CN108033636A - A kind of product oil storage field sewage disposal system and its sewage water treatment method - Google Patents
A kind of product oil storage field sewage disposal system and its sewage water treatment method Download PDFInfo
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- CN108033636A CN108033636A CN201711344527.6A CN201711344527A CN108033636A CN 108033636 A CN108033636 A CN 108033636A CN 201711344527 A CN201711344527 A CN 201711344527A CN 108033636 A CN108033636 A CN 108033636A
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- water
- catalytic ozonation
- integrated film
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- disposal system
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a kind of product oil storage field sewage disposal system and its sewage water treatment method, including the regulating reservoir and ceramic base function film device being connected, the water inlet connection oily wastewater of the regulating reservoir, the water outlet of the ceramic base function film device connects dense oil-water recovering device and integrated film bioreactor respectively, the integrated film bioreactor is provided with the air intake of connection air and the mud discharging mouth of connection sludge dehydration device, the water outlet connection catalytic ozonation tower of the integrated film bioreactor, the catalytic ozonation tower is provided with the ozone inlet of connection ozone, the water outlet of the catalytic ozonation tower connects the refluxing opening and clear water reserviors of the integrated film bioreactor respectively, the water outlet of the clear water reserviors connects the water return outlet and the outer comb line of clear water of the regulating reservoir respectively.It is of the invention effectively to remove petroleum-type and COD pollutants, treatment effect is improved, realizes the qualified discharge of oil gas storehouse sewage, while be beneficial to dense oily recycling.
Description
Technical field
The present invention relates to sewage disposal technology, more particularly to a kind of product oil storage field sewage disposal system and its sewage disposal side
Method.
Background technology
Product oil storage field oily wastewater mainly includes Oilcan cleaning water, flushing water, oil tank and cuts water and initial rainwater etc., has water
The distinguishing features such as amount change is big, discharge is discontinuous, the discharge cycle is irregular.Oil content is generally from tens to thousands of in oily wastewater
Milligrams per liters etc., complicated component, is mainly present in waste water in the form of dispersed oil, oil emulsion and dissolved oil etc..In oily waste water
Governance process in, be considered as first as far as possible recycle sewage in oil, secondly handle after water to meet environment protection emission will
Ask.
It is domestic these on oily wastewater processing mainly based on oil removing, to realize discharged wastewater met the national standard as target, and
The recycling to oil is not considered.Chinese patent 201410395377.1 discloses a kind of processing method of product oil storage field sewage,
By using pre-filtering separator, level-one coalescing separator, two level coalescing separator and Galvanosorptive reaction device, the stone of water outlet is realized
Oils≤1.0mg/L, COD≤50mg/L；Chinese patent 201110358455.7 discloses a kind of oil gas storehouse and gas station's waste water
Processing method, oily wastewater qualified discharge is promoted using " oil removal+coagulation air-float+photoelectrocatalysioxidization oxidization " group technology.
The content of the invention
The purpose of the present invention is overcome deficiency of the prior art, there is provided a kind of product oil storage field sewage disposal system and its dirt
Method for treating water, by ceramic base function membrane filtration, integrated film bioreactor and catalytic ozonation group technology, is realized
The recycling of the qualified discharge of oil depot oily wastewater and oil.
The technical solution adopted in the present invention is：A kind of product oil storage field sewage disposal system, including the regulating reservoir being connected
With ceramic base function film device, the water inlet connection oily wastewater of the regulating reservoir, the water outlet of the ceramic base function film device
Mouth connects dense oil-water recovering device and integrated film bioreactor respectively, and the integrated film bioreactor is provided with connection
The air intake of air and the mud discharging mouth of connection sludge dehydration device, the water outlet connection of the integrated film bioreactor are smelly
Oxygen catalysis oxidizing tower, the catalytic ozonation tower are provided with the ozone inlet of connection ozone, the catalytic ozonation tower
Water outlet connects the refluxing opening and clear water reserviors of the integrated film bioreactor respectively, and the water outlet of the clear water reserviors connects respectively
Connect the water return outlet and the outer comb line of clear water of the regulating reservoir.
Functional membrane intake pump is provided with the connecting pipeline of the regulating reservoir and the ceramic base function film device.
Ozone catalytic is provided with the connecting pipeline of the integrated film bioreactor and the catalytic ozonation tower
Aoxidize intake pump.
The clear water reserviors connect and are provided with clarified water pump in the connecting pipeline of the outer comb line of the regulating reservoir and clear water.
The cocnentration factor of the ceramic base function film device is 3~10, and producing water ratio is 66.7~90.0%.
The integrated film bioreactor is made of hydrolysis acidification section, aerobic section and membrane biological reaction section；The hydrolysis
The waterpower dwell time of sewage of acidification reactor is respectively 12~18h, the waterpower dwell time of sewage point of the aerobic reactor
Not Wei 8~12h, the waterpower dwell time of sewage of the membrane bioreactor is respectively 4~6h.
The hydraulic detention time of the catalytic ozonation tower is 2~3h, and ozone dosage is 50~150mg/L.
The water for being back to integrated film bioreactor through the catalytic ozonation tower accounts for catalytic ozonation tower production water
30~100%.
Based on the sewage water treatment method of above-mentioned product oil storage field sewage disposal system, comprise the following steps：
(1) product oil storage field sewage enters ceramic base function membrane separation device by regulating reservoir, carries out water-oil separating, film production water
From integrated film bioreactor is flow to, biological oxidation is carried out, dense grease flow to dense oil-water recovering device；
(2) integrated film bioreactor is promoted to catalytic ozonation tower through catalytic ozonation intake pump；
(3) catalytic ozonation tower production water section is back to integrated film bioreactor, partly flow to clear water reserviors；
(4) discharged through the water up to standard of clear water reserviors after clarified water pump is lifted, unqualified water is back to tune after clarified water pump is lifted
Section pond is again introduced into sewage disposal system, repeat step (1) to step (4).
The beneficial effects of the invention are as follows：
1. can comprehensively, efficiently remove petroleum-type, especially can remove oil emulsion and the dissolubility that traditional handicraft is difficult to remove
Oil；
2. the oil of ceramic base functional membrane concentrated water side is handled since concentration is beneficial to subsequent recovery；
3. the combination of integrated film bioreactor and catalytic ozonation can effectively remove biodegradability and difficult degradation
Pollutant；
4., can by the combination of ceramic base function membrane filtration, integrated film bioreactor and catalytic ozonation technique
Substantially reduce processing cost.
Brief description of the drawings
Fig. 1：A kind of product oil storage field sewage disposal system structure diagram of the present invention.
Attached drawing marks：1- regulating reservoirs；2- functional membrane intake pumps；3- ceramic base function film devices；4- integration membrane bioreactions
Answer device；5- catalytic ozonation intake pumps；6- catalytic ozonation towers；7- clear water reserviors；8- clarified water pumps.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
The present invention uses ceramic base function membrane filtration+integrated film bioreactor 4+ catalytic ozonation group technologies,
Realize the qualified discharge of oil gas storehouse sewage, i.e. COD≤60mg/L, petroleum-type≤3mg/L.
As shown in Figure 1, a kind of product oil storage field sewage disposal system, including the regulating reservoir 1 and ceramic base function being connected
Film device 3, the water inlet connection oily wastewater of the regulating reservoir 1, the regulating reservoir 1 and the ceramic base function film device 3
Functional membrane intake pump 2 is provided with connecting pipeline；The water outlet of the ceramic base function film device 3 connects dense grease recycling respectively
Device and integrated film bioreactor 4, the integrated film bioreactor 4 are provided with air intake and the company of connection air
Meet the mud discharging mouth of sludge dehydration device, the water outlet connection catalytic ozonation tower 6 of the integrated film bioreactor 4, institute
State and catalytic ozonation water inlet is provided with the connecting pipeline of integrated film bioreactor 4 and the catalytic ozonation tower 6
Pump 5；The catalytic ozonation tower 6 is provided with the ozone inlet of connection ozone, the water outlet point of the catalytic ozonation tower 6
The refluxing opening and clear water reserviors 7 of the integrated film bioreactor 4 are not connected, and the water outlet of the clear water reserviors 7 connects institute respectively
The water return outlet and the outer comb line of clear water, the clear water reserviors 7 for stating regulating reservoir 1 connect the company of the outer comb line of the regulating reservoir 1 and clear water
Clarified water pump 8 is provided with adapter line.
Wherein, the cocnentration factor of the ceramic base function film device 3 is 3~10, and producing water ratio is 66.7~90.0%.Described one
Body membrane bioreactor 4 is made of hydrolysis acidification section, aerobic section and membrane biological reaction section；The water of the reactor for hydrolysis and acidification
Power dwell time of sewage is respectively 12~18h, and the waterpower dwell time of sewage of the aerobic reactor is respectively 8~12h, described
The waterpower dwell time of sewage of membrane bioreactor is respectively 4~6h.The hydraulic detention time of the catalytic ozonation tower 6 is
2~3h, ozone dosage are 50~150mg/L.Integrated film bioreactor 4 is back to through the catalytic ozonation tower 6
Water account for catalytic ozonation tower 6 produce water 30~100%, i.e., reflux ratio control 30~100%.
Based on the sewage water treatment method of above-mentioned product oil storage field sewage disposal system, comprise the following steps：
(1) product oil storage field sewage enters ceramic base function membrane separation device by regulating reservoir 1, carries out water-oil separating, film production
Water carries out biological oxidation from integrated film bioreactor 4 is flow to, and dense grease flow to dense oil-water recovering device；
(2) integrated film bioreactor 4 is promoted to catalytic ozonation tower 6 through catalytic ozonation intake pump 5；
(3) catalytic ozonation tower 6 produces water section and is back to integrated film bioreactor 4, partly flow to clear water reserviors 7；
(4) discharged through the water up to standard of clear water reserviors 7 after the lifting of clarified water pump 8, unqualified water is back to after the lifting of clarified water pump 8
Regulating reservoir 1 is again introduced into sewage disposal system, repeat step (1) to step (4).
Verify product oil storage field sewage disposal system of the present invention and its sewage water treatment method to dirt with reference to specific embodiment
The treatment effect of water.
Embodiment 1
Water is cut using the technology of the present invention to offshore oil Yangjiang Industrial Co., Ltd. diesel fuel tank to handle, treatment scale is
4.5m3/h.Oily wastewater is promoted to ceramic base functional membrane dress after progress homogeneous adjusting in regulating reservoir 1 through functional membrane intake pump 2
3 are put, oil-containing concentrated water flow control is in 1.5m3/ h, production water flow are 3m3/ h, cocnentration factor 3, producing water ratio reaches 66.7%；Produce water
Together enter integrated film bioreactor 4 with the recirculation water from catalytic ozonation tower 6, hydrolysis acidification section, aerobic section and
The hydraulic detention time of membrane biological reaction section is respectively 18h, 12h and 6h；Membrane biological reaction section discharges water to catalytic ozonation tower
6, hydraulic detention time 3h, ozone dosage 150mg/L, 3m in 6 water outlet of catalytic ozonation tower3/ h is back to integration
Membrane bioreactor 4, reflux ratio 100%, 3m3/ h enters clear water reserviors 7 as production water, is lifted after water quality qualification through clarified water pump 8
Discharge, it is unqualified to be back to regulating reservoir 1 through the lifting of clarified water pump 8 and be again introduced into processing system.
Diesel fuel tank cuts water raw water COD average out to 960mg/L, petroleum hydrocarbons average out to 67mg/L, treated by the present method
Afterwards, water COD average out to 53mg/L, petroleum hydrocarbons concentration average out to 1.1mg/L are produced, having reached company's sewage drainage standard will
Ask.
Embodiment 2
Water is cut using the technology of the present invention to offshore oil Yangjiang Industrial Co., Ltd. gasoline cistern to handle, treatment scale is
5m3/h.Gasoline cistern cuts water and is promoted to ceramic base function film device 3, oil-containing through functional membrane intake pump 2 after mixing in regulating reservoir 1
Concentrated water flow control is in 0.5m3/ h, production water flow are 4.5m3/ h, cocnentration factor 10, producing water ratio reaches 90%；It is smelly with coming to produce water
The recirculation water of oxygen catalysis oxidizing tower 6 together enters integrated film bioreactor 4, in hydrolysis acidification section, aerobic section and film biology
The hydraulic detention time of conversion zone is respectively 12h, 8h and 4h；Membrane biological reaction section discharges water to catalytic ozonation tower 6, and waterpower is stopped
It is 2h, ozone dosage 60mg/L, 1.35m in 6 water outlet of catalytic ozonation tower to stay the time3/ h is back to integrated film biology
Reactor 4, reflux ratio 30%, remaining production water enter clear water reserviors 7, are lifted and discharged through clarified water pump 8 after water quality qualification, unqualified warp
Clarified water pump 8 is back to regulating reservoir 1 and is again introduced into processing system.
Gasoline cistern cuts water raw water COD average out to 1250mg/L, petroleum hydrocarbons average out to 48mg/L, treated by the present method
Afterwards, water COD average out to 44mg/L, petroleum hydrocarbons concentration average out to 2.1mg/L are produced, having reached company's sewage drainage standard will
Ask.
Embodiment 3
Water is cut to offshore oil Yangjiang Industrial Co., Ltd. gasoline cistern using the technology of the present invention and diesel fuel tank cuts the mixing of water
Sewage is handled, and two kinds of sewage press 1:1 mixing, sewage total amount is 4.2m3/h.Two kinds of sewage mixing in regulating reservoir 1, through work(
Energy film intake pump 2 is promoted to ceramic base function film device 3, and oil-containing concentrated water flow control is in 0.6m3/ h, production water flow are 3.6m3/
H, cocnentration factor 7, producing water ratio reaches 85.7%；Water is produced with the recirculation water from catalytic ozonation tower 6 together into integrated
Membrane bioreactor 4, the hydraulic detention time of hydrolysis acidification section, aerobic section and membrane biological reaction section be respectively 15h, 9.6h and
4.8h；Membrane biological reaction section discharges water to catalytic ozonation tower 6, hydraulic detention time 2.5h, ozone dosage 120mg/
L, 2.88m in 6 water outlet of catalytic ozonation tower3/ h is back to integrated film bioreactor 4, reflux ratio 80%, remaining production
Water enters clear water reserviors 7, is lifted and discharged through clarified water pump 8 after water quality qualification, it is unqualified through clarified water pump 8 be back to regulating reservoir 1 again into
Enter processing system.
Combined sewage COD average out to 1127mg/L, petroleum hydrocarbons average out to 56mg/L, after treated by the present method, production
Water COD average out to 50mg/L, petroleum hydrocarbons concentration average out to 1.8mg/L, have reached company's sewage drainage standard requirement.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited in upper
The embodiment stated, above-mentioned embodiment is only schematical, be not it is restricted, this area it is common
Technical staff in the case of present inventive concept and scope of the claimed protection is not departed from, may be used also under the enlightenment of the present invention
By make it is many in the form of, these are belonged within protection scope of the present invention.
Claims (9)
1. a kind of product oil storage field sewage disposal system, it is characterised in that filled including the regulating reservoir being connected and ceramic base functional membrane
Put, the water inlet connection oily wastewater of the regulating reservoir, the water outlet of the ceramic base function film device connects dense grease respectively
Retracting device and integrated film bioreactor, the integrated film bioreactor be provided with connection air air intake and
Connect the mud discharging mouth of sludge dehydration device, the water outlet connection catalytic ozonation tower of the integrated film bioreactor, institute
The ozone inlet that catalytic ozonation tower is provided with connection ozone is stated, the water outlet of the catalytic ozonation tower connects institute respectively
The refluxing opening and clear water reserviors of integrated film bioreactor are stated, the water outlet of the clear water reserviors connects returning for the regulating reservoir respectively
The mouth of a river and the outer comb line of clear water.
A kind of 2. product oil storage field sewage disposal system according to claim 1, it is characterised in that the regulating reservoir and described
Functional membrane intake pump is provided with the connecting pipeline of ceramic base function film device.
A kind of 3. product oil storage field sewage disposal system according to claim 1, it is characterised in that the integrated film biology
Catalytic ozonation intake pump is provided with the connecting pipeline of reactor and the catalytic ozonation tower.
4. a kind of product oil storage field sewage disposal system according to claim 1, it is characterised in that the clear water reserviors connect institute
State and be provided with clarified water pump in the connecting pipeline of regulating reservoir and the outer comb line of clear water.
A kind of 5. product oil storage field sewage disposal system according to claim 1, it is characterised in that the ceramic base functional membrane
The cocnentration factor of device is 3~10, and producing water ratio is 66.7~90.0%.
A kind of 6. product oil storage field sewage disposal system according to claim 1, it is characterised in that the integrated film biology
Reactor is made of hydrolysis acidification section, aerobic section and membrane biological reaction section；The waterpower sewage of the reactor for hydrolysis and acidification stops
Time is respectively 12~18h, and the waterpower dwell time of sewage of the aerobic reactor is respectively 8~12h, the membrane biological reaction
The waterpower dwell time of sewage of device is respectively 4~6h.
A kind of 7. product oil storage field sewage disposal system according to claim 1, it is characterised in that the catalytic ozonation
The hydraulic detention time of tower is 2~3h, and ozone dosage is 50~150mg/L.
8. a kind of product oil storage field sewage disposal system according to claim 1, it is characterised in that through the ozone catalytic oxygen
The water that change tower is back to integrated film bioreactor accounts for the 30~100% of catalytic ozonation tower production water.
9. a kind of sewage water treatment method based on any one of the claims 1 to the 8 product oil storage field sewage disposal system, its
It is characterized in that, comprises the following steps：
(1) product oil storage field sewage enters ceramic base function membrane separation device by regulating reservoir, carries out water-oil separating, film production water gravity flow
To integrated film bioreactor, biological oxidation is carried out, dense grease flow to dense oil-water recovering device；
(2) integrated film bioreactor is promoted to catalytic ozonation tower through catalytic ozonation intake pump；
(3) catalytic ozonation tower production water section is back to integrated film bioreactor, partly flow to clear water reserviors；
(4) discharged through the water up to standard of clear water reserviors after clarified water pump is lifted, unqualified water is back to regulating reservoir after clarified water pump is lifted
It is again introduced into sewage disposal system, repeat step (1) to step (4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711344527.6A CN108033636A (en) | 2017-12-15 | 2017-12-15 | A kind of product oil storage field sewage disposal system and its sewage water treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711344527.6A CN108033636A (en) | 2017-12-15 | 2017-12-15 | A kind of product oil storage field sewage disposal system and its sewage water treatment method |
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| CN108033636A true CN108033636A (en) | 2018-05-15 |
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ID=62103022
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150085990A (en) * | 2014-01-17 | 2015-07-27 | 코웨이 주식회사 | Water and wastewater treatment system and metho of the same |
| CN105036507A (en) * | 2015-08-07 | 2015-11-11 | 中国海洋石油总公司 | Pyrolysis oil-gas-water synchronous condensing and oil-water separation recovery system and method |
| CN105731706A (en) * | 2016-02-18 | 2016-07-06 | 北京清大国华环境股份有限公司 | Treatment method and device for extremely-high-concentration waste emulsion |
| CN206127063U (en) * | 2016-08-31 | 2017-04-26 | 北京华福环境工程科技有限公司 | Petrochemical sewage degree of depth processing system |
| CN206437928U (en) * | 2017-01-05 | 2017-08-25 | 中山市恒雅环保工程有限公司 | Integrated A O MBR biochemical treatment apparatus |
-
2017
- 2017-12-15 CN CN201711344527.6A patent/CN108033636A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150085990A (en) * | 2014-01-17 | 2015-07-27 | 코웨이 주식회사 | Water and wastewater treatment system and metho of the same |
| CN105036507A (en) * | 2015-08-07 | 2015-11-11 | 中国海洋石油总公司 | Pyrolysis oil-gas-water synchronous condensing and oil-water separation recovery system and method |
| CN105731706A (en) * | 2016-02-18 | 2016-07-06 | 北京清大国华环境股份有限公司 | Treatment method and device for extremely-high-concentration waste emulsion |
| CN206127063U (en) * | 2016-08-31 | 2017-04-26 | 北京华福环境工程科技有限公司 | Petrochemical sewage degree of depth processing system |
| CN206437928U (en) * | 2017-01-05 | 2017-08-25 | 中山市恒雅环保工程有限公司 | Integrated A O MBR biochemical treatment apparatus |
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