JPH11216490A - Organic wastewater treatment equipment - Google Patents

Abstract

(57) [Summary] [Problem] It is possible to improve the processing capacity and reduce the driving power, and the microorganisms are returned to the anaerobic treatment chamber without the microorganisms accompanying the treated water drawn out of the apparatus. It is. SOLUTION: An organic wastewater is aerobically treated by an aerobic microorganism in an aerobic treatment chamber 24, and the treated water is allowed to flow from the aerobic treatment chamber into a filtration vessel 12A, collected by a membrane through a filtration member 12D, and collected. Pull out the device via the water rotary shaft 12E.
Then, the concentrated liquid concentrated in the filtration container 12A was returned to the anaerobic treatment chamber 22. Thereby, the anaerobic microorganisms and aerobic microorganisms in the treated water are separated by filtration by the filtration member 12D of the rotary flat membrane separator 12. Therefore, the microorganisms are returned to the anaerobic treatment chamber 22 together with the concentrated liquid without flowing out of the apparatus together with the treated water, and only the treated water is extracted outside the apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic wastewater treatment apparatus, and more particularly, to a biochemical treatment and membrane filtration of an organic wastewater containing a high concentration of organic matter such as human waste or wastewater from a food processing plant. And an organic wastewater treatment apparatus for treating the wastewater in combination.

[0002]

2. Description of the Related Art Wastewater containing organic matter at a high concentration such as human wastewater is biochemically treated with activated sludge, and the treated water contains solid components in a separator using an ultrafiltration membrane or a microfiltration membrane. A treatment method for separating a concentrated liquid and filtered permeated water, a so-called treatment method combining a biochemical reaction tank and a membrane separator, has attracted attention because highly treated water can be obtained in relatively few steps. And as a separator provided in a conventional organic wastewater treatment apparatus, the inner diameter is 11 to 15
mm or a flat membrane having a channel width of 1 to 3 mm is disposed in a pressure vessel, and the water to be treated is circulated by a circulating pump at a membrane surface flow rate of 2 to 3 m / s and a pressing force of several kg / s. The separator was of a type in which the pressure was supplied into a pressure vessel to a pressure of ² cm ^2, and the concentration polarization of the water to be treated was suppressed while filtering under pressure.

[0003] Further, since human wastewater contains a large amount of fiber components derived from toilet paper and solids such as vinyl, the solids are crushed by a crusher provided in the preceding stage of the biochemical reaction tank. , And removes the residue with a pretreatment remover. However, in the treated liquid from which the residue has been removed, a fiber substance having a crude fiber content of several thousand ppm is still dissolved, and this is agglomerated while undergoing the biochemical treatment, and has a size of several mm to several cm. Grows into a cotton-like solid material, which causes blockage of the flow path of the tubular membrane or flat membrane. Therefore, a strainer and an attached pipe were provided between the biochemical reaction tank and the separator to remove lint-like solids.

[0004] Further, since permeated water obtained by filtering biochemically treated water by a separator still contains chromaticity components, etc., the primary permeated water filtered through the separator by the primary filtration is used as an inorganic system. After adding the flocculant, secondary filtration was performed again with a separator using a tubular membrane or a flat membrane to obtain secondary permeated water, thereby producing regenerated water.

[0005]

However, the conventional organic wastewater treatment apparatus has the following disadvantages. (1) Since the tubular membrane or flat membrane used in the separator of the conventional processing apparatus is of a fixed type, there is a disadvantage that dirt easily adheres to the membrane surface. In addition, since a pressure (several kg / cm ² ) or higher than the permeation pressure is applied to the outer surface of the film, there is a disadvantage that dirt easily accumulates on the film surface. In particular, in the case of wastewater containing a large amount of organic matter, such as human wastewater, the membrane becomes contaminated and the permeation flux of the permeated water is reduced, so that the filtration efficiency is deteriorated. As a result, frequent cleaning with chemicals is required to restore the permeate flux. (2) Since the tubular membrane or the flat membrane is of a fixed type, in order to suppress concentration polarization and increase filtration efficiency, the membrane surface flow rate of the water to be treated is 2-3 m / s, and the pressure is several kg / cm. ^It is necessary to supply the water to be treated into the pressure vessel with a circulation pump so that the pressure becomes ² . Therefore, there is a drawback that an extremely large pump power is required and a pressure-resistant container is required, so that it cannot be integrated with a biochemical reaction tank. (3) Although a strainer is provided between the biochemical reaction tank and the separator to remove solids such as organic substances and then perform primary filtration, the separator is a tubular membrane having an inner diameter of 11 to 15 mm or a flow filter. A flat membrane with a channel width of 1 to 3 mm is provided inside the filtration vessel, and the flow path is narrow due to a closed system, so in the case of wastewater containing high concentrations of organic matter, the flow stagnates and the flow resistance increases significantly. Or As a result, there is a disadvantage that the filtration performance is reduced and the load of the circulating pump power is further increased. In addition, such a disadvantage that the separator is easily affected by the solid matter is another factor that makes the above-mentioned separator not integral with the biochemical reaction tank.

[0006] As described above, the drawback of being easily affected by solid matter is the same in the case of secondary filtration for removing chromaticity components and the like. That is, the primary permeated water contains floc generated by the addition of a flocculant, and when the floc concentration exceeds a predetermined concentration (normally 1.5%), the viscosity of the water to be treated is increased. There is a disadvantage that the flow resistance of the flow path of the membrane is further increased, and the filtration performance is further reduced. As a result, the floc concentration of the concentrated solution can be increased only to about 1%, and the amount of water that is centrifugally dewatered from the excess sludge and returned to the biochemical treatment tank increases. There is a problem that the processing capacity does not increase. Further, the water to be treated is supplied so that the membrane surface flow rate in the secondary filtration is 2-3 m / s, and the floc concentration is 1
%, The transmittance of the amount of permeated water (the ratio of the amount of permeated water to the amount of water to be treated) must be about 2 to 5%. As a result, the circulation amount of the membrane circulation line increases, and the operating power cost of the circulation pump increases. Furthermore, in the secondary filtration, in order to recover the filtration performance of the membrane, it is necessary to frequently perform a washing operation with a chemical agent that dissolves the flocculant. (4) The relationship between the temperature of the water to be treated filtered by the membrane and the transmittance is about 2.5% when the temperature of the water to be treated rises by 1 ° C.
To increase. For example, assuming that the temperature of the treated water treated in the biochemical reaction tank is 20 to 35 ° C., in the case of a conventional organic wastewater treatment apparatus, a strainer is provided between the biochemical reaction tank and the separator and is attached thereto. Because it is necessary to provide piping,
When the processing equipment line becomes longer and warm treated water in the biochemical reactor is supplied to the separator, the water temperature drops by several degrees or more. As a result, the transmittance is reduced by an amount corresponding to the decrease in the water temperature, so that there is a disadvantage that the filtration capacity of the separator is hardly increased.

As described above, the treatment method combining the biochemical reaction treatment and the membrane filtration has attracted attention because highly treated water can be obtained in a small number of steps, but is not satisfactory because of the above-mentioned drawbacks. Was. The present invention has been made in view of such circumstances, less trouble such as clogging due to solid components such as organic substances contained in the water to be treated, and can improve the processing capacity and can reduce the driving power,
Further, the present invention aims to provide an organic wastewater treatment apparatus that is economical because it can be downsized.

[0008]

In order to achieve the above objects, the present invention provides an anaerobic treatment chamber for performing anaerobic treatment with anaerobic microorganisms and an aerobic treatment chamber for performing aerobic treatment with aerobic microorganisms. A biochemical reaction tank in which organic wastewater flows in the order of the anaerobic treatment chamber and the aerobic treatment chamber, an inlet communicating with the aerobic treatment chamber, and an outlet communicating with the anaerobic treatment chamber. A rotating flat membrane separator provided with a hollow water collecting rotating shaft in which a plurality of disc-shaped filtering members are juxtaposed at predetermined intervals in a filtration vessel, and aerobic in the aerobic treatment chamber. The treated water was allowed to flow into the filtration container, and the treated water in the filtration container was subjected to membrane filtration by the filtration member, then extracted outside the device via the water collecting rotation shaft, and concentrated in the filtration container. The concentrate is returned to the anaerobic treatment chamber.

According to the first aspect of the present invention, the organic wastewater is aerobically treated by the aerobic microorganisms in the aerobic treatment chamber, and the treated water is allowed to flow from the aerobic treatment chamber into the filtration vessel and to be filtered by the filtering member. After membrane filtration, it is drawn out of the apparatus via the water collecting rotary shaft. Then, the concentrated liquid concentrated in the filtration container was returned to the anaerobic treatment chamber. As a result, the anaerobic microorganisms and aerobic microorganisms in the treated water are separated by filtration through the filtration member of the rotary flat membrane separator. Therefore, the microorganisms are returned to the anaerobic treatment chamber together with the concentrated liquid without flowing out of the apparatus together with the treated water, and only the treated water is extracted outside the apparatus.

According to a second aspect of the present invention, an air blowing pipe is provided in the aerobic processing chamber, and the water from the air blowing pipe is used to raise the water level in the aerobic processing chamber so that the treated water is discharged. The concentrated liquid in the filtration container was returned to the anaerobic treatment chamber by pushing with the treated water which overflowed later, while flowing into the filtration container. Accordingly, the treated water can be circulated from the aerobic treatment chamber to the anaerobic treatment chamber with air for making the aerobic treatment chamber aerobic, so that a drive source such as a pump for circulation is not required.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an organic wastewater treatment apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows the first embodiment of the organic wastewater treatment apparatus of the present invention.
As shown in the configuration of the embodiment, mainly, a biochemical reaction tank 10, a first rotary flat membrane separator 12, a flocculant adding device 14, and a second rotary flat membrane separator 1 provided in parallel with two systems
6 and 16, and the details will be described below.

A raw water inflow pipe 18 is provided at an upper portion of the biochemical reaction tank 10, and wastewater containing a high concentration of organic impurities is supplied to the biochemical reaction tank 10 through the raw water inflow pipe 18. ing. In addition, the inside of the biochemical reaction tank 10
An anaerobic treatment chamber 22 and an aerobic treatment chamber 24 are divided by a partition plate 20 having a liquid communication port on the lower side, and a partition 26 has a water surface 28 at the bottom of the anaerobic treatment chamber 22.
It is erected at about half the height of. Further, agitators 30 and 30 are provided at the bottom of the anaerobic processing chamber 22, while an air blowing pipe 32 is provided at the bottom of the aerobic processing chamber 24. As a result, the organic wastewater supplied from the raw water inlet pipe 18 to the biochemical reaction tank 10 is anaerobically treated by the anaerobic microorganisms while being gently stirred in the anaerobic treatment chamber 22, and aerated in the aerobic treatment chamber 24. The aerobic treatment by the aerobic microorganisms is performed in the state which was performed.

A first filtration vessel 12A of the first rotary flat membrane separator 12 is provided near the water surface 28 of the anaerobic treatment chamber 22. One side of the first filtration vessel 12A also serves as the partition plate 20. I have. A control weir 36 is formed at the position of the water surface 34 of the partition plate 20, and when the control surface 36 is opened by raising the water surface 34 of the aerobic treatment chamber 24 by the air blown from the air blowing pipe 32. The target treated water overflows into the first filtration container 12A. A return pipe 12B for returning the concentrated liquid to the biochemical reaction tank 10 is provided at the bottom of the first filtration container 12A, and a valve 1 for adjusting the return amount is provided in the return pipe 12B.
2C is provided. In addition, the first filtration container 12A
Inside, two hollow water collecting rotating shafts 12E in which a plurality of disk-shaped filtering members 12D are arranged at predetermined intervals so as to be immersed in the treated water flowing into the first filtering container 12A, are arranged in parallel. The water collecting rotary shaft 12E is provided, and is supported by the first filtration container 12A. One end of the water collecting rotating shaft 12E is connected to a motor (not shown), and has a rotational peripheral speed of 2.2 m / m.
It rotates in s. On the other hand, the collecting rotary shaft 12
The other end of E is connected to the primary permeated water pipe 38 so as to guide the permeated water out of the first filtration container 12A. Also,
The filtration member 12D has a polysulfone-based filtration membrane having a molecular weight cutoff of 750,000 attached to the surface of a water-permeable disc-shaped disk. Thereby, the treated water treated in the aerobic treatment chamber 24 overflows from the control weir 36 into the first filtration container 12A and is filtered by the filtration member 12D to obtain the primary permeated water, while the concentrated liquid is removed later. It is pushed by the overflowing treated water and returned to the biochemical reaction tank 10 via the return pipe 12B.

The primary permeated water pipe 38 is connected to the mixing vessel 1 of the flocculant adding device 14 through a first drawing pump 40.
It is connected to the entrance of 4A. This coagulant adding device 14
Is composed of the mixing vessel 14A, the coagulant addition pump 14B, and the alkali addition pump 14C. An inorganic coagulant such as ferric chloride is added from the coagulant addition pump 14B. An alkali agent of a sodium solution is added and mixed with the primary permeated water in the mixing vessel 14A. The primary permeated water supply pipe 42 extending from the outlet of the mixing vessel 14A is branched in two directions by a switching valve 44, and each of the branched primary permeated water supply pipes 42 is provided in parallel with two systems. The second rotary flat membrane separators 16 are connected to a second filtration container 16A. The second filtration vessel 16A is formed of a pressure vessel, and contains therein an element such as a filtration member 16C disposed on a water collection rotating shaft 16B, similarly to the first rotary flat membrane separator 12. In addition, each water collecting rotary shaft 16
B is connected to each of the secondary permeate discharge pipes 46, and the respective secondary permeate discharge pipes 46 join via a valve 48, and then are connected to a secondary permeate storage tank (not shown) via a second drawing pump 50. Is connected to. In addition, each second filtration container 16A
Is provided at the bottom of the pipe, and the drain pipe 52 is connected to an excess sludge dewatering device (not shown) via a valve 54.

Further, the first and second drawing pumps 4
ON and OFF means are provided at 0 and 50, and the first and second rotary flat membrane separators 12 and 14 are adapted to intermittently withdraw permeated water. Next, the operation of the organic wastewater treatment apparatus of the present invention configured as described above will be described.

First, the operation of the rotary flat membrane separator used in the organic wastewater treatment apparatus of the present invention will be described. Referring to the example of the first rotary flat membrane separator 12 as shown in FIG. 2, a plurality of hollow water collecting rotary shafts 12E in which a plurality of disk-shaped filtration members 12D are arranged at predetermined intervals are provided in parallel. In addition, each of the filtering members 12D is configured to intersect with each other so that the adjacent filtering members 12D rotate while intersecting with each other. Thereby, the filtering member 12D
Since a rapid liquid flow and turbulent flow occur on the surface and the concentration polarization of the water to be treated is suppressed, a circulating pump and a piping system for giving the membrane surface flow velocity like a conventional separator are required. Instead, the water to be treated can be efficiently filtered by the filter member 12D only by making the inside of the filter member 12D negative pressure by the first drawing pump 40. In addition, dirt attached to the filtering member 12D due to the generation of turbulence is effectively removed, and
Since solids entering between the filtering members 12D can be forcibly removed, troubles such as clogging by the solids can be reduced, and a decrease in permeation flux can be suppressed for a long time.

The organic wastewater treatment apparatus of the present invention does not require a circulating pump or a pressurized vessel for the membrane surface flow rate or pressurization unlike a conventional separator using a tubular membrane or a flat membrane. The use of the rotary flat membrane separator which causes less troubles such as clogging by solids causes the processing apparatus of the present invention to provide the following effects. That is, about 25 from the raw water inflow pipe 18
The organic wastewater supplied to the biochemical reaction tank 10 having a capacity of 0 m ³ is first anaerobically treated by anaerobic microorganisms in the anaerobic treatment chamber 22. Subsequently, the treated water aerobically treated by the aerobic microorganisms in the aerobic treatment chamber 24 is supplied to the air blowing pipe 32.
When the water level of the aerobic treatment chamber 24 rises due to the air blown from the tank, the water is supplied to the first filtration vessel 12A of the first rotary flat membrane separator 12 through the control weir 36. First
The treated water supplied to the filtration container 12A is filtered by the rotating filtration member 12D to obtain primary permeated water, while the concentrated liquid is pushed by the treated water overflowing later and is returned via the return pipe 12B. And returned to the biochemical reactor 10. As described above, the first rotary flat membrane separator 12 is provided in the biochemical reaction tank 10, and the treated water flows into the first filtration container 12 </ b> A by the flow of the treated water in the biochemical reaction tank 10. 1. Since the concentrated liquid concentrated in the filtration vessel 12A is caused to flow out to the biochemical reaction tank 10, the entire processing apparatus can be reduced in size, and the operating power is not required because a circulation pump is not required unlike the conventional processing apparatus. Can be reduced. Further, since the treated water can be filtered while keeping the warm water temperature due to the heat of reaction in the biochemical reaction tank 10, the filtration efficiency can be increased.

Next, the primary permeated water filtered by the first rotary flat membrane separator 12 is drawn by a first drawing pump 40, and then passes through a primary permeated water pipe 38 to mix the mixing vessel 14A.
And the mixing agent 14A is supplied to the mixing vessel 14A.
After the addition of the ferric chloride inorganic coagulant from 4B and the addition of sodium hydroxide solution for pH adjustment from the alkali addition pump 14C, it is immediately supplied to the second rotary flat membrane separator 16. You. That is, the primary permeated water to which the coagulant and sodium hydroxide are added is sufficiently stirred and mixed by the rotation of the filter member of the second rotary flat membrane separator, so that a long residence time in the mixing vessel 14A is obtained. No need to take. As a result, the filtration can be performed while maintaining the warm water temperature of the primary permeated water, so that the filtration efficiency in the secondary filtration treatment can be increased.

Next, as the primary permeated water to which the coagulant and sodium hydroxide are added, the secondary permeated water filtered by the second rotary flat membrane separator 16 is obtained, and the concentrated liquid is formed of excess sludge. And is withdrawn from the withdrawal pipe 52. At this time, in the organic wastewater treatment apparatus of the present invention, the second rotary flat membrane separators 16, 16 are provided in parallel in two systems, and are switched and used alternately by the switching valve 44. It can be concentrated to the concentration limit where viscosity increases. As a result, the floc concentration can be increased to the concentration limit at which the viscosity of the concentrated solution increases, so that the concentration ratio of the concentrated solution can be increased, and the water concentration of the excess sludge can be reduced. Therefore, the amount of circulating water that is centrifugally dehydrated from the excess sludge and returned to the biochemical reaction tank 10 can be reduced, so that the processing capacity of the processing apparatus can be increased.

Further, the organic wastewater treatment apparatus of the present invention comprises:
ON-O is applied to the first and second drawing pumps 40 and 50.
The first and second rotary flat membrane separators 1 provided with FF means;
Since the extraction of the permeated water of 2, 16 was performed intermittently, when the extraction pump was turned off, the filtration member 12D,
Since the negative pressure in 16C is released and the permeated water in filter members 12D and 16C seeps out of filter members 12D and 16C, the membrane can be backwashed. Therefore, the dirt adhering to the membrane surface can be periodically and automatically removed, so that the permeation flux can be further reduced.

As described above, the organic wastewater treatment apparatus of the present invention can significantly improve the treatment capacity as compared with the conventional organic wastewater treatment apparatus, can reduce the driving power, and can reduce the size of the apparatus. Can be Incidentally, as an example using the organic wastewater treatment apparatus of the present invention, the treated water passing through the control weir 36 has an average SS concentration of 10,000.
There were about 150 tons per day in ppm and 50 tons of primary permeate was obtained. The primary concentrated liquid has an average SS concentration of 150
It was 100 tons per day at 00 ppm. As is clear from this result, the transmittance (the ratio of the amount of permeated water to the supply amount of the water to be treated) is 33%, and a very high transmittance can be obtained. I got it. Then, the treated water treated in the biochemical reaction tank 10 was directly supplied to the first rotary flat membrane separator 12 without passing through the strainer, but no trouble based on the solid matter occurred.

Further, 49.25 tons of secondary permeated water could be obtained per day. As can be seen from this, since almost all of the primary permeated water can be filtered, the concentration ratio of the concentrated liquid was increased, and the water content in the excess sludge could be made extremely low. In addition, the quality of the secondary permeate (SS, CO
D, TOC, T-N, chromaticity, etc.) were equivalent to those of a conventional organic wastewater treatment apparatus equipped with a separator using a tubular membrane. Moreover, the operating power of the portion of the organic wastewater treatment apparatus of the present invention except for the biochemical reaction tank 10 is about 30 to 30 times larger than that of the conventional organic wastewater treatment apparatus except for the biochemical reaction tank 10. It was 35%, which was less than half. Further, the number of times of chemical cleaning of the membranes of both the first rotary flat membrane separator 12 and the second rotary flat membrane separator 16 could be suppressed to 1 or less, which is sufficiently smaller than that of the conventional separator using a tubular membrane.

Next, a second embodiment of the method and apparatus for treating organic wastewater of the present invention will be described. The same members as those in the first embodiment are denoted by the same reference numerals, and the description of the same parts as those in the first embodiment will be omitted. FIG. 2 is a sectional view of an apparatus for treating wastewater generated from a building to obtain reclaimed water. The biochemical reactor 10 is installed on an underground base 55, and the first rotary flat membrane separator 12
Is a gantry 56 attached to the side of the biochemical treatment tank 10.
It is installed above. In addition, the first rotary flat membrane separator 12
A part of the concentrated liquid is returned to the biochemical treatment tank 10 by the concentrated liquid discharge pump 58, and a part is removed from the system as excess sludge from the valve 60. The primary permeated water extracted by the first extraction pump 40 is mixed with the ferric chloride inorganic coagulant from the coagulant addition pump 14B in the mixing vessel 14A and the P-water is added from the alkali addition pump 14C.
After a sodium hydroxide solution for adjusting H is added and stirred for a short time by the stirrer 62, the solution is supplied to the second rotary flat membrane separator 16 using a head difference. The primary permeate supplied to the second rotary flat membrane separator 16 is filtered to obtain a secondary permeate. When the SS concentration reaches a predetermined value, the concentrated liquid is extracted from the extraction pipe 52 as excess sludge. Thereby, also in the case of the second embodiment,
The same effect as that of the first embodiment can be obtained, and the equipment occupied area of the separator part of the processing apparatus of the second embodiment is one half that of the conventional separator using a flat membrane. It can be as follows, and is suitable for installation under a narrow building. By the way, by supplying to the second rotary flat membrane separator 16 by utilizing the head difference, a pressure corresponding to the amount of water column is applied from the outer surface of the filtration membrane. Since the efficiency is extremely improved, the SS concentration of the concentrated concentrate is 30,000 ppm.
It can be concentrated to the above, and the concentration ratio is 1
It was more than 00 times. When the primary permeated water is filled after all the concentrated liquid is drawn out and the filtration member 16C is rotated at a high speed, the contamination on the filtration membrane surface can be effectively removed.

[0024]

As described above, according to the organic wastewater treatment apparatus of the present invention, the treatment capacity can be improved as compared with the conventional organic wastewater treatment apparatus, and the circulating pump as in the prior art can be improved. , The driving power can be reduced. The microorganisms are returned to the anaerobic treatment chamber without the microorganisms being entrained in the treated water drawn out of the apparatus.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a first embodiment of an organic wastewater treatment apparatus according to the present invention.

FIG. 2 is a perspective view of a main part of a rotary flat membrane separator used in an organic wastewater treatment apparatus according to the present invention.

FIG. 3 is a cross-sectional view illustrating a second embodiment of the organic wastewater treatment apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Biochemical reaction tank 12 ... First rotary flat membrane separator 12A ... First filtration container 12D, 16C ... Filter member 12E, 16C ... Water collecting rotary shaft 14 ... Coagulant addition device 14A ... Mixing container 14B ... Coagulation Agent addition pump 14C Alkali addition pump 16 Second rotary flat membrane separator 18 Raw water inflow pipe 40 First draw pump 44 Switching valve 50 Second draw pump

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C02F 1/52 ZAB C02F 1/52 ZABE 9/00 501 9/00 501F 502 502E 502P 503 503C 503D 504 504A 504E (72) Inventor Naoki Okuma 1-1-14 Uchikanda, Chiyoda-ku, Tokyo Hitachi Plant Construction Co., Ltd. (72) Inventor Toru Aoi 2-1-1 Kandanishikicho, Chiyoda-ku, Tokyo Sumitomo Heavy Industries Kanda Office (72 Inventor Katsuyuki Motomura 2-1-1 Kanda Nishikicho, Chiyoda-ku, Tokyo Sumitomo Tomo Heavy Industries Co., Ltd.

Claims (2)

[Claims] An anaerobic treatment chamber for performing anaerobic treatment with anaerobic microorganisms, and an aerobic treatment chamber for performing aerobic treatment with aerobic microorganisms, wherein organic wastewater is supplied to the anaerobic treatment chamber, A biochemical reaction tank flowing in the order of the processing chamber, a plurality of disc-shaped filtering members are provided in a filtering container having an inlet communicating with the aerobic processing chamber and an outlet communicating with the anaerobic processing chamber. A rotating flat membrane separator provided with hollow water collecting rotary shafts arranged side by side at intervals; and a treatment water aerobically treated in the aerobic treatment chamber flows into the filtration vessel, and the filtration vessel The organic water is characterized in that the treated water in the inside is subjected to membrane filtration by the filtration member, and then is drawn out of the apparatus through the water collecting rotation shaft, and the concentrated liquid concentrated in the filtration vessel is returned to the anaerobic treatment chamber. Wastewater treatment equipment. 2. An air blowing pipe is provided in the aerobic processing chamber,
By raising the water surface in the aerobic treatment chamber by the air from the air blowing pipe, the treated water is caused to overflow into the filtration container through the inflow port, and is pushed by the treated water that overflows later. 2. The organic wastewater treatment apparatus according to claim 1, wherein the concentrated liquid in the filtration container is returned from the outlet to the anaerobic treatment chamber.