CN113371946A

CN113371946A - Multi-membrane sewage treatment system and method thereof

Info

Publication number: CN113371946A
Application number: CN202110781858.6A
Authority: CN
Inventors: 张宇
Original assignee: Nanjing Hongshunhe Biotechnology Co ltd
Current assignee: Nanjing Hongshunhe Biotechnology Co ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2021-09-10

Abstract

The invention provides a multi-membrane sewage treatment system, comprising: the system comprises a biological anaerobic tank, a biological oxidation tank, a secondary sedimentation tank, a SIC membrane filtering device, a sulfonated polyether sulfone membrane filtering device and an RO membrane filtering device, wherein the biological anaerobic tank is connected with the biological oxidation tank through a first conveying device, the biological oxidation tank is connected with the secondary sedimentation tank through a second conveying device, the secondary sedimentation tank is connected with the SIC membrane filtering device through a third conveying device, the SIC membrane filtering device is connected with the sulfonated polyether sulfone membrane filtering device through a fourth conveying device, the sulfonated polyether sulfone membrane filtering device is connected with the RO membrane filtering device through a fifth conveying device, and the first conveying device, the second conveying device, the third conveying device, the fourth conveying device and the fifth conveying device are controlled and adjusted through a control system. According to the invention, the sulfonated polyether sulfone membrane filtering device is used for carrying out the filtering operation firstly after the sewage is subjected to biochemical treatment and before the RO filtration, so that the COD value in the sewage is effectively reduced, and the filtering load pressure of the RO membrane is reduced.

Description

Multi-membrane sewage treatment system and method thereof

Technical Field

The invention relates to the field of sewage treatment, in particular to a multi-membrane sewage treatment system and a method thereof.

Background

With the development of various industries, environmental protection has become an important social concern, wherein the problem of water pollution is also mentioned continuously, and reclaimed water recycling treatment is a key scheme for dealing with water pollution at present, and sewage reaches the standard of reuse or direct discharge by performing multi-dimensional purification on domestic sewage or production sewage.

The water reuse treatment process generally mainly comprises physical treatment, biochemical treatment, advanced treatment and other links. The specific sewage utilizes the RO membrane to filter after generally carrying out biochemical treatment earlier, because the COD value before the RO filters is very high, and load pressure when the RO filters is very big, and the trapped fluid of RO can reach standard and discharge only need carry out comparatively complicated aftertreatment moreover.

Disclosure of Invention

In view of the above-mentioned problems in the background art, the present invention provides a multi-membrane sewage treatment system, comprising: the pretreated sewage sequentially enters the biological anaerobic tank, the biological oxidation tank, the secondary sedimentation tank, the SIC membrane filtering device, the sulfonated polyether sulfone membrane filtering device and the RO membrane filtering device for purification operation, the biological anaerobic tank is connected with the biological oxidation tank through a first conveying device, the biological oxidation tank is connected with the secondary sedimentation tank through a second conveying device, the secondary sedimentation tank is connected with the SIC membrane filtering device through a third conveying device, the SIC membrane filtering device is connected with the sulfonated polyether sulfone membrane filtering device through a fourth conveying device, the sulfonated polyether sulfone membrane filtering device is connected with the RO membrane filtering device through a fifth conveying device, and the first conveying device, the second conveying device, the RO membrane filtering device and the SIC membrane filtering device are connected through a fourth conveying device respectively, The third conveying device, the fourth conveying device and the fifth conveying device are controlled and adjusted through the control system.

As a preferable aspect of the present invention, wherein: an air pressing device is matched with the biological oxidation pond and is used for compressing air and then injecting the compressed air into the biological oxidation pond from the bottom of the biological oxidation pond.

As a preferable aspect of the present invention, wherein: and the third conveying device, the fourth conveying device and the fifth conveying device are respectively provided with a high-pressure pump, and the three high-pressure pumps are used for respectively performing pressure filtration on the SIC membrane, the sulfonated polyether sulfone membrane and the RO membrane so as to improve the filtration efficiency.

Further, the SIC membrane filtration device comprises: the two ends of the third conveying device are respectively connected with the secondary sedimentation tank and the SIC membrane filter, filtrate of the SIC membrane filter is conveyed into the first intermediate tank through a connecting pipe, and intercepted liquid of the SIC membrane filter is respectively refluxed into the secondary sedimentation tank and the biological oxidation tank through a shunting device.

As a preferable aspect of the present invention, wherein: the device comprises a sulfonated polyether sulfone membrane filter and a second intermediate tank, wherein two ends of a fourth conveying device are respectively connected with the first intermediate tank and the sulfonated polyether sulfone membrane filter, filtrate of the sulfonated polyether sulfone membrane filter is conveyed into the second intermediate tank through a connecting pipe, and retentate of the sulfonated polyether sulfone membrane filter can reach the standard and be discharged after being subjected to biological and anaerobic treatment.

As a preferable aspect of the present invention, wherein: and the two ends of the fifth conveying device are respectively connected with the second intermediate tank and the RO membrane filtering device, filtrate of the RO membrane filtering device is conveyed into the collecting tank through the connecting pipe, and intercepted liquid of the RO membrane filtering device is simply treated and then discharged up to the standard.

As a preferable aspect of the present invention, wherein: set up the slope spout in the diverging device, SIC membrane filter's the trapped fluid flows down along the spout from the top of slope spout, and the lower trapped fluid of concentration is located the upper strata, and the higher liquid level of intercepting of concentration is in the bottom, the bottom of slope spout is provided with first outlet port, second discharge port, first outlet port is seted up on the lateral wall of slope spout, the tank bottom position at the slope spout is seted up to the second discharge port, first outlet port passes through the connecting pipe and sinks the pond intercommunication with two, the second discharge port passes through connecting pipe and biological oxidation pond intercommunication.

As a preferable aspect of the present invention, wherein: the bottom surface of the inclined sliding groove is provided with a plurality of horizontally arranged grooves which are distributed along the bottom plate of the inclined sliding groove in a step shape.

As a preferable aspect of the present invention, wherein: the method is implemented according to the following steps:

s1, sewage pretreatment; s2, biochemical treatment, namely, sequentially feeding the sewage into a biological anaerobic tank and a biological oxidation tank, wherein organic matters in the sewage are hydrolyzed, acidified and methanated by anaerobic bacteria in the biological anaerobic tank, and the primarily decomposed sewage is injected with oxygen and then is further purified by a microbial film in the biological oxidation tank; s3, performing sludge-water separation on the biochemical sewage by using a secondary sedimentation tank; s4, filtering the clear liquid separated from the secondary sedimentation tank through a SIC membrane filtering device, and returning the trapped liquid of the SIC membrane filtering device to the biological oxidation tank and the secondary sedimentation tank; s5, filtering clear liquid obtained by filtering with the SIC membrane filtering device by using a sulfonated polyether sulfone-removing membrane filtering device, and discharging the intercepted liquid after biochemical anaerobic treatment of the intercepted liquid of the sulfonated polyether sulfone membrane filtering device; s6, filtering the clear liquid obtained by filtering the sulfonated polyether sulfone membrane filtering device by using an RO membrane filtering device, discharging the trapped liquid of the RO membrane filtering device by simple treatment, and recycling the clear liquid obtained by filtering the RO membrane filtering device by using a collecting tank.

Compared with the prior art, the invention provides a multi-membrane sewage treatment system and a method thereof, which have the following beneficial effects:

1. the invention is provided with the sulfonated polyether sulfone membrane filtering device, and the sulfonated polyether sulfone membrane filtering device is used for carrying out filtering operation firstly after sewage biochemical treatment and before RO filtration, thereby effectively reducing the COD value in the sewage, lightening the filtering load pressure of the RO membrane, and simultaneously discharging the trapped fluid of the RO without complex post-treatment operation.

2. The invention is also provided with a SIC membrane filtering device for separating sludge from the sewage after biochemical treatment, and is also provided with a shunting device for shunting and then recovering the trapped fluid of the SIC membrane.

Drawings

FIG. 1 is a schematic view of a multi-membrane sewage treatment system.

Fig. 2 is a schematic structural diagram of the shunt device.

Wherein: 1-biological anaerobic pool; 2-a biological oxidation pond; 3-secondary sedimentation tank; 4-SIC membrane filter; 5-a first intermediate tank; 6-sulfonated polyethersulfone membrane filters; 7-a second intermediate tank; 8-RO membrane filtration unit; 9-a collection tank; 10-a high pressure pump; 11-a flow splitting device; 111-inclined chutes; 112-a first discharge opening; 113-a second discharge outlet; 114-a groove; 12-air press.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

As shown in fig. 1, the present invention provides a multi-membrane sewage treatment system comprising: the biological anaerobic tank 1, the biological oxidation tank 2, the secondary sedimentation tank 3, the SIC membrane filtering device, the sulfonated polyether sulfone membrane filtering device and the RO membrane filtering device 8 are matched, an air pressing device 12 is matched on the biological oxidation tank 2, the air pressing device 12 compresses air and injects the compressed air into the biological oxidation tank 2 from the bottom of the biological oxidation tank 2, the pretreated sewage sequentially enters the biological anaerobic tank 1, the biological oxidation tank 2, the secondary sedimentation tank 3, the SIC membrane filtering device, the sulfonated polyether sulfone membrane filtering device and the RO membrane filtering device 8 for purification operation, the biological anaerobic tank 1 is connected with the biological oxidation tank 2 through a first conveying device, the biological oxidation tank 2 is connected with the secondary sedimentation tank 3 through a second conveying device, the secondary sedimentation tank 3 is connected with the SIC membrane filtering device through a third conveying device, the SIC membrane filtering device is connected with the sulfonated polyether sulfone membrane filtering device through a fourth conveying device, the sulfonated polyether sulfone membrane filtering device is connected with the RO membrane filtering device 8 through a fifth conveying device, and the first conveying device, the second conveying device, the third conveying device, the fourth conveying device and the fifth conveying device are controlled and adjusted through a control system.

The invention is provided with a sulfonated polyether sulfone membrane filtering device, the sulfonated polyether sulfone membrane filtering device is used for carrying out filtering operation firstly after sewage is biochemically treated and before RO filtration, the COD value in the sewage is effectively reduced, the filtering load pressure of the RO membrane is lightened, meanwhile, the trapped fluid of the RO can be discharged without complex post-treatment operation, and the SIC membrane filtering device is also arranged for carrying out sludge separation on the biochemically treated sewage.

In order to improve the efficiency of sewage treatment and improve the speed of sewage passing through the SIC membrane, the sulfonated polyether sulfone membrane and the RO membrane, the third conveying device, the fourth conveying device and the fifth conveying device are respectively provided with the high-pressure pumps 10, and the SIC membrane, the sulfonated polyether sulfone membrane and the RO membrane are respectively subjected to pressure filtration operation through the three high-pressure pumps 10 so as to improve the filtration efficiency.

Because SIC membrane filtration device, sulfonated polyethersulfone membrane filtration device and RO membrane filtration device 8 are connected on a continuous production flow line, because the filtration efficiency of SIC membrane, sulfonated polyethersulfone membrane and RO membrane is inconsistent, in order to improve the overall coordination performance of the device, the SIC membrane filtration device of the invention comprises: the two ends of the SIC membrane filter 4, the first intermediate tank 5 and the third conveying device are respectively connected with the secondary sedimentation tank 3 and the SIC membrane filter 4, filtrate of the SIC membrane filter 4 is conveyed into the first intermediate tank 5 through a connecting pipe, and intercepted liquid of the SIC membrane filter 4 respectively returns to the secondary sedimentation tank 3 and the biological oxidation tank 2 through a shunting device 11; the sulfonated polyether sulfone membrane filtering device comprises: the device comprises a sulfonated polyether sulfone membrane filter 6, a second intermediate tank 7, a fourth conveying device and a third conveying device, wherein two ends of the fourth conveying device are respectively connected with a first intermediate tank 5 and the sulfonated polyether sulfone membrane filter 6, filtrate of the sulfonated polyether sulfone membrane filter 6 is conveyed into the second intermediate tank 7 through a connecting pipe, and intercepted liquid of the sulfonated polyether sulfone membrane filter 6 can reach the standard and be discharged after being subjected to biological and anaerobic removal treatment; and two ends of the fifth conveying device are respectively connected with the second intermediate tank 7 and the RO membrane filtering device 8, filtrate of the RO membrane filtering device 8 is conveyed into the collecting tank 9 through a connecting pipe, and intercepted liquid of the RO membrane filtering device 8 is simply treated and then is discharged after reaching the standard.

The trapped fluid of the SIC membrane filter 4 contains a large amount of impurities and sludge, and generally directly flows back to the biological oxidation tank 2 for discharging, but a large amount of repeated operation can be caused, and a large amount of sludge is easy to accumulate in the biological oxidation tank uniformly, so that the treatment efficiency of the secondary sedimentation tank 3 is reduced, as shown in figure 2, the invention arranges an inclined chute 111 in the flow dividing device 11, the trapped fluid of the SIC membrane filter 4 flows downwards along the chute from the top end of the inclined chute 111, the trapped fluid with lower concentration is positioned at the upper layer, the trapped fluid with higher concentration is positioned at the bottom layer, the bottom end of the inclined chute 111 is provided with a first discharge port 112 and a second discharge port 113, the first discharge port 112 is arranged on the side wall of the inclined chute 111, the second discharge port 113 is arranged at the bottom position of the inclined chute 111, the first discharge port 112 is communicated with the secondary sedimentation tank 3 through a connecting pipe, the second discharge port 113 is communicated with the biological oxidation pond 2 through a connecting pipe; the groove 114 that sets up horizontally is seted up to the tank bottom surface of slope spout 111, and groove 114 has a plurality ofly and be the echelonment and distribute along the bottom plate of slope spout 111, constantly holds back and accumulates mud impurity through groove 114, and the mud in groove 114 is cleaned out after piling up full with the mud in groove 114, avoids mud impurity repeated entering secondary sedimentation tank 3 or biological oxidation pond 2.

The invention provides a multi-membrane sewage treatment system, which is implemented according to the following steps: s1, sewage pretreatment; s2, biochemical treatment, namely, sequentially feeding the sewage into a biological anaerobic tank 1 and a biological oxidation tank 2, hydrolyzing, acidifying and methanating organic matters in the sewage in the biological anaerobic tank 1 by using anaerobic bacteria in the tanks, and further purifying the primarily decomposed sewage by using a microbial film in the biological oxidation tank 2 after injecting oxygen; s3, separating sludge and water from the biochemical sewage by using a secondary sedimentation tank 3; s4, filtering the clear liquid separated from the secondary sedimentation tank 3 through a SIC membrane filtering device, and refluxing the trapped liquid of the SIC membrane filtering device into the biological oxidation tank 2 and the secondary sedimentation tank 3; s5, filtering clear liquid obtained by filtering with the SIC membrane filtering device by using a sulfonated polyether sulfone-removing membrane filtering device, and discharging the intercepted liquid after biochemical anaerobic treatment of the intercepted liquid of the sulfonated polyether sulfone membrane filtering device; s6, filtering the clear liquid obtained by filtering the sulfonated polyether sulfone membrane filtering device by using an RO membrane filtering device 8, discharging the trapped liquid of the RO membrane filtering device 8 through simple treatment, and recycling the clear liquid obtained by filtering the clear liquid by using the RO membrane filtering device through a collecting tank 9.

It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.

It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims

1. A multi-membrane wastewater treatment system, comprising: the system comprises a biological anaerobic tank (1), a biological oxidation tank (2), a secondary sedimentation tank (3), a SIC membrane filtering device, a sulfonated polyether sulfone membrane filtering device and an RO membrane filtering device (8), wherein the pretreated sewage sequentially enters the biological anaerobic tank (1), the biological oxidation tank (2), the secondary sedimentation tank (3), the SIC membrane filtering device, the sulfonated polyether sulfone membrane filtering device and the RO membrane filtering device (8) for purification operation, the biological anaerobic tank (1) is connected with the biological oxidation tank (2) through a first conveying device, the biological oxidation tank (2) is connected with the secondary sedimentation tank (3) through a second conveying device, the secondary sedimentation tank (3) is connected with the SIC membrane filtering device through a third conveying device, the SIC membrane filtering device is connected with the sulfonated polyether sulfone membrane filtering device through a fourth conveying device, and the sulfonated polyether sulfone membrane filtering device is connected with the RO membrane filtering device (8) through a fifth conveying device, the first conveying device, the second conveying device, the third conveying device, the fourth conveying device and the fifth conveying device are controlled and adjusted through a control system.

2. The multi-membrane sewage treatment system according to claim 1, wherein an air pressing device (12) is provided on the biological oxidation tank (2), and the air pressing device (12) compresses air and injects the compressed air into the biological oxidation tank (2) from the bottom of the biological oxidation tank (2).

3. The multi-membrane sewage treatment system according to claim 1, wherein the third, fourth and fifth delivery devices are provided with high pressure pumps (10), and the SIC membrane, the sulfonated polyethersulfone membrane and the RO membrane are respectively subjected to pressure filtration operation by the three high pressure pumps (10) to improve filtration efficiency.

4. The multi-membrane sewage treatment system of claim 3 wherein the SIC membrane filtration unit comprises: the device comprises a SIC membrane filter (4) and a first intermediate tank (5), wherein two ends of the third conveying device are respectively connected with the secondary sedimentation tank (3) and the SIC membrane filter (4), filtrate of the SIC membrane filter (4) is conveyed into the first intermediate tank (5) through a connecting pipe, and intercepted liquid of the SIC membrane filter (4) is respectively refluxed into the secondary sedimentation tank (3) and the biological oxidation tank (2) through a shunting device (11).

5. The multi-membrane sewage treatment system according to claim 4 wherein the sulfonated polyethersulfone membrane filtration device comprises: the device comprises a sulfonated polyether sulfone membrane filter (6) and a second intermediate tank (7), wherein two ends of the fourth conveying device are respectively connected with the first intermediate tank (5) and the sulfonated polyether sulfone membrane filter (6), filtrate of the sulfonated polyether sulfone membrane filter (6) is conveyed into the second intermediate tank (7) through a connecting pipe, and intercepted liquid of the sulfonated polyether sulfone membrane filter (6) can be discharged in a standard after being subjected to biological and anaerobic removal treatment.

6. The multi-membrane sewage treatment system according to claim 5, wherein the fifth conveying device is connected with the second intermediate tank (7) and the RO membrane filtering device (8) at two ends respectively, the filtrate of the RO membrane filtering device (8) is conveyed to the collecting tank (9) through the connecting pipe, and the trapped fluid of the RO membrane filtering device (8) is simply treated and discharged after reaching the standard.

7. The multi-membrane sewage treatment system according to claim 4, wherein an inclined chute (111) is arranged in the flow dividing device (11), the trapped liquid of the SIC membrane filter (4) flows downwards along the inclined chute from the top end of the inclined chute (111), the trapped liquid with lower concentration is located at the upper layer, the trapped liquid with higher concentration is located at the bottom layer, a first discharge port (112) and a second discharge port (113) are arranged at the bottom end of the inclined chute (111), the first discharge port (112) is arranged on the side wall of the inclined chute (111), the second discharge port (113) is arranged at the bottom position of the inclined chute (111), the first discharge port (112) is communicated with the secondary sedimentation tank (3) through a connecting pipe, and the second discharge port (113) is communicated with the biological oxidation tank (2) through a connecting pipe.

8. The multi-membrane sewage treatment system according to claim 7, wherein the bottom surface of the inclined chute (111) is provided with a plurality of horizontally arranged grooves (114), and the grooves (114) are distributed along the bottom plate of the inclined chute (111) in a step shape.

9. The multi-membrane sewage treatment system according to any one of claims 1 to 8, wherein it is performed according to the following steps:

s1, sewage pretreatment; s2, biochemical treatment, namely, sequentially feeding the sewage into a biological anaerobic tank (1) and a biological oxidation tank (2), hydrolyzing, acidifying and methanating organic matters in the sewage in the biological anaerobic tank (1) by using anaerobic bacteria in the tank, injecting oxygen into the primarily decomposed sewage, and then further purifying the sewage through a microbial film in the biological oxidation tank (2); s3, performing sludge-water separation on the biochemical sewage by using a secondary sedimentation tank (3); s4, filtering the clear liquid separated from the secondary sedimentation tank (3) through a SIC membrane filtering device, and returning the trapped liquid of the SIC membrane filtering device to the biological oxidation tank (2) and the secondary sedimentation tank (3); s5, filtering clear liquid obtained by filtering with the SIC membrane filtering device by using a sulfonated polyether sulfone-removing membrane filtering device, and discharging the intercepted liquid after biochemical anaerobic treatment of the intercepted liquid of the sulfonated polyether sulfone membrane filtering device; s6, filtering the clear liquid obtained by filtering the sulfonated polyether sulfone membrane filtering device by using an RO membrane filtering device (8), discharging the trapped liquid of the RO membrane filtering device (8) through simple treatment, and recycling the clear liquid obtained by filtering the RO membrane filtering device through a collecting tank (9) as a clean water source.