JPH04256497A - Waste water treating device - Google Patents

Abstract

PURPOSE:To decrease the fat and oil components contained in purified water to be discharged and to decrease the discharge treatment amt. of the oil- components in a separating tank by efficiently decomposing and digesting the fat and oil components in waste water. CONSTITUTION:A microorganism enzyme agent which can decompose the fat and oil components is charged into a raw water tank 1 and a decomposition digester tank 2 and an air diffusion pipe for aeration is disposed, by which the decomposition treatment of the waste water is executed in two stages and the treatments thereof are surely and efficiently executed. The fat and oil components which are heretofore imperfect in decomposition are again subjected to the decomposition treatment by connecting a fat and oil return pipe 17A and a sludge return pipe 18 between the decomposition digester tank 2 and the separating tank 3, by which the discharge treatment amt. of the oil components is decreased.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus that uses a microbial enzyme agent to efficiently purify wastewater containing especially oils and fats.

0002

[Prior Art] In conventional wastewater treatment equipment, for example, a raw water tank, an aeration tank, and a pressurized flotation tank are connected by pumps, and the wastewater that flows into the aeration tank via the raw water tank is particularly free of oil and fat. After activation and purification with air from the air diffuser, the oil and fat separation flotation agent is injected into the pressure flotation tank, and pressurization and depressurization are performed to float the oil and fat to the water surface. It had a structure in which oil and fat were removed using an oil and fat removal device such as a scraper. In order to avoid oil and fat from the wastewater treated in this manner, only intermediate water is collected and discharged into a sewer pipe or the like.

0003

[Problems to be Solved by the Invention] However, it is difficult to completely separate the oil and fat content of wastewater using the conventional equipment as described above, and the purified water that is drained still contains a high proportion of oil and fat. In addition to remaining oil and fat, a large amount of oil and fat floats to the surface in the pressurized flotation tank and aeration tank, making the extraction process difficult.

[0004] Therefore, the present invention was made in consideration of such problems, and the purpose of the present invention is to efficiently decompose and digest fats and oils in wastewater, thereby reducing the amount of fats and oils contained in purified water that is discharged. It is an object of the present invention to provide a wastewater treatment device that can reduce the amount of oil and fat extracted and reduce the amount of oil extracted in a separation tank.

[0005]

[Means for Solving the Problems] The invention as claimed in claim 1 constitutes a wastewater treatment device in which a chemical supply pipe for a microbial enzyme agent is connected to a raw water tank and a decomposition/digestion tank, and a diffuser pipe for aeration is further arranged. The above problems are solved by a structure in which wastewater is treated in two stages, and the microbial enzyme agent and air are mixed and activated before the wastewater is transferred to the decomposition/digestion tank.

[0006] Furthermore, the invention according to claim 2 provides a separation tank with a partition wall whose upper part protrudes above the water surface and whose lower part is formed with a communication port, so that wastewater from the decomposition and digestion tank can flow into the separation tank. The storage chamber is divided into a storage chamber for discharging the wastewater flowing from the storage chamber through the communication port to the outside of the separation tank, and the storage chamber and the digestion tank are separated by an oil return pipe and a sludge return pipe. The above problem can be solved by configuring a wastewater treatment device in which the oil and fat return pipe is connected by a pipe, and the suction port of the fat return pipe is arranged near the water surface of the storage chamber, and the suction port of the sludge return pipe is arranged near the bottom of the storage chamber. has been resolved.

[0007]

[Operation] According to the invention in which a chemical supply pipe and an aeration pipe are arranged in the raw water tank and the decomposition/digestion tank, the oil and fat content of the wastewater is decomposed by the microbial enzyme agent not only in the decomposition and digestion tank but also in the raw water tank, making it efficient. Wastewater treatment is well carried out. especially,
Since the wastewater is once aerated in the raw water tank and transferred to the decomposition/digestion tank in a state where the decomposition reaction is activated, the processing efficiency of fats and oils in the decomposition/digestion tank becomes high.

[0008] Furthermore, according to the invention in which two return pipes are connected between the digestion tank and the separation tank, fats and oils that are not decomposed in the digestion tank can be returned to the digestion tank via the fat return pipe for processing. Therefore, processing efficiency can be increased, and the amount of oil and fat floating in the separation tank can be reduced. Since the upper part of this separation tank is partitioned into a storage chamber and a drainage chamber by a partition wall, the floating oil and fat do not flow into the drainage chamber, and the purified water discharged from this device is extremely high in oil and fat. It becomes less. On the other hand, the sludge return pipe returns the activated sludge that has settled near the bottom of the separation chamber to the decomposition and digestion layer, so that it can be used again to decompose fats and oils.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be explained based on FIG. This figure is a configuration diagram of a wastewater treatment device according to an embodiment.

[0010] In this wastewater treatment device, a raw water tank 1, a decomposition and digestion tank 2, and a separation tank 3 are arranged in this order, and a raw water introduction pipe 4 is connected to the raw water tank 1, so that the raw water tank 1 and the decomposition and digestion tank 2 are connected. The raw water supply pipe 8 connects the decomposition and digestion tank 2 and the separation tank 3 with a communication pipe 16, and the separation tank 3 is connected to a drain pipe 24. That is, this wastewater treatment apparatus has a structure in which wastewater is purified by flowing it through a raw water tank 1, a decomposition and digestion tank 2, and a separation tank 3 in this order.

A raw water inlet pipe 4 for introducing waste water is connected to the raw water tank 1 via a screen 6 for removing dust. Further, a pump 7 is installed at the bottom of the tank 1, and a raw water supply pipe 8 for sending wastewater to the decomposition/digestion tank 2 is connected to this pump 7. Similarly, a diffuser pipe 14 for aeration is installed at the bottom of the tank 1, and this is connected to the air supply device 12 via the air supply pipe 13.
A drug supply pipe 11 connected to the pipe and having a pump 10 in the middle
are connected.

The decomposition and digestion tank 2 is connected to the raw water supply pipe 8 described above, and the bottom of the tank 2 is connected to a communication pipe 16 with the separation tank 3. A diffuser pipe 15 for aeration connected to the air supply pipe 13 described above is installed at the bottom of the tank 2, and the drug supply pipe 11 is also connected to the tank 2.

As the drug, a microbial enzyme agent such as Hypolka O (trade name, manufactured by Shikoku Kasei Kogyo Co., Ltd.) is used. In this microbial enzyme agent, the enzymes and bacteria contained in the agent begin to decompose and digest the oils and fats in wastewater, and the mutual activity of the two decomposes the polymeric oils and fats at the molecular structure level. It reduces the oil and fat content of. Incidentally, Hypolka O is a processing agent containing microorganisms particularly excellent in decomposing fats and oils, and is suitable as the microbial enzyme agent of the present invention. In addition, by appropriately introducing nutrients such as nitrogen and phosphorus into the raw water tank 1 and decomposition/digestion tank 2 into which this enzyme is introduced, the bacteria in the enzyme can be activated, resulting in more effective decomposition and digestion activities. You can also make it happen.

The separation tank 3 has a communication pipe 16 connected to its bottom and a drain pipe 24 connected to the vicinity of the water surface.
It is divided into a storage chamber 3A connected to the communication pipe 16 and a drainage chamber 3B connected to the drain pipe 24. The upper end of this partition wall 19 protrudes above the water surface of the tank 3, while the lower end forms a gap 19a serving as a communication port between it and the bottom, and the storage chamber 3A and the drain chamber 3B communicate with each other at the bottom. The situation is as follows. In addition, the bottom of the separation tank 3, that is, the bottom of the storage chamber 3A, has an inverted triangular side projecting downward, and activated sludge, which is a combination of fats and oils and microbial enzymes, settles here. ing. Further, a suction port 17a for floating oil and fat is installed slightly below the water surface of the storage chamber 3A, and a fat return pipe 17A whose tip is connected to the decomposition and digestion tank 2 is connected to this suction port 17a. . Also,
An activated sludge suction port 18a is arranged near the bottom of the storage chamber 3A, and a sludge return pipe 18, whose tip end is connected to the decomposition and digestion tank 2, is connected to the suction port 18a.

A partition plate 16a is provided near the outlet of the communication pipe 16.
are arranged so that the waste water flowing in from the communication pipe 16 does not directly flow into these suction ports 17a and 18a. Further, the above-mentioned air supply pipe 13 is connected to the intermediate portions of these return pipes 17A and 18, and the structure is such that the waste water and activated sludge containing oil and fat are returned to the decomposition and digestion tank 2 by air pressure.

[0016] An oil and fat storage tank 21 is provided near the separation tank 3, and to this oil and fat storage tank 21, the oil and fat return pipe 17B branched from the middle part of the above-mentioned oil and fat return pipe 17A is connected. Return pipe 2 from oil storage tank 21 to raw water tank 1
By piping 2, it is possible to return the intermediate water in the oil/fat storage tank 21 to the raw water tank 1 for treatment. Note that a valve 20 is attached to each of the oil return pipes 17A and 17B, and by switching these valves 20, the destination of the oil return is selected.

Next, the operation of this embodiment will be explained. first,
The wastewater that has flowed into the raw water tank 1 from the raw water introduction pipe 4 is charged with a microbial enzyme agent from the chemical supply pipe 11, and is further aerated with air released from the aeration pipe 14. After the wastewater has been decomposed and digested to some extent in the same tank 1, this wastewater is transferred to the decomposition and digestion tank 2 by the pump 7 and the raw water supply pipe 8.

In the decomposition and digestion tank 2, a microbial enzyme agent is further supplied through a chemical supply pipe 11, and air is supplied through an aeration pipe 15 for aeration, thereby decomposing and digesting fats and oils. . At this time, a larger amount of microbial enzyme agent and air are introduced than in the raw water tank 1, and the treatment takes a longer time. When the wastewater is purified to a predetermined degree, the wastewater is transferred to the separation tank 3 through the communication pipe 16.

In the separation tank 3, the wastewater is first transferred to the storage chamber 3.
It flows into A and is temporarily stored there. Although some fats and oils remain undecomposed in the wastewater, the fats and oils, which have a lower specific gravity than water, float near the water surface of the storage chamber 3A, and the purified water and fats and oils are separated. The floating fats and oils are then sucked into the suction port 17a, returned to the decomposition and digestion tank 2 through the fats and oils return pipe 17A, and decomposed and digested in the tank 2 again. On the other hand, activated sludge, which is a lump of microbial enzymes and fats and oils, also settles at the bottom of the storage chamber 3A, but this activated sludge is also returned to the decomposition and digestion tank 2 from the suction port 18a via the sludge return pipe 18. Ru. Note that this activated sludge is in a state where microorganisms are actively decomposing fats and oils, and when it returns to the decomposition and digestion tank 2, it further takes in other fats and oils and decomposes it. Note that the intermediate water in the separation tank 3 flows into the drain chamber 3B side through the gap 19a on the lower side of the partition wall 19, and is further drained from the drain pipe 24 near the water surface of the tank 3B. At this time, it is also possible to further form a discharge pump tank and drain the purified water stored there using a pump.

Further, substances that cannot be decomposed even after the above-mentioned circulation accumulates in the upper layer of the separation tank 3 over time, but these substances can be transferred to the oil storage tank 21 by adjusting the valve 20. Can be separated and discarded. In addition, at this time, the intermediate water of the oil and fat storage tank 21 is further collected,
This may be returned to the raw water tank 1 through the reflux pipe 22.

[0021] As described above, in the purification apparatus of this embodiment, wastewater is decomposed and digested not only in the decomposition/digestion tank 2 but also in the raw water tank 1 by the microbial enzyme agent, and the wastewater treatment is carried out in two stages. In addition, since the wastewater is introduced into the decomposition/digestion tank 2 in a state where the microbial enzyme agent and air are mixed, it has the effect that the treatment within the tank 2 is carried out more effectively.

[0022] In addition, the fats and oils that have surfaced in the separation tank 3 are returned to the decomposition and digestion tank 2 for decomposition treatment.
The amount of extraction processing can be reduced. Further, in this embodiment, the partition wall 19 of the separation tank 3 forms a gap 19a at the lower end, but the storage chamber 3A and the drainage chamber 3
The communication port between B may be formed at the lower part of the partition wall 19,
For example, in the case where the sludge recovery section is formed at the bottom as described above, the partition wall may be provided all the way to the bottom, and the lower part may be opened to form a communication port.

Furthermore, in this example, a microbial enzyme agent that mainly decomposes oil and fat components was used as a drug;
Of course, microbial enzymes that decompose other organic substances (proteins, carbohydrates, etc.) may also be used together.

[0024]

[Effects of the Invention] As explained above, the wastewater treatment device of the present invention in which the raw water tank is provided with a chemical supply pipe and an aeration pipe can perform the decomposition and digestion treatment of wastewater in two stages.
Furthermore, since the wastewater is introduced into the digestion tank in an activated state by mixing microbial enzymes and air, it is possible to efficiently process fats and oils.

[0025] Furthermore, according to the invention in which a return pipe is provided between the decomposition and digestion tank and the separation tank, the floating fats and oils are returned to the decomposition and digestion tank for treatment, and the activated sludge is also returned to the decomposition and digestion tank again. Since it can be returned and used, the fats and oils can be effectively decomposed and digested, and the amount of fats and oils extracted in the separation tank can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of a wastewater treatment device according to an example.

[Explanation of symbols]

1 Raw water tank 2 Decomposition digester 3 Separation tank 3A Storage chamber 3B Drain room 11 Drug supply pipe 14,15　Air diffuser pipe 17a, 18a Suction port 17,18 Return pipe

Claims (2)

[Claims] [Claim 1] A raw water tank and a decomposition/digestion tank are communicated, and the decomposition/digestion tank and a separation tank are communicated, and then wastewater is distributed from the raw water tank to the separation tank, and is aerated in the decomposition/digestion tank. This is a wastewater treatment device for purifying wastewater by water treatment, in which the raw water tank and the decomposition/digestion tank are connected to a chemical supply pipe for a microbial enzyme agent capable of decomposing fats and oils, and the raw water tank is also equipped with an aeration pipe. A wastewater treatment device characterized by having: 2. A raw water tank and a decomposition/digestion tank are communicated, and the decomposition/digestion tank is communicated with a separation tank, and then wastewater is circulated from the raw water tank to the separation tank, and fats and oils are transferred to the decomposition/digestion tank. A wastewater treatment device that purifies wastewater by introducing a degradable microbial enzyme agent and performing aeration treatment, comprising:
By providing the separation tank with a partition wall whose upper part protrudes above the water surface and whose lower part has a communication port, the separation tank can be
It is divided into a storage chamber into which wastewater flows from the decomposition/digestion tank, and a drainage chamber which discharges the wastewater that flows in from the storage chamber through the communication port to the outside of the separation tank, and the storage chamber and the decomposition/digestion tank. are connected by a fat return pipe and a sludge return pipe, and the suction port of the fat return pipe is located near the water surface of the storage chamber, and the suction port of the sludge return pipe is located near the bottom of the storage chamber. wastewater treatment equipment.