CN103936173B - Autotrophic denitrifying nitrogen-removal reaction device, denitrification system and denitrification method of denitrification system - Google Patents
Autotrophic denitrifying nitrogen-removal reaction device, denitrification system and denitrification method of denitrification system Download PDFInfo
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Abstract
The invention discloses an autotrophic denitrifying nitrogen-removal reaction device. The autotrophic denitrifying nitrogen-removal reaction device comprises a housing, and an oxygen limited nitrosoation reaction region, a heterotrophic denitrification gas-producing region and an upflow autotrophic denitrification region all arranged in the housing; a liquid inlet and a liquid outlet are formed in the housing, and the liquid inlet is communicated with the oxygen limited nitrosoation reaction region; the liquid outlet is communicated with the upflow autotrophic denitrification region; the oxygen limited nitrosoation reaction region is arranged in the central region of the upper half part of the housing; the heterotrophic denitrification gas-producing region is arranged in a region under the oxygen limited nitrosoation reaction region and communicated with the oxygen limited nitrosoation reaction region; the upflow autotrophic denitrification region surrounds the oxygen limited nitrosoation reaction region and the bottom of the upflow autotrophic denitrification region is communicated with the heterotrophic denitrification gas-producing region. The invention also discloses a denitrification system and a denitrification method thereof. The autotrophic denitrifying nitrogen-removal reaction device, the denitrification system and the denitrification method of the denitrification system have the characteristics of high efficiency, large load and convenient operation, and also are low in operation cost, free of addition of lots of extra carbon source and prone to realize automatic control, and thus have practical application value for up-to-standard treatment and efficient low-consumption operation of high-nitrogen low-carbon wastewater.
Description
Technical field
The invention belongs to waste disposal plant and use field thereof, particularly relate to a kind of autotrophic denitrification denitrogenation reactor, denitrification system and denitrogenation method thereof.
Background technology
Traditional biological denitrogenation theory proposes: the organonitrogen in sewage is NH by heterotroph microbial transformation
4 +-N, is then translated into nitric nitrogen NO by Autotrophic nitrification bacterium
2 --N and NO
3 --N, nitric nitrogen under anoxic conditions, is reduced through denitrifying bacterium effect and is converted into nitrogen, reach the object of sewage water denitrification.Enough carbon sources are that denitrification process carries out smoothly and then realizes the key of efficient denitrification.When the carbon-nitrogen ratio (C/N ratio) in waste water lower than 3.4 time, outer carbon source need be added ensure and reach good Nitrogen removal effect.The process of low-carbon high-nitrogen sewage as mud lye, percolate, gourmet powder waste water, breeding wastewater, coking chemical waste water etc. all belongs to this type of, as adopted traditional nitration denitrification process to need additional carbon, increases processing cost.
In view of country is to the raising of total nitrogen emission request in sewage, traditional denitrification treatment technology faces a severe challenge, in the urgent need to new efficient low-consume denitride technology.
Summary of the invention
Instant invention overcomes needed for prior art medium high carbon nitrogen that carbon source amount is high, processing cost is expensive, and the defects such as desirable Nitrogen removal effect cannot be issued at low ratio of carbon to ammonium environment, propose a kind of autotrophic denitrification denitrogenation reactor, denitrification system and denitrogenation method thereof.
The present invention proposes a kind of autotrophic denitrification denitrogenation reactor, comprise housing, and Xian Yang nitrosation reaction district in described housing, heterotrophic denitrification gas-producing area and up-flow autotrophic denitrification district; Described housing is provided with a fluid inlet and at least one liquid outlet, and described fluid inlet is communicated with, for providing high ammonia-nitrogen wastewater with described Xian Yang nitrosation reaction district; Described liquid outlet is communicated with described up-flow autotrophic denitrification district, for discharging the waste water after denitrogenation; Described Xian Yang nitrosation reaction district is arranged on the middle section of described casing upper half; Described heterotrophic denitrification gas-producing area is arranged on the lower zone in described Xian Yang nitrosation reaction district, and is communicated with described Xian Yang nitrosation reaction district; Described up-flow autotrophic denitrification district is looped around the surrounding in described Xian Yang nitrosation reaction district, and by guiding device and described limit oxygen nitrosation reaction distinguish every; The bottom in described up-flow autotrophic denitrification district is communicated with described heterotrophic denitrification gas-producing area.
In the autotrophic denitrification denitrogenation reactor that the present invention proposes, be provided with floating stuffing in described Xian Yang nitrosation reaction district, the density of described floating stuffing is less than or equal to 1g/cm
3.
In the autotrophic denitrification denitrogenation reactor that the present invention proposes, the shape of described guiding device is the middle cylindrical, hollow pipeline inwardly shunk.
In the autotrophic denitrification denitrogenation reactor that the present invention proposes, the bottom of described heterotrophic denitrification gas-producing area is provided with whipping appts, and described whipping appts is in order to stir high ammonia-nitrogen wastewater and to be sent into by high ammonia-nitrogen wastewater in described up-flow autotrophic denitrification district.
In the autotrophic denitrification denitrogenation reactor that the present invention proposes, the height of described liquid outlet is lower than described fluid inlet 0.1-0.15 rice.
The invention allows for a kind of autotrophic denitrification denitrification system, comprising: described autotrophic denitrification denitrogenation reactor; Waste water transfer mechanism, it is communicated with described fluid inlet, for carrying high ammonia-nitrogen wastewater in described autotrophic denitrification denitrogenation reactor; Gas supply mechanism, it is communicated with described Xian Yang nitrosation reaction district, for the oxygen supply of described autotrophic denitrification denitrogenation reactor; Carbon source transfer mechanism, it is communicated with described heterotrophic denitrification gas-producing area, for providing carbon source in described heterotrophic denitrification gas-producing area.
In the autotrophic denitrification denitrification system that the present invention proposes, described waste water transfer mechanism comprises high ammonia-nitrogen wastewater storage tank and peristaltic pump;
Described high ammonia-nitrogen wastewater storage tank is communicated with described fluid inlet with described peristaltic pump by pipeline, carries described high ammonia-nitrogen wastewater by described peristaltic pump in described Xian Yang nitrosation reaction district.
In the autotrophic denitrification denitrification system that the present invention proposes, described gas supply mechanism comprises blower fan and aerating apparatus;
Described aerating apparatus is arranged in described Xian Yang nitrosation reaction district, and described blower and pipeline, to described aerating apparatus supply gas, realizes micro-aeration by described aerating apparatus in described Xian Yang nitrosation reaction district.
In the autotrophic denitrification denitrification system that the present invention proposes, described carbon source transfer mechanism comprises outer carbon source storage tank, peristaltic pump and water distributor; Described water distributor is arranged on the bottom of described heterotrophic denitrification gas-producing area, and described outer carbon source storage tank to described water distributor conveying carbon source, provides carbon source by described water distributor by peristaltic pump in described heterotrophic denitrification gas-producing area.
The invention allows for a kind of autotrophic denitrification denitrogenation method of autotrophic denitrification denitrification system, comprise the steps:
Step one: inoculate autotrophic denitrification bacterium in described autotrophic denitrification denitrogenation reactor, and put into floating stuffing;
Step 2: described waste water transfer mechanism carries high ammonia-nitrogen wastewater by fluid inlet to described Xian Yang nitrosation reaction district;
Step 3: described gas supply mechanism is to micro-aeration in described Xian Yang nitrosation reaction district, when there is NOx gas, there is limit oxygen nitrosation reaction by described autotrophic denitrification bacterium and generate nitrite in the nitrogen ammonia contained by described high ammonia-nitrogen wastewater, generates nitrogen simultaneously and realize denitrogenation;
Step 4: described carbon source transfer mechanism provides carbon source to described heterotrophic denitrification gas-producing area, described high ammonia-nitrogen wastewater sinks down in described heterotrophic denitrification gas-producing area, nitrite and carbon source generation heterotrophic denitrification react, generate NOx gas and collected by guiding device and enter in described Xian Yang nitrosation reaction district, high ammonia-nitrogen wastewater is sent in described up-flow autotrophic denitrification district by whipping appts;
Step 5: in described up-flow autotrophic denitrification district, deposit in case at described NOx gas, described autotrophic denitrification bacterium and described high ammonia-nitrogen wastewater generation autotrophic denitrification react, and produce nitrogen and realize denitrogenation;
Step 6: the waste water after denitrogenation processing is got rid of from liquid outlet.
In the autotrophic denitrification denitrogenation method of the autotrophic denitrification denitrification system that the present invention proposes, the temperature that described high ammonia-nitrogen wastewater carries out denitrogenation processing is 26 ~ 30 degrees Celsius.
In the autotrophic denitrification denitrogenation method of the autotrophic denitrification denitrification system that the present invention proposes, the carbon-nitrogen ratio in described heterotrophic denitrification gas-producing area is not higher than 0.1.
Autotrophic denitrification denitrogenation reactor of the present invention adopts integrated design, complete in reaction unit while of realizing nitrosation reaction and anti-nitration reaction, and efficient denitrogenation processing can be carried out under the environment of low ratio of carbon to ammonium, required additional carbon source amount significantly reduces, and nitrogen removal rate is up to more than 95%.
It is convenient that autotrophic denitrification denitrification system of the present invention operation runs, can the denitrification rates of Real-Time Monitoring high ammonia-nitrogen wastewater, easily is automated control.
Autotrophic denitrification denitrogenation method of the present invention adopts biological denitrification method to have for the process of high ammonia nitrogen low organic carbon waste water the advantage that efficiency is high, cost is low, do not have secondary pollution, do not need additional a large amount of carbon source.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of autotrophic denitrification denitrogenation reactor of the present invention;
Fig. 2 is the vertical view of autotrophic denitrification denitrogenation reactor of the present invention;
Fig. 3 is the schematic diagram of autotrophic denitrification denitrification system of the present invention;
Fig. 4 is the graphic representation of autotrophic denitrification denitrogenation reactor nitrogen removal rate of the present invention and ammonia nitrogen volumetric loading;
Fig. 5 is the schema of autotrophic denitrification denitrogenation method of the present invention.
Embodiment
In conjunction with following specific embodiments and the drawings, the present invention is described in further detail.Implement process of the present invention, condition, experimental technique etc., except the following content mentioned specially, be universal knowledege and the common practise of this area, the present invention is not particularly limited content.
Autotrophic denitrification denitrogenation reactor in the present invention as shown in Figure 1, comprises a housing, has space in housing, and the oxygen nitrosation reaction district that is limited, heterotrophic denitrification gas-producing area and up-flow autotrophic denitrification district are divided in space.
Housing is provided with a fluid inlet and several liquid outlets, and fluid inlet is communicated with Xian Yang nitrosation reaction district, for feeding high ammonia-nitrogen wastewater; Liquid outlet is communicated with up-flow autotrophic denitrification district, for discharging the waste water after denitrogenation.The height of liquid outlet lower than fluid inlet 0.1-0.15 rice, thus forms waste water flows to water outlet natural flow from water-in.
Xian Yang nitrosation reaction district is arranged on the central authorities of casing upper half.Xian Yang nitrosation reaction is provided with floating stuffing in district, and the density of floating stuffing is less than or equal to 1g/cm
3.
Heterotrophic denitrification gas-producing area is arranged on the below in Xian Yang nitrosation reaction district, and it is communicated with Xian Yang nitrosation reaction district.
Up-flow autotrophic denitrification district around the surrounding in Xian Yang nitrosation reaction district, and by guiding device 6 and limit oxygen nitrosation reaction distinguishes from, the shape of guiding device 6 is the cylindrical, hollow pipeline of middle inwardly contraction.The bottom in up-flow autotrophic denitrification district is communicated with heterotrophic denitrification gas-producing area, and the bottom of heterotrophic denitrification gas-producing area is provided with whipping appts 9, and whipping appts is in order to stir high ammonia-nitrogen wastewater and to be sent into by high ammonia-nitrogen wastewater in up-flow autotrophic denitrification district.
Guiding device 6 as shown in Figures 1 and 2, its structure is the middle cylindrical, hollow pipeline inwardly shunk, major part NOx gas can import in Xian Yang nitrosation reaction district by diversed device 6, and residual NOx gas can enter up-flow autotrophic denitrification district with waste water and carry out denitrification denitrogenation.
Fig. 3 display be autotrophic denitrification denitrification system in the present invention, comprise autotrophic denitrification denitrogenation reactor, waste water transfer mechanism, gas supply mechanism and carbon source transfer mechanism.
Waste water transfer mechanism comprises high ammonia-nitrogen wastewater storage tank 101 and peristaltic pump 3; High ammonia-nitrogen wastewater storage tank 101 is communicated with fluid inlet with peristaltic pump 3 by pipeline, carries high ammonia-nitrogen wastewater by peristaltic pump 3 in Xian Yang nitrosation reaction district.
Gas supply mechanism is to autotrophic denitrification denitrogenation reactor supply gas.Gas supply mechanism comprises blower fan 5 and aerating apparatus 7; Aerating apparatus 7 is arranged in Xian Yang nitrosation reaction district, and blower fan 5 to aerating apparatus 7 supply gas, realizes micro-aeration by aerating apparatus 7 in Xian Yang nitrosation reaction district by pipeline.
Carbon source transfer mechanism comprises outer carbon source storage tank 102, peristaltic pump 3 and water distributor 8; Water distributor 8 is arranged on the bottom of heterotrophic denitrification gas-producing area, and outer carbon source storage tank 102 carries carbon source by peristaltic pump 3 to water distributor 8, provides carbon source by water distributor 8 in heterotrophic denitrification gas-producing area.
High ammonia-nitrogen wastewater is sent in Xian Yang nitrosation reaction district by water-in.Xian Yang nitrosation reaction adds autotrophic denitrification bacterium in district, and for autotrophic denitrification bacterium arranges floating stuffing 10 in Xian Yang nitrosation reaction district, the density of floating stuffing 10 is less than or equal to 1g/cm
3.
Be more than the primary structure of the autotrophic denitrification denitrification system in the present invention, the principle for this autotrophic denitrification denitrification system does following explanation:
Waste water transfer mechanism carries high ammonia-nitrogen wastewater by fluid inlet to Xian Yang nitrosation reaction district.
In Xian Yang nitrosation reaction district, when there is NOx gas, the nitrogen ammonia in high ammonia-nitrogen wastewater utilizes NOx gas that limit oxygen nitrosation reaction generation nitrite and nitrogen occur by adding autotrophic denitrification bacterium, and its principle is: 3NH
4 ++ 3O
2→ N
2+ NO
2 -+ 4H
++ 4H
2o.The nitrogen content of the nitrogen discharge generated to external environment thus in reduction waste water, thus denitrogenation processing is carried out to high ammonia-nitrogen wastewater.
In heterotrophic denitrification gas-producing area, the carbon source provided by carbon source transfer mechanism provides electron donor for waste water, in Xian Yang nitrosation reaction district, generate nitrite sink with high ammonia-nitrogen wastewater, after heterotrophic denitrification reacts, NOx gas is produced in heterotrophic denitrification gas-producing area and carbon source, the diversed device 6 of part NOx gas is collected and is transported in the Xian Yang nitrosation reaction district of top, the reaction of the autotrophic denitrification bacterium be limited in oxygen nitrosation reaction district provides NOx gas, ensure to carry out denitrogenation processing smoothly in Xian Yang nitrosation reaction district, due to the nitrogen of in high ammonia-nitrogen wastewater 70% can be deviate from Xian Yang nitrosation reaction district, therefore the reaction producing NOx gas in heterotrophic denitrification gas-producing area is even more important.
High ammonia-nitrogen wastewater is sent in up-flow autotrophic denitrification district by whipping appts 9 after above-mentioned denitrogenation.In up-flow autotrophic denitrification district, high ammonia-nitrogen wastewater does up-flow motion to liquid outlet.In up-flow moving process, autotrophic denitrification bacterium contained in waste water utilizes NOx gas generation autotrophic denitrification to react and generates nitrogen, and its principle is: NO
2 -+ H
++ 3 [H] → 0.5N
2+ 2H
2o.The nitrogen generated is disposed in external environment by liquid outlet, and the waste water after denitrogenation simultaneously flows out from liquid outlet, completes and carries out denitrogenation processing to high ammonia-nitrogen wastewater.
As shown in Figure 5, the operation steps of autotrophic denitrification denitrogenation method of the present invention is as follows:
Step one: inoculate autotrophic denitrification bacterium in autotrophic denitrification denitrogenation reactor, and put into floating stuffing;
Step 2: waste water transfer mechanism carries high ammonia-nitrogen wastewater by fluid inlet to Xian Yang nitrosation reaction district;
Step 3: gas supply mechanism is to micro-aeration in Xian Yang nitrosation reaction district, and when there is NOx gas, the nitrogen ammonia contained by high ammonia-nitrogen wastewater by autotrophic denitrification bacterium, limit oxygen nitrosation reaction occurs and generates nitrite, generates nitrogen simultaneously and realizes denitrogenation;
Step 4: carbon source transfer mechanism provides carbon source to heterotrophic denitrification gas-producing area, high ammonia-nitrogen wastewater sinks down in heterotrophic denitrification gas-producing area, nitrite and carbon source generation heterotrophic denitrification react, generate NOx gas and collected by guiding device and enter in Xian Yang nitrosation reaction district, high ammonia-nitrogen wastewater is sent in up-flow autotrophic denitrification district by whipping appts; Carbon-nitrogen ratio in heterotrophic denitrification gas-producing area is not higher than 0.1.
Step 5: in up-flow autotrophic denitrification district, deposit in case at NOx gas, autotrophic denitrification bacterium and high ammonia-nitrogen wastewater generation autotrophic denitrification react, and produce nitrogen and realize denitrogenation;
Step 6: the waste water after denitrogenation processing is got rid of from liquid outlet.
The envrionment temperature that in said process, reactor runs controls at 26 ~ 30 DEG C, and keeps reactor lucifuge state, keeps the carbon source amount be evenly distributed into meet C/N=0.03.During the micro-aeration in top, dissolved oxygen controls as about 1mg/L.Fig. 4 shows the relation of autotrophic denitrification denitrogenation reactor nitrogen removal rate and ammonia nitrogen volumetric loading, when the influent ammonia nitrogen volumetric loading of waste water transfer mechanism controls at 80g/m
3﹒ d, when hydraulic detention time is about 70h, wherein the nitrosation reaction district residence time is about 35h, and traditional nitration denitrification region residence time is about 14h, and the up-flow autotrophic denitrification region residence time is about 21h, and nitrogen removal rate can be made to be up to 80%.
Flow by arranging under meter 2 or gas meter 4 pairs of high ammonia-nitrogen wastewaters, air and additional carbons on pipeline in the invention process process carries out Real-Time Monitoring, and controls the flow of supply by automatic routine, realizes full-automatic biological denitrificaion.
Protection content of the present invention is not limited to above embodiment.Under the spirit and scope not deviating from inventive concept, the change that those skilled in the art can expect and advantage are all included in the present invention, and are protection domain with appending claims.
Claims (12)
1. an autotrophic denitrification denitrogenation reactor, is characterized in that, comprises housing, and Xian Yang nitrosation reaction district in described housing, heterotrophic denitrification gas-producing area and up-flow autotrophic denitrification district;
Described housing is provided with a fluid inlet and at least one liquid outlet, and described fluid inlet is communicated with, for providing high ammonia-nitrogen wastewater with described Xian Yang nitrosation reaction district; Described liquid outlet is communicated with described up-flow autotrophic denitrification district, for discharging the waste water after denitrogenation;
Described Xian Yang nitrosation reaction district is arranged on the middle section of described casing upper half;
Described heterotrophic denitrification gas-producing area is arranged on the lower zone in described Xian Yang nitrosation reaction district, and is communicated with described Xian Yang nitrosation reaction district;
Described up-flow autotrophic denitrification district is looped around the surrounding in described Xian Yang nitrosation reaction district, and by guiding device and described limit oxygen nitrosation reaction distinguish every; The bottom in described up-flow autotrophic denitrification district is communicated with described heterotrophic denitrification gas-producing area.
2. autotrophic denitrification denitrogenation reactor as claimed in claim 1, it is characterized in that, be provided with floating stuffing in described Xian Yang nitrosation reaction district, the density of described floating stuffing is less than or equal to 1g/cm
3.
3. autotrophic denitrification denitrogenation reactor as claimed in claim 1, is characterized in that, the shape of described guiding device is the middle cylindrical, hollow pipeline inwardly shunk.
4. autotrophic denitrification denitrogenation reactor as claimed in claim 1, it is characterized in that, the bottom of described heterotrophic denitrification gas-producing area is provided with whipping appts, and described whipping appts is in order to stir high ammonia-nitrogen wastewater and to be sent into by high ammonia-nitrogen wastewater in described up-flow autotrophic denitrification district.
5. autotrophic denitrification denitrogenation reactor as claimed in claim 1, it is characterized in that, the height of described liquid outlet is lower than described fluid inlet 0.1-0.15 rice.
6. an autotrophic denitrification denitrification system, is characterized in that, comprising:
Autotrophic denitrification denitrogenation reactor described in any one of claim 1-5;
Waste water transfer mechanism, it is communicated with described fluid inlet, for carrying high ammonia-nitrogen wastewater in described autotrophic denitrification denitrogenation reactor;
Gas supply mechanism, it is communicated with described Xian Yang nitrosation reaction district, for the oxygen supply of described autotrophic denitrification denitrogenation reactor;
Carbon source transfer mechanism, it is communicated with described heterotrophic denitrification gas-producing area, for providing carbon source in described heterotrophic denitrification gas-producing area.
7. autotrophic denitrification denitrification system as claimed in claim 6, it is characterized in that, described waste water transfer mechanism comprises high ammonia-nitrogen wastewater storage tank and peristaltic pump;
Described high ammonia-nitrogen wastewater storage tank is communicated with described fluid inlet with described peristaltic pump by pipeline, carries described high ammonia-nitrogen wastewater by described peristaltic pump in described Xian Yang nitrosation reaction district.
8. autotrophic denitrification denitrification system as claimed in claim 6, it is characterized in that, described gas supply mechanism comprises blower fan and aerating apparatus;
Described aerating apparatus is arranged in described Xian Yang nitrosation reaction district, and described blower and pipeline, to described aerating apparatus supply gas, realizes micro-aeration by described aerating apparatus in described Xian Yang nitrosation reaction district.
9. autotrophic denitrification denitrification system as claimed in claim 6, it is characterized in that, described carbon source transfer mechanism comprises outer carbon source storage tank, peristaltic pump and water distributor; Described water distributor is arranged on the bottom of described heterotrophic denitrification gas-producing area, and described outer carbon source storage tank to described water distributor conveying carbon source, provides carbon source by described water distributor by peristaltic pump in described heterotrophic denitrification gas-producing area.
10. described in any one of claim 6 to 9, an autotrophic denitrification denitrogenation method for autotrophic denitrification denitrification system, is characterized in that, comprise the steps:
Step one: inoculate autotrophic denitrification bacterium in described autotrophic denitrification denitrogenation reactor, and put into floating stuffing;
Step 2: described waste water transfer mechanism carries high ammonia-nitrogen wastewater by fluid inlet to described Xian Yang nitrosation reaction district;
Step 3: described gas supply mechanism is to micro-aeration in described Xian Yang nitrosation reaction district, when there is NOx gas, there is limit oxygen nitrosation reaction by described autotrophic denitrification bacterium and generate nitrite in the nitrogen ammonia contained by described high ammonia-nitrogen wastewater, generates nitrogen simultaneously and realize denitrogenation;
Step 4: described carbon source transfer mechanism provides carbon source to described heterotrophic denitrification gas-producing area, described high ammonia-nitrogen wastewater sinks down in described heterotrophic denitrification gas-producing area, nitrite and carbon source generation heterotrophic denitrification react, generate NOx gas and collected by guiding device and enter in described Xian Yang nitrosation reaction district, high ammonia-nitrogen wastewater is sent in described up-flow autotrophic denitrification district by whipping appts;
Step 5: in described up-flow autotrophic denitrification district, deposit in case at described NOx gas, described autotrophic denitrification bacterium and described high ammonia-nitrogen wastewater generation autotrophic denitrification react, and produce nitrogen and realize denitrogenation;
Step 6: the waste water after denitrogenation processing is got rid of from liquid outlet.
The autotrophic denitrification denitrogenation method of 11. autotrophic denitrification denitrification systems as claimed in claim 10, is characterized in that, the temperature that described high ammonia-nitrogen wastewater carries out denitrogenation processing is 26 ~ 30 degrees Celsius.
The autotrophic denitrification denitrogenation method of 12. autotrophic denitrification denitrification systems as claimed in claim 10, it is characterized in that, the carbon-nitrogen ratio in described heterotrophic denitrification gas-producing area is not higher than 0.1.
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| CN102689986A (en) * | 2012-06-18 | 2012-09-26 | 华东理工大学 | Sewage treatment method capable of realizing advanced nitrogen removal through combined biofilm process |
| CN103601293A (en) * | 2013-10-10 | 2014-02-26 | 杭州师范大学 | Tower-type bioreactor synchronously removing carbon, nitrogen and sulfur |
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| JP3925902B2 (en) * | 2001-11-22 | 2007-06-06 | 株式会社荏原製作所 | Biological nitrogen removal method and apparatus |
| JP4572504B2 (en) * | 2003-03-24 | 2010-11-04 | 栗田工業株式会社 | Biological denitrification method |
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| CN103601293A (en) * | 2013-10-10 | 2014-02-26 | 杭州师范大学 | Tower-type bioreactor synchronously removing carbon, nitrogen and sulfur |
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