CN104030524A - 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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- CN104030524A CN104030524A CN201410240787.9A CN201410240787A CN104030524A CN 104030524 A CN104030524 A CN 104030524A CN 201410240787 A CN201410240787 A CN 201410240787A CN 104030524 A CN104030524 A CN 104030524A
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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 treatment systems being jointly comprised of filler, plant and microorganism.Pollutent in system is removed via filtration, absorption, plant absorption, the physics such as assimilation degraded of microorganism, chemistry, biological action.Because its operation investment cost is low, management maintenance is convenient, good to plant nutrient removal effects such as nitrogen, phosphorus, and the advanced nitrogen dephosphorization and the dispersed wastewater that are widely used at present secondary treated wastewater are processed.
Organonitrogen and ammonia nitrogen are the chief component of total nitrogen in sanitary sewage, and organonitrogen becomes ammonia nitrogen after digestion.While utilizing wetland to carry out dispersed wastewater processing, the nitrated of ammonia nitrogen need to consume a large amount of oxygen, utilizes merely natural reaeration to realize the nitrated of ammonia nitrogen, processes load too low, need to adopt preaeration enhancements.Aeration, as a kind of conventional sewage water treatment method, can increase oxygen in water in order to remove obnoxious flavour and the volatile matter in sewage, promotes growth of aerobic microorganisms enrichment, improves 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, has proposed a kind of domestic sewage advanced denitrification process method without additional carbon, passes through NH
4 +the monitoring of-N electrode, controls suitable NH
4 +-N and NO
3 -the ratio of-N, has successfully realized the application of anaerobic ammonium oxidation process in artificial swamp.But under cold condition, in vertical-flow wetland, the load of aeration oxidation ammonia nitrogen is extremely low, and cost effectiveness is than low.And anaerobic ammonia oxidizing bacteria is mesophilic bacteria, the reduction meeting of temperature directly affects its activity and processing efficiency.In addition, resident living water amount seasonality is more obvious, and has certain dependency with temperature, and the domestic consumption in winter will obviously be less than summer, and the seasonal fluctuation of sanitary sewage quantity discharged is large.Therefore, adopt single operation scheme can affect the operating performance for the treatment of system, cause the waste of resource.In addition, utilize NH
4 +nH in the water outlet of-N electrode Monitoring and Controlling pretreatment system
4 +-N and NO
3 -the ratio of-N, has also increased operational management difficulty to a certain extent.
The present invention is directed to the problems referred to above, propose innovatively the method for seasonal aeration, when effectively reducing energy consumption, the treatment effect of assurance system under cold condition.The present invention has also proposed a kind of method of sewage separation simultaneously, has successfully solved NH
4 +-N and NO
3 -the problem of the ratio control of-N, without NH
4 +-N electrode is monitored, and has reduced monitoring and the management difficulty for the treatment of system, has greatly increased 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 process in anaerobic acidification pond, after being shunted by diverting valve by anaerobic acidification pond water outlet, by the first water outlet and the second water outlet, flow into respectively aeration vertical flow artificial swamp and without aeration vertical flow artificial swamp, current flow through wet land filler from top to bottom;
(2) aeration vertical subsurface flow wetland is taked the operation scheme of seasonal aeration:
When all medial temperatures are during higher than 15 ℃ of 12 –, to control the water inlet of aeration vertical flow artificial swamp and be 1:1 without aeration vertical flow artificial swamp water inlet volume ratio, 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, medial temperature was lower than 12-15 ℃, regulate diverting valve, control aeration vertical flow artificial swamp is intake and is 1:3 without aeration vertical flow artificial swamp water inlet volume ratio, close the aerating apparatus in aeration vertical subsurface flow wetland, suitably 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 water outlet enters without aeration vertical subsurface flow wetland, further remove residual SS in sewage, and remove unnecessary biodegradable organism, for follow-up autotrophic microorganism 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) after mixing, 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
5with N ratio be 0.2:1-0.5:1; 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 miscellaneous water or directly enters near natural or landscape water body.
In the present invention, primary sanitary sewage described in step (1) enters anaerobic acidification pond and carries out pre-treatment, regulates sewage quality and the water yield, and control hydraulic detention time is 5-6 hour, and anaerobic acidification pool volume load is 0.65-1.74kgCOD/m
3d, to remove suspended solid 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, diverting valve 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 water outlets are provided with diverting valve 7, and diverting valve 7 is provided with two water outlets, and two water outlets of described diverting valve connect respectively aeration vertical flow wetland 24 and without the top one side water-in of aeration vertical flow wetland 25; Aeration vertical flow wetland 24 and without being equipped with perforation water distributor in aeration vertical flow wetland 25, aeration vertical flow wetland 24 bottoms are provided with aeration tube, and described aeration tube is connected aerator 8 by air door 9, air flowmeter 10 with pipeline; Aeration vertical flow wetland 24 is connected horizontal subsurface flow wetland 26 top water-ins by upper curved rising pipe respectively with the water outlet without aeration vertical flow wetland 25;
Described aeration vertical flow wetland 24 and without being provided with the first wet land filler in aeration vertical flow wetland 25;
In described horizontal subsurface flow wetland 26, be provided with the second wet land filler 20, the second wet land filler 20 both sides and be provided with cloth pool filler, the second wet land filler and filler junction, cloth pool are provided with perforation water distribution board.
In the present invention, in described anaerobic acidification pond 23, be provided with 3 traverse baffles; Its bottom is provided with the first blow-down pipe 2 and the second blow-down pipe 6.
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 and device without additional carbon " improved.By diverting valve, aeration being set and without aeration vertical flow wetland, successfully having solved horizontal subsurface flow wetland water inlet NH
4 +-N and NO
3 -the problem of the ratio control of-N, without NH
4 +-N electrode is monitored, and has reduced the operational management difficulty for the treatment of system, has increased the practicality of technology.
2. under cold condition, the aeration ammonia nitrogen loading in vertical-flow wetland is extremely low, and cost effectiveness is than low, and Anammox effect is subject to the interior NO in winter occurring of inhibition, horizontal subsurface flow wetland system of low temperature
3 _the situation of N accumulation, the operation scheme of seasonal aeration is proposed innovatively, when effectively reducing aeration energy consumption in winter, the characteristic reducing with temperature with dispersed wastewater water consumption coordinates, and the system that can guarantee still can reach good treatment effect under cold condition.
3. this process system structure is further simplified, and operational management is more easy.When week, medial temperature was greater than or equal to 15 ℃, system run all right, pollutant removal is good, and effluent quality can reach surface water IV class standard.When week, medial temperature was lower than 15 ℃, adopt without aeration operational mode.The autotrophic bacteria of wetland camber enrichment still can effectively be removed 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.
Fig. 2 is the bio-ecological combination device schema that utilizes processing method described in the present invention to process primary sanitary sewage, and wherein (a) is front view, is (b) vertical view.
Number in the figure: 1 is water-in, 2, 6 are respectively the first blow-down pipe and the second blow-down pipe, 3 is effluent stream, 7 is diverting valve, 4 and 5 is the first water outlet and second water outlet of diverting valve, 8 is aerator, 9 is air door, 10 is air flowmeter, 11, 12 are respectively first, the second perforation water distributor, 13, 20 are respectively first, the second wet land filler, 14, 15 and 22 is curved rising pipe (water outlet) on first, curved rising pipe on curved rising pipe (water outlet) and the 3rd on second, 16 is water distributor, 17 is cloth pool filler, 18, 21 are respectively the first perforation water distribution board and the second perforation water distribution board, 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.
Embodiment
Below by case study on implementation, further illustrate by reference to the accompanying drawings the present invention.
Case study on implementation 1: the implementation case is to utilize the processing method of described seasonal aeration domestic sewage advanced nitrogen, and dispersion type domestic wastewater is carried out to advanced nitrogen dephosphorization processing.Embodiment is as follows:
Treatment unit comprises: anaerobic acidification pond 23, aeration vertical subsurface flow wetland 24, without aeration vertical flow artificial swamp 25, horizontal subsurface flow wetland 26, sump pump, aerator 8, air flowmeter 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 spherical suspending filling material of respectively filling approximately 50% volume, diameter 80mm of device; Hydrolytic tank water outlet is established diverting valve 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, and being filled with from bottom to up 50mm particle diameter is that 20-30mm stone, 50mm particle diameter are the gravel that 10-15mm gravel, 450mm particle diameter are 3-9mm.Without aeration vertical flow artificial swamp 25, be PVC cylinder, diameter 70cm, high 65cm, without aerator, be provided with the second wet land filler 20 in it, and described the 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 the 3rd wet land filler is for laying the gravel that 550mm particle diameter is 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.
Each device and the concrete mode of connection of equipment are with reference to Fig. 2 (bio-ecological combination device Liu Cheng Tu – side-view and vertical 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-in 1, via 3 traverse baffles, finally from top water outlet, via diverting valve 7, shunts.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 for excess sludge and sedimentally regularly empty, discharge;
The water outlet in anaerobic acidification pond 23, after diverting valve 7 shuntings, flows into aeration vertical flow wetland 24 from the first water outlet 4, from the second water outlet 5, flows into without aeration vertical flow wetland 25.Via the first perforation water distributor 11, second, boring a hole respectively, water distributor 12 enters aeration vertical flow wetland 24 and without aeration vertical flow wetland 25, current pass through medium from top to bottom, finally from rising pipe, flows into horizontal drowned flow artificial wet land 26.Aeration vertical flow wetland 24 bottoms are provided with aeration tube, and outside is provided with aerator 8, and air enters aeration tube via air flowmeter 10 and air door 9.Aeration vertical flow wetland 24 and be provided with on first curved rising pipe 15 on curved rising pipe 14 and second without aeration vertical flow wetland 25, in order to aeration vertical flow wetland 24 with without the effective water level in aeration vertical flow wetland 25.
Aeration vertical flow wetland 24 and enter horizontal subsurface flow wetland 26 via curved rising pipe 15 on curved rising pipe 14 and second on first without the water outlet of aeration vertical flow wetland 25, through water distributor 16, enter the cloth pool of horizontal subsurface flow wetland 26, by perforation water distribution board 18, evenly flow into effective treatment zone of horizontal subsurface flow wetland 26, at the perforation water distribution board 21 through rear portion, flow into exhalant regions, finally by curved rising pipe 22 on the 3rd, flow out.For keeping effective elevation of water surface in wetland, curved rising pipe 22 on the 3rd is set at horizontal subsurface flow wetland 26 rear portions.In the effective treatment zone of wetland, lay the gravel that 550mm particle diameter is 3-9mm, it is 20-30mm stone that 550mm particle diameter is laid in wetland water distribution, exhalant region, and kind is implanted with ornamental plant calamus 19.
Domestic sewage advanced nitrogen rejection facility adopts the operation scheme of seasonal aeration, and all medial temperatures are opened aerating apparatus during greater than or equal to 15 ℃, and the concrete technology parameter of device operation and treatment unit overall process effect are as shown in table 1,2; Week is closed aerating apparatus when medial temperature is lower than 15 ℃, and the concrete run parameter of device and treatment unit overall process effect are in Table 3,4.
Each device technique operating parameter table (all medial temperatures are greater than or equal to 15 ℃) of table 1
| Operating parameter | 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 conditioning of table 2 system and treatment effect (all medial temperatures are greater than or equal to 15 ℃)
| Water-quality guideline | 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 |
Each device technique operating parameter table (all medial temperatures are lower than 15 ℃) of table 3
| Operating parameter | 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 conditioning of table 4 system and treatment effect (all medial temperatures are lower than 15 ℃)
| Water-quality guideline | 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 is known, and sanitary sewage is through this system body processing unit, and denitrification process and effect meet design concept of the present invention, has successfully realized TN, NH under low carbon source condition
4 +the removal of-N: all medial temperatures are during greater than or equal to 15 ℃, and system effluent quality can reach surface water IV class standard, and water outlet can be directly as static landscape water body make-up water source; When week, medial temperature was lower than 15 ℃, 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 process in anaerobic acidification pond, after being shunted by diverting valve by anaerobic acidification pond water outlet, by the first water outlet and the second water outlet, flow into respectively aeration vertical flow artificial swamp and without aeration vertical flow artificial swamp, current flow through wet land filler from top to bottom;
(2) aeration vertical subsurface flow wetland is taked the operation scheme of seasonal aeration:
When all medial temperatures are during higher than 15 ℃ of 12 –, to control the water inlet of aeration vertical flow artificial swamp and be 1:1 without aeration vertical flow artificial swamp water inlet volume ratio, 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, medial temperature was lower than 15 ℃ of 12 –, regulate diverting valve, control aeration vertical flow artificial swamp is intake and is 1:3 without aeration vertical flow artificial swamp water inlet volume ratio, close the aerating apparatus in aeration vertical subsurface flow wetland, suitably 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 water outlet enters without aeration vertical subsurface flow wetland, further remove residual SS in sewage, and remove unnecessary biodegradable organism, for follow-up autotrophic microorganism 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) after mixing, 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
5with N ratio be 0.2:1-0.5:1; 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 miscellaneous water or directly enters near natural or landscape water body.
2. a kind of seasonal aeration domestic sewage deep denitrogenation process according to claim 1, it is characterized in that described in step (1) that primary sanitary sewage enters anaerobic acidification pond carries out pre-treatment, 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 suspended solid in sewage, degraded partial organic substances, significantly improves NH
4 +the ratio of-N/TN.
3. the device that seasonal aeration domestic sewage deep denitrogenation process as claimed in claim 1 is used, it is characterized in that by anaerobic acidification pond (23), diverting valve (7), aeration vertical subsurface flow wetland (24), without aeration vertical flow artificial swamp (25), horizontal drowned flow artificial wet land (26), through pipeline and valve, connect to form successively, wherein:
Anaerobic acidification pond (23) water outlet is provided with diverting valve (7), diverting valve (7) is provided with two water outlets, and two water outlets of described diverting valve connect respectively aeration vertical flow wetland (24) and without the top one side water-in of aeration vertical flow wetland (25); Aeration vertical flow wetland (24) and without being equipped with perforation water distributor 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), air flowmeter (10) with pipeline; Aeration vertical flow wetland (24) is connected horizontal subsurface flow wetland (26) top water-in by upper curved rising pipe respectively with the water outlet without aeration vertical flow wetland (25);
Described aeration vertical flow wetland (24) and without being provided with the first wet land filler in aeration vertical flow wetland (25);
In described horizontal subsurface flow wetland (26), be provided with the second wet land filler (20), the second wet land filler (20) both sides are provided with cloth pool filler, and the second wet land filler and filler junction, cloth pool are provided with perforation water distribution board.
4. the device that a kind of seasonal aeration domestic sewage deep denitrogenation process according to claim 3 is used, is characterized in that being provided with in described anaerobic acidification pond (23) 3 traverse baffles; Its bottom is provided with the first blow-down pipe (2) and the second blow-down pipe (6).
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| CN201410240787.9A CN104030524B (en) | 2014-06-03 | 2014-06-03 | Seasonal aeration domestic sewage deep denitrification process and device |
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|---|---|---|---|
| CN201410240787.9A CN104030524B (en) | 2014-06-03 | 2014-06-03 | Seasonal aeration domestic sewage deep denitrification process and device |
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|---|---|---|---|
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| CN104891741A (en) * | 2015-05-28 | 2015-09-09 | 长春黄金研究院 | Environment-friendly treatment method for thiocyanate-contained wastewater |
| CN106746190A (en) * | 2016-12-06 | 2017-05-31 | 浙江工业大学 | Drinking water multichip carrier is biological to remove ammonia nitrogen turbidity removal equipment and its processing method |
| CN107585952A (en) * | 2017-09-08 | 2018-01-16 | 温州大学 | A kind of sewage-treatment plant and its sewage treatment process |
| CN107915376A (en) * | 2017-12-05 | 2018-04-17 | 湖南大辰环保科技有限公司 | A kind of sewerage integrated processing method of microkinetic |
| CN110436620A (en) * | 2019-08-30 | 2019-11-12 | 杭州沁霖生态科技有限公司 | A kind of wetland and its treatment process of simultaneous denitrification |
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| CN104891741A (en) * | 2015-05-28 | 2015-09-09 | 长春黄金研究院 | Environment-friendly treatment method for thiocyanate-contained wastewater |
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| CN110436620A (en) * | 2019-08-30 | 2019-11-12 | 杭州沁霖生态科技有限公司 | A kind of wetland and its treatment process of simultaneous denitrification |
| 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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