CN101880086A - Complex biological filter for synchronously treating sewage and off odor - Google Patents

Complex biological filter for synchronously treating sewage and off odor Download PDF

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Publication number
CN101880086A
CN101880086A CN2010100022873A CN201010002287A CN101880086A CN 101880086 A CN101880086 A CN 101880086A CN 2010100022873 A CN2010100022873 A CN 2010100022873A CN 201010002287 A CN201010002287 A CN 201010002287A CN 101880086 A CN101880086 A CN 101880086A
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sewage
biological filter
filler
complex biological
water
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董启荣
匡颖
王鹤立
王振兴
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

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Abstract

For a long time, sewage plants are troubled by the problems of large energy consumption, high operating cost, foul odor generation and the like. Therefore, the invention provides a complex biological filter which can make use of a microbial metabolism to synchronously treating sewage and off odor, and comprises the following characteristics of: greatly saving aeration energy consumption and reducing the operating cost by supplying oxygen in a trickling filtration mode; forming an aerobic section and an anoxic section in the same biological filter by optimizing the structure of the biological filter, and supplementing a carbon source through water inflow distribution to ensure that the removal efficiency of total nitrogen is improved; improving the removal efficiency of total phosphorus in the sewage through enhanced phosphorus removal of a filling material; and saving a secondary sedimentation tank because the upper part of the complex biological filter generates a small amount of excess sludge and the anoxic section on the lower part can further perform filtration and interception.

Description

The complex biological filter of a kind of synchronously treating sewage and foul smell
Technical field:
Patent of the present invention belongs to the environmental protection equipment technical field, relates to a kind of improvement of sewage treatment process equipment.
Background technology:
Sewage disposal is the complex art of energy intensive.For a long time, problem such as big, working cost height of energy consumption has seriously hindered the construction and the operation of China's municipal wastewater treatment plant.China's municipal sewage plant's energy consumption is mainly used in the unit of biological sewage treatment and sludge treatment, account for more than 60% of Sewage Plant direct operating cost, wherein the biological sewage treatment energy consumption mainly concentrates on the air blast machine room of the oxygen supply of second-stage treatment, accounts for full factory energy consumption more than 70%.Therefore the biologic treating technique research that aeration energy consumption is little, sludge yield is low is very urgent and necessary
Also there is " waste gas " problem in sewage work in addition, i.e. sewage treatment structure, and particularly the sludge treatment unit distributes the problem of foul odour, also has sludge incineration to handle the De dioxin air pollution problems inherent that produces.A lot of municipal sewage plants and residential district are adjoined, ignored air-polluting has been controlled owing to being confined to purification of water quality in the design of these treatment plants, cause the severe exacerbation of people around's habitat environment, should take measures to alleviate the pollution of Sewage Plant stench and toxic gas as early as possible, and its corresponding technical measures is also in research is explored to environment.
Simultaneously, " urban wastewater treatment firm pollutant emission standard " GB18918-2002 has had more strict regulation to the discharging of nitrogen, phosphorus, particularly on the basis of ammonia nitrogen index, having increased the control of total nitrogen index, and the while denitrogenation dephosphorizing effect of China's municipal effluent biological treatment at present is scarcely stable, coverage ratio is lower, still remains further perfect.
Summary of the invention:
In order to address the above problem, patent of the present invention provides the complex biological filter technology of a kind of aerobic-anoxic integral type synchronous processing sanitary sewage and foul gas.Promptly enter biological filter two portions up and down respectively with certain allocation proportion through just heavy sewage, the top water stream mode is for dripping the filter formula, form aerobic section, be filled with media such as macrobead or structured packing and reinforced phosphor-removing filler, and introduce foul smell at this section and carry out synchronous processing, utilize microbial metabolism mechanism, remove the degradable pollutent in sewage and the foul smell, and ammonia nitrogen in the sewage is oxidized to nitrate, the filler of dephosphorization simultaneously can remove by the sedimentation that phosphorus is carried out in absorption-reaction; The bottom is a submerged condition, forms the anoxic section, and filler is the small-particle medium, utilizes just heavy back to distribute organic carbon source in the water inlet, and the nitrate that epimere is flowed in the mixed solution further carries out denitrification denitrogenation; Water outlet can be back to the top water inlet pipe by a certain percentage by reflux, to improve sewage treating efficiency.Be described in detail as follows:
Complex biological filter top according to amount of inlet water, water concentration and processing requirements, can be divided into several layers for dripping the filter aerobic section, every layer of independent support, and there is certain space at every layer of top apart from last layer.Each layer can be loaded different fillers separately, also filler can be loaded by required mixed.The top filler can be less macrobead filler of vapour lock or in the structured packing one or more, the certain proportion of blending simultaneously has the filler of phosphorus removal functional, as in the fillers such as sponge iron particle, Wingdale one or more, can utilize microbial metabolism mechanism, remove the organic pollutant in the sewage, and ammonia nitrogen in the sewage is oxidized to nitrate, the filler of dephosphorization simultaneously can remove by the sedimentation that phosphorus is carried out in absorption-reaction; After foul smell enters top, filter tank aerobic section by blower unit, NH 3, H 2Odorant pollutants such as S, VOCs, thiomethyl alcohol are dissolved in sewage, and then by in the sewage and remove by metabolism attached to the microorganism on the filler, reach synchronous de-odorised function.
The complex biological filter bottom is for flooding the anoxic section, and various fillers or mixed packing are loaded in layering separately as required.The bottom filler is various denitrification flora apposition growth and the less fillers of particle diameter of being beneficial to, and can be in the biologic packing materials such as volcanics, biological ceramic particle one or more.For guaranteeing that microorganism has enough carbon sources to carry out anti-nitration reaction, a certain proportion of just heavy back sewage is introduced this section, carbon source is carried out denitrification denitrogenation with the nitrate in the epimere influent as a supplement; For guaranteeing effluent quality, return line is set simultaneously, the water outlet of anoxic section is flooded in the bottom be back to top water inlet pipe circular treatment by a certain percentage.
Characteristics of the present invention:
1, in this complex biological filter, sewage and foul smell can obtain handling synchronously;
2, adopt the mode oxygen supply of dripping filter, save aeration energy consumption significantly, reduce running cost;
3, excess sludge (microbial film comes off) amount of complex biological filter top generation is less, and bottom anoxic section can further be filtered and be held back, and can save second pond;
4, realize aerobic-anoxic in same filter tank, and consider that the just heavy sewage of part is dispensed to the anoxic section, therefore when guaranteeing COD, ammonia nitrogen processing efficiency, the removal efficient of total nitrogen is improved;
5, adopt filler-reinforced dephosphorization filler, improved removal efficient total phosphorus in the sewage.
To sum up, the present invention can realize functions such as saprobia degraded, denitrogenation dephosphorizing, processing foul gas at low cost in same biological filter, meet national energy-saving and emission-reduction general plan, has broad application prospects.
Description of drawings:
Fig. 1 is an aerobic-anoxic integral type complex biological filter system schematic
Among the figure: 1. sewage inlet pipe, 2. water distributor, 3. packing area, top, 4. supporting plate, 5. cloth air chamber, 6. back flushing drainage tray, 7. packing area, bottom, 8. collecting chamber, 9. back flushing water inlet pipe, 10. back flushing rising pipe, 11. bottoms water inlet arm, 12. return lines, 13. inlet pipe, 14. rising pipes.
Fig. 2 is a syllogic aerobic-anoxic integral type complex biological filter system schematic
Among the figure: 1. sewage inlet pipe, 2. filter tank, 3. water distributor, 4. top layer filler, 5. perforation supporting plate, 6. middle layer filler, 7. cloth air chamber, 8. back flushing drainage tray, 9. underfilling, 10. catchment filter, 12. bottom collecting chambers, 13. back flushing water inlet pipes, 14. back flushing rising pipes, 15. water inlet arms, 16. return lines, 17. inlet pipe, 18. rising pipes of filter plate, 11..
Embodiment:
2 introduce the concrete operational process of total system and implement parameter in conjunction with the accompanying drawings:
Sewage part after just sinking enters trickling filter from the top through sewage inlet pipe (1) under action of gravity, drench on the filler (4) of top layer through even the dripping of water distributor (3), through the biomembranous filtration of filling surface, organism is to a certain degree degraded, flow through again the perforation supporting plate (5), undertaken dripping the top of drenching intermediate filler layer (6) after twice aeration is strengthened reoxygenation by the space between packing layer, flow through the microbial film of filling surface, organism is further degraded, and ammonia nitrogen is oxidized to nitrate.This layer also mixed the filler of phosphorus removal functional, can play the effect of absorption one chemical precipitation to phosphorus.Top water outlet process perforation supporting plate is through cloth air chamber (7), drop onto back flushing drainage tray (8), converge the back and flow into the bottom section of flooding, wherein fill small-particle filler (9), the control hydraulics, can form the anaerobic environment that is beneficial to the denitrifying bacterium growth, will further be converted into nitrogen, reach the effect of complete denitrogenation at the nitrate that aerobic nitrification reaction in top, filter tank produces.The biological filter lower bottom end is provided with filter plate (10), and the filter (11) that catchments is installed, and the collecting chamber (12) bottom current flow into by filter is discharged by rising pipe (18), and wherein the part water outlet can be back to the top by return line (16).
In addition, for guaranteeing the required carbon source of bottom anti-nitration reaction, a part can directly be introduced back flushing drainage tray (8) by water inlet arm (15) through just heavy sewage, enters bottom by overflow and floods the anoxic section.Because the microbial film that top two layers comes off all converges at bottom with current, stop up for avoiding producing, be provided with back-purge system, back flushing water inlet pipe (13) is positioned at bottom collecting chamber (12), backwashing water passes through filter, enter bottom, by the back flushing drainage tray (8) and back flushing rising pipe (14) outflow on top.
Top at complex biological filter can connect induced draft fan, and under the air inducing effect, foul gas enters cloth air chamber (7) through inlet pipe (17) and evenly enters packing layer, NH 3, H 2Odor pollutants such as S, VOCs, thiomethyl alcohol are dissolved in liquid phase earlier, absorb through microbial film absorption to enter in the microorganism cells, to obtain degraded again.
Embodiment
Adopt complex biological filter that Beijing university campus sanitary sewage is handled, handling the water yield every day is 0.5m 3, the sewage influent quality is as shown in table 1.
Table 1 campus life sewage quality
Figure G2010100022873D00041
Foul smell is produced by the steel cylinder distribution, and the gas speed control is made as 100m during test 3/ h, NH in the air inlet 3, H 2S and thiomethyl alcohol concentration are respectively 8.65mg/m 3, 27.8mg/m 3And 0.86mg/m 3
According to field condition, near the sewage plant of campus, to test, complex biological filter is designed to column, high 300cm, internal diameter 19cm, useful volume is about 70L, and this filter tank is divided three sections from top to bottom, and every section high is 80cm; The top is for two sections to drip to have filtered oxygen condition, and end section is the anoxic submerged condition.
This system brought into operation in June, 2008, and the final outflow water water quality of total system is basicly stable, weekly to water-in and water-out water quality monitoring (WQM) 3 times, COD in the water outlet Cr, BOD 5, NH 3The mean concns of-N, TN and TP is 43.7mg/L, 23.1mg/L, 15.6mg/L, 5.3mg/L, 1.8mg/L, average removal rate is respectively 80.4%, 85.6%, 78.9%, 80.6.%, 76.8.%, and its final outflow water water quality is near satisfying " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) one-level A standard; Middle NH gives vent to anger 3, H 2S and thiomethyl alcohol mean concns are respectively 1.3mg/m 3, 0.8mg/m 3, 0.36mg/m 3,, average removal rate is respectively 85.6%, 97.4% and 57.6%, reaches national grade one discharge standard.

Claims (6)

1. the complex biological filter of synchronously treating sewage and foul smell comprises: top water inlet pipe (1), water distributor (2), packing area, top (3), supporting plate (4), cloth air chamber (5), back flushing drainage tray (6), packing area, bottom (7), collecting chamber (8), back flushing water inlet pipe (9), back flushing rising pipe (10), bottom water inlet pipe (11), return line (12), inlet pipe (13) and rising pipe (14); It is characterized by: be divided into two portions up and down, sewage enters respectively with certain allocation proportion, the top water stream mode is for dripping the filter formula, form aerobic section, be filled with macrobead filler or structured packing, and the reinforced phosphor-removing filler, and introduce foul smell at this section and carry out synchronous processing, utilize microbial metabolism mechanism to absorb and remove; The bottom is a submerged condition, forms the anoxic section, fills the small-particle filler; Water outlet is back to the top water inlet pipe by a certain percentage by reflux, to improve sewage treating efficiency.Functions such as sewage aerobic biological degradation, denitrogenation dephosphorizing, processing foul gas have been realized in the same biological filter.
2. according to the complex biological filter of claim 1 described a kind of synchronously treating sewage and foul smell, it is characterized in that: the filter aerobic section is dripped on top, according to amount of inlet water, water concentration and processing requirements, can be divided into several layers, every layer of independent support, and there is certain space at every layer of top apart from last layer.Each layer can be loaded different fillers separately, also filler can be loaded by required mixed.
3. according to the complex biological filter of claim 1 described a kind of synchronously treating sewage and foul smell, it is characterized in that: the bottom is to flood the anoxic section, and various fillers or mixed packing are loaded in layering separately as required.
4. the complex biological filter of a kind of synchronously treating sewage according to claim 1 and foul smell, it is characterized in that: after foul smell enters top, filter tank aerobic section by blower unit, by dissolution of contaminated water, and then, reach synchronous de-odorised function by in the sewage and remove by metabolism attached to the microorganism on the filler.
5. be characterized as according to filler in the complex biological filter of claim 1 described a kind of synchronously treating sewage and foul smell: top is one or more of less macrobead of vapour lock or structured packing, blending simultaneously necessarily have the filler of phosphorus removal functional such as sponge iron particle, Wingdale etc. one or more; The bottom be various be beneficial to the less filler of denitrification flora apposition growth and particle diameter such as volcanics, biological ceramic particle etc. one or more.
6. be characterized as according to filler in the complex biological filter of claim 1 described a kind of synchronously treating sewage and foul smell: have enough carbon sources to carry out anti-nitration reaction for guaranteeing microorganism, a certain proportion of former water is introduced this section, carbon source as a supplement.For guaranteeing effluent quality, return line is set simultaneously, sewage is back to top water inlet pipe circular treatment by a certain percentage.
CN2010100022873A 2010-01-18 2010-01-18 Complex biological filter for synchronously treating sewage and off odor Pending CN101880086A (en)

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Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102070281A (en) * 2010-12-01 2011-05-25 南京林业大学 Double-layer composite biological denitrification device and method
CN102583711A (en) * 2012-02-22 2012-07-18 宜兴市金德环保设备有限公司 Aerobic reactor
CN102718320A (en) * 2012-07-05 2012-10-10 广州赛特环保工程有限公司 Decontamination and deodorization system for sewage and odor and use method thereof
CN103073109A (en) * 2013-01-09 2013-05-01 常州大学 Composite biotrickling filter for nitrogen and phosphorus removal
CN103480269A (en) * 2013-10-15 2014-01-01 广东浩元环保科技发展有限公司 Biological deodorization method and device
CN103496786A (en) * 2013-10-22 2014-01-08 南京大学 Low-energy-consumption denitrification biological filter and treatment method thereof
CN103936234A (en) * 2014-04-30 2014-07-23 李文譞 Domestic sewage treatment system utilizing solar energy and treatment method of same
CN104176824A (en) * 2014-09-05 2014-12-03 北京思坦环保科技有限公司 Ammonium nitrate wastewater biochemical treatment device and operation method thereof
CN104496027A (en) * 2014-12-24 2015-04-08 东南大学 Short-range nitrogen-phosphorus inorganic reactor for treating rural domestic sewage
CN104495879A (en) * 2015-01-12 2015-04-08 武汉大学 Integrated contact oxidation/nitrogen and phosphorus removal-filtering separation bioreactor
CN105236551A (en) * 2015-09-30 2016-01-13 山东大学 Soil fast-filter bed system for purifying bioreactor tail gas
CN105254010A (en) * 2015-11-03 2016-01-20 重庆乐善环保科技有限公司 Reverse aeration sewage treatment pool and treatment method adopting treatment pool
CN105948423A (en) * 2016-07-15 2016-09-21 广州粤江环保科技有限公司 Sewage treatment system
CN105948249A (en) * 2016-06-13 2016-09-21 天津市环境保护科学研究院 Efficient filtering pool device for denitrification and dephosphorization and filtering method thereof
CN106007227A (en) * 2016-07-15 2016-10-12 广州粤江环保科技有限公司 Sewage treatment method
CN106139883A (en) * 2016-07-19 2016-11-23 华南理工大学 A kind of method and device of saprobia deodorization
CN107021561A (en) * 2017-04-07 2017-08-08 上海野马环保设备工程有限公司 A kind of biological deodorizing filler for possessing physics, chemistry and bio-cooperation
CN107021558A (en) * 2017-03-24 2017-08-08 机科发展科技股份有限公司 A kind of method and apparatus using drop filter processing sewage and foul smell
CN108793405A (en) * 2018-04-12 2018-11-13 北京林业大学 Build sewage water denitrification dephosphorization apparatus method, denitrification dephosphorization apparatus and denitrification and dephosphorization method
CN109502917A (en) * 2018-12-25 2019-03-22 兰州交通大学 A kind of residents underground powerless integration compound bio sewage-treatment plant and technique
CN109569265A (en) * 2017-09-28 2019-04-05 中国石油化工股份有限公司 Exhaust gas and wastewater treatment equipment
CN110790382A (en) * 2019-12-05 2020-02-14 吉康宁 Modularized micro-power equipment for treating rural domestic sewage and method thereof
CN110835207A (en) * 2019-12-05 2020-02-25 吉康宁 Small-sized integrated domestic sewage treatment device and sewage treatment method
CN112939381A (en) * 2021-04-22 2021-06-11 深圳市环境科学研究院 Multi-efficiency combined biological filter
CN114044609A (en) * 2021-11-19 2022-02-15 江苏力鼎环保装备有限公司 AO device and AO technology for efficiently removing nitrogen and phosphorus
CN114671566A (en) * 2022-02-24 2022-06-28 江西挺进环保科技股份有限公司 Distributed small-sized rural domestic sewage treatment equipment and treatment process

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102070281A (en) * 2010-12-01 2011-05-25 南京林业大学 Double-layer composite biological denitrification device and method
CN102583711A (en) * 2012-02-22 2012-07-18 宜兴市金德环保设备有限公司 Aerobic reactor
CN102718320A (en) * 2012-07-05 2012-10-10 广州赛特环保工程有限公司 Decontamination and deodorization system for sewage and odor and use method thereof
CN102718320B (en) * 2012-07-05 2013-12-18 广州赛特环保工程有限公司 Decontamination and deodorization system for sewage and odor and use method thereof
CN103073109A (en) * 2013-01-09 2013-05-01 常州大学 Composite biotrickling filter for nitrogen and phosphorus removal
CN103480269A (en) * 2013-10-15 2014-01-01 广东浩元环保科技发展有限公司 Biological deodorization method and device
CN103480269B (en) * 2013-10-15 2016-04-13 广东浩元环保科技发展有限公司 A kind of biologic deodorization method and device
CN103496786B (en) * 2013-10-22 2015-06-17 南京大学 Low-energy-consumption denitrification biological filter and treatment method thereof
CN103496786A (en) * 2013-10-22 2014-01-08 南京大学 Low-energy-consumption denitrification biological filter and treatment method thereof
CN103936234A (en) * 2014-04-30 2014-07-23 李文譞 Domestic sewage treatment system utilizing solar energy and treatment method of same
CN103936234B (en) * 2014-04-30 2016-01-27 李文 A kind of domestic sewage processing system and treatment process thereof utilizing sun power
CN104176824B (en) * 2014-09-05 2016-06-29 北京坦思环保科技有限公司 A kind of ammonium nitrate wastewater biochemical treatment apparatus and operation method
CN104176824A (en) * 2014-09-05 2014-12-03 北京思坦环保科技有限公司 Ammonium nitrate wastewater biochemical treatment device and operation method thereof
CN104496027A (en) * 2014-12-24 2015-04-08 东南大学 Short-range nitrogen-phosphorus inorganic reactor for treating rural domestic sewage
CN104495879A (en) * 2015-01-12 2015-04-08 武汉大学 Integrated contact oxidation/nitrogen and phosphorus removal-filtering separation bioreactor
CN105236551A (en) * 2015-09-30 2016-01-13 山东大学 Soil fast-filter bed system for purifying bioreactor tail gas
CN105236551B (en) * 2015-09-30 2017-08-29 山东大学 A kind of fast filter bed decontamination of biological reactor tail gas system of soil
CN105254010A (en) * 2015-11-03 2016-01-20 重庆乐善环保科技有限公司 Reverse aeration sewage treatment pool and treatment method adopting treatment pool
CN105948249A (en) * 2016-06-13 2016-09-21 天津市环境保护科学研究院 Efficient filtering pool device for denitrification and dephosphorization and filtering method thereof
CN105948423A (en) * 2016-07-15 2016-09-21 广州粤江环保科技有限公司 Sewage treatment system
CN106007227A (en) * 2016-07-15 2016-10-12 广州粤江环保科技有限公司 Sewage treatment method
CN106139883A (en) * 2016-07-19 2016-11-23 华南理工大学 A kind of method and device of saprobia deodorization
CN107021558A (en) * 2017-03-24 2017-08-08 机科发展科技股份有限公司 A kind of method and apparatus using drop filter processing sewage and foul smell
CN107021561A (en) * 2017-04-07 2017-08-08 上海野马环保设备工程有限公司 A kind of biological deodorizing filler for possessing physics, chemistry and bio-cooperation
CN109569265A (en) * 2017-09-28 2019-04-05 中国石油化工股份有限公司 Exhaust gas and wastewater treatment equipment
CN109569265B (en) * 2017-09-28 2021-05-14 中国石油化工股份有限公司 Waste gas and waste water treatment device
CN108793405A (en) * 2018-04-12 2018-11-13 北京林业大学 Build sewage water denitrification dephosphorization apparatus method, denitrification dephosphorization apparatus and denitrification and dephosphorization method
CN109502917A (en) * 2018-12-25 2019-03-22 兰州交通大学 A kind of residents underground powerless integration compound bio sewage-treatment plant and technique
CN110790382A (en) * 2019-12-05 2020-02-14 吉康宁 Modularized micro-power equipment for treating rural domestic sewage and method thereof
CN110835207A (en) * 2019-12-05 2020-02-25 吉康宁 Small-sized integrated domestic sewage treatment device and sewage treatment method
CN112939381A (en) * 2021-04-22 2021-06-11 深圳市环境科学研究院 Multi-efficiency combined biological filter
CN114044609A (en) * 2021-11-19 2022-02-15 江苏力鼎环保装备有限公司 AO device and AO technology for efficiently removing nitrogen and phosphorus
CN114671566A (en) * 2022-02-24 2022-06-28 江西挺进环保科技股份有限公司 Distributed small-sized rural domestic sewage treatment equipment and treatment process

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