CN112158948A - High-concentration activated sludge treatment method and system based on filter cloth sludge pre-separation - Google Patents
High-concentration activated sludge treatment method and system based on filter cloth sludge pre-separation Download PDFInfo
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- CN112158948A CN112158948A CN202011157797.8A CN202011157797A CN112158948A CN 112158948 A CN112158948 A CN 112158948A CN 202011157797 A CN202011157797 A CN 202011157797A CN 112158948 A CN112158948 A CN 112158948A
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- 239000010802 sludge Substances 0.000 title claims abstract description 192
- 239000004744 fabric Substances 0.000 title claims abstract description 131
- 238000000926 separation method Methods 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004062 sedimentation Methods 0.000 claims abstract description 61
- 239000007788 liquid Substances 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000006228 supernatant Substances 0.000 claims abstract description 13
- 238000005452 bending Methods 0.000 claims description 41
- 238000001914 filtration Methods 0.000 claims description 18
- 239000010865 sewage Substances 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 19
- 238000007599 discharging Methods 0.000 abstract 1
- 238000010992 reflux Methods 0.000 abstract 1
- 239000012528 membrane Substances 0.000 description 4
- 238000005842 biochemical reaction Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1221—Particular type of activated sludge processes comprising treatment of the recirculated sludge
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Treatment Of Sludge (AREA)
Abstract
The invention provides a high-concentration activated sludge method treatment process scheme based on filter cloth sludge pre-separation.A sewage plant enters water into a biochemical tank, mixed liquid in the biochemical tank enters a filter cloth sludge pre-separation device, part of sludge is intercepted by a filter screen and then flows back to the biochemical tank, and the mixed liquid with reduced concentration enters a sedimentation tank; and in the sedimentation tank, carrying out sludge-water separation on the mixed liquid with the reduced concentration, discharging supernatant serving as effluent, and refluxing the concentrated sludge separated by sedimentation to the biochemical tank. Even if the sludge concentration of the biochemical pool is very high, the sedimentation performance is poor, the concentration of the mixed liquid entering the sedimentation pool is reduced due to the sludge pre-separation, so that the sedimentation performance is greatly improved, and the normal operation of the sedimentation pool can be ensured, thereby stably maintaining the high-concentration activated sludge in the biochemical pool and obtaining better sewage treatment effect.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a high-concentration activated sludge method treatment method and system based on filter cloth sludge pre-separation.
Background
The biological treatment of sewage activated sludge requires sludge-water separation, generally adopting a sedimentation tank, and adopting membrane separation by MBR.
The high-concentration activated sludge method can significantly improve the sewage treatment effect, but the sludge settling performance is rapidly reduced along with the increase of the sludge concentration, so that the effective sludge-water separation is difficult to perform under the condition of a common sedimentation tank, and a biochemical system has difficulty in stably maintaining the high-concentration activated sludge.
The approaches for realizing the high-concentration activated sludge method are more, including: MBR high mud adopts membrane separation, and the method does not adopt a secondary sedimentation tank and does not depend on the sedimentation performance of the mud; the mud sand is high in mud content, and the mud sand is added into the water to improve the settling property of the mud; the magnetic powder is added into the mixed liquid to improve the sludge settling property; the SBR high mud properly prolongs the precipitation time and improves the precipitation effect; the multi-layer flat plate sedimentation tank improves the sedimentation effect; BC high mud combines chemical flocculation, improves the settling property of the mud. The method can stably maintain the high-concentration activated sludge, but has the defects of high cost, troublesome operation and the like.
In particular, the MBR membrane generally adopts an ultrafiltration membrane (dense filter medium), and the filtered water has good quality, but high price, high operation pressure and high operation cost.
The filter cloth is generally used for sludge dehydration, belongs to loose filter media, and has low operation cost due to low required operation pressure, but the water quality of filtered water is poor.
Disclosure of Invention
The technical problem solved by the invention is as follows: overcomes the defects of the prior art and provides a high-concentration activated sludge method treatment method and a high-concentration activated sludge system based on filter cloth sludge pre-separation.
In order to solve the problems, the invention discloses a high-concentration activated sludge treatment method based on filter cloth sludge pre-separation, which comprises the following steps:
the mixed liquid in the biochemical pool enters a filter cloth sludge pre-separation device;
the filter cloth sludge pre-separation device separates the mixed liquor into pre-separated sludge and low-concentration mixed liquor through filtration of the filter cloth component;
the pre-separated sludge flows back to the biochemical pool;
the low-concentration mixed liquor flows to the sedimentation tank from the filter cloth sludge pre-separation device, wherein the sedimentation tank separates the low-concentration mixed liquor into supernatant and concentrated sludge through sedimentation, and the supernatant is discharged as effluent;
and the concentrated sludge flows back to the biochemical tank.
Optionally, the concentration of activated sludge in the biochemical pond is greater than or equal to 6 g/L.
Optionally, the biochemical tank is provided with an aerobic zone and an anaerobic zone.
The invention also discloses a high-concentration activated sludge treatment system based on filter cloth sludge pre-separation, which comprises the following components: a biochemical tank, a sedimentation tank and a filter cloth sludge pre-separation device; the mixed liquid inlet of the filter cloth sludge pre-separation device is connected with the mixed liquid outlet of the biochemical pool, the pre-separation sludge outlet of the filter cloth sludge pre-separation device is connected with the pre-separation sludge inlet of the biochemical pool, the low-concentration mixed liquid outlet of the filter cloth sludge pre-separation device is connected with the low-concentration mixed liquid inlet of the sedimentation pool, the supernatant outlet of the sedimentation pool is used as a water outlet, and the concentrated sludge outlet is communicated with the concentrated sludge inlet of the biochemical pool.
Optionally, the filter cloth sludge pre-separation device comprises: the filter cloth component divides the box body into an upper half area and a lower half area from top to bottom, the mixed liquid inlet is formed in the inlet of the lower half area, the pre-separation sludge outlet is formed in the outlet of the lower half area, and the low-concentration mixed liquid outlet is formed in the outlet of the upper half area.
Optionally, the filter cloth assembly comprises a first bending frame and a second bending frame which are symmetrically arranged, the first bending frame and the second bending frame are connected through a connecting piece, first filter cloth is tightly arranged between the first bending frame and the second bending frame, the first bending frame and the second bending frame are connected with the inner wall of the box body through loose second filter cloth, and the first filter cloth and the second filter cloth jointly form a partition surface of an upper half area and a lower half area.
Optionally, the filter cloth sludge pre-separation device further comprises a vibration device for driving the first bending frame and the second bending frame to vibrate.
Optionally, the vibration device includes a vibrator and at least one elastic component, the first bending frame and the second bending frame are connected through two first connecting rods, the two first connecting rods are connected through a second connecting rod, the vibrator is installed on the first connecting rod or the second connecting rod, one end of the elastic component is fixedly installed on the top surface of the box body, and the other end of the elastic component is fixedly installed on the first connecting rod and/or the second connecting rod.
Optionally, a water suction pump is arranged at the joint of the pre-separation sludge outlet and the pre-separation sludge inlet of the biochemical pool.
Optionally, the pre-separated sludge outlet is suspended above the pre-separated sludge inlet of the biochemical pool.
Compared with the prior art, the invention has the following advantages:
the invention provides a high-concentration activated sludge method treatment scheme based on filter cloth sludge pre-separation.A sewage plant enters water into a biochemical tank, mixed liquid in the biochemical tank enters a filter cloth sludge pre-separation device, part of sludge is intercepted by a filter screen and then flows back to the biochemical tank, and the mixed liquid with reduced concentration enters a sedimentation tank; in the sedimentation tank, the mixed liquid with the reduced concentration is subjected to mud-water separation, the supernatant is discharged as effluent, the concentrated sludge obtained by sedimentation and separation flows back to the biochemical tank, the sludge obtained by pre-separation from the filter cloth sludge pre-separation device and the sludge obtained by sedimentation and separation are mixed and flow back to the biochemical tank for biochemical reaction, so that high-concentration activated sludge can be stably maintained in the biochemical tank, and a better sewage treatment effect is obtained. Even if the sludge concentration of the biochemical pool is very high, the sedimentation performance is poor, the concentration of the mixed liquid entering the sedimentation pool is reduced due to the sludge pre-separation, so that the sedimentation performance is greatly improved, and the normal operation of the sedimentation pool can be ensured, thereby stably maintaining the high-concentration activated sludge in the biochemical pool and obtaining better sewage treatment effect.
The filter cloth form of the sludge pre-separation device is divided up and down, the self gravity of the sludge is fully utilized, the sludge concentration in the mixed liquid which upwards passes through the filter cloth is ensured to be kept at a lower level, and the filtering effect is improved.
The filter cloth subassembly adopts the structure of the frame of bending, and the filter cloth of tensioning can effectively increase the effective filtration area of filter cloth between the cooperation frame, has doubly enlarged the filter cloth area in limited space, has realized high-efficient filtration, has reduced the risk that mud blockked up the filter cloth under the unchangeable condition of flow velocity. In addition, because the filtering area is increased, the treatment system can adapt to higher flow velocity, and the sewage treatment efficiency is improved.
A vibrator is arranged on a filter cloth component in the filter cloth sludge pre-separation device, and the vibrator vibrates to promote a sludge layer attached to the filter cloth to fall off, so that the filtering performance of the filter cloth is kept. The structural design of this filter cloth subassembly can satisfy the filtration demand of keeping apart from top to bottom, can realize the vibration function again, and structural design is reasonable, with low costs.
Drawings
FIG. 1 is a flow chart illustrating the steps of a method for treating high-concentration activated sludge based on pre-separation of filter cloth sludge according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a high concentration activated sludge process treatment system based on pre-separation of filter cloth sludge according to a second embodiment of the present invention;
FIG. 3 is a front view of a cloth sludge preseparator according to a second embodiment of the present invention;
FIG. 4 is a top view of a cloth sludge preseparator according to a second embodiment of the present invention.
In the figure, 1, a biochemical pool; 2, a sedimentation tank; 3, a filter cloth sludge pre-separation device; 4, a mixed liquid inlet; 5, a pre-separation sludge outlet; 6, a low-concentration mixed solution outlet; 7, a box body; 8, a filter cloth component; 9, a first bending frame; 10, a second bending frame; 11, a connecting piece; 12, a first filter cloth; 13, a second filter cloth; 14, a vibration device; 15, a vibrator; 16, an elastic component.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, a flow chart of the steps of a high-concentration activated sludge method treatment method based on filter cloth sludge pre-separation is shown.
The high-concentration activated sludge treatment method based on filter cloth sludge pre-separation provided by the embodiment of the invention comprises the following steps:
step 101: and the mixed liquid in the biochemical pool enters a filter cloth sludge pre-separation device.
In order to ensure the activity of the activated sludge in the biochemical tank and maintain the sewage treatment effect, the biochemical tank is provided with an aerobic zone and an anaerobic zone, and the concentration of the activated sludge in the biochemical tank is ensured to be more than or equal to 6 g/L.
Step 102: the filter cloth sludge pre-separation device separates the mixed liquid into pre-separated sludge and low-concentration mixed liquid.
The filter cloth sludge pre-separation device is internally provided with a filter cloth component, and the mixed liquid is filtered by the filter cloth component to be filtered into pre-separated sludge and low-concentration mixed liquid.
Step 103: the pre-separated sludge flows back to the biochemical pool.
Step 104: and the low-concentration mixed liquor flows to the sedimentation tank from the pre-separation device.
The mixed liquid with low concentration flows into the sedimentation tank, so that the sedimentation capacity of the sedimentation tank is improved, and the normal operation of the sedimentation tank can be ensured.
The sludge separated and separated from the filter cloth sludge pre-separation device flows back to the biochemical tank, so that the high-concentration activated sludge in the biochemical tank is ensured to be maintained.
Wherein, the sedimentation tank separates the low-concentration mixed liquid into supernatant and concentrated sludge through sedimentation, and the supernatant is discharged as effluent.
Step 105: the concentrated sludge flows back to the biochemical tank.
And the concentrated sludge precipitated in the sedimentation tank flows back to the biochemical tank, so that the high-concentration activated sludge in the biochemical tank is further stabilized, and the sewage treatment effect is further enhanced.
The invention provides a high-concentration activated sludge method treatment method based on filter cloth sludge pre-separation.A sewage plant enters water into a biochemical tank, mixed liquid in the biochemical tank enters a filter cloth sludge pre-separation device, part of sludge is intercepted by a filter screen and then flows back to the biochemical tank, and the mixed liquid with reduced concentration enters a sedimentation tank; in the sedimentation tank, the mixed liquid with the reduced concentration is subjected to mud-water separation, the supernatant is discharged as effluent, the concentrated sludge obtained by sedimentation and separation flows back to the biochemical tank, the sludge obtained by pre-separation from the filter cloth sludge pre-separation device and the sludge obtained by sedimentation and separation are mixed and flow back to the biochemical tank for biochemical reaction, so that high-concentration activated sludge can be stably maintained in the biochemical tank, and a better sewage treatment effect is obtained. Even if the sludge concentration of the biochemical pool is very high, the sedimentation performance is poor, the concentration of the mixed liquid entering the sedimentation pool is reduced due to the sludge pre-separation, so that the sedimentation performance is greatly improved, and the normal operation of the sedimentation pool can be ensured, thereby stably maintaining the high-concentration activated sludge in the biochemical pool and obtaining better sewage treatment effect.
Example two
Referring to fig. 2, a schematic diagram of a high-concentration activated sludge process treatment system based on filter cloth sludge pre-separation in the second embodiment of the invention is shown.
High concentration activated sludge process processing system based on filter cloth mud is preliminary separation includes: a biochemical tank 1, a sedimentation tank 2 and a filter cloth sludge pre-separation device 3; the mixed liquid inlet 4 of the filter cloth sludge pre-separation device 3 is connected with the mixed liquid outlet of the biochemical pool 1, the pre-separation sludge outlet 5 of the filter cloth sludge pre-separation device 3 is connected with the pre-separation sludge inlet of the biochemical pool 1, the low-concentration mixed liquid outlet 6 of the filter cloth sludge pre-separation device 3 is connected with the low-concentration mixed liquid inlet 4 of the sedimentation pool 2, the supernatant outlet of the sedimentation pool 2 is used as a water outlet, and the concentrated sludge outlet is communicated with the concentrated sludge inlet of the biochemical pool 1.
As shown in fig. 3 and 4, the filter cloth sludge pre-separation apparatus 3 includes: the device comprises a box body 7 and a filter cloth component 8, wherein the filter cloth component 8 divides the box body 7 into an upper half area and a lower half area from top to bottom, a mixed liquid inlet 4 is formed in an inlet of the lower half area, a pre-separation sludge outlet 5 is formed in an outlet of the lower half area, and a low-concentration mixed liquid outlet 6 is formed in an outlet of the upper half area.
The filter cloth component 8 comprises a first bending frame and a second bending frame which are symmetrically arranged, the first bending frame and the second bending frame are connected through a connecting piece 11, first filter cloth 12 is tightly arranged between the first bending frame and the second bending frame, the first bending frame and the second bending frame are connected with the inner wall of the box body 7 through loose second filter cloth 13, and the first filter cloth 12 and the second filter cloth 13 jointly form a partition surface of an upper half area and a lower half area.
The filter cloth subassembly includes that first frame and the second of buckling buckle the frame, and the first filter cloth that tightens between first frame and the second of bending is provided with between the frame, increase sewage filter area to promote filterable efficiency, mix the liquid and filter through multilayer filter cloth, must can strengthen the filter effect.
The filter cloth sludge pre-separation device 3 further comprises a vibration device 14 for driving the first bending frame and the second bending frame to vibrate.
The vibrating device 14 comprises a vibrator 15 and at least one elastic component 16, the first bending frame and the second bending frame are connected through two first connecting rods, the two first connecting rods are connected through a second connecting rod, the vibrator 15 is installed on the first connecting rod or the second connecting rod, one end of the elastic component 16 is fixedly installed on the top surface of the box body 7, and the other end of the elastic component is fixedly installed on the first connecting rod and/or the second connecting rod.
First filter cloth and second filter cloth divide into two intervals about with the box, have guaranteed filterable leakproofness, and the second filter cloth is connected with the inner wall lax of first frame, the second frame and the box of buckling, then when guaranteeing to filter the leakproofness, can not hinder vibrating device's vibration, influences the effect of shaking off to the mud on the filter cloth subassembly.
The working part of the vibration device is a rod-shaped hollow cylinder, an eccentric vibrator is arranged in the vibration device, the vibration device is driven by a motor to rotate at a high speed to generate high-frequency micro-amplitude vibration, and the vibration frequency can reach 12000-15000 times/min.
In order to guarantee the filterable efficiency of the mixed liquid of filter cloth subassembly in to biochemical pond, need guarantee that the filtration pore of filtering cloth subassembly keeps unobstructed, because contain impurity such as earth in the mixed liquid of biochemical pond, impurity in the mixed liquid can adhere to on the filtration pore of filtering cloth subassembly at filterable in-process, lead to the filter effect variation, when vibrating device vibrates, can drive the filter cloth subassembly and vibrate, thereby will adhere to the impurity shake off on the filter cloth subassembly, thereby improve filterable effect.
And a water pump is arranged at the joint of the pre-separation sludge outlet 5 and the pre-separation sludge inlet of the biochemical pool 1.
The mixed liquid inlet, the pre-separation sludge outlet and the biochemical pool form a water flow loop. The mixed liquid inlet of the filter cloth sludge pre-separation device is connected with the biochemical pool, and sewage in the biochemical pool enters from the mixed liquid inlet of the filter cloth sludge pre-separation device and is filtered by the filter cloth component and the vibration device.
The pre-separation sludge outlet 5 is suspended above the pre-separation sludge inlet of the biochemical pool 1.
The invention provides a high-concentration activated sludge method treatment scheme based on filter cloth sludge pre-separation.A sewage plant enters water into a biochemical tank, mixed liquid in the biochemical tank enters a filter cloth sludge pre-separation device, part of sludge is intercepted by a filter screen and then flows back to the biochemical tank, and the mixed liquid with reduced concentration enters a sedimentation tank; in the sedimentation tank, the mixed liquid with the reduced concentration is subjected to mud-water separation, the supernatant is discharged as effluent, the concentrated sludge obtained by sedimentation and separation flows back to the biochemical tank, the sludge obtained by pre-separation from the filter cloth sludge pre-separation device and the sludge obtained by sedimentation and separation are mixed and flow back to the biochemical tank for biochemical reaction, so that high-concentration activated sludge can be stably maintained in the biochemical tank, and a better sewage treatment effect is obtained. Even if the sludge concentration of the biochemical pool is very high, the sedimentation performance is poor, the concentration of the mixed liquid entering the sedimentation pool is reduced due to the sludge pre-separation, so that the sedimentation performance is greatly improved, and the normal operation of the sedimentation pool can be ensured, thereby stably maintaining the high-concentration activated sludge in the biochemical pool and obtaining better sewage treatment effect.
The filter cloth form of the sludge pre-separation device is divided up and down, the self gravity of the sludge is fully utilized, the sludge concentration in the mixed liquid which upwards passes through the filter cloth is ensured to be kept at a lower level, and the filtering effect is improved.
The filter cloth subassembly adopts the structure of the frame of bending, and the filter cloth of tensioning can effectively increase the effective filtration area of filter cloth between the cooperation frame, has doubly enlarged the filter cloth area in limited space, has realized high-efficient filtration, has reduced the risk that mud blockked up the filter cloth under the unchangeable condition of flow velocity. In addition, because the filtering area is increased, the treatment system can adapt to higher flow velocity, and the sewage treatment efficiency is improved.
A vibrator is arranged on a filter cloth component in the filter cloth sludge pre-separation device, and the vibrator vibrates to promote a sludge layer attached to the filter cloth to fall off, so that the filtering performance of the filter cloth is kept. The structural design of this filter cloth subassembly can satisfy the filtration demand of keeping apart from top to bottom, can realize the vibration function again, and structural design is reasonable, with low costs.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The method and the system for treating high-concentration activated sludge based on pre-separation of filter cloth sludge provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A high-concentration activated sludge treatment method based on filter cloth sludge pre-separation is characterized by comprising the following steps:
the mixed liquid in the biochemical pool enters a filter cloth sludge pre-separation device;
the filter cloth sludge pre-separation device separates the mixed liquor into pre-separated sludge and low-concentration mixed liquor through filtration of the filter cloth component;
the pre-separated sludge flows back to the biochemical pool;
the low-concentration mixed liquor flows to the sedimentation tank from the filter cloth sludge pre-separation device, wherein the sedimentation tank separates the low-concentration mixed liquor into supernatant and concentrated sludge through sedimentation, and the supernatant is discharged as effluent;
and the concentrated sludge flows back to the biochemical tank.
2. The method for treating high-concentration activated sludge based on filter cloth sludge pre-separation according to claim 1, wherein the concentration of activated sludge in the biochemical pond is greater than or equal to 6 g/L.
3. The method for treating high-concentration activated sludge based on filter cloth sludge pre-separation as claimed in claim 1, wherein the biochemical tank is provided with an aerobic zone and an anaerobic zone.
4. A high-concentration activated sludge process treatment system based on filter cloth sludge pre-separation is characterized by comprising: a biochemical tank, a filter cloth sludge pre-separation device and a sedimentation tank;
the mixed liquid inlet of the filter cloth sludge pre-separation device is connected with the mixed liquid outlet of the biochemical pool, the pre-separation sludge outlet of the filter cloth sludge pre-separation device is connected with the pre-separation sludge inlet of the biochemical pool, the low-concentration mixed liquid outlet of the filter cloth sludge pre-separation device is connected with the low-concentration mixed liquid inlet of the sedimentation pool, the supernatant outlet of the sedimentation pool is used as a water outlet, and the concentrated sludge outlet is communicated with the concentrated sludge inlet of the biochemical pool.
5. The high-concentration activated sludge process treatment system based on filter cloth sludge pre-separation as claimed in claim 1, wherein the filter cloth sludge pre-separation device comprises: the filter cloth component divides the box body into an upper half area and a lower half area from top to bottom, the mixed liquid inlet is formed in the inlet of the lower half area, the pre-separation sludge outlet is formed in the outlet of the lower half area, and the low-concentration mixed liquid outlet is formed in the outlet of the upper half area.
6. The high-concentration activated sludge treatment system based on filter cloth sludge pre-separation as claimed in claim 5, wherein the filter cloth assembly comprises a first bending frame and a second bending frame which are symmetrically arranged, the first bending frame and the second bending frame are connected through a connecting piece, a first filter cloth is tightly stretched between the first bending frame and the second bending frame, the first bending frame, the second bending frame and the inner wall of the box body are connected through a loose second filter cloth, and the first filter cloth and the second filter cloth jointly form a separation surface of an upper half area and a lower half area.
7. The high-concentration activated sludge process treatment system based on filter cloth sludge pre-separation as claimed in claim 6, wherein the filter cloth sludge pre-separation device further comprises a vibration device for driving the first bending frame and the second bending frame to vibrate.
8. The high-concentration activated sludge process treatment system based on filter cloth sludge pre-separation as claimed in claim 7, wherein the vibration device comprises a vibrator and at least one elastic component, the first bending frame and the second bending frame are connected through two first connecting rods, the two first connecting rods are connected through a second connecting rod, the vibrator is mounted on the first connecting rod or the second connecting rod, one end of the elastic component is fixedly mounted on the top surface of the box body, and the other end of the elastic component is fixedly mounted on the first connecting rod and/or the second connecting rod.
9. The high-concentration activated sludge process treatment system based on filter cloth sludge pre-separation as claimed in claim 4, wherein a water suction pump is arranged at the joint of the pre-separation sludge outlet and the pre-separation sludge inlet of the biochemical pond.
10. The high-concentration activated sludge process treatment system based on filter cloth sludge pre-separation as claimed in claim 1, wherein the pre-separation sludge outlet is suspended above the pre-separation sludge inlet of the biochemical pond.
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