Sewage treatment system matched with production of ethylene oxide and ethylene glycol

Abstract

The invention relates to the field of ethylene oxide and ethylene glycol production sewage treatment, and discloses an ethylene oxide and ethylene glycol production matched sewage treatment system which comprises a low-salt wastewater treatment system (10), a high-salt wastewater treatment system (20) and a reclaimed water recycling system (30), sewage treated by the low-salt wastewater treatment system (10) and the high-salt wastewater treatment system (20) passes through the reclaimed water recycling system (30), so that sewage treatment and cyclic utilization are realized; the sewage treatment system not only can treat low-salt wastewater and high-salt wastewater at the same time, but also realizes reuse of clear water at multiple positions in the treatment process, saves water and reduces emission, and the operation cost is reduced; the sewage treatment efficiency is high, and the operation is stable.

Description

Technical Field

[0001] The invention relates to the field of wastewater treatment in the production of ethylene oxide and ethylene glycol, and in particular to a wastewater treatment system for supporting the production of ethylene oxide and ethylene glycol. Background Art

[0002] Ethylene glycol and ethylene oxide (EO and EG) are important raw materials for chemical fiber enterprises to produce polyester. The main production technologies of ethylene oxide / ethylene glycol include ethylene oxidation, which uses ethylene and oxygen as raw materials to generate ethylene oxide EO through oxidation reaction, and ethylene oxide EO is converted into ethylene glycol EG through traditional hydration process or catalytic hydrolysis process. A large amount of sewage is continuously discharged during its production process. The sewage has a high concentration of organic matter, a high pH value, and a large fluctuation range of water quality; the concentration of dissolved solids is low; it basically does not contain biological toxic pollutants, and the BOD to COD ratio is between 0.4 and 0.6, which is more suitable for biochemical treatment and reuse.

[0003] Existing technologies include a Chinese invention patent with application number CN201120138628.X, which discloses an ethylene glycol wastewater treatment device, which is mainly composed of a water collection well, a hydrolysis acidification tank, a biological fluidized bed reactor, a water purifier and a clear water tank. The device of this invention has low investment and low operating costs, but low processing capacity and unstable operation. From the perspective of technological development trends and occupational safety and health, how to reduce wastewater discharge, reduce corporate production costs, improve the operating environment of sewage treatment processes, and improve the operating stability of treatment devices has become an urgent problem for chemical companies. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a sewage treatment system for the production of ethylene oxide and ethylene glycol, which can not only treat low-salt wastewater and high-salt wastewater at the same time, but also realize the reuse of clean water in multiple places during the treatment process, save water and reduce emissions, and reduce operating costs; and the sewage treatment efficiency is high and the operation is stable.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A sewage treatment system for ethylene oxide and ethylene glycol production includes a low-salt sewage treatment system, a high-salt sewage treatment system and a reclaimed water reuse system. The sewage treated by the low-salt sewage treatment system and the high-salt sewage treatment system passes through the reclaimed water reuse system to achieve sewage treatment and recycling.

[0007] Preferably, the low-salt wastewater treatment system comprises a low-salt regulating tank, a biological selection tank, a low-salt ASR tank, a low-salt CBR tank and a low-salt secondary sedimentation tank connected in sequence, the effluent from the low-salt secondary sedimentation tank is connected to a high-efficiency clarification tank, and the sludge at the bottom of the low-salt secondary sedimentation tank is connected to a sludge return tank to achieve low-salt wastewater treatment.

[0008] Preferably, the effluent from the high-efficiency clarification tank is connected to a reuse water tank, and the effluent from the reuse water tank is connected to a reclaimed water reuse system; the sludge at the bottom of the high-efficiency clarification tank is connected to other sludge tanks through a pipeline, and the sludge return tank is connected to a biological selection tank or other sludge tanks through a pump body to reuse or discharge the sludge.

[0009] Preferably, the high-salt wastewater treatment system comprises a waste alkali liquid tank, a high-salt regulating tank, an anoxic tank, a high-salt CBR tank, a high-salt ASR tank and a high-salt secondary sedimentation tank connected in sequence, and the high-salt secondary sedimentation tank is connected to a final sedimentation tank to achieve high-salt wastewater treatment.

[0010] Preferably, the effluent from the final sedimentation tank is connected to the ozone reaction tank, the high-salt post-CBR tank and the discharge tank in sequence; the effluent from the discharge tank is connected to the outlet of the sewage treatment plant so as to be discharged after the effluent is tested to be qualified; the sludge at the bottom of the final sedimentation tank is connected to other sludge tanks through a pipeline so that the effluent can be reused or the sludge can be discharged through other sludge tanks.

[0011] Preferably, the ozone reaction tank comprises at least three tank bodies, and a first circulating water device is provided between adjacent tank bodies and between a tank body close to the final sedimentation tank and the final sedimentation tank to achieve sewage circulation treatment between the tank bodies.

[0012] Preferably, the grey water reuse system comprises a grey water regulating tank, a hardness removal sedimentation tank, an ozone inlet tank, an ozone contact tank and a grey water post-CBR tank which are connected in sequence, the grey water post-CBR tank is connected to an RO membrane treatment tank, the fresh water produced by the RO membrane treatment tank is reused in a low-salt wastewater treatment system, the concentrated water produced by the RO membrane treatment tank is connected to a RO concentrated water hardness removal tank, the effluent from the RO concentrated water hardness removal tank is reused in a high-salt wastewater treatment system, and the bottom sludge is connected to a hardness removal sludge tank.

[0013] Preferably, the ozone contact tank comprises at least three tank bodies, and a second circulating water device is provided between adjacent tank bodies and between the tank body close to the ozone water inlet tank and the ozone water inlet tank to achieve sewage circulation treatment between the tank bodies.

[0014] Preferably, the effluent from the hard sludge removal pool is connected to other sludge pools so that the effluent can be reused or the sludge can be discharged through other sludge pools; the sludge at the bottom of the hard sludge removal pool is connected to a plate and frame filter press through a pump body so that the sludge can be dehydrated and discharged; the filtered water from the plate and frame filter press is connected to a filtrate pool, and the effluent from the filtrate pool is reused to a reclaimed water reuse system.

[0015] Preferably, the effluent from the other sludge pools is connected to a water collection pool, and the effluent from the water collection pool is reused in a reclaimed water reuse system. The bottom sludge is connected to a screw stacker through a pump body to dehydrate the sludge and discharge it externally; the filtered water from the screw stacker is connected to a filtrate pool, and the effluent from the filtrate pool is reused in a reclaimed water reuse system.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The sewage treatment system of the present invention can not only treat low-salt wastewater and high-salt wastewater at the same time, but also realize the reuse of clean water in multiple places during the treatment process, save water and reduce emissions, and reduce operating costs; and the sewage treatment efficiency is high and the operation is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the overall flow chart of this sewage treatment system.

[0019] Figure 2 This is a flow chart of the low-salt wastewater treatment system in this sewage treatment system.

[0020] Figure 3 This is the partial process of the low-salt wastewater treatment system in this sewage treatment system Figure 1 .

[0021] Figure 4 This is the partial process of the low-salt wastewater treatment system in this sewage treatment system Figure 2 .

[0022] Figure 5 This is the partial process of the low-salt wastewater treatment system in this sewage treatment system Figure 3 .

[0023] Figure 6 This is a flow chart of the high-salt wastewater treatment system in this sewage treatment system.

[0024] Figure 7 This is the partial process of the high-salt wastewater treatment system in this sewage treatment system Figure 1 .

[0025] Figure 8 This is the partial process of the high-salt wastewater treatment system in this sewage treatment system Figure 2 .

[0026] Fig. 9 This is the partial process of the high-salt wastewater treatment system in this sewage treatment system Figure 3 .

[0027] Fig.10 This is a flow chart of the grey water reuse system in this sewage treatment system.

[0028] Fig.11 This is the partial process of the water reuse system in this sewage treatment system Figure 1 .

[0029] Fig.12 This is the partial process of the water reuse system in this sewage treatment system Figure 2 .

[0030] Fig.13 This is the partial process of the water reuse system in this sewage treatment system Figure 3 .

[0031] Fig.14 This is a flow chart of the sludge treatment part of this sewage treatment system.

[0032] In the attached drawings: 10-low-salt wastewater treatment system, 11-low-salt regulating tank, 12-biological selection tank, 13-low-salt ASR tank, 14-low-salt CBR tank, 15-low-salt secondary sedimentation tank, 16-high-efficiency clarification tank, 161-partition, 162-first filter assembly, 163-effluent weir, 17-sludge return tank, 18-recycled water tank;

[0033] 20-high-salt wastewater treatment system, 21-waste alkali liquid tank, 22-high-salt regulating tank, 221-sludge suction device, 23-anoxic tank, 24-high-salt CBR tank, 25-high-salt ASR tank, 26-high-salt secondary sedimentation tank, 27-final sedimentation tank, 271-coagulation reaction zone, 272-sedimentation zone, 273-effluent zone, 28-ozone reaction tank, 281-first circulating water equipment, 29-high-salt post-CBR tank, 291-discharge tank;

[0034] 30-recycled water reuse system, 31-recycled water regulating tank, 32-hardness removal sedimentation tank, 321-second filtration component, 33-ozone inlet tank, 34-ozone contact tank, 35-recycled water post-CBR tank, 36-RO membrane treatment tank, 361-recycled water inlet tank, 362-ultrafiltration water production tank, 363-RO water production tank, 37-RO concentrated water hardness removal tank;

[0035] 4-other sludge tanks, 5-hard sludge removal tanks, 6-plate and frame filter presses, 7-filtrate tanks, 8-water collection tanks, 9-screw stacking machines. DETAILED DESCRIPTION

[0036] Embodiment 1: A preferred embodiment of the present invention provides a wastewater treatment system for supporting the production of ethylene oxide and ethylene glycol, including a low-salt wastewater treatment system 10, a high-salt wastewater treatment system 20 and a reclaimed water reuse system 30. The wastewater treated by the low-salt wastewater treatment system 10 and the high-salt wastewater treatment system 20 passes through the reclaimed water reuse system 30 to achieve wastewater treatment and recycling.

[0037] Embodiment 2: A preferred embodiment of the present invention provides a wastewater treatment system for ethylene oxide and ethylene glycol production, which differs from the above embodiment only in that:

[0038] The low-salt wastewater treatment system 10 includes a low-salt regulating tank 11, a biological selection tank 12, a low-salt ASR tank 13, a low-salt CBR tank 14 and a low-salt secondary sedimentation tank 15 which are connected in sequence. The effluent of the low-salt secondary sedimentation tank 15 is connected to a high-efficiency clarification tank 16, and the sludge at the bottom of the low-salt secondary sedimentation tank 15 is connected to a sludge return tank 17 to achieve low-salt wastewater treatment; the effluent of the high-efficiency clarification tank 16 is connected to a reuse water tank 18, and the effluent of the reuse water tank 18 is connected to a reclaimed water reuse system 30; the sludge at the bottom of the high-efficiency clarification tank 16 is connected to other sludge tanks 4 through a pipeline, and the sludge return tank 17 is connected to the biological selection tank 12 or other sludge tanks 4 through a pump body to reuse or discharge the sludge.

[0039] The high-efficiency clarification tank 16 includes a plurality of groups of stirring tanks and clarification tanks connected in sequence. The sludge at the bottom of the two groups of stirring tanks at the last position is connected to other sludge tanks 4 through pipelines, so that the remaining sludge is centrally processed after the sewage is stirred and clarified in sequence. The clarification tank is connected to the adjacent stirring tank through two groups of parallel partitions 161. The partition 161 adjacent to the stirring tank is provided with a lower water outlet, and the partition 161 adjacent to the clarification tank is provided with an upper water outlet, so that the clean water stirred and clarified in the stirring tank enters the clarification tank from the upper water outlet. A first filter assembly 162 is provided above the clarification tank, and the filtered water above the first filter assembly 162 is connected to a water outlet weir 163, so that the clean water above the clarification tank is filtered and reused; the water outlet of the water outlet weir 163 is connected to the reuse water tank 18, and the water outlet of the reuse water tank 18 is connected to the reclaimed water reuse system 30.

[0040] The effluent of the other sludge pool 4 is connected to the water collection pool 8, and the effluent of the water collection pool 8 is reused in the reclaimed water reuse system 30. The sludge at the bottom is connected to the screw stacking machine 9 through a pump body to dehydrate the sludge and then discharge it. The filtered water of the screw stacking machine 9 is connected to the filtrate pool 7, and the effluent of the filtrate pool 7 is reused in the reclaimed water reuse system 30 to reuse the filtered water.

[0041] Embodiment 3: A preferred embodiment of the present invention provides a wastewater treatment system for ethylene oxide and ethylene glycol production, which differs from the above embodiment only in that:

[0042] The high-salt wastewater treatment system 20 includes a waste alkali liquid pool 21, a high-salt regulating pool 22, an anoxic pool 23, a high-salt CBR pool 24, a high-salt ASR pool 25 and a high-salt secondary sedimentation pool 26 which are connected in sequence. The high-salt secondary sedimentation pool 26 is connected to a final sedimentation pool 27 to achieve high-salt wastewater treatment.

[0043] The high-salt regulating tank 22 is provided with a sludge suction device 221, and the sludge suction device 221 is connected to other sludge tanks 4 to recycle the high-salt sludge.

[0044] The effluent from the final sedimentation tank 27 is connected to the ozone reaction tank 28, the high-salt post-CBR tank 29 and the discharge tank 291 in sequence. The effluent from the discharge tank 291 is connected to the outlet of the sewage treatment plant to be discharged after the effluent is tested to be qualified; the sludge at the bottom of the final sedimentation tank 27 is connected to other sludge tanks 4 through pipelines, so that the effluent can be reused or the sludge can be discharged through other sludge tanks 4.

[0045] The final sedimentation tank 27 includes a coagulation reaction zone 271, a sedimentation zone 272 and an outlet zone 273. The top clear water of the coagulation reaction zone 271 is connected to the sedimentation zone 272, the top clear water of the sedimentation zone 272 is connected to the outlet zone 273, and the bottom sludge of the sedimentation zone 272 is connected to other sludge pools 4 to discharge the sludge through other sludge pools 4. The outlet water of the sedimentation zone 272 is connected to the ozone reaction tank 28, the high-salt post-CBR tank 29 and the discharge tank 291 in sequence, and the outlet water of the discharge tank 291 is connected to the outlet of the sewage treatment plant to be discharged after passing the test.

[0046] The ozone reaction tank 28 includes at least three tank bodies, and first circulating water equipment 281 is provided between adjacent tank bodies and between the tank body close to the final settling tank 27 and the final settling tank 27 to achieve sewage circulation treatment between the tank bodies.

[0047] The effluent from the other sludge pools 4 is connected to the water collection pool 8, and the effluent from the water collection pool 8 is reused in the reclaimed water reuse system 20. The bottom sludge is connected to the screw stacking machine 9 through a pump body to dehydrate the sludge and then discharge it externally; the filtered water from the screw stacking machine 9 is connected to the filtrate pool 7, and the effluent from the filtrate pool 7 is reused in the reclaimed water reuse system 20 to reuse the filtered water.

[0048] Embodiment 4: A preferred embodiment of the present invention provides a wastewater treatment system for ethylene oxide and ethylene glycol production, which differs from the above embodiments only in that:

[0049] The reclaimed water reuse system 30 includes a reclaimed water regulating tank 31, a hardness removal sedimentation tank 32, an ozone water inlet tank 33, an ozone contact tank 34 and a reclaimed water post-CBR tank 35 which are connected in sequence. The reclaimed water post-CBR tank 35 is connected to an RO membrane treatment tank 36. The RO membrane treatment tank 36 produces fresh water which is reused in the low-salt wastewater treatment system 10. The RO membrane treatment tank 36 produces concentrated water which is connected to an RO concentrated water de-hardening tank 37. The effluent from the RO concentrated water de-hardening tank 37 is reused in the high-salt wastewater treatment system 20, and the bottom sludge is connected to a de-hardening sludge tank 5.

[0050] The hardness removal sedimentation tank 32 includes multiple groups of stirring tanks and clarification tanks connected in sequence, and a second filter component 321 is provided on the top of the clarification tank, and the water outlet above the second filter component 321 is connected to the ozone inlet tank 33; the RO concentrated water hardness removal tank 37 includes a RO coagulation reaction area 371 and a RO concentrated water sedimentation area 372, and a third filter component 373 is provided on the RO concentrated water sedimentation area 372, and the water outlet above the third filter component 373 is connected to the high-salt wastewater treatment system 20.

[0051] The RO membrane treatment tank 36 includes a recycled water inlet tank 361, an ultrafiltration water production tank 362 and an RO water production tank 363 which are connected in sequence. The effluent from the recycled water inlet tank 361 is sequentially filtered through sand, ultrafiltration and RO membrane to produce concentrated water which is connected to the RO concentrated water de-hardening tank 37. The ultrafiltration produces fresh water which enters the ultrafiltration water production tank 362. The RO membrane produces fresh water which enters the RO water production tank 363. The fresh water is reused or reused to the low-salt wastewater treatment system 10.

[0052] The sludge at the bottom of the stirring tank, clarification tank and RO concentrated water settling area 372 is connected to the hard sludge removal tank 5 to remove the hardness in the water; the effluent of the hard sludge removal tank 5 is connected to the water collection tank 8, and the water collection tank 8 is connected to the reclaimed water regulating tank 31; the sludge at the bottom of the hard sludge removal tank 5 is connected to the plate-frame filter press 6 through the pump body to dehydrate the sludge and then discharge it. The filtered water of the plate-frame filter press 6 is connected to the filtrate tank 7, and the effluent of the filtrate tank 7 is reused in the reclaimed water regulating tank 31.

[0053] The ozone contact tank 34 includes at least three tank bodies, and second circulating water equipment 341 is provided between adjacent tank bodies and between the tank body close to the ozone water inlet tank 33 and the ozone water inlet tank 33 to achieve sewage circulation treatment between the tank bodies.

[0054] The effluent from the hard sludge removal tank 5 is connected to other sludge tanks 4 so that the effluent can be reused or the sludge can be discharged through other sludge tanks 4. The sludge at the bottom of the hard sludge removal tank 5 is connected to the plate and frame filter press 6 through a pump body so that the sludge can be dehydrated and discharged; the filtered water from the plate and frame filter press 6 is connected to the filtrate tank 7, and the effluent from the filtrate tank 7 is reused to the reclaimed water reuse system 30.

[0055] The effluent from the other sludge pools 4 is connected to the water collection pool 8, and the effluent from the water collection pool 8 is reused in the reclaimed water reuse system 30. The sludge at the bottom is connected to the screw stacking machine 9 through a pump body to dehydrate the sludge and then discharge it externally; the filtered water from the screw stacking machine 9 is connected to the filtrate pool 7, and the effluent from the filtrate pool 7 is reused in the reclaimed water reuse system 30.

[0056] This sewage treatment system can not only treat low-salt wastewater and high-salt wastewater at the same time, but also realize the reuse of clean water in multiple places during the treatment process, save water and reduce emissions, and reduce operating costs; and the sewage treatment efficiency is high and the operation is stable.

[0057] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A wastewater treatment system for the production of ethylene oxide and ethylene glycol, characterized in that: The system comprises a low-salt wastewater treatment system (10), a high-salt wastewater treatment system (20) and a reclaimed water reuse system (30). The wastewater treated by the low-salt wastewater treatment system (10) and the high-salt wastewater treatment system (20) is then passed through the reclaimed water reuse system (30) to achieve wastewater treatment and recycling.

2. A wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 1, characterized in that: The low-salt wastewater treatment system (10) comprises a low-salt regulating tank (11), a biological selection tank (12), a low-salt ASR tank (13), a low-salt CBR tank (14) and a low-salt secondary sedimentation tank (15) which are connected in sequence. The effluent of the low-salt secondary sedimentation tank (15) is connected to a high-efficiency clarification tank (16), and the sludge at the bottom of the low-salt secondary sedimentation tank (15) is connected to a sludge return tank (17) to achieve low-salt wastewater treatment.

3. A wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 2, characterized in that: The effluent of the high-efficiency clarification tank (16) is connected to the reuse water tank (18), and the effluent of the reuse water tank (18) is connected to the reclaimed water reuse system (30); the sludge at the bottom of the high-efficiency clarification tank (16) is connected to other sludge tanks (4) through a pipeline, and the sludge return tank (17) is connected to the biological selection tank (12) or other sludge tanks (4) through a pump body, so as to reuse or discharge the sludge.

4. A wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 1, characterized in that: The high-salt wastewater treatment system (20) comprises a waste alkali liquid pool (21), a high-salt regulating pool (22), an anoxic pool (23), a high-salt CBR pool (24), a high-salt ASR pool (25) and a high-salt secondary sedimentation pool (26) which are connected in sequence, and the high-salt secondary sedimentation pool (26) is connected to a final sedimentation pool (27) to achieve high-salt wastewater treatment.

5. A wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 4, characterized in that: The effluent from the final sedimentation tank (27) is connected to the ozone reaction tank (28), the high-salt post-CBR tank (29) and the discharge tank (291) in sequence; the effluent from the discharge tank (291) is connected to the outlet of the sewage treatment plant so as to be discharged after the effluent is tested to be qualified; the sludge at the bottom of the final sedimentation tank (27) is connected to other sludge tanks (4) through pipelines so as to reuse the effluent or discharge the sludge through the other sludge tanks (4).

6. A wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 7, characterized in that: The ozone reaction tank (28) comprises at least three tank bodies, and first circulating water equipment (281) is provided between adjacent tank bodies and between a tank body close to the final sedimentation tank (27) and the final sedimentation tank (27) to achieve sewage circulation treatment between the tank bodies.

7. A wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 1, characterized in that: The reclaimed water reuse system (30) comprises a reclaimed water regulating tank (31), a hardness removal sedimentation tank (32), an ozone inlet tank (33), an ozone contact tank (34) and a reclaimed water post-CBR tank (35) which are connected in sequence. The reclaimed water post-CBR tank (35) is connected to an RO membrane treatment tank (36). The fresh water produced by the RO membrane treatment tank (36) is reused in a low-salinity wastewater treatment system (10). The concentrated water produced by the RO membrane treatment tank (36) is connected to an RO concentrated water hardness removal tank (37). The effluent of the RO concentrated water hardness removal tank (37) is reused in a high-salinity wastewater treatment system (20). The bottom sludge is connected to a hardness removal sludge tank (5). The RO membrane treatment tank (36) includes a reclaimed water inlet tank (361), an ultrafiltration water production tank (362) and an RO water production tank (363) which are connected in sequence. The effluent from the reclaimed water inlet tank (361) is sequentially filtered through sand, ultrafiltration and RO membrane to produce concentrated water which is connected to the RO concentrated water de-hardening tank (37). The fresh water produced by the ultrafiltration enters the ultrafiltration water production tank (362), and the fresh water produced by the RO membrane enters the RO water production tank (363), and the fresh water is reused.

8. A wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 7, characterized in that: The ozone contact tank (34) comprises at least three tank bodies, and a second circulating water device (341) is provided between adjacent tank bodies and between a tank body close to the ozone water inlet tank (33) and the ozone water inlet tank (33) to achieve wastewater circulation treatment between the tank bodies.

9. A wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 7, characterized in that: The effluent from the hard sludge removal tank (5) is connected to other sludge tanks (4) so ​​that the effluent can be reused or the sludge can be discharged through other sludge tanks (4); the sludge at the bottom of the hard sludge removal tank (5) is connected to a plate and frame filter press (6) through a pump body so that the sludge can be dehydrated and then discharged; the filtered water from the plate and frame filter press (6) is connected to a filtrate tank (7), and the effluent from the filtrate tank (7) is reused in a reclaimed water reuse system (30).

10. A wastewater treatment system for ethylene oxide and ethylene glycol production according to claim 3, 5 or 9, characterized in that: The outlet water of the other sludge pool (4) is connected to the water collection pool (8), and the outlet water of the water collection pool (8) is reused in the reclaimed water reuse system (30). The sludge at the bottom is connected to the screw stacking machine (9) through a pump body to dehydrate the sludge and then discharge it externally; the filtered water of the screw stacking machine (9) is connected to the filtrate pool (7), and the outlet water of the filtrate pool (7) is reused in the reclaimed water reuse system (30).

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