CN104030524B - Seasonal aeration domestic sewage deep denitrification process and device - Google Patents
Seasonal aeration domestic sewage deep denitrification process and device Download PDFInfo
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Abstract
The invention relates to a seasonal aeration domestic sewage deep denitrification process and device. The device consists of an anaerobic acidification tank, an aeration vertical undercurrent wetland, an aeration-free vertical underflow wetland and a horizontal underflow wetland. Domestic sewage flows into the anaerobic acidification tank; effluent of the anaerobic acidification tank is split and subsequently fed into the aeration vertical undercurrent wetland and the aeration-free vertical underflow wetland respectively; effluent from the aeration vertical undercurrent wetland and effluent from the aeration-free vertical underflow wetland are mixed and subsequently fed into the horizontal underflow wetland. The effluent of the horizontal underflow wetland can be used for replenishing a static landscape water body and the like. Due to arrangement of flow division valves, the aeration vertical undercurrent wetland and the aeration-free vertical underflow wetland, the problem of controlling the ratio of NH4<+>-N to NO3<->N is successfully solved, and the monitoring and management difficulty of the system is alleviated; the device is convenient to maintain, the vertical underflow wetland is aerated continuously when the average weekly temperature is higher than or equal to 15 DEG C, the system TN (Total Nitrogen) removal rate can be greater than 95%, the pollutant removal effect is stable, and the effluent quality can meet the standard of IV-class surface water; the aeration of the vertical underflow wetland is stopped when the average weekly temperature is lower than 15 DEG C, the effluent quality of the system can still meet the one-class B standard of effluent of a sewage plant.
Description
Technical field
The invention belongs to water treatment field, be specifically related to a kind of seasonal aeration domestic sewage deep denitrogenation process and device.
Background technology
Artificial swamp (Constructed Wetlands, CWs) is a kind of sewage disposal system be jointly made up of filler, plant and microorganism.Pollutant in system is removed via the physics such as assimilation degraded of filtration, absorption, plant absorption, microorganism, chemistry, biological agent.Because its operation investment cost is low, management maintenance is convenient, good to the plant nutrient such as nitrogen, phosphorus removal effect, is widely used in advanced nitrogen dephosphorization and the dispersed wastewater process of secondary treated wastewater at present.
Organic nitrogen and ammonia nitrogen are the chief component of total nitrogen in sanitary sewage, and organic nitrogen becomes ammonia nitrogen after digestion.When utilizing wetland to carry out dispersed wastewater process, the nitrated needs of ammonia nitrogen consumes a large amount of oxygen, and utilize merely natural reaeration to realize the nitrated of ammonia nitrogen, processing load is too low, needs to adopt preaeration enhancements.Aeration, as a kind of conventional sewage water treatment method, in order to remove pernicious gas in sewage and volatile materials, can increase oxygen in water, promotes growth of aerobic microorganisms enrichment, improve the degradation rate of reductive organic matter.
Published patent of invention file (CN 102260021 A), for the problem of carbon source deficiency in wetland denitrification process, proposes a kind of domestic sewage advanced denitrification process method without the need to additional carbon, passes through NH
4 +-N electrode is monitored, and controls suitable NH
4 +-N and NO
3 -the ratio of-N, successfully achieves the application of anaerobic ammonium oxidation process in artificial swamp.But under cryogenic conditions, in vertical-flow wetland, the load of aerating oxidation ammonia nitrogen is extremely low, and cost effectiveness is than low.And anaerobic ammonia oxidizing bacteria is mesophile, the reduction of temperature directly can affect its active and treatment effeciency.In addition, Income gap seasonality is comparatively obvious, and has certain correlation with temperature, and the domestic consumption in winter obviously will be less than summer, and the seasonal fluctuation of sanitary sewage discharge capacity is large.Therefore, adopt the single method of operation can affect the operational effect for the treatment of system, cause the waste of resource.In addition, NH is utilized
4 +nH in the water outlet of-N electrode Monitoring and Controlling pretreatment system
4 +-N and NO
3 -the ratio of-N, also adds operational management difficulty to a certain extent.
The present invention is directed to the problems referred to above, propose the method for seasonal aeration innovatively, while effectively reducing energy consumption, ensure system treatment effect under cryogenic.The present invention also proposes a kind of method of sewage separation simultaneously, successfully solves NH
4 +-N and NO
3 -the problem of the ratio control of-N, without the need to NH
4 +-N electrode is monitored, and reduces the monitoring and control difficulty for the treatment of system, considerably increases the practicality of technology.
Summary of the invention
The object of the present invention is to provide a kind of seasonal aeration domestic sewage deep denitrogenation process method and apparatus.
The seasonal aeration domestic sewage deep denitrogenation process that the present invention proposes, concrete steps are as follows:
(1) primary sanitary sewage is after the process of anaerobic acidification pond, after being shunted by flow divider by anaerobic acidification pond delivery port, aeration vertical flow artificial swamp is flowed into respectively and without aeration vertical flow artificial swamp, current flow through wet land filler from top to bottom by the first delivery port and the second delivery port;
(2) aeration vertical subsurface flow wetland takes the method for operation of seasonal aeration:
When all mean temperatures are higher than 12 – 15 DEG C, control aeration vertical flow artificial swamp is intake and is 1:1 without aeration vertical flow artificial swamp water inlet volume ratio, and aeration vertical subsurface flow wetland carries out abundant aeration, makes the NH in sewage
4 +it is NO that-N is able to completely nitrated
3 -n, controlling vertical subsurface flow wetland volumetric loading is 0.09-0.16 kgNH
4 +-N/ m
3d, aeration ammonia nitrogen loading is 1.0-2.5g NH
4 +-N/ m
3air;
When week, mean temperature was lower than 12-15 DEG C, regulate flow divider, control aeration vertical flow artificial swamp is intake and is 1:3 without aeration vertical flow artificial swamp water inlet volume ratio, close the aerator in aeration vertical subsurface flow wetland, suitable increase hydraulic detention time, controlling vertical subsurface flow wetland volumetric loading is 0.03-0.06 kgNH
4 +-N/ m
3d;
(3) in step (1), the water outlet of the second delivery port enters without aeration vertical subsurface flow wetland, SS residual in further removal sewage, and remove unnecessary biodegradable organic matter, for follow-up autotrophic microbe provides favourable flow condition, controlling its volumetric loading is 0.03-0.06 kgNH
4 +-N/ m
3d;
(4) by the water outlet in step (2) and step (3) through mixing after, enter horizontal subsurface flow wetland, for anaerobic ammonium oxidation process provides good hypoxic/anaerobic environment and NH
4 +-N and NO
3 -n ratio, through the actual NH of mixed water inlet
4 +-N and NO
3 -the ratio of-N is 1:1-1.4:1, BOD
5be 0.2:1-0.5:1 with N ratio; Horizontal subsurface flow wetland volumetric loading is 0.004-0.011kgNH
4 +-N/ m
3d;
(5) step (4) water outlet, can be used as municipal usage or directly enters neighbouring natural or landscape water body.
In the present invention, primary sanitary sewage described in step (1) enters anaerobic acidification pond and carries out pretreatment, and regulate sewage quality and the water yield, control hydraulic detention time is 5-6 hour, and anaerobic acidification pool volume load is 0.65-1.74kgCOD/m
3d, to remove solid suspension in sewage, degraded partial organic substances, significantly improves NH
4 +the ratio of-N/TN.
The present invention proposes a kind of seasonal aeration domestic sewage deep denitrogenation device, by anaerobic acidification pond 23, flow divider 7, aeration vertical subsurface flow wetland 24, connect to form through pipeline and valve successively without aeration vertical flow artificial swamp 25, horizontal drowned flow artificial wet land 26, wherein:
Anaerobic acidification pond 23 delivery port is provided with flow divider 7, and flow divider 7 is provided with two delivery ports, and two delivery ports of described flow divider connect aeration vertical flow wetland 24 and side, the top water inlet without aeration vertical flow wetland 25 respectively; Aeration vertical flow wetland 24 and be equipped with perforation water distributor without in aeration vertical flow wetland 25, is provided with aeration tube bottom aeration vertical flow wetland 24, and described aeration tube is connected aerator 8 by air door 9, mass air flow sensor 10 with pipeline; Aeration vertical flow wetland 24 is connected horizontal subsurface flow wetland 26 top water inlet with the delivery port without aeration vertical flow wetland 25 respectively by upper curved outlet pipe;
Described aeration vertical flow wetland 24 and be provided with the first wet land filler without in aeration vertical flow wetland 25;
Be provided with the second wet land filler 20, second wet land filler 20 both sides in described horizontal subsurface flow wetland 26 and be provided with water distribution area filler, the second wet land filler and water distribution area filler junction are provided with perforation water distributing plate.
In the present invention, in described anaerobic acidification pond 23, be provided with 3 deflection plates; The first blow-down pipe 2 and the second blow-down pipe 6 is provided with bottom it.
Aeration vertical flow artificial swamp 24, without in aeration vertical flow artificial swamp 25 and horizontal drowned flow artificial wet land 26 all plantation be applicable to the ornamental plant calamus 19 of subtropical climate.
Beneficial effect of the present invention is:
1. pair open " a kind of domestic sewage advanced denitrification process method without the need to additional carbon and device " is improved.By arranging flow divider, aeration and without aeration vertical flow wetland, successfully solve horizontal subsurface flow wetland water inlet NH
4 +-N and NO
3 -the problem of the ratio control of-N, without the need to NH
4 +-N electrode is monitored, and reduces the operational management difficulty for the treatment of system, adds the practicality of technology.
2. under cryogenic conditions, the aeration ammonia nitrogen loading in vertical-flow wetland is extremely low, and cost effectiveness is than low, and Anammox effect is subject to suppression, the interior NO in winter occurred of horizontal subsurface flow wetland system of low temperature
3 _the situation of N accumulation, the method of operation of seasonal aeration is proposed innovatively, while effectively reducing aeration energy consumption in winter, decline with temperature with dispersed wastewater water consumption and the characteristic that reduces coordinates, can ensure that system still can reach good treatment effect under cryogenic.
3. this process system structure simplifies further, and operational management is more easy.When week, mean temperature was greater than or equal to 15 DEG C, system run all right, pollutant removal is good, and effluent quality can reach surface water IV class standard.When week, mean temperature was lower than 15 DEG C, adopt without aeration operational mode.Autotrophic bacterium highly enriched in wetland still effectively can remove water pollutant, and effluent quality can reach one-level B standard.
Accompanying drawing explanation
Fig. 1 is a kind of schematic flow sheet of seasonal aeration domestic sewage deep denitrogenation process method.
The bio-ecological combination device flow chart that Fig. 2 processes primary sanitary sewage for utilizing process described in the present invention, wherein (a) is front view, and (b) is top view.
Number in the figure: 1 is water inlet, 2, 6 are respectively the first blow-down pipe and the second blow-down pipe, 3 is effluent stream, 7 is flow divider, 4 and 5 is the first delivery port and second delivery port of flow divider, 8 is aerator, 9 is air door, 10 is mass air flow sensor, 11, 12 are respectively first, second perforation water distributor, 13, 20 are respectively first, second wet land filler, 14, 15 and 22 is curved outlet pipe (delivery port) on first, curved outlet pipe on curved outlet pipe (delivery port) and the 3rd on second, 16 is water distributor, 17 is water distribution area filler, 18, 21 are respectively the first perforation water distributing plate and the second perforation water distributing plate, 19 is wetland plant calamus, 23 is anaerobic acidification pond, 24 is aeration vertical flow wetland, 25 is without aeration vertical flow wetland, 26 is horizontal subsurface flow wetland.
Detailed description of the invention
The present invention is further illustrated by reference to the accompanying drawings below by case study on implementation.
Case study on implementation 1: the implementation case is the process utilizing described seasonal aeration domestic sewage advanced nitrogen, carries out advanced nitrogen dephosphorization process to dispersion type domestic wastewater.Detailed description of the invention is as follows:
Treating apparatus comprises: anaerobic acidification pond 23, aeration vertical subsurface flow wetland 24, without aeration vertical flow artificial swamp 25, horizontal subsurface flow wetland 26, sewage pump, aerator 8, mass air flow sensor 10, wet land filler, wetland plant calamus 19.Wherein anaerobic acidification pond 23 adopts transparent PVC plate to make, and anaerobic fixed film reactor 23 is of a size of 0.55m × 0.25m × 0.7m, the inner each spherical suspending filling material of filling about 50% volume, diameter 80mm of device; Hydrolytic tank water outlet establishes flow divider 7.Aeration vertical flow artificial swamp 24 is PVC cylinder, diameter 40cm, high 65cm, bottom is provided with aeration head, and inside is provided with the first wet land filler 13, is filled with that 50mm particle diameter is 20-30mm stone, 50mm particle diameter is 10-15mm gravel, 450mm particle diameter is the gravel of 3-9mm from bottom to up.Be PVC cylinder without aeration vertical flow artificial swamp 25, diameter 70cm, high 65cm, without aerator, be provided with the second wet land filler 20 in it, described second wet land filler 20 is with the first wet land filler 13 in aeration vertical flow artificial swamp 24.Horizontal drowned flow artificial wet land 26 is of a size of 1.5m × 0.4m × 0.7m, is provided with the 3rd wet land filler in it, and described 3rd wet land filler is laying 550mm particle diameter is the gravel of 3-9mm.Aeration vertical flow artificial swamp 24, without in aeration vertical flow artificial swamp 25 and horizontal drowned flow artificial wet land 26 all plantation be applicable to the ornamental plant calamus 19 of subtropical climate.
The concrete connected mode of each device and equipment is with reference to Fig. 2 (bio-ecological combination device Liu Cheng Tu – side view and top view):
Identical with described in invention disclosed patent document (CN 102260021 A) of anaerobic acidification pond 23, water flow mode in anaerobic acidification pond 23 is baffling, sewage is pumped into by top water inlet 1, via 3 deflection plates, finally shunts from top delivery port via flow divider 7.Forward and backward bottom, anaerobic acidification pond 23 is provided with the first blow-down pipe 2 and the second blow-down pipe 6, and blow-down pipe is used for excess sludge and sedimentally regularly empties, discharge;
The water outlet in anaerobic acidification pond 23, after flow divider 7 is shunted, flows into aeration vertical flow wetland 24 from the first delivery port 4, flows into without aeration vertical flow wetland 25 from the second delivery port 5.Enter aeration vertical flow wetland 24 and without aeration vertical flow wetland 25 via the first perforation water distributor 11, second water distributor 12 of boring a hole respectively, current, from top to bottom through medium, finally flow into horizontal drowned flow artificial wet land 26 from outlet pipe.Be provided with aeration tube bottom aeration vertical flow wetland 24, outside is provided with aerator 8, and air enters aeration tube via mass air flow sensor 10 and air door 9.Aeration vertical flow wetland 24 and to be provided with on first curved outlet pipe 15 on curved outlet pipe 14 and second, in order to aeration vertical flow wetland 24 with without the effective water level in aeration vertical flow wetland 25 without aeration vertical flow wetland 25.
Aeration vertical flow wetland 24 and enter horizontal subsurface flow wetland 26 via curved outlet pipe 15 on curved outlet pipe on first 14 and second without the water outlet of aeration vertical flow wetland 25, the water distribution area of horizontal subsurface flow wetland 26 is entered through water distributor 16, effective processing region of horizontal subsurface flow wetland 26 is evenly flowed into by perforation water distributing plate 18, flow into exhalant region at the perforation water distributing plate 21 through rear portion, flow out finally by curved outlet pipe 22 on the 3rd.For keeping effective height of water level in wetland, curved outlet pipe 22 on the 3rd is set at horizontal subsurface flow wetland 26 rear portion.Laying 550mm particle diameter in the effective processing region of wetland is the gravel of 3-9mm, and it is 20-30mm stone that wetland water distribution, exhalant region lay 550mm particle diameter, and kind is implanted with ornamental plant calamus 19.
Domestic sewage advanced nitrogen rejection facility adopts the method for operation of seasonal aeration, and all mean temperatures open aerator greater than or equal to when 15 DEG C, and the concrete technology parameter of plant running and treating apparatus overall treatment effect are as shown in table 1,2; Week, mean temperature closed aerator lower than when 15 DEG C, and the carrying out practically technological parameter of device and treating apparatus overall treatment effect are in table 3,4.
Table 1 each device technique operational factor table (all mean temperatures are greater than or equal to 15 DEG C)
| Operational factor | Anaerobic acidification pond | Aeration vertical flow wetland | Without aeration vertical flow wetland | Horizontal subsurface flow wetland |
| Hydraulic detention time (HRT/h) | 5.5 | 8 | 24 | 36 |
| Hydraulic surface loading (m 3/m 2·d） | 2.20 | 1.85 | 0.61 | 0.15 |
| Gas-water ratio (aeration) | / | 10 | / | / |
The water-in and water-out water treatment of table 2 system and treatment effect (all mean temperatures are greater than or equal to 15 DEG C)
| Water quality index | Water inlet | Water outlet | Clearance (%) |
| CODcr (mg/L) | 219±58 | 24±8 | 88±5 |
| TN (mg/L) | 26.63±2.86 | 1.30±0.69 | 95±4 |
| NH 3-N (mg/L) | 19.22±2.29 | 0.63±0.76 | 97±4 |
| TP (mg/L) | 4.49±0.94 | 0.27±0.14 | 94±3 |
Table 3 each device technique operational factor table (all mean temperatures are lower than 15 DEG C)
| Operational factor | Anaerobic acidification pond | Aeration vertical flow wetland | Without aeration vertical flow wetland | Horizontal subsurface flow wetland |
| Hydraulic detention time (HRT/h) | 5.5 | 24 | 24 | 55 |
| Hydraulic surface loading (m 3/m 2·d） | 2.20 | 0.61 | 0.61 | 0.1 |
The water-in and water-out water treatment of table 4 system and treatment effect (all mean temperatures are lower than 15 DEG C)
| Water quality index | Water inlet | Water outlet | Clearance (%) |
| CODcr (mg/L) | 260±76 | 34±15 | 86±6 |
| TN (mg/L) | 31.41±4.57 | 14.78±6.09 | 54±14 |
| NH 3-N (mg/L) | 23.07±3.27 | 10.35±5.25 | 56±17 |
| TP (mg/L) | 3.20±0.29 | 0.15±0.09 | 95±3 |
Associative list 2,4 known, sanitary sewage is through this system body processing unit, and denitrification process and effect meet design concept of the present invention, successfully achieves TN, NH under low-carbon-source condition
4 +the removal of-N: when all mean temperatures are greater than or equal to 15 DEG C, system effluent quality can reach surface water IV class standard, and water outlet can directly as static landscape water body make-up water source; When week, mean temperature was lower than 15 DEG C, system effluent quality also can reach sewage effluents one-level B standard.
Claims (4)
1. a seasonal aeration domestic sewage deep denitrogenation process, is characterized in that concrete steps are as follows:
(1) primary sanitary sewage is after the process of anaerobic acidification pond, after being shunted by flow divider by anaerobic acidification pond delivery port, aeration vertical flow artificial swamp is flowed into respectively and without aeration vertical flow artificial swamp, current flow through wet land filler from top to bottom by the first delivery port and the second delivery port;
(2) aeration vertical subsurface flow wetland takes the method for operation of seasonal aeration:
When all mean temperatures are higher than 12 – 15 DEG C, control aeration vertical flow artificial swamp is intake and is 1:1 without aeration vertical flow artificial swamp water inlet volume ratio, and aeration vertical subsurface flow wetland carries out abundant aeration, makes the NH in sewage
4 +it is NO that-N is able to completely nitrated
3 --N, controlling vertical subsurface flow wetland volumetric loading is 0.09-0.16 kgNH
4 +-N/ m
3d, aeration ammonia nitrogen loading is 1.0-2.5g NH
4 +-N/ m
3air;
When week, mean temperature was lower than 12 – 15 DEG C, regulate flow divider, control aeration vertical flow artificial swamp is intake and is 1:3 without aeration vertical flow artificial swamp water inlet volume ratio, close the aerator in aeration vertical subsurface flow wetland, suitable increase hydraulic detention time, controlling vertical subsurface flow wetland volumetric loading is 0.03-0.06 kgNH
4 +-N/ m
3d;
(3) in step (1), the water outlet of the second delivery port enters without aeration vertical subsurface flow wetland, SS residual in further removal sewage, and remove unnecessary biodegradable organic matter, for follow-up autotrophic microbe provides favourable flow condition, controlling its volumetric loading is 0.03-0.06 kgNH
4 +-N/ m
3d;
(4) by the water outlet in step (2) and step (3) through mixing after, enter horizontal subsurface flow wetland, for anaerobic ammonium oxidation process provides good NH
4 +-N and NO
3 --N ratio, through the actual NH of mixed water outlet
4 +-N and NO
3 -the ratio of-N is 1:1-1.4:1, BOD
5be 0.2:1-0.5:1 with N ratio; Horizontal subsurface flow wetland volumetric loading is 0.004-0.011kgNH
4 +-N/ m
3d;
(5) step (4) water outlet, can be used as municipal usage or directly enters neighbouring natural or landscape water body.
2. the seasonal aeration domestic sewage deep denitrogenation process of one according to claim 1, to it is characterized in that described in step (1) that primary sanitary sewage enters anaerobic acidification pond and carry out pretreatment, regulate sewage quality and the water yield, control hydraulic detention time is 5-6 hour, and anaerobic acidification pool volume load is 0.65-1.74kgCOD/m
3d, to remove solid suspension in sewage, degraded partial organic substances, significantly improves NH
4 +the ratio of-N/TN.
3. the device of a seasonal aeration domestic sewage deep denitrogenation process use as claimed in claim 1, it is characterized in that by anaerobic acidification pond (23), flow divider (7), aeration vertical subsurface flow wetland (24), connect to form through pipeline and valve successively without aeration vertical flow artificial swamp (25), horizontal drowned flow artificial wet land (26), wherein:
Anaerobic acidification pond (23) delivery port is provided with flow divider (7), flow divider (7) is provided with two delivery ports, and two delivery ports of described flow divider connect aeration vertical flow wetland (24) and side, the top water inlet without aeration vertical flow wetland (25) respectively; Aeration vertical flow wetland (24) and be equipped with perforation water distributor without in aeration vertical flow wetland (25), aeration vertical flow wetland (24) bottom is provided with aeration tube, and described aeration tube is connected aerator (8) by air door (9), mass air flow sensor (10) with pipeline; Aeration vertical flow wetland (24) is connected horizontal subsurface flow wetland (26) top water inlet with the delivery port without aeration vertical flow wetland (25) respectively by upper curved outlet pipe;
Described aeration vertical flow wetland (24) and be provided with the first wet land filler without in aeration vertical flow wetland (25);
Be provided with the second wet land filler (20) in described horizontal subsurface flow wetland (26), the second wet land filler (20) both sides are provided with water distribution area filler, and the second wet land filler and water distribution area filler junction are provided with perforation water distributing plate.
4. the device of a kind of seasonal aeration domestic sewage deep denitrogenation process use according to claim 3, is characterized in that being provided with 3 deflection plates in described anaerobic acidification pond (23); The first blow-down pipe (2) and the second blow-down pipe (6) is provided with bottom it.
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| CN104891741B (en) * | 2015-05-28 | 2017-05-03 | 长春黄金研究院 | Environment-friendly treatment method for thiocyanate-contained wastewater |
| CN106746190B (en) * | 2016-12-06 | 2023-03-31 | 浙江工业大学 | Multi-carrier biological ammonia nitrogen and turbidity removal equipment for drinking water and treatment method thereof |
| CN107585952B (en) * | 2017-09-08 | 2023-10-17 | 温州大学 | Sewage treatment device and sewage treatment process thereof |
| CN107915376B (en) * | 2017-12-05 | 2021-07-02 | 湖南大辰环保股份有限公司 | Micro-power integrated sewage treatment method |
| CN110436620B (en) * | 2019-08-30 | 2024-06-11 | 杭州沁霖生态科技有限公司 | Synchronous denitrification wetland and treatment process thereof |
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| JP2009056440A (en) * | 2007-09-03 | 2009-03-19 | Dowa Electronics Materials Co Ltd | Water purification method and water purification apparatus |
| CN101921042A (en) * | 2010-07-13 | 2010-12-22 | 南京大学 | Alternate combined wetland system and method for efficiently removing nitrogen and phosphorus in urban wastewater |
| CN102260021A (en) * | 2011-06-01 | 2011-11-30 | 同济大学 | Process and device for deep denitrogenation of domestic wastewater without additional carbon source |
| CN102557330A (en) * | 2010-12-20 | 2012-07-11 | 中国科学院城市环境研究所 | An/O type composite artificial wetland system for enhanced treatment of low-C/N ratio wastewater |
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|---|---|---|---|---|
| JP2009056440A (en) * | 2007-09-03 | 2009-03-19 | Dowa Electronics Materials Co Ltd | Water purification method and water purification apparatus |
| CN101921042A (en) * | 2010-07-13 | 2010-12-22 | 南京大学 | Alternate combined wetland system and method for efficiently removing nitrogen and phosphorus in urban wastewater |
| CN102557330A (en) * | 2010-12-20 | 2012-07-11 | 中国科学院城市环境研究所 | An/O type composite artificial wetland system for enhanced treatment of low-C/N ratio wastewater |
| CN102260021A (en) * | 2011-06-01 | 2011-11-30 | 同济大学 | Process and device for deep denitrogenation of domestic wastewater without additional carbon source |
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