CN102897978A - Taihu Lake region village sewage treatment and Duantou creek water environment repair method - Google Patents

Taihu Lake region village sewage treatment and Duantou creek water environment repair method Download PDF

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Publication number
CN102897978A
CN102897978A CN2012103927759A CN201210392775A CN102897978A CN 102897978 A CN102897978 A CN 102897978A CN 2012103927759 A CN2012103927759 A CN 2012103927759A CN 201210392775 A CN201210392775 A CN 201210392775A CN 102897978 A CN102897978 A CN 102897978A
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sewage
pond
village
water
processed
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张文艺
郑泽鑫
占明飞
李仁霞
戴如娟
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Changzhou University
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Changzhou University
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Abstract

The invention belongs to the technical field of sewage treatment, in particular to a Taihu Lake region village sewage treatment and Duantou creek water environment repair method. The method comprises the following steps of: after sewage and rain are collected by a town rain header pipe, joining in a regulating reservoir after the sewage and the rain flow to a grid via an overflow flood discharge pipe; lifting to an A/O integration-type brick-built sewage treatment facility via a water pump; in the facility, enabling the sewage to be subjected to anaerobic tank and contact aerobic tank treatment, flowing into a sedimentation tank for solid and liquid separation; causing parts of supernate to flow back to the anaerobic tank for denitrification; lifting lower-layer sludge at a fixed time to a sludge tank; after carrying out aerobic digestion in the sludge tank, externally conveying precipitates or composting; after precipitate effluent is collected by a clear water tank, externally discharging to an aeration fishpond for biological strengthening treatment; and finally, overflowing and discharging via an overflow dam. With the method disclosed by the invention, village domestic sewage treatment, creek ecological environment recovery and aquatic product efficient culture are combined into a whole. The method has the advantages of simpleness in construction, small investment and obvious ecological environment benefit and is easy for popularizing, and no surrounding lands of a river are occupied.

Description

A kind of TAI HU AREA village sewage is processed and broken end creek water surrounding restorative procedure
Technical field
The invention belongs to technical field of sewage, be specifically related to surrounding area, Taihu Lake village sewage and process and the reparation of broken end creek water surrounding original position.
Background technology
Taihu Lake, southern Jiangsu dense waterway net region, the river is numerous, and the little river (or artificial little water channel) that people's custom will be relevant with common people's daily life with agriculture production is called " creek ".In recent years, along with enforcement and the new countryside construction scale of country " village village logical " traffic programme constantly enlarges, the rural area traffic has obtained tremendous development, the creek of carrying communications and transportation loses its original navigation function gradually in the village, the behave of " filling out creek builds the road " that correspondingly produces becomes the broken end creek so that most creek is landfilled or blocks by the waist.
Village, Taihu Lake basin surrounding area majority disperses according to the creek two sides and builds, the two sides villager many with the river in the creek as life, water of productive use, yet because living, comparatively disperses the village Area Inhabitants, the sewage that produces enters the rainwater-collecting pipe network nearby by storm sewer mostly, enter at last creek, so that creek becomes and receives dirty carrier, and the dirty and messy surrounding enviroment in rural area flow into the rainfall runoff of creek when causing rainfall and carry a large amount of fowl and animal excrements and rural production, the domestic refuse floating matter, thereby cause the creek water pollution, resident's life and physical and mental health near the impact.In addition, these sewage finally import Taihu Lake, have increased the weight of the pollution load of Taihu Lake water body.
Summary of the invention
The present invention seeks to for solve that village, surrounding area, Taihu Lake and creek problem of environmental pollution propose a kind of efficiently, the less energy-consumption treatment process.
Sewage water treatment method provided by the present invention does not need additionally to build villages and small towns sewage collecting pipe network, collect village sanitary sewage and early-stage rainwater by the existing Storm Sewer Network in villages and small towns, then utilize buried facility to process, rely on simultaneously the broken end creek to make up the aeration fish pond, rely on the biopurification chinampa, fish pond zoobenthos and service fish carry out deep purifying to tail water, the final outflow water index can not only be reached and far below " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level B standard, water quality can return to water environment quality standard (GB 3838-2002) IV-V class in the creek.
The method of the invention schematic flow sheet is as shown in Figure 1, and is as follows:
After village sanitary sewage and early-stage rainwater are collected by villages and small towns rainwater house steward, flow through be provided with overflow port overflow flood discharge pipe to grid, behind grid, import equalizing tank.Only when quantity of precipitation is larger, after unnecessary rainwater causes equalizing tank and reaches maximum water level, then directly discharge excessive rainwater by overflow port.To the brick sewage treatment facility of A/O integrated form, this facility is for integrating buried, the brick type unitized construction of anaerobism → aerobic → precipitation → digestion via water pump lifting for sewage in the equalizing tank.The sewage acidifying that at first in anaerobic pond, is hydrolyzed in the facility, water outlet is from flowing into the contact Aerobic Pond, by the undercurrent type aerator that arranges at the bottom of the pond sewage is carried out aeration, sewage inflow settling tank carries out solid-liquid separation after aerobic treatment, the part supernatant liquor is back to anaerobic pond and carries out denitrification, quantity of reflux is 1-2 times of raw waste water flow, lower floor's mud regularly is promoted to sludge sump, carry out little oxygen air agitation in the sludge sump, carry out landfill or be used for local farmland compost by the periodic cleaning outward transport of local environmental sanitation department after the aerobic sigestion, the precipitation water outlet is outer after clean water basin compile to be drained into the aeration fish pond and carries out biological reinforced processing, passes through at last the overfall dike overflow discharge.
The invention has the beneficial effects as follows:
The present invention adopts the brick sewage treatment facility of A/O integrated form, take full advantage of original rainwater-collecting pipe network in the village, by building overflow flood discharge pipe, collect sanitary sewage and early-stage rainwater, rely on simultaneously creek to make up chinampa, reconstruction fish pond, form creek water surrounding original position and repair system.Not only processed the village sanitary sewage, but also collect and processed the village early-stage rainwater, thereby subdued remittance Taihu Lake pollution load from the source, guaranteed that environment is put in the fish pond in a suitable place to breed in the creek, realized that village domestic sewage treatment, the reparation of creek ecotope, aquatic products efficiently cultivate three and be positioned at one, have build simple, expensive few, do not take the soil of periphery along the river, the advantages such as ecological environment benefit is remarkable meet Rural areas residents'living habit and local economy holding capacity, are easy to promote.
Description of drawings
Fig. 1 is the schema of Taihu Lake Surrounding Settlements sanitary sewage disposal and broken end creek water surrounding original position renovation technique;
Among the figure: 1-overflow flood discharge pipe; The 2-grid; The 3-equalizing tank; The 4-anaerobic pond; The 5-contact-oxidation pool; The 6-settling tank; The 7-sludge sump; The 8-clean water basin; 9-aeration fish pond; The 10-overflow weir.
Embodiment
Such as Fig. 1, the present invention adopts " brick, the buried sewage treatment facility of A/O integrated form+aeration fish pond " integrated technique as Taihu Lake Surrounding Settlements sanitary sewage disposal and creek water surrounding ecological restoring method, buried microkinetic A/O is brickwork construction, mainly comprise anaerobic pond 4, contact-oxidation pool 5, settling tank 6, sludge sump 7,8 five continuous different sewage treatment structures of clean water basin, be provided with in the aeration fish pond 9 and purify the chinampa.
After village sanitary sewage and early-stage rainwater are collected by villages and small towns rainwater house steward, the excessive rain of overflow flood discharge pipe 1(of flowing through, sewage is from the overflow port earial drainage) to grid, hold back suspended substance in the sewage through grid 2, the particle that floating matter and particle diameter are larger, then enter equalizing tank 3, in order to regulate sewage quality, the water yield and pH, then via the acidifying that is hydrolyzed of water pump lifting to anaerobic pond 4, water outlet is from flowing into contact-oxidation pool 5, by the undercurrent aerator of settling at the bottom of the pond sewage in the pond is carried out aeration, impel the microorganism in the pond that the organic pollutant in the sewage is further degraded, settlement separate through settling tank 6, the part supernatant liquor is back to anaerobic pond 4, quantity of reflux is 1-2 times of raw waste water flow, lower floor's sludge lifting is to sludge sump 7, outward transport or compost after digestion, after importing clean water basin 8, the precipitation water outlet is disposed to creek, via aeration fish pond 9 in the creek and purify the chinampa to the advanced treatment of tail water, with the organic pollutant in the further removal sewage, improve simultaneously the creek water surrounding, by overflow weir 10 overflow discharges, finally import Taihu Lake basin.
The major function of above continuous different processing units is described below:
(1) major function of grid is that impurity to sewage comprises that the larger particulate matter of suspended substance, floating matter and particle diameter tackles, and unaffected to guarantee subsequent technique equipment, its spacing is 40-50mm;
(2) in the equalizing tank unit to the water quality of sewage and the water yield is regulated and all with, cut down the hydraulic load of peak time, regulate simultaneously the pH of sewage, the particulate matter that particle diameter is less can occur settlement separate this period, thereby reach the effect that Preliminary sewage is processed, guarantee to carry out the stable of the front water quality of biochemical treatment and the water yield, its hydraulic detention time is 4.0-5.0h.Two sewage pumps (1 usefulness 1 is standby) are settled in body bottom, pond, and to subsequent processing device, the water pump periphery is settled wire netting in order to lifting sewage, guarantee that water pump runs well;
(3) the anaerobic pond unit is to utilize anerobe and facultative anaerobe by nitrated and denitrification, and to remove the organic pollutant of hard degradation in the sewage, its total hrt is 6.0-8.0h;
(4) establish semi soft packing in the catalytic oxidation pool unit, aeration carries out oxygenation to sewage at the bottom of the pond, and make body interior sewage in pond be in flow state, to guarantee that sewage fully contacts with filler in the sewage, avoid existing in the biological contact oxidation pond sewage to contact uneven defective with filler, can keep very high microorganism concn in the pond, the organic pollutant that will flow out from anoxic pond further decomposes by biological oxidation, and its total hrt is 4.0-6.0h;
(5) after the settling tank unit is arranged on contact-oxidation pool, mainly be the place as solid-liquid separation.Settling tank is provided with water pump, and with being back to anaerobic pond so that precipitate supernatant liquor, quantity of reflux is 1-2 times of raw waste water flow, and lower floor's mud regularly is promoted to sludge sump, and its total hrt is 1.0-1.5h;
(6) major function of sludge sump unit is, because the surplus sludge volume that system produces is less, in order to guarantee the stable of surplus sludge volume, prevent phosphate releasing, carry out little oxygen air agitation in the sludge sump, by the periodic cleaning outward transport of local environmental sanitation department or be used for local farmland compost, its total hrt is 5-6d after the aerobic sigestion;
(7) the clean water basin unit mainly is the tail water of collecting through biochemical treatment, and drains into the aeration fish pond outward;
(8) have the purification chinampa in the unit, aeration fish pond.Fish pond projected depth 1-1.5m, water body stops 3-5d in the fish pond, purify the chinampa total area and account for 20% of fish pond water surface area, single chinampa is half elliptic, the long 3.0-3.5m of design semi-major axis, the long 2.0-2.5m of design minor semi-axis, chinampa Plants selection be vertical flower, Arundo donax, calamus, Spiked Loosestrife etc. again, wetland buoyancy aid filler is selected haydite, and is contemporary for plant growing soil.Press 0.03kg/m 2Density throw in by lime, clay and contain the substrate modifier that the soil ulmin of microbial preparation forms, press simultaneously 0.02kg/m 2Density throw in spiral shell, Corbicula fluminea, press 0.5kg/m 2Density throw in huge oyster, to reach the broken end creek is carried out substrate improvement and the foster purpose of zoobenthos control; The breeding density of pressing respectively 300 tail/mus, 50 tail/mus, 100 tail/mus in the fish pond cultivates the service fish such as silver carp, variegated carp, crucian, and fingerling is thrown in specification and is the 100g/ tail; Aerator is set up in the bottom, fish pond, intermittent operation in per 8 hours, each aeration 30 minutes.Unit, aeration fish pond mainly utilizes these bioaugmentation measures that the tail water that enters is carried out advanced treatment, simultaneously so that the degraded that the organic pollutant in the creek bed mud obtains continuing under the effect of microorganism and zoobenthos and inorganicization, being rich in the obnoxious flavour that contains in the inorganic nutrient salt of nitrogen phosphoric and the bed mud is therefore discharged, and float by means of the flow turbulence that is produced by aeration, nutritive salt absorbs via creek periphery and chinampa implants, with this Promoting plant growth, obnoxious flavour overflows from the water surface, guaranteed that the fish pond puts environment in a suitable place to breed, the zoobenthos that increases has expanded the creek ecologic food chain, thereby reduce the dosage of fish meal, indirectly improve the ability of self purification of water body, finally reach sewage quality purification in the village, creek pollutes repairing and treating, the purpose of the efficient cultivation of aquatic products.
Below provide 5 embodiment to further specify the present invention.
Embodiment 1
Surrounding Settlements 48m along the lake 3The sanitary sewage of/d flows into above-mentioned processing unit successively.Wherein Grill space is 40mm; Equalizing tank useful volume 10.00m 3, total residence time 5.00h; Anaerobic pond useful volume 16.00m 3, total residence time 8.00h; Contact-oxidation pool useful volume 12.00m 3, total residence time 6.00h; Settling tank useful volume 3.00m 3, total residence time 1.50h; Sludge sump useful volume 2.16m 3, total residence time 5d; Aeration fish pond depth of water 1.0m, water surface area 240.00m 2, put silver carp 108 tails, variegated carp 18 tails, crucian 36 tails in the fish pond in a suitable place to breed; Purify chinampa semi-major axis 3.0m, minor semi-axis 2.0m, chinampa total area 48.00m 2The CODcr of sewage is down to 28.00mg/L from 183.00mg/L, total nitrogen is down to 17.70mg/L from 55.40mg/L, total phosphorus is down to 0.926mg/L from 1.59mg/L, ammonia nitrogen is down to 0.318mg/L from 42.80mg/L, its clearance reaches respectively 84.70%, 68.05%, 41.76% and 99.26%, the effluent index value all is lower than " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level B standard, and creek overflow water outlet reaches the water quality requirement of water environment quality standard (GB 3838-2002) IV-V class water body.
Embodiment 2
Surrounding Settlements 65m along the lake 3The sanitary sewage of/d flows into above-mentioned processing unit successively.Wherein Grill space is 40mm; Equalizing tank useful volume 12.95m 3, total residence time 4.78h; Anaerobic pond useful volume 20.18m 3, total residence time 7.45h; Contact-oxidation pool useful volume 15.52.00m 3, total residence time 5.73h; Settling tank useful volume 3.71m 3, total residence time 1.37h; Sludge sump useful volume 2.16m 3, total residence time 5d; Aeration fish pond depth of water 1.0m, water surface area 279.50m 2, put silver carp 126 tails, variegated carp 21 tails, crucian 42 tails in the fish pond in a suitable place to breed; Purify chinampa semi-major axis 3.2m, minor semi-axis 2.3m, chinampa total area 55.90m 2The CODcr of sewage is down to 26.30mg/L from 192.53mg/L, total nitrogen is down to 17.96mg/L from 52.63mg/L, total phosphorus is down to 0.75mg/L from 1.32mg/L, ammonia nitrogen is down to 0.628mg/L from 44.56mg/L, its clearance reaches respectively 86.34%, 65.87%, 43.15% and 98.59%, the effluent index value all is lower than " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level B standard, and creek overflow water outlet reaches the water quality requirement of water environment quality standard (GB 3838-2002) IV-V class water body.
Embodiment 3
Surrounding Settlements 82m along the lake 3The sanitary sewage of/d flows into above-mentioned processing unit successively.Wherein Grill space is 40mm; Equalizing tank useful volume 15.44m 3, total residence time 4.52h; Anaerobic pond useful volume 23.85m 3, total residence time 6.98h; Contact-oxidation pool useful volume 19.00m 3, total residence time 5.56h; Settling tank useful volume 4.37m 3, total residence time 1.28h; Sludge sump useful volume 2.16m 3, total residence time 5d; Aeration fish pond depth of water 1.2m, water surface area 273.33m 2, put silver carp 123 tails, variegated carp 20 tails, crucian 41 tails in the fish pond in a suitable place to breed; Purify chinampa semi-major axis 3.3m, minor semi-axis 2.3m, chinampa total area 54.67m 2The CODcr of sewage is down to 26.28mg/L from 179.24mg/L, total nitrogen is down to 17.50mg/L from 58.78mg/L, total phosphorus is down to 0.795mg/L from 1.45mg/L, ammonia nitrogen is down to 0.732mg/L from 39.13mg/L, its clearance reaches respectively 85.34%, 70.23%, 45.17% and 98.13%, the effluent index value all is lower than " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level B standard, and creek overflow water outlet reaches the water quality requirement of water environment quality standard (GB 3838-2002) IV-V class water body.
Embodiment 4
Surrounding Settlements 96m along the lake 3The sanitary sewage of/d flows into above-mentioned processing unit successively.Wherein Grill space is 40mm; Equalizing tank useful volume 16.92.00m 3, total residence time 4.23h; Anaerobic pond useful volume 25.92m 3, total residence time 6.48h; Contact-oxidation pool useful volume 21.20m 3, total residence time 5.30h; Settling tank useful volume 4.52m 3, total residence time 1.13h; Sludge sump useful volume 2.16m 3, total residence time 5d; Aeration fish pond depth of water 1.5m, water surface area 230.40m 2, put silver carp 104 tails, variegated carp 17 tails, crucian 35 tails in the fish pond in a suitable place to breed; Purify chinampa semi-major axis 3.0m, minor semi-axis 2.2m, chinampa total area 46.08m 2The CODcr of sewage is down to 25.71mg/L from 200.57mg/L, total nitrogen is down to 18.40mg/L from 50.95mg/L, total phosphorus is down to 0.930mg/L from 1.84mg/L, ammonia nitrogen is down to 0.822mg/L from 38.42mg/L, its clearance reaches respectively 87.18%, 63.88%, 49.45% and 97.86%, the effluent index value all is lower than " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level B standard, and creek overflow water outlet reaches the water quality requirement of water environment quality standard (GB 3838-2002) IV-V class water body.
Embodiment 5
Surrounding Settlements 115m along the lake 3The sanitary sewage of/d flows into above-mentioned processing unit successively.Wherein Grill space is 40mm; Equalizing tank useful volume 19.17m 3, total residence time 4.00h; Anaerobic pond useful volume 28.75m 3, total residence time 6.00h; Contact-oxidation pool useful volume 23.96m 3, total residence time 5.00h; Settling tank useful volume 4.79m 3, total residence time 1.00h; Sludge sump useful volume 2.16m 3, total residence time 5d; Aeration fish pond depth of water 1.5m, water surface area 245.33m 2, put silver carp 111 tails, variegated carp 18 tails, crucian 37 tails in the fish pond in a suitable place to breed; Purify chinampa semi-major axis 3.5m, minor semi-axis 2.5m, chinampa total area 49.07m 2The CODcr of sewage is down to 29.68mg/L from 168.24mg/L, total nitrogen is down to 17.45mg/L from 57.12mg/L, total phosphorus is down to 0.979mg/L from 2.03mg/L, ammonia nitrogen is down to 0.369mg/L from 40.96mg/L, its clearance reaches respectively 82.36%, 69.45%, 51.76% and 99.10%, the effluent index value all is lower than " urban wastewater treatment firm pollutant emission standard " (GB 18918-2002) one-level B standard, and creek overflow water outlet reaches the water quality requirement of water environment quality standard (GB 3838-2002) IV-V class water body.

Claims (8)

1. a village sewage is processed and broken end creek water surrounding in-situ remediation method, it is characterized in that, after village sanitary sewage and early-stage rainwater are collected by villages and small towns rainwater house steward, flow through be provided with overflow port overflow flood discharge pipe to grid, behind grid, import equalizing tank; In the equalizing tank sewage via water pump lifting to the brick sewage treatment facility of A/O integrated form, the sewage acidifying that at first in anaerobic pond, is hydrolyzed in this facility, water outlet is from flowing into the contact Aerobic Pond, by the undercurrent type aerator that arranges at the bottom of the pond sewage is carried out aeration, sewage inflow settling tank carries out solid-liquid separation after aerobic treatment, the part supernatant liquor is back to anaerobic pond and carries out denitrification, quantity of reflux is 1-2 times of raw waste water flow, lower floor's mud regularly is promoted to sludge sump, carry out little oxygen air agitation in the sludge sump, outward transport or compost after the aerobic sigestion, precipitation water outlet are outer after clean water basin compile to be drained into the aeration fish pond and carries out biological reinforced processing, passes through at last the overfall dike overflow discharge.
2. village sewage according to claim 1 is processed and broken end creek water surrounding in-situ remediation method, it is characterized in that, Grill space is 40-50mm.
3. village sewage according to claim 1 is processed and broken end creek water surrounding in-situ remediation method, it is characterized in that, hydraulic detention time is 4.0-5.0h in the equalizing tank unit; Sewage pump is settled in body bottom, pond.
4. village sewage according to claim 3 is processed and broken end creek water surrounding in-situ remediation method, it is characterized in that, the anaerobic pond unit is to utilize anerobe and facultative anaerobe by nitrated and denitrification, to remove the organic pollutant of hard degradation in the sewage, its total hrt is 6.0-8.0h.
5. village sewage according to claim 4 is processed and broken end creek water surrounding in-situ remediation method, it is characterized in that, establish semi soft packing in the catalytic oxidation pool unit, aeration carries out oxygenation to sewage at the bottom of the pond, and making body interior sewage in pond be in flow state, its total hrt is 4.0-6.0h.
6. village sewage according to claim 5 is processed and broken end creek water surrounding in-situ remediation method, it is characterized in that, after the settling tank unit was arranged on contact-oxidation pool, its total hrt was 1.0-1.5h.
7. village sewage according to claim 6 is processed and broken end creek water surrounding in-situ remediation method, it is characterized in that, sludge sump unit total hrt is 5-6d.
8. village sewage according to claim 7 is processed and broken end creek water surrounding in-situ remediation method, it is characterized in that, has in the unit, aeration fish pond and purifies the chinampa.
CN2012103927759A 2012-10-17 2012-10-17 Taihu Lake region village sewage treatment and Duantou creek water environment repair method Pending CN102897978A (en)

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CN106007267A (en) * 2016-08-01 2016-10-12 安徽泛亚环保科技有限公司 Large integrated sewage treatment device and sewage treatment technology
CN106192872A (en) * 2016-07-14 2016-12-07 苏州大学 A kind of original position connection method of beheaded river
CN106681405A (en) * 2016-12-30 2017-05-17 成都机缘环保科技有限公司 Sewage treatment monitoring device and remote monitoring system
CN107381959A (en) * 2017-08-22 2017-11-24 北京中科乾和环保科技服务有限公司 A kind of seepage pit sewage disposal system
CN107445357A (en) * 2017-10-05 2017-12-08 申青林 A kind of rural area and the method for small river non-transformer sewage disposal
CN107935306A (en) * 2017-11-28 2018-04-20 中国市政工程中南设计研究总院有限公司 A kind of combined in-situ gravel bed sewage treatment facility
CN113443785A (en) * 2021-07-05 2021-09-28 张建平 Method for treating agricultural tail water
CN115304211A (en) * 2022-06-29 2022-11-08 鹏凯环境科技股份有限公司 Method for treating river and lake pollution point source by clear water type water ecosystem

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104649511A (en) * 2014-12-23 2015-05-27 安徽省天虹绿洲环保科技有限公司 Rural domestic wastewater treatment process
CN105859059A (en) * 2016-06-15 2016-08-17 合肥市畜牧水产技术推广中心 Biochemical treatment method of testudinate industrial aquaculture wastewater
CN106192872A (en) * 2016-07-14 2016-12-07 苏州大学 A kind of original position connection method of beheaded river
CN106007267A (en) * 2016-08-01 2016-10-12 安徽泛亚环保科技有限公司 Large integrated sewage treatment device and sewage treatment technology
CN106681405A (en) * 2016-12-30 2017-05-17 成都机缘环保科技有限公司 Sewage treatment monitoring device and remote monitoring system
CN107381959A (en) * 2017-08-22 2017-11-24 北京中科乾和环保科技服务有限公司 A kind of seepage pit sewage disposal system
CN107445357A (en) * 2017-10-05 2017-12-08 申青林 A kind of rural area and the method for small river non-transformer sewage disposal
CN107935306A (en) * 2017-11-28 2018-04-20 中国市政工程中南设计研究总院有限公司 A kind of combined in-situ gravel bed sewage treatment facility
CN113443785A (en) * 2021-07-05 2021-09-28 张建平 Method for treating agricultural tail water
CN115304211A (en) * 2022-06-29 2022-11-08 鹏凯环境科技股份有限公司 Method for treating river and lake pollution point source by clear water type water ecosystem

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Application publication date: 20130130