JPH0121040Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a water purification device, and more specifically, it uses microorganisms in pond water, etc. (hereinafter referred to as wastewater/sewage) under aerobic conditions. This invention relates to a water purification device for wastewater and sewage that uses biological treatment to purify water.

[Conventional technology]

Traditionally, water purification systems based on the biological treatment of wastewater and sewage have been designed to constantly circulate floc-like biological growth bodies and to bring these biological growth bodies into contact with organic wastewater and sewage under aerobic conditions. A device using the activated sludge method that treats wastewater and sewage by disposing of a filling material layer in the treatment tank, forming a microbial film on the surface of the filling material, and discharging the wastewater and sewage onto the microbial film. Devices using the biofilm method that treat wastewater and sewage by bringing them into contact with each other are known (see ``Biological Treatment of Wastewater,'' translated by Shigehisa Iwai, published by Corona Publishing, etc.).

The activated sludge method includes a standard activated sludge method, a dispersion growth aeration method, a contact stabilization method, a staged aeration method, etc., which are selected and used in consideration of the amount of wastewater/sewage to be treated and other factors. However, in the case of this activated sludge method, a large amount of activated sludge is generally required, and this activated sludge may flow out together with the treated water, worsening the quality of the treated water. There is a problem in that it becomes necessary to increase the size.

Biofilm methods include trickling filter method, rotating disk method,
There are catalytic oxidation methods, etc., and like the activated sludge method mentioned above, they are selected and used in consideration of installation conditions and other factors. However, in the case of this biofilm method, the treatment capacity is low because the microbial film area per treatment is small, and as with the activated sludge method mentioned above, the microbial film leaks into the treated water and deteriorates the quality of the treated water. There is also.

Therefore, as a solution to this problem, as shown in FIG. In order from the top, a filler layer 8, a mixed filler layer of filler and solid particles, and a support layer 5.
, a treated water collection device 21 and an air intake port 22 are provided on the lower side of the support layer 5, and the filler is made of particles having a sufficiently larger particle size than the solid particles. (Unexamined Japanese Patent Publication 1983-
114792), and a water purification device that improves the water purification efficiency by disposing a coarse-grained filter material before a fine-grained filter material inside the treatment layer (Japanese Patent Application Laid-open No. 134453/1983). (see official bulletin) has been proposed.
These water purification devices have the advantage of being able to solve the above-mentioned problems.

However, in these water purification devices, wastewater and sewage are passed through a filler layer from the wastewater and sewage inlet located at the top of the treatment tank and purified by microorganisms, and the treated water is discharged from the treated water outlet located at the bottom. Since the treatment tank is designed to discharge water, its water purification capacity varies depending on the height of the treatment tank.In order to improve the water treatment capacity, the height of the treatment tank must be lengthened to increase the area for microbial growth. There is a need to. However,
If the height of the treatment tank is increased in order to increase the area for microbial growth, problems have been raised in that not only does the treatment tank itself become larger, but it is also less favorable in terms of workability.

In addition, water purification is provided in which a plurality of filler layers are installed in parallel in the horizontal direction, and the water to be treated is circulated within the filler layer along a partition wall to separate the filler layers. A device (see Japanese Unexamined Patent Publication No. 48-35667) is also known. And for this configuration,
It can be said that this method has the advantage that the above-mentioned problem can be eliminated.

[Problem that the invention attempts to solve]

However, in the case of these water purification devices, before sending the water to be treated into the filling material layer, the filling material layer is made to be under aerobic conditions beforehand. In addition, air is sent into the filler layer into which the water to be treated is fed, and the water is purified through biological treatment, which causes the following problems. In other words, the explosive state of the water to be treated is not good.

The air supply equipment for bringing the filler layer under aerobic conditions is complicated.

Furthermore, since the treated water after purification is simply clean water, if the treated water is to be recirculated to a pond or the like, a separate detonation device such as a pond is required.

The present invention was devised in response to the above-mentioned problems, and its purpose is to ensure that air is sufficiently mixed when the water to be treated is fed to the filling material layer. It is an object of the present invention to provide a water purification device for wastewater and sewage in which the water to be treated is in a treated state, the biological water purification efficiency by the filler layer is increased, and the treatment tank itself can be downsized.

(Means for Solving the Problems) The water purification device of the present invention as a means for achieving the above object is a water purification device for purifying water to be treated such as wastewater and sewage. A support member having a plurality of water passage holes is arranged in the lower part of the water purification treatment tank, and a plurality of partition walls are erected on the upper surface of the support member, and a gap between the partition wall and the inner wall of the treatment tank is provided. and a filler layer in which microorganisms live between adjacent partition walls. A filter layer finer than the filler layer is disposed after the layer, and a hydrated layer made of crushed limestone or the like is disposed between the filler layer and the filtration layer or after the filter layer. , the water to be treated is circulated around the filling material layer, the filtration layer, and the water hydration layer to be treated along the partition wall, and further, the water to be treated is supplied to a portion before the filling material layer by a pump for supplying the water to be treated. A to-be-treated water inlet pipe for forcibly supplying treated water is installed, and in the middle of the to-be-treated water inlet pipe there is air suction piping that is sucked in by the water flow of the to-be-treated water passing through the to-be-treated water inlet pipe. is arranged so that the treated water atomized by suction air in the treated water inlet pipe can be sent to the above-mentioned filler layer, and the latter stage of the above-mentioned filtration layer, or the latter stage of the filtration layer. If a water hydration layer to be treated is arranged in the water hydration layer to be treated, then
A treated water discharge pipe is provided for discharging treated water obtained by purification through a filler layer, a filtration layer, and a hydration layer of treated water, and the treated water is activated in the middle of the treated water discharge pipe. In addition, an air supply section for supplying oxygen is provided, and a sludge accumulation section is provided below the support material.

Here, in the above configuration, microorganisms such as bacteria, yeast, fungi, protozoa, rotifers, worms, and insect larvae are generally used. Bacteria are mainly non-nitrifying aerobic spore-forming bacteria, most of which are Bacillus subtilis. However, in general, one consisting of aggregations of many of these types is used. In addition, as the filler forming the filler layer, that is, the material to which microorganisms adhere, it is possible to use fillers having various shapes such as oxchilling, shishing, pipe, spherical, or lattice shapes, and made of various materials. can. It may be of irregular shape or irregular shape. It may also be sand, anthracite, slag, plastic particles, etc.

Further, although the partition wall is generally made of a plastic plate, has a shape having uneven parts, etc., it is not limited thereto, and other shapes may be used. Further, as the filter material layer, the same filler as that forming the filler layer described above can be used. just,
Generally, a material with finer grains than the filler layer is selected and used. Furthermore, the hydrated layer to be treated is formed by placing crushed limestone or the like in a mesh bag.

[Effect]

Next, a water purification device of the present invention based on the above configuration will be explained.

First, wastewater/sewage containing organic components including BOD components, nitrogen components, phosphorus components, and other components is forcibly fed into the treatment tank from a pond etc. using a pump for supplying treated water. With the ejector action of the water flow of the water to be treated by the pump, air is sucked under negative pressure through the air suction pipe to mix air into the water to be treated, and then the air-containing water to be treated is sent into the treatment tank; The filling material layer enables circulating water to be purified.

The water to be treated that is sent to the filler layer is
The air contained in the packing material layer is in an aerobic atmosphere, and the first layer of the multi-layered packing material layer is passed along the partition wall, and the second, third, and so on are sequentially circulated through the layers. During the circulation process, BOD components etc. come into contact with microorganisms and are accumulated and multiplied within the cells of microorganisms as a food source. A part of the removed BOD components etc. is synthesized and becomes new cell material, and the remaining The BOD components and the like that circulate through the filler layer along the partition wall are oxidized by the grown microorganisms, and the cellular material is oxidized by internal respiration.

The treated water thus purified passes through a layer of filter material to remove microorganisms contained in the treated water, and an air supply section installed in the treated water discharge pipe As a result, air is newly mixed in and the treated water is made into peroxygen-containing treated water, which is then returned to the pond or the like to purify the water in the pond or the like.

As described above, the water purification device of the present invention increases the contact distance of the water to be treated with microorganisms by circulating it through the filler layer in a meandering manner along the partition wall, and also allows the water to be treated to circulate through the layer in a meandering manner along the partition wall. This is done before supplying the explosive gas to the filler layer using an ejector action.
Moreover, it is characterized by supplying air to the treated water after water purification so that it can be recirculated to a pond, etc. With this configuration, the biological water purification efficiency by the filler layer is increased, and the treatment It has the special effect of being able to downsize the tank itself.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The water purification device of this embodiment is a pond water purification device, and roughly speaking, it includes a treatment tank 1 and a water inflow section 2.
and a treated water discharge section 3.

The treatment tank 1 is formed as a cylindrical treatment tank, and a support member 5 with a water passage hole 4 is provided in the lower part of the interior thereof, and two partition walls 6 are provided on the upper surface of the support member 5. A filler layer 8 is provided between the partition walls 6 facing each other and between the partition wall 6 and the inner wall 7 of the processing tank. Therefore, the filler layer 8 is formed by the two partition walls 6 and the processing tank inner wall 7 as three filler layers 81, 82, and 83. A filtering material layer 9 is formed above the filler layer 83 and near the treated water discharge section 3 . Here, the filtering material layer 9 is usually made of a mat made of silica and resin, but may be made of other materials.

The treated water inflow section 2 includes a suction pipe 10, a treated water supply pump 11, and a treated water supply pipe 12, and wastewater/sewage is introduced from the suction pipe 10 via the treated water supply pump 11. It is formed so that it can be supplied to the first layer 81 of the filler layer 8 through the treated water supply pipe 12 . Further, an air suction pipe 13 is provided at a midway position of the water supply pipe 12 to supply oxygen into the treatment tank 1 to make the inside of the filler layer 8 under aerobic conditions.
is installed.

The treated water discharge section 3 has a treated water discharge pipe 3' and an air supply section 19, and a starting end side of the treated water discharge pipe 3' is capable of discharging purified water to the outside of the treatment tank 1. As shown in FIG.
It opens at the top of the tank 1, and the other end is led out of the processing tank 1.

Further, a bottom plate 15 is disposed at the bottom of the treatment tank 1, and a sludge accumulation part 16 is disposed between the bottom plate 15 and the support material 5.
A sludge discharge section 17 is formed in the sludge accumulation section 16 for discharging the accumulated sludge to the outside of the treatment tank 1.
is installed.

Here, the treated water inflow part 2 is arranged at the lower part of the treatment tank 1, and the treated water discharge part 3 is arranged at the upper part of the treatment tank 1, and wastewater/sewage is discharged from below the filler layer 81 along the partition wall 6. Although the structure is such that the water is circulated in the direction of the filler layer 82, the treated water inlet 2 is arranged at the upper part of the treatment tank 1, and the treated water discharge part 3 is arranged at the lower part (or upper part) of the treatment tank 1. , wastewater/sewage may be supplied in the opposite direction. In this case, the filtration material layer 9 and the treatment tank inner side port 14 of the treated water discharge section 3 are arranged so as to be located below the filler layer 83.

In addition, the filler layer 8 is not limited to three layers as described above, and for example, one partition wall 6 and two filler layers 8, or three or more partition walls 6. The material layer 8 may have four or more layers. Further, the support material 5 may be arranged at the center or upper part of the processing tank 1, and the partition wall 6
Any configuration may be used as long as it can hold the filler layer 8 and has water passage holes 4 through which wastewater and sewage can pass. Two or more may be provided.

The filler layers 81, 82, 83, . . . are formed of a filler. The filling material in all of these layers may be the same, but usually the first layer 81 is formed with a filling material that has the largest voids, and the later layers have the smallest voids. is formed. However, it goes without saying that other configurations may also be used. Microorganisms are allowed to live within these layers (a microbial film is formed on the filler). Furthermore, the partition wall 6, the inner wall 7 of the processing tank, the supporting material 5, and the filtering material layer 9 may also be used as microbial growth bodies (adhering materials). In this case, the amount of microorganisms (microbial membrane area) per treatment tank can be increased. Further, the filler may be placed in, for example, a mesh bag (each entire layer or each layer divided into smaller pieces). In this case, there is an advantage that the filling material can be replaced easily.

In addition, if there is a large amount of ammonia components etc. in the treated water, the treated water is neutralized between the filter material layer 9 and the filler layer 83 or on the treatment tank inner side port 14 of the treated water discharge part 3 of the filter material layer 9. A neutralization treatment tank 18 may be provided for this purpose. In this case, the water purification power is further increased.
Here, if it is the ammonia component that remains as the neutralized layer 18, crushed limestone, which is usually placed in a net bag or the like for retention, is used.

Next, the operation will be explained based on the above configuration.

First, operate the pump 11 for supplying water to be treated,
Water to be treated having organic components including BOD components, nitrogen components, phosphorus components and other components is forced to flow in from a pond or the like through the suction pipe 10 and the water supply pipe 12 of the water to be treated inlet 2, and Due to the water flow of the treated water flowing through the treated water supply pipe 12,
Air is forcibly sucked in through the air suction pipe 13 using an ejector action, and the air is dispersed and mixed into the water to be treated, and the atomized state is sent into the treatment tank 1. The layer 8 is made into an aerobic atmosphere, and the first layer 8 of the filler layer 8 is moved according to the arrow.
1 along the partition wall 6, the second, third...
The layers 82, 83, . . . are sequentially detoured and circulated. Further, in the lower part of the treatment tank 1, as shown by the arrow, a portion of the water to be treated in the second layer 82 is returned to the first layer 81 to improve the treatment content.

In the process of passing through this circulation, BOD
Components, etc. are accumulated and multiplied within the cells of microorganisms as a food source upon contact with microorganisms, and some of the removed BOD components, etc. are synthesized and become new cellular substances.
The BOD components and the like that circulate through the filler layer 8 in a meandering manner along the partition wall 6 are oxidized by the grown microorganisms, and the cellular substances are oxidized by internal respiration. Here, sludge such as microorganisms flowing out from the filler layer 8 is collected in the sludge accumulation section 16 of the treatment tank 1.
The sludge discharger 17 is periodically operated to discharge the sludge to the outside of the treatment tank 1.

The treated water purified as described above passes through the filter material layer 9 to remove microorganisms contained in the treated water, and is returned to the pond etc. from the treated water discharge part 3, and the water in the pond etc. Purify water.

This operation is carried out continuously and intermittently, and ultimately works to purify water in ponds, etc.

It should be noted that the present invention is not limited to the embodiments described above, and includes modifications that can be made without changing the gist of the present invention. Incidentally, as shown in FIG. 5, even when the treated water inflow section 2 (opening end of the feed pipe 12) is arranged both above and below the treatment tank 1 and the filler layer 8 is backwashed. It may also be configured so that water purification treatment can be performed. In this case, the treated water discharge section 3 is configured so that the treated water can be taken out from between the filtration material layers 9, which reduces clogging in the filler layer 8 and makes the microorganisms in the layer more active. It has the advantage of being able to

As a modification, as shown in FIG. 4, it is also possible to have a configuration in which a plurality of partition walls 6 (three in this case) are arranged horizontally and the filler layer 8 is formed in multiple layers. Here, the partition walls 6 are provided alternately on the inner wall 7 of the treatment tank, and wastewater/sewage follows the arrow and snakes through the filler layer 8 disposed between the partition walls 6, sequentially passing through the filler layer in the rear layer. It is formed so that it can circulate through the layer 8.

[Effect of idea]

As is clear from the above explanation, according to the water purification device of the present invention, the contact distance of the water to be treated with microorganisms is lengthened by circulating the water through the filling material layer in a meandering manner along the partition wall. , the atomization of the air in the water to be treated is carried out by ejector action before being supplied to the filler layer, and air is supplied to the treated water after it has been purified so that it can be recirculated to ponds, etc. , the water to be treated is in an explosive state in advance, the biological water purification efficiency is increased by the packed filler layer, and the treatment tank itself can be made smaller;
Since the treated water itself is forced to contain air, it has the effect of easily purifying the water itself in ponds and the like.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention. Figure 1 is a partially cutaway perspective view with the filler removed, and Figure 2 is a longitudinal cross-section with the filler installed. 3 is a plan view thereof, FIG. 4 is a sectional view of a modified example, and FIG. 5 is a sectional view showing another embodiment of the present invention.
FIG. 6 is a sectional view of a conventional example. 1... treatment tank, 2... wastewater/sewage inflow section, 3...
... Treated water discharge part, 4 ... Water passage hole, 5 ... Support material,
6... Partition wall, 7... Inner wall of treatment tank, 8... Filling material layer, 9... Filtering material layer, 18... Neutralization treatment layer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A water purification device for purifying water to be treated such as wastewater and sewage, which has multiple water passage holes in the lower part of a treatment tank for purifying the water to be treated. At the same time, a plurality of partition walls are erected on the upper surface of the support material, and filler layers in which microorganisms live are placed between the partition walls and the inner wall of the processing tank and between adjacent partition walls. and the filler layer is a filler layer in which a finer filler is disposed on the rear side than the front stage, and a filter material layer finer than the filler layer is disposed in the rear stage of the filler layer. At the same time, a water hydration layer to be treated made of crushed limestone or the like is provided between the filler layer and the filtration layer or after the filtration layer, and the water to be treated is passed through the filler layer and the filtration layer along the partition wall. , the water to be treated is circulated around the hydration layer, and furthermore, a water inlet pipe for forcibly supplying the water to be treated by a pump for supplying the water to be treated is arranged in the front part of the filler layer, An air suction pipe is installed in the middle of the water supply pipe to be sucked in by the water flow of the water to be treated passing through the water supply pipe. The heated and explosive water to be treated can be fed into the filler layer, and if a hydration layer is provided after the filtration layer or after the filtration layer, the water to be treated can be fed to the filling material layer. A treated water discharge pipe for discharging the purified water through the filler layer, filtration layer, and treated water hydration layer is provided after the hydration layer, and the treated water is disposed in the middle of the treated water discharge pipe. A water purification device comprising: an air supply section for activating water and supplying oxygen; and a sludge accumulation section disposed below the support member. (2) Scope of claim for utility model registration (1) where the hydrated layer to be treated is formed by placing crushed limestone, etc. in a mesh bag
The water purification device described in .