen V Generated ozone W Recovered ozone X Waste ozone Y ₁ Generated ozone gas Y ₂ Recovered ozone gas Y ₃ Waste ozone gas

Claims (3)

[Claims] 1. A water purification apparatus for purifying ozone by contacting water to be treated containing pollutants with a deep well channel having a water depth of 8 m or more, which is composed of a downcomer and an ascending pipe communicating with each other at an upper portion and a lower portion. A gas-liquid contact device provided with a gas dome covering the water channel is provided, and the water to be treated supplied to the water channel from the downcomer pipe section is pumped up by the upcomer tube section and rapidly descended into the downcomer tube. A pumping means for giving a water flow and an injecting means for injecting ozone gas into the descending water flow, and a distributor for discharging the ozone gas separated from the water in the ascending pipe is attached to the gas dome. Water purifier to do. 2. A water purification apparatus for purifying ozone by contacting water to be treated containing pollutants with a deep well-like circulating water channel having a descending pipe and an ascending pipe communicating with each other at an upper portion and a lower portion and having a water depth of 8 m or more. And a waste ozone contacting device provided with a head tank for discharging diluted ozone gas into the atmosphere, and the treated water supplied to the circulating water channel through the downcomer pipe is pumped up through the upcomer pipe. Then, a water purifying device provided with a pumping means for giving a high-speed downward precipitation flow in the descending pipe, an injecting means for injecting waste ozone gas into the descending water flow, and a biological carrier for implanting microorganisms. 3. The water purification apparatus according to claim 1 or 2, wherein the gas-liquid contacting device brings the generated ozone gas supplied from the ozonizer into contact with the water to be treated, and the generated ozone contacting device. Waste ozone gas, which is disposed in the preceding stage and is incorporated into each of the recovery ozone contact devices for contacting the treated ozone with the recovered ozone gas derived from the generated ozone contact device, and the waste ozone gas derived from the recovered ozone contact device is contacted with the waste ozone An air guide pipe leading to an air injection means of the device is provided, and a water passage part of a gas-liquid contact device portion between the generated ozone contact device and the recovered ozone contact device is provided in a circulation water passage of the waste ozone contact device. The water purifier according to claim 1 or 2, wherein