CN105645665B - A kind of processing method of organic wastewater with difficult degradation thereby - Google Patents

A kind of processing method of organic wastewater with difficult degradation thereby Download PDF

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CN105645665B
CN105645665B CN201410731125.1A CN201410731125A CN105645665B CN 105645665 B CN105645665 B CN 105645665B CN 201410731125 A CN201410731125 A CN 201410731125A CN 105645665 B CN105645665 B CN 105645665B
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cgmcc
culture
dissolved oxygen
denitrogenation
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CN105645665A (en
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高会杰
郭志华
孙丹凤
李宝忠
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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China Petroleum and Chemical Corp
Sinopec Fushun Research Institute of Petroleum and Petrochemicals
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Abstract

The invention discloses a kind of processing methods of organic wastewater with difficult degradation thereby, it mainly include anoxic unit, aerobic unit and denitrogenation unit, nitrosation dominant bacteria is added in aerobic unit, nitrosoation rate is 65% ~ 80% in control nitrified effluent, wherein aerobic unit is discharged a part and is back to anoxic unit, reflux ratio is controlled 25% ~ 50%, another part enters denitrogenation unit, discharges after denitrogenation cell processing.The present invention plays the synergistic effect between flora by controlling ratio and the mixed liquid recycle ratio of nitration product, and then realizes the dual processing up to standard of COD and total nitrogen in waste water.The method of the present invention has the characteristics that process is short, land occupation saves, reflux ratio is low, treatment effeciency is high.

Description

A kind of processing method of organic wastewater with difficult degradation thereby
Technical field
The invention belongs to technical field of waste water processing, and in particular to a kind of processing method of organic wastewater with difficult degradation thereby.
Background technique
With the rapid development of the industries such as petrochemical industry, plastics, synthetic fibers, printing and dyeing, coal chemical industry, especially new technology, New material continues on, and persistent organic pollutants type gradually increases in the waste water for generating these enterprises, the place of waste water Difficulty is managed to increase.Although the physico-chemical process such as advanced oxidation can handle organic wastewater with difficult degradation thereby, but because there are it is at high cost, Mineralising is incomplete, is also easy to produce the deficiencies of secondary pollution, therefore is usually used in the pretreatment of biological treatment, to improve biodegradability.Biology Processing is because investment is small, processing cost is low, mineralising is complete, and the terminal technology as wastewater treatment, in organic wastewater with difficult degradation thereby Treatment process in it is of increasing concern.
Pollutant in organic wastewater with difficult degradation thereby mainly includes hydro carbons, phenols, Ppolynuclear aromatic, nitro compound, nitrogenous Heterocyclic compound etc. especially cannot quickly be identified by microorganism mostly by artificial synthesized certain organic matters and have to microorganism Inhibiting effect cannot be decomposed by the microorganisms utilization in a short time, therefore traditional bioremediation is carried out certainly with activated sludge So culture acclimated microorganism cannot be removed effectively the pollutant in waste water.
Wu Yucheng etc. (benzene and toluene under Denitrification Conditions in microbial degradation underground water, China Environmental Science, 1999 (06)) carry out the research of benzene in microbial degradation underground water under Denitrification Conditions, find micro- life under the conditions of intensified anti-nitrated Object can be using nitrate as electron acceptor degradation benzene.(several nitrogen-containing heterocycle compound anoxics drop Li Yongmei etc. in coking wastewater Solve mechanism, Tongji University's journal, 2001 (06)) it anoxic denitrification has been carried out to nitrogen-containing heterocycle compounds several in coking wastewater has ground Study carefully.Shen marine rainbow etc. (anoxic denitrification removes heterocycles, pyridines research difficult to degrade, Shanghai environmental science (11)) utilizes anoxic Denitrification studies heterocycles, pyridines, has all affirmed the effect of anoxic denitrification removal hardly degraded organic substance.Cause This, under anoxia condition to it is toxic or compared in organic wastewater with difficult degradation thereby be added nitrate as electron acceptor remove Organic substance in water be A kind of new sewage treatment means.Anaerobic hydrolysis-acidification process has some superiority to organic wastewater with difficult degradation thereby processing, but still So there are biological transformation ratios low, anaerobic hydrolysis-acidification microbe concentration tolerance degree is limited and hydrolysis acidification system The problems such as there are Accumulation of Organic Acids.As traditional activated sludge process processing technological flow is long, takes up a large area, lance complicated for operation Shield becomes increasingly conspicuous, and is attempted to improve organic wastewater with difficult degradation thereby by improving with optimization metabolism strain improvement and reaction process Degradation efficiency.
CN201010218533.9 discloses a kind of composite and highly effective microorganism preparation and system for refractory wastewater Standby and application, the invention solve the processing problem of organic wastewater with difficult degradation thereby by adding microbial inoculum, but do not carry out to technique Optimization, the residence time of wastewater treatment are still up to 60 hours or more.It is organic that CN200710090244.3 discloses a kind of high concentration Waste water advanced denitrifying method, this method include that the anaerobism being sequentially connected togather removes carbon area, aerobic nitrosated area adds anaerobism Ammoxidation denitrogenation area and traditional nitration denitrification district's groups at, need to be made of six independent reaction tanks, treatment process is longer, and It is not directed to the treatment effect of the waste water containing hardly degraded organic substance.CN201110007336.7 discloses a kind of processing dry method nitrile The double back flow denitrification MBR technique of synthetic fibre waste water, mainly by tetra- preposition anoxic pond, nitrification tank, postposition anoxic pond and MBR major functions Unit composition realizes the removal of organic matter and ammonia nitrogen by the double back streaming system of setting nitrification liquid and sludge condensation liquid.The invention Compared with common forward type " anaerobic-aerobic " type MBR reactor of reflux ratio 200% ~ 400%, aerobic tank mixed liquid recycle ratio is 150%, reduce 38% ~ 45% operating cost, total hrt 30 hours, COD removal rate are discharged COD up to 70% ~ 80% Concentration is 190 ~ 360mg/L, and the COD in water outlet also needs to be further processed to can be only achieved discharge standard.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of processing methods of organic wastewater with difficult degradation thereby.The present invention is logical Ratio and the mixed liquid recycle ratio of control nitration product are crossed to play the synergistic effect between flora, and then realizes COD in waste water With the dual processing up to standard of total nitrogen.The method of the present invention has the characteristics that process is short, land occupation saves, reflux ratio is low, treatment effeciency is high.
The processing method of organic wastewater with difficult degradation thereby of the present invention, including anoxic unit, aerobic unit and denitrogenation unit, aerobic Unit adds nitrosation dominant bacteria, and controlling nitrosoation rate in nitrified effluent, 65% ~ 80%, wherein aerobic unit water outlet is a part of returns It is flow to anoxic unit, controls reflux ratio 25% ~ 50%, another part enters denitrogenation unit, discharges after denitrogenation cell processing.
The operating condition of anoxic unit of the present invention is that pH is 7.5 ~ 8.5, DO < 0.2mg/L, and temperature is 30 ~ 40 DEG C.
Aerobic unit of the present invention needs to control nitrosoation rate between 65% ~ 80%, just can guarantee that aerobic unit goes out Water, which is back to anoxic zone, has facilitation to toxic and hard-degraded substance removal, and can be improved degradation rate.The present invention is good The nitrosation dominant bacteria of oxygen unit only needs to add when starting period and unit water outlet nitrosoation rate are lower than 65%, nitrosation advantage The acquisition of bacterium be it is well-known to those skilled in the art, preferably add CN201010221166.8 the method acquisition dominant bacteria Group, the acquisition of nitrosation dominant bacteria includes following three cultivation stages: first stage: the mixing of enrichment Nitrosomas and Nitromonas Flora obtains ammonia nitrogen removal frank up to 90% or more nitrifying bacteria community;Second stage: using high-temperature cultivation replace with room temperature culture into Capable method carries out Nitromonas elutriation, the superiority of Nitrosomas is gradually increased, high-temperature cultivation replaces training with room temperature culture The method of supporting carries out 2~6 times, until nitrosoation rate is transferred to phase III culture when being greater than 50%;Phase III: change dissolved oxygen and pH Condition carries out the further of Nitromonas and eluriates and the stability of Nitrosomas is tamed, until nitrosoation rate is stablized 65% or more, knot The culture of beam a cycle obtains the flora of nitrococcus dominance, and it is spare then to carry out preservation;Wherein second stage room temperature is trained The condition of supporting are as follows: temperature is 15~30 DEG C, 0.1~3mg/L of dissolved oxygen, pH value 6~9, and incubation time is 5~30 days;Second stage The condition of high-temperature cultivation are as follows: temperature is 2~20 DEG C higher than room temperature cultivation temperature, 0.1~3mg/L of dissolved oxygen, pH value 6~9, when culture Between be 5~30 days;Change dissolved oxygen and pH condition described in phase III refer to every suitable time change dissolved oxygen concentration and PH value control range, for total Dissolved Oxygen concentration Control in 0.1~3mg/L, total pH control range is 7.5~9.0;Phase III In incubation every 8~change dissolved oxygen and pH condition for 24 hours, the culture in such a way that dissolved oxygen content and pH step up, or Person is cultivated by random alternation condition.Aerobic unit control DO of the present invention is in 0.5 ~ 2.5mg/L, and pH value is 8.2 ~ 8.5, temperature It is 30 ~ 35 DEG C.
Aerobic unit of the present invention is discharged a part and is back to anoxic unit, and reflux ratio is controlled 25% ~ 50%, gone into operation Startup stage takes the mode that reflux ratio is gradually increased.Specific reflux ratio is needed according to COD:(NO2 --N+NO3 -- N) ratio It determines, works as COD:(NO2 --N+NO3 -- N) ratio less than 25 when need to reduce reflux ratio, work as COD:(NO2 --N+NO3 --N) Ratio when being greater than 50, need to increase reflux ratio, the amplitude for reducing and increasing reflux ratio is no more than 20%.
The present invention adds microbial bacterial agent in denitrogenation unit, preferably add CN201210130645.8 or Microbial bacterial agent described in CN201210130644.3, dosage are the 0.5% ~ 1.0% of handled wastewater volume per hour.It is more excellent Choosing add simultaneously containing Methylobacterium (Methylobacterium phyllosphaerae) SDN-3, Paracoccus denitrificans (Paracoccus denitrificans) DN-3, arthrobacterium (Arthrobacter creatinolyticus) FDN-1, water Family name's Flavobacterium (Flavobacterium mizutaii) FDN-2, marsh cock Salmonella (Kocuria palustris) FSDN-A With Staphylococcus cohnis (Staphylococcus cohnii) six kinds of bacterial strains of FSDN-C microbial inoculum, the thallus volume ratio of six kinds of bacterium It is 1:1:1 ~ 5:1 ~ 5:1 ~ 10:1 ~ 3(based on thallus volume, thallus volume is that the bacterium solution containing culture solution is centrifuged under the conditions of 10,000 turns The thallus volume that separation 5min is obtained, similarly hereinafter), six kinds of bacterial strains are preserved in respectively on March 11st, 2010 and on July 14th, 2011 " China Committee for Culture Collection of Microorganisms's common micro-organisms center ", deposit number be respectively CGMCC No.3660, CGMCC No.3658, CGMCC No.3657, CGMCC No.3659, CGMCC NO.5061 and CGMCC NO.5062, dosage It is the 0.1% ~ 0.5% of handled wastewater volume per hour.Denitrogenation unit is needed before microbial inoculum adds according to sludge concentration (MLSS) Denitrifying activated sludge is added for 1000 ~ 2000mg/L.
Compared with prior art, the invention has the following advantages:
1, the mode for taking anoxic unit mixing aerobic unit water outlet, on the one hand plays dilution to organic wastewater with difficult degradation thereby and makees With, reduce bio-toxicity;Contain a large amount of nitration products, under anaerobic condition, denitrifying bacterium in the water outlet of another aspect aerobic unit It will be metabolized using hardly degraded organic substance as electron donor using the oxygen in nitrate nitrogen and nitrite nitrogen as electron acceptor Activity, and then further decrease Ecotoxicology by denitrification Synergistic degradation hard-degraded substance in anoxic unit and mention The degradation rate of high hardly degraded organic substance can solve Accumulation of Organic Acids problem in system while improving biological transformation ratio.
2, need to add nitrosation dominant microflora in aerobic unit, on the one hand by artificially changing the biology in activated sludge Amount improves treatment effeciency, on the other hand can shorten nitration reaction time, save the cost.Add the aerobic of nitrosation dominant bacteria For unit compared with common aeration unit, required dissolved oxygen concentration is low, can substantially reduce aeration quantity, reduces because of aeration generation Operating cost;It does not have excessive dissolved oxygen simultaneously and enters the anoxic zone of front end with reflux sewage, so that mainly being sent out in anoxic zone Raw anaerobic bacteria anaerobic metabolism organic matter and amphimicrobe utilize two processes of oxygen metabolism organic matter in nitrite nitrogen.
Specific embodiment
The processing method of organic wastewater with difficult degradation thereby proposed by the present invention, mainly by containing a large amount of nitrous acid in aerobic unit The sewage backflow of salt nitrogen to anoxic unit is realized, needs to control the reflux ratio of nitrosoation rate and aerobic unit water outlet.Good Oxygen unit and denitrogenation unit add the raising that high-effective microorganism microbial inoculum realizes nitrosoation rate and denitrification rates respectively.The present invention passes through The mutual cooperation of a variety of floras and adaptation to environment, have that good waste water treatment effect, wastewater treatment process be short, at low cost, mistake Journey is controllable, the characteristics of stable operation can be achieved.
The nitrosation dominant bacteria that aerobic unit of the present invention adds is prepared according to CN201010221166.8 the method, nitrous The acquisition for changing dominant bacteria includes following three cultivation stages: first stage: the mixed bacterial of enrichment Nitrosomas and Nitromonas obtains Ammonia nitrogen removal frank is obtained up to 90% or more nitrifying bacteria community;Second stage: using high-temperature cultivation and the side of room temperature culture alternately Method carries out Nitromonas elutriation, the superiority of Nitrosomas, the alternate culture method of high-temperature cultivation and room temperature culture is gradually increased It carries out 2~6 times, until nitrosoation rate is transferred to phase III culture when being greater than 50%;Phase III: change dissolved oxygen and pH condition into The further of row Nitromonas is eluriated and the stability of Nitrosomas is tamed, and until nitrosoation rate is stablized 65% or more, terminates one The culture in period obtains the flora of nitrococcus dominance, and it is spare then to carry out preservation;Wherein second stage room temperature condition of culture Are as follows: temperature is 30 DEG C, 1~3mg/L of dissolved oxygen, pH value 7.5, and incubation time is 20 days;The condition of second stage high-temperature cultivation are as follows: Temperature is 10 DEG C higher than room temperature cultivation temperature, 1~3mg/L of dissolved oxygen, pH value 7.5, and incubation time is 20 days;Described in phase III Change dissolved oxygen and pH condition refers to every suitable time change dissolved oxygen concentration and pH value control range, total dissolved oxygen concentration Control is controlled in 1~3mg/L, total pH 7.5~9.0;Change dissolved oxygen and pH item every 12h in phase III incubation Part, the culture in such a way that dissolved oxygen content and pH step up.
Each bacterial strain involved in the microbial bacterial agent that denitrogenation unit of the present invention adds according to CN102465103, Side described in CN102465104, CN102465105, CN102465106, CN201110353731.0 and CN201110353742.9 Method is activated and is cultivated, the seed of cultured six kinds of bacterial strains SDN-3, DN-3, FDN-1, FDN-2, FSDN-A and FSDN-C Liquid is spare after being mixed according to the proportion of 1:1:2:2:5:2.
Effect of the invention is further illustrated below with reference to embodiment.
Embodiment 1
Certain waste water contains a small amount of hydro carbons hard-degraded substance, and average COD concentration is 6500mg/L, average BOD concentration is 150mg/L, average total nitrogen concentration are 500mg/L, pH 7.5.Using anoxic unit-aerobic unit-denitrogenation unit of the invention Group technology is handled, wherein nitrosation dominant bacteria control nitrosoation rate is added between 75% ~ 80% in aerobic unit, denitrogenation Unit is that 1200mg/L adds activated sludge first, in accordance with sludge concentration, then according to the 0.5% of handled wastewater volume per hour Add the above-mentioned microbial inoculum being made of six kinds of bacterial strains.The ratio of aerobic unit effluent recycling to anoxic unit is 30%.Total residence time It is 24 hours, up to 98% or more, effluent COD concentration is lower than COD removal rate lower than 120mg/L, total nitrogen concentration after treatment 40mg/L, ammonia nitrogen concentration are lower than 15mg/L.
Embodiment 2
Certain waste water contains a small amount of nitrogen-containing heterocycle compound, and average COD concentration is 4500mg/L, average BOD concentration is 120mg/L, average total nitrogen concentration are 200mg/L, pH 7.8.Using anoxic unit-aerobic unit of the present invention-denitrogenation unit group It closes technique to be handled, wherein aerobic unit adds nitrococcus control nitrosoation rate between 70% ~ 75%, and denitrogenation unit is first It is that 1800mg/L adds activated sludge according to sludge concentration, is then added according to the 0.4% of handled wastewater volume per hour above-mentioned The microbial inoculum being made of six kinds of bacterial strains.The ratio of aerobic unit effluent recycling to anoxic unit is 45%.Total residence time is 24 small When, for COD removal rate up to 97% or more, effluent COD concentration is lower than 35mg/L, ammonia lower than 120mg/L, total nitrogen concentration after treatment Nitrogen concentration is lower than 15mg/L.
Embodiment 3
Waste water is handled with embodiment 2, the difference is that adding according to the 0.8% of handled wastewater volume per hour Microbial inoculum described in CN201210130644.3, wherein SDN-3, DN-3, FDN-1, FDN-2, FSDN-C seed liquor are according to 1:1:2: The ratio of 2:2 mixes.Total residence time is 24 hours, and up to 95% or more, effluent COD concentration is lower than COD removal rate after treatment 120mg/L, total nitrogen concentration are lower than 15mg/L lower than 35mg/L, ammonia nitrogen concentration.
Comparative example 1
Anoxic unit-aerobic unit-denitrogenation unit group technology is equally used to handle the waste water of embodiment 2, Middle aerobic unit does not add nitrosation dominant bacteria, does not control nitrosoation rate, aerobic unit water outlet is largely nitrate nitrogen, nitre Rate is greater than 70%, and other conditions are the same as embodiment 2.COD removal rate is up to 88% after treatment, effluent COD concentration 780mg/ L, total nitrogen concentration 80mg/L, ammonia nitrogen concentration are lower than 15mg/L.It can be seen that aerobic unit do not control nitrosoation rate cannot achieve it is useless The processing up to standard of water.
Comparative example 2
Anoxic unit-aerobic unit-denitrogenation unit group technology is equally used to handle the waste water of embodiment 2, The reflux ratio of middle aerobic unit is controlled as 60%, 70%, 80%, and other conditions are the same as embodiment 2.COD removal rate after treatment Greater than 95%, effluent COD concentration is less than 120mg/L, the minimum 60mg/L of total nitrogen concentration, ammonia nitrogen concentration and is lower than 15mg/L.Thus may be used See, the ratio of aerobic unit effluent recycling to anoxic unit is greater than the range that the present invention is controlled, total in waste water after treatment Nitrogen concentration is still higher, equally cannot achieve the processing up to standard of waste water.

Claims (10)

1. a kind of processing method of organic wastewater with difficult degradation thereby, it is characterised in that mainly include anoxic unit, aerobic unit and denitrogenation Unit adds nitrosation dominant bacteria in aerobic unit, controls in nitrified effluent nitrosoation rate 65% ~ 80%, wherein aerobic unit Water outlet a part is back to anoxic unit, controls reflux ratio 25% ~ 50%, another part enters denitrogenation unit, through denitrogenation unit It is discharged after processing.
2. according to the method for claim 1, it is characterised in that: the operating condition of anoxic unit is that pH is 7.5 ~ 8.5, DO < 0.2mg/L, temperature are 30 ~ 40 DEG C.
3. according to the method for claim 1, it is characterised in that: the nitrosation dominant bacteria of aerobic unit was only needed in the starting period It is added when being lower than 65% with water outlet nitrosoation rate.
4. according to the method for claim 1, it is characterised in that: the cultural method of nitrosation dominant bacteria includes following three trainings The stage of supporting:
First stage: the mixed bacterial of enrichment Nitrosomas and Nitromonas obtains ammonia nitrogen removal frank up to 90% or more nitrifier Group;
Second stage: using high-temperature cultivation and the method for room temperature culture alternately, Nitromonas elutriation is carried out, nitrous is gradually increased The alternate culture method of the superiority of sour bacterium, high-temperature cultivation and room temperature culture carries out 2~6 times, until when nitrosoation rate is greater than 50% It is transferred to phase III culture;Wherein second stage room temperature condition of culture are as follows: temperature is 15~30 DEG C, 0.1~3mg/L of dissolved oxygen, PH value 6~9, incubation time are 5~30 days;The condition of second stage high-temperature cultivation are as follows: temperature is higher than room temperature cultivation temperature by 2~ 20 DEG C, 0.1~3mg/L of dissolved oxygen, pH value 6~9, incubation time is 5~30 days;
Phase III: changing dissolved oxygen and pH condition carries out the further elutriation of Nitromonas and the stability of Nitrosomas is tamed, Until nitrosoation rate is stablized 65% or more, terminate the culture of a cycle, obtain the flora of nitrococcus dominance, then into Row preservation is spare;Change dissolved oxygen and pH condition described in phase III, which refer to, changes dissolved oxygen concentration and pH every suitable time It is worth control range, for total Dissolved Oxygen concentration Control in 0.1~3mg/L, total pH control range is 7.5~9.0;Phase III training During supporting every 8~change dissolved oxygen and pH condition for 24 hours, the culture in such a way that dissolved oxygen content and pH step up, or It is cultivated by random alternation condition.
5. according to method described in claim 1 or 3, it is characterised in that: aerobic unit control DO exists in 0.5 ~ 2.5mg/L, pH 8.2 ~ 8.5, temperature is 30 ~ 35 DEG C.
6. according to the method for claim 1, it is characterised in that: the startup stage that goes into operation takes the side that reflux ratio is gradually increased Formula, specific reflux ratio are needed according to COD:(NO2 --N+NO3 -- N) ratio determine, work as COD:(NO2 --N+NO3 -- N) It needs to reduce reflux ratio when ratio is less than 25, works as COD:(NO2 --N+NO3 -- N) ratio be greater than 50 when, need to increase reflux Than the amplitude for reducing and increasing reflux ratio is no more than 20%.
7. according to the method for claim 1, it is characterised in that: add microbial bacterial agent, the microorganism in denitrogenation unit Microbial inoculum be containing marsh cock Salmonella (Kocuria palustris) FSDN-A, arthrobacterium (Arthrobacter creatinolyticus) FDN-1 and Shui Shi Flavobacterium (Flavobacterium mizutaii) one of FDN-2 or two Kind, simultaneously containing Paracoccus denitrificans (Paracoccus denitrificans) DN-3 and Methylobacterium (Methylobacterium phyllosphaeraeOne or both of) SDN-3, five kinds of bacterial strains are respectively in July, 2011 It 14 and is preserved in " China Committee for Culture Collection of Microorganisms's common micro-organisms center " on March 11st, 2010, preservation is compiled Number be respectively CGMCC NO.5061, CGMCC No.3657, CGMCC No.3659, CGMCC No.3658, CGMCC No.3660;Or the microbial bacterial agent be containing Staphylococcus cohnis (Staphylococcus cohnii) FSDN-C, section Bacillus (Arthrobacter creatinolyticus) FDN-1 and Shui Shi Flavobacterium (Flavobacterium mizutaii) One or both of FDN-2, simultaneously containing Paracoccus denitrificans (Paracoccus denitrificans) DN-3 and methyl bar Bacterium (Methylobacterium phyllosphaeraeOne or both of) SDN-3, five kinds of bacterial strains were respectively at 2011 7 Months 14 days and it is preserved in " China Committee for Culture Collection of Microorganisms's common micro-organisms center ", preservation on March 11st, 2010 Number is respectively CGMCC NO.5062, CGMCC No.3657, CGMCC No.3659, CGMCC No.3658, CGMCC No.3660;Dosage is the 0.5% ~ 1.0% of handled wastewater volume per hour.
8. according to the method for claim 1, it is characterised in that: added in denitrogenation unit and contain Methylobacterium simultaneously (Methylobacterium phyllosphaerae) SDN-3, Paracoccus denitrificans (Paracoccus denitrificans) DN-3, arthrobacterium (Arthrobacter creatinolyticus) FDN-1, Shui Shi Flavobacterium (Flavobacterium mizutaii) FDN-2, marsh cock Salmonella (Kocuria palustris) FSDN-A and Staphylococcus cohnis (Staphylococcus cohnii) six kinds of bacterial strains of FSDN-C microbial inoculum, the thallus volume ratios of six kinds of bacterium is 1:1:1 ~ 5:1 ~ 5:1 ~ 10:1 ~ 3, six kinds of bacterial strains are preserved in " Chinese microorganism strain preservation pipe respectively on March 11st, 2010 and on July 14th, 2011 Reason committee common micro-organisms center ", deposit number are respectively CGMCC No.3660, CGMCC No.3658, CGMCC No.3657, CGMCC No.3659, CGMCC NO.5061 and CGMCC NO.5062.
9. according to the method for claim 8, it is characterised in that: microbial inoculum dosage is handled wastewater volume per hour 0.1%~0.5%。
10. according to the method for claim 1, it is characterised in that: denitrogenation unit is according to sludge concentration before microbial inoculum adds 1000 ~ 2000mg/L adds denitrifying activated sludge.
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