CN105541040B - A kind of method and its device that short-cut nitrification and denitrification is realized in artificial swamp - Google Patents

A kind of method and its device that short-cut nitrification and denitrification is realized in artificial swamp Download PDF

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CN105541040B
CN105541040B CN201610046513.5A CN201610046513A CN105541040B CN 105541040 B CN105541040 B CN 105541040B CN 201610046513 A CN201610046513 A CN 201610046513A CN 105541040 B CN105541040 B CN 105541040B
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ponds
denitrification
artificial swamp
artificial
cut nitrification
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CN105541040A (en
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付贵萍
庾添玉
宁凯乐
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Shenzhen University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor

Abstract

The invention provides a kind of method for realizing short-cut nitrification and denitrification in artificial swamp, comprise the following steps：Artificial wet land system with I ponds and II ponds is set；Lime stone is respectively filled in the lower floor in the I ponds and upper strata；After activated sludge and sand are mixed, the intermediate layer in I ponds is filled into, forms the artificial wet land system of lime stone sand lime stone grading mode；It is filled in II ponds using same method；The NH intake according to system4 +N concentration, the content of organic carbon is adjusted to form C/N than 4:1~8:1 influent quality；Tank is aerated, its Dissolved Oxygen in Water concentration is reached 9mg/L, hydraulic detention time is 2.5 days.Using technical scheme, by the control to artificial swamp inside dissolved oxygen and basicity, short-cut nitrification and denitrification simply and easily is realized in artificial swamp, improves the clearance to sewage total nitrogen.

Description

A kind of method and its device that short-cut nitrification and denitrification is realized in artificial swamp
Technical field
The invention belongs to field of environment engineering technology, more particularly to a kind of realize short-cut nitrification and denitrification in artificial swamp Method and its device.
Background technology
Artificial swamp, can be effective as a kind of low cost, the convenient sewage recycling ecological engineering technology of during-operation service Ground removes organic matter, suspension and the nitrogen phosphorus in polluted-water, is widely used to sanitary sewage, industrial wastewater, garbage filter The improvement of liquid and the reparation of polluted lake water body.But in the relevant report of actual motion, many artificial swamps are although right Overall suspended pellet, the clearance of organic matter are higher, but relatively low to the clearance of nitrogen.Therefore artificial swamp denitrogenation how is improved Efficiency has turned into the current focus and difficulties studied both at home and abroad.
The removal of nitrogen relies primarily on the biochemical reactions of microorganism in artificial swamp, and wherein nitration denitrification is considered as Most important Approach of Removal of Nitrogen.At this stage in order to improve the nitric efficiency of artificial swamp, many scholar's research are by being aerated and increasing Add the measures such as organic carbon source to strengthen the effect of artificial swamp nitrification and denitrification, although achieve certain effect aeration with Addition organic carbon source adds the operating cost of artificial swamp, is unfavorable for the development of Artificial Wetland Techniques.
Short-cut nitrification and denitrification is as emerging bio-denitrification technology, it is important to utilizes aerobic ammonia oxidation bacteria (AOB) by ammonia Nitrogen changes into nitrite nitrogen, suppresses the growth activity of NOB (NOB), hinders NOB that nitrite nitrogen is oxidized into nitre State nitrogen, nitrite nitrogen is converted into the reaction of nitrogen in the presence of denitrifying bacterium.Compared to conventional nitration denitrification Process, short-cut nitrification and denitrification process can save 25% aeration quantity and 40% organic carbon source, and nitrite nitrogen conduct The reaction rate of denitrification substrate is 1.5~2 times that nitrate nitrogen is substrate, so as to realize the denitrogenation of economical and efficient.
But short-cut nitrification and denitrification technology is mainly used in sludge dewatering supernatant, percolate etc. contains high strength ammonia In the SBR techniques of nitrogen wastewater treatment, and the application report in artificial swamp is less.Its reason be artificial swamp as it is a kind of according to By the method for natural ecosystems purification sewage, its service condition not easy-regulating.Other sewage are incorporated in from the angle of microorganism Research of the denitrification process to short-cut nitrification and denitrification is it can be found that the necessary condition that short-cut nitrification and denitrification is realized is to suppress nitrous The growth activity of hydrochlorate oxidation bacteria (NOB), promote nitrite nitrogen accumulation, and nitrite accumulation is by system temperature, dissolved oxygen (DO), the influence of the parameter such as pH.If the service condition of artificial swamp can be optimized, stable control nitration reaction is generating nitrous In the hydrochlorate nitrogen stage, anti-nitration reaction is further completed again, then be expected to break through the bottleneck that artificial swamp realizes short-cut nitrification and denitrification.
The content of the invention
For above technical problem, the invention discloses it is a kind of artificial swamp realize short-cut nitrification and denitrification method and Its device, it is different to the sensitivity of envirment factor based on AOB and NOB, can by optimizing artificial wet land system service condition, Make that AOB is dominant in systems and NOB is completely removed in systems or optimum condition that is suppressed and realizing short distance nitration, Stable nitrite accumulation is obtained, anti-nitration reaction is further completed, short-cut nitrification and denitrification is realized in artificial swamp Effect.
On the other hand, the technical solution adopted by the present invention is：
A kind of method for realizing short-cut nitrification and denitrification in artificial swamp, comprises the following steps：
Step A：Artificial wet land system with I ponds and II ponds is set, the artificial wet land system also include tank and Aeration pump, the bottom in the I ponds are connected with the bottom in II ponds, and the top in the II ponds is connected with tank, the tank Outlet pipe is connected through aeration pump with the top in I ponds；
Step B：The lower floor in the I ponds and upper strata be respectively filled in I pond bodies product 10%~15% or so, particle diameter be 1~ 20mm lime stone；After activated sludge is mixed with the sand less than 10 mesh according to 25%~30% mass ratio, I is filled into The intermediate layer in pond, packing volume are the 70~80% of I pool volumes, form the Manual moist of lime stone-sand-lime stone grading mode Ground system；It is filled in II ponds using same method；The I ponds are higher than II ponds, and water flows to II ponds by the bottom in I ponds；
Bottom is flowed into from top to bottom from water inlet pipe for water inlet in the I ponds of artificial wet land system, and II is laterally flowed into through connecting tube Pond, upper end is flow to from II bottom of pond portion with fluidised form from the bottom up according to siphon principle, flowed out through delivery port.Pass through different fluidised form controls The current in I ponds and II ponds processed, so as to realize the two kinds of environment of aerobic and anaerobism for being advantageous to Microbial denitrogenation.
Step C：According to system water inlet NH4 +- N concentration, organic carbon (OC) concentration is adjusted by adding carbon source, to be formed C/N ratios are 4:1~8:Influent quality between 1；
Step D：Tank is aerated, its Dissolved Oxygen in Water concentration is reached 9mg/L, hydraulic detention time 2.5 My god, run 15~30 days, realize ammonia oxidizing bacteria and denitrifying bacteria increasing number, nitrite oxygen inside artificial wet land system Change bacterium to be suppressed and quantity reduction.Preferably, Air Exposure is carried out to tank using aeration pump.
Wherein, the main component of lime stone is calcium carbonate, plays a part of providing basicity, can be with the pH value of regulating system.
Preferably, the particle diameter of the lime stone is 10mm.
Using this technical scheme, oxygen is realized with current side in artificial swamp using the water flow mode in I ponds and II ponds To gradient be distributed.Basicity is provided for short distance nitration by the lime stone that tiled in artificial swamp the upper and lower, passes through regulation Carbon-nitrogen ratio 4:1~8:1 adds artificial swamp denitrifying carbon source, improves TN removal efficiency, reaches more than 94%.
Moreover, with the increase of carbon source, carbon source is caused to compete dissolving limited in consumption wetland in the nitrification stage with ammonia nitrogen Oxygen, ultimately result in ammonia nitrogen and effectively can not be removed and convert due to a lack of enough dissolved oxygens.Therefore, too high or too low C/N Than being all unfavorable for treatment effeciency of the artificial swamp to sewage.
As a further improvement on the present invention, before step C, first sanitary sewage is poured to artificial wet land system 20~40 My god, to realize matrix to NH4 +- N saturation absorption.
As a further improvement on the present invention, the content of organic carbon is adjusted by adding glucose.Using this technical side Case, carbon-nitrogen ratio 4 is adjusted by adding glucose:1~8:1, artificial swamp denitrifying carbon source is added, method is simple, and cost is low.
As a further improvement on the present invention, the content of organic carbon is adjusted, to form C/N as 6:1~8:1 water inlet water Matter.Using this technical scheme, be advantageous to improve TN removal efficiency, TN removal efficiency reaches more than 94%.
As a further improvement on the present invention, respectively at away from I bottom of pond 20~30cm of portion, away from II bottom of pond 15~25cm of portion at Matrix thief hatch is set respectively.
As a further improvement on the present invention, the aperture of the matrix thief hatch is 10~20mm.
As a further improvement on the present invention, the packed layer in the I ponds is higher than the packed layer at least 10cm in II ponds.
Present invention also offers a kind of use to realize the method for short-cut nitrification and denitrification in artificial swamp as described above Device, i.e., be connected including I ponds, II ponds, tank and aeration pump, the bottom in the I ponds with the bottom in II ponds, the II ponds it is upper Portion is connected with tank, and the outlet pipe of the tank is connected through aeration pump with the top in I ponds；In the lower floor in the I ponds and upper Layer is provided with I pond bodies and accumulates the lime stone that 10%~15% or so, particle diameter is 1~20mm；The intermediate layer in I ponds filled with activated sludge with Less than 10 mesh sand according to 25%~30% mass ratio mix after mixture, packing volume for I pool volumes 70~ 80%, form the artificial wet land system of lime stone-sand-lime stone grading mode；Filled out in II ponds using same method Fill；The I ponds are higher than II ponds, and water flows to II ponds by the bottom in I ponds.
Using this technical scheme, more stably short-cut nitrification and denitrification can be controlled to react.
Technical scheme is molten by optimizing artificial swamp for the high ammonia nitrogen of municipal sewage, the characteristic of low ratio of carbon to ammonium The service condition of oxygen and pH value is solved, making AOB, dominant and NOB is completely removed or suppressed and real in systems in systems The optimum condition of existing short distance nitration, obtains stable nitrite accumulation.Because short-cut nitrification and denitrification does not have nitrite oxygen The reaction of change, aeration quantity is few and saves energy consumption, and improves carbon-nitrogen ratio by adding carbon source so as to promote anti-nitration reaction, therefore Artificial swamp improves nitric efficiency while can realizing short-cut nitrification and denitrification during sewage is handled.
The present invention compensate for the blank that existing Artificial Wetland Techniques are studied in short-cut nitrification and denitrification denitrogenation, there is provided a kind of The method for simply realizing short-cut nitrification and denitrification in artificial swamp.Using the water flow mode in I ponds and II ponds in artificial swamp Oxygen is realized to be distributed with the gradient of water (flow) direction.Carried by the lime stone that tiled in artificial swamp the upper and lower for short distance nitration Basicity is supplied.Carbon source can be utilized to adjust carbon-nitrogen ratio 4 by microorganisms such as glucose:1~8:1, which enhances artificial swamp denitrification, takes off Nitrogen.
Compared with prior art, beneficial effects of the present invention are：
First, the artificial wet land system and its water flow mode in I ponds and II ponds that the present invention utilizes can be simply real longer The alternate functional layer of multilayer oxygen of existing Aerobic-anaerobic-anoxic-anaerobic-aerobic, meets aerobic ammonia oxidizing bacteria (AOB) and anti-nitre Change the different oxygen environments that bacterium depends on for existence and realize both enrichments, suppress the growth activity of NOB (NOB) So that its quantity is reduced.
Second, the present invention is by adjusting carbon-nitrogen ratio 4 of intaking:1~8:1, be advantageous to provide appropriate carbon source for denitrification, increase Strong denitrifying bacteria effect；Method is simple to operate, and the removal efficiency of artificial swamp total nitrogen is greatly improved.
3rd, using technical scheme, different types of sewage can be directed to, sewage carbon is regulated and controled by additional carbon Nitrogen ratio, short-cut nitrification and denitrification effect is simply and easily realized in artificial swamp, is improved to sewage economical and efficient Purification efficiency, realize NH4 +The clearance that-N clearance reaches 90%~99.6%, TN reaches more than 94%, and organic carbon is gone Except rate reaches 96%~99%.
Brief description of the drawings
Fig. 1 is artificial swamp of the present invention and its lime stone-sand-lime stone grading schematic diagram.
Embodiment
Below in conjunction with the accompanying drawings, the preferably embodiment of the present invention is described in further detail.
Embodiment 1
As shown in figure 1, a kind of device that short-cut nitrification and denitrification method is realized in artificial swamp, including artificial wet land system I ponds 1, II ponds 2, the artificial wet land system also include tank 5 and aeration pump 6, the bottom in the I ponds 1 and the bottom in II ponds 2 It is connected, the top in the II ponds 2 is connected with tank 5, and top of the outlet pipe of the tank 5 through aeration pump 6 and I ponds 1 connects Connect；Lime stone 3 and sand 4 fill system in a manner of the grading of lime stone-sand-lime stone, water inlet pipe 7 are located above I ponds, gone out Water pipe 8 is located above II ponds.In the stone that the lower floor in the I ponds and upper strata are respectively filled in the volume 10% of I ponds 1, average grain diameter is 1mm Lime stone 3；After activated sludge is mixed with the sand 4 less than 10 mesh according to 25%~30% mass ratio, I ponds 1 are filled into Intermediate layer, packing volume are the 70~80% of the volume of I ponds 1, form the artificial swamp of lime stone-sand-lime stone grading mode System；It is filled in II ponds 2 using same method；The I ponds 1 are higher than II ponds 2, and water flows to II ponds 2 by the bottom in I ponds 1； Specially：
(1) as shown in figure 1, making 4 artificial wet land systems using PVB materials, each artificial wet land system is in cylinder, It is made up of two connected units, is divided into I ponds 1 and II ponds 2, highly respectively 60cm and 50cm, barrel bore 20cm, tube wall Thickness is 2mm.Respectively at away from the bottom 25cm of I ponds 1, away from matrix thief hatch is set at the bottom 20cm of II ponds 2, respectively first samples The thief hatch 10 of mouth 9 and second；Aperture is 16mm.Pvc pipe of the two bottom of pond portions using caliber as 36mm is connected.Artificial wet land system is divided into Three layers of upper, middle and lower, wherein, the depth on the upper strata in I ponds and II ponds is 10cm, and the depth of the lower floor in I ponds and II ponds is also 10cm, I pond middle level 30cm are deep, and II ponds middle level 20cm is deep.Levels are respectively filled in the lime stone 3 that main component is calcium carbonate, its Average grain diameter is 1mm, to provide basicity.And middle level matrix is 1.6~2mm sand 4, at the same it is de- by adding in sand 4 The method of nitrogen activated sludge according to 25%~30% mass ratio microbe inoculation.
(2) human configuration sewage；9L running water is measured, thereto addition 0.688g ammonium chlorides, 0.314g potassium dihydrogen phosphates, 0.9g, 1.8g, 2.7g, 3.6g glucose are weighed respectively, form NH4 +- N concentration is 20mg/L, H2PO4 -- P concentration is 8mg/L, is had Machine carbon (OC) concentration is respectively 40mg/L, 80mg/L, 120mg/L, 160mg/L, forms C/N ratios as 2:1、4:1、6:1、8:1 Gradient scope, wherein being respectively 40mg/L using organic carbon (OC) concentration, forming C/N ratios as 2:1 is used as reference examples.
(3) by NH4 +- N concentration is that 20mg/L sewage is placed in internal system one month, promotes matrix to NH4 +- N saturation Absorption, while promote AOB and NOB biofilm, ensure system normal operation.After formal startup optimization, using peristaltic pump to artificial Wetland water inlet carries out circular treatment, and wriggling pump discharge is 12mL/min, is 4.5L according to the effective volume of system, each run 6.42h, while during operation, tank is aerated using aeration pump, its Dissolved Oxygen in Water concentration is reached 9mg/L.Then Peristaltic pump 5.58h out of service, so twice, the hydraulic detention time daily equivalent to 9L sewage is 12h, so for operation daily Circular flow 5 days, i.e. hydraulic detention time are 2.5 days.The surface area of each system is 0.0628m2, volume 0.028m3, then The hydraulic load of sewage is 0.03m3/(m2D), loads of nutrition is 0.57gN/ (m2D), i.e. 1.27gN/ (m3D), it is organic Carbon load is respectively：
C/N ratios are 2:1 organic carbon load is：1.14gC/(m2D), 2.54gC/ (m3·d)；
C/N ratios are 4:1 organic carbon load is：2.28gC/(m2D), 5.08g C/ (m3·d)；
C/N ratios are 6:1 organic carbon load is：3.42gC/(m2D), 7.62gC/ (m3·d)；
C/N ratios are 8:1 organic carbon load is：4.56gC/(m2D), 10.16gC/ (m3·d)。
As can be seen here, every 5 days circulation primaries water inlet, after system continuously runs 30 days, artificial wet land system water inlet C/N is 2 When be only 55% to TN removal efficiency, and more than 94% is reached to TN removal efficiency when C/N is 4,6,8, shows carbon-nitrogen ratio When being less than 8 more than 4, TN clearances are greatly improved.
Bacterial number qPCR the results are shown in Table 1 inside 4 artificial wet land systems.From the data in table 1, AOB and anti-nitre Change the quantity that bacterial number will be more than in other type artificial wet land systems, and its quantity is far above NOB quantity, thus illustrates AOB and denitrifying bacteria are the dominant bacteria in the artificial wet land system and are successfully enriched with；And NOB quantity only accounts for 0~1%, Illustrate that NOB is suppressed, found with reference to water quality interpretation of result, the NO of high concentration is had no in water outlet2 -- N and NO3 -- N, show AOB Caused NO2 -- N is consumed by denitrifying bacteria quickly, i.e., realizes short distance in the artificial wet land system of the present embodiment structure Nitration denitrification.
The AOB of table 1, denitrifying bacteria and NOB bacteria abundance
Remarks:A represents bacteria abundance=average value (copy/g), and P represents institute between AOB, denitrifying bacteria and NOB three Account for percentage.
Embodiment 2
Short-cut nitrification and denitrification is carried out in artificial swamp using the method for embodiment 1, when implementing, adjusts influent quality For：NH4 +- N concentration is 20mg/L, H2PO4 -- P concentration is 8mg/L, is carbon source by adding 1.8g~3.6g glucose, to realize Organic carbon (OC) concentration is 80~160mg/L, so as to adjust carbon-nitrogen ratio between 4~8.
After continuous operation 30 days, the TN of artificial wet land system water inlet removal efficiency reaches more than 94%, to NH4 +- N's Clearance reaches 90%~99.6%, reaches 96%~99% to the clearance of organic carbon.
Comparative example 1
Using Ji, G.D., Wang, R.J., Zhi, W., Liu, X.X., Kong, Y.P., Tan, Y.F., 2012.Distribution patterns of denitrification functional genes and microbial Floras in multimedia constructed wetlands.Ecol.Eng.44,179-188 method carries out Manual moist The nitration denitrification on ground, AOB the and NOB abundance measured in its artificial wet land system is 105~106Between the order of magnitude.
And in embodiment 1, it is 4~6 in C/N ratios:When 1, AOB abundance is 106~107Between the order of magnitude, denitrifying bacteria Abundance 107~108Between the order of magnitude, and NOB minimum number, its abundance is only 103~104Between the order of magnitude.By with Embodiment 1 contrast visible, and the AOB and denitrifying bacteria abundance detected in the present embodiment 1 is far above in comparative example 1 The situation of artificial swamp, and NOB abundance is then far fewer than other artificial swamps.Therefore, in the present embodiment, AOB and denitrification Bacterium is the leader in artificial swamp Approach of Removal of Nitrogen, and the scheme of the present embodiment 1 has more preferable TN removal efficiency.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's Protection domain.

Claims (8)

  1. A kind of 1. method for realizing short-cut nitrification and denitrification in artificial swamp, it is characterised in that：Comprise the following steps：
    Step A：Artificial wet land system with I ponds and II ponds is set, and the artificial wet land system also includes tank and aeration Pump, the bottom in the I ponds are connected with the bottom in II ponds, and the top in the II ponds is connected with tank, the water outlet of the tank Pipe is connected through aeration pump with the top in the I ponds；
    Step B：In the lime stone that the lower floor in the I ponds and upper strata are respectively filled in I pond bodies product 10% ~ 15%, particle diameter is 1 ~ 20mm；Will After activated sludge mixes with the sand less than 10 mesh according to 25% ~ 30% mass ratio, the intermediate layer in I ponds, obturator are filled into Product is the 70 ~ 80% of I pool volumes, forms the artificial wet land system of lime stone-sand-lime stone grading mode；Using same in II ponds The method of sample is filled；The I ponds are higher than II ponds, and water flows to II ponds by the bottom in I ponds；
    Step C：According to system water inlet NH4 +- N concentration, organic concentration of carbon is adjusted by adding carbon source, existed with forming C/N ratios 4:1~8:Influent quality between 1；
    Step D：Tank is aerated, its Dissolved Oxygen in Water concentration is reached more than 9mg/L, intakes in artificial swamp Hydraulic detention time is 2.5 days, is run 15 ~ 30 days so that ammonia oxidizing bacteria and denitrifying bacteria number inside artificial wet land system Amount increases, and NOB is suppressed and quantity is reduced.
  2. 2. the method according to claim 1 for realizing short-cut nitrification and denitrification in artificial swamp, it is characterised in that：In step Before C, first poured with sanitary sewage to artificial wet land system 20 ~ 40 days, to realize matrix to NH4 +- N saturation absorption.
  3. 3. the method according to claim 1 for realizing short-cut nitrification and denitrification in artificial swamp, it is characterised in that：By adding Add glucose to adjust the content of organic carbon.
  4. 4. the method according to claim 3 for realizing short-cut nitrification and denitrification in artificial swamp, it is characterised in that：Regulation has The content of machine carbon, to form C/N as 6:1~8:1 influent quality.
  5. 5. the method according to claim 4 for realizing short-cut nitrification and denitrification in artificial swamp, it is characterised in that：Exist respectively Away from I bottom of pond 20 ~ 30cm of portion, away from II bottom of pond 15 ~ 25cm of portion respectively set matrix thief hatch.
  6. 6. the method according to claim 5 for realizing short-cut nitrification and denitrification in artificial swamp, it is characterised in that：The base The aperture of matter thief hatch is 10 ~ 20mm.
  7. 7. the method for realizing short-cut nitrification and denitrification in artificial swamp according to claim 1 ~ 6 any one, its feature It is：Packed layer in the I ponds is higher than the packed layer at least 10cm in II ponds.
  8. 8. one kind using as described in claim 1 ~ 7 any one artificial swamp realizes the method for short-cut nitrification and denitrification Device, including I ponds, II ponds, tank and aeration pump, the bottom in the I ponds are connected with the bottom in II ponds, the top in the II ponds It is connected with tank, the outlet pipe of the tank is connected through aeration pump with the top in I ponds；Lower floor and upper strata in the I ponds The lime stone that 10% ~ 15% or so, particle diameter is 1 ~ 20mm is accumulated provided with I pond bodies；The intermediate layer in I ponds is filled with activated sludge with being less than 10 Purpose sand is the 70 ~ 80% of I pool volumes according to the mixture after 25% ~ 30% mass ratio mixing, packing volume, forms stone The artificial wet land system of lime stone-sand-lime stone grading mode；It is filled in II ponds using same method；The I ponds are high In II ponds, water flows to II ponds by the bottom in I ponds.
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CN105923929B (en) * 2016-07-05 2019-05-17 西南交通大学 A kind of ecological type artificial rapid infiltration system
CN106554134B (en) * 2016-11-23 2023-04-07 江南大学 Constructed wetland system and application thereof
CN110127953B (en) * 2019-06-05 2020-04-10 北京市水科学技术研究院 Constructed wetland short-cut nitrification/denitrification biological denitrification system and method

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CN201068422Y (en) * 2007-07-06 2008-06-04 北京工业大学 Device for fast realizing short range biological denitrogenation by salinity inhibition combined with fuzzy control
CN102173533A (en) * 2011-02-28 2011-09-07 桂林理工大学 Efficient anaerobic ammonium oxidation sewage treatment method
CN103253771A (en) * 2013-04-27 2013-08-21 杭州师范大学 Water body denitrification reinforcement restoring device of artificial wetland

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CN102173533A (en) * 2011-02-28 2011-09-07 桂林理工大学 Efficient anaerobic ammonium oxidation sewage treatment method
CN103253771A (en) * 2013-04-27 2013-08-21 杭州师范大学 Water body denitrification reinforcement restoring device of artificial wetland

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