CN106554082B - Biological treatment method of refractory organic wastewater - Google Patents
Biological treatment method of refractory organic wastewater Download PDFInfo
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Abstract
The invention discloses a biological treatment method of refractory organic wastewater, which comprises an anoxic unit, an aerobic unit and a denitrification unit, wherein nitrosation dominant bacteria and nitrite growth promoters are added into the aerobic unit, the nitrifying rate in effluent is controlled to be 65-80%, one part of the effluent of the aerobic unit flows back to the anoxic unit, the reflux ratio is controlled to be 25-50%, the other part of the effluent enters the denitrification unit, and the effluent is treated by the denitrification unit and then discharged; the growth promoter comprises metal salt, polyamine substance, organic acid hydroxylamine and Na2SO3The metal salt is composed of calcium salt, copper salt, magnesium salt and/or ferrous salt. The invention exerts the synergistic effect among the floras by adding the growth promoter and regulating and controlling the reflux ratio of the effluent of the aerobic unit, thereby realizing the dual standard-reaching treatment of COD and total nitrogen in the wastewater. The method has the characteristics of short flow, land occupation saving, low reflux ratio, small microbial inoculum adding amount, stable control, high treatment efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a biological treatment method of refractory organic wastewater.
Background
With the rapid development of industries such as petrochemical industry, plastics, synthetic fibers, printing and dyeing, coal chemical industry and the like, particularly the continuous use of new technologies and new materials, the types of refractory organic pollutants in the wastewater generated by enterprises are gradually increased, and the difficulty in treating the wastewater is increased. Although the physicochemical methods such as advanced oxidation can treat the organic wastewater which is difficult to degrade, the methods have the defects of high cost, incomplete mineralization, easy generation of secondary pollution and the like, and are commonly used for pretreatment of biological treatment to improve biodegradability. Biological treatment is increasingly concerned in the treatment process of refractory organic wastewater due to small investment, low treatment cost and complete mineralization and is used as a terminal technology for wastewater treatment.
Pollutants in refractory organic wastewater mainly comprise hydrocarbons, phenols, polycyclic aromatic compounds, nitro compounds, nitrogen-containing heterocyclic compounds and the like, and especially most of artificially synthesized organic matters cannot be rapidly identified by microorganisms, have an inhibiting effect on the microorganisms and cannot be decomposed and utilized by the microorganisms in a short period, so that the microorganisms naturally cultured and acclimated by using activated sludge in the traditional biological treatment method cannot effectively remove the pollutants in the wastewater.
Wuyucheng et al (environmental science, 1999 (06)) developed a study on the microbial degradation of benzene in groundwater under denitrification conditions, and found that under enhanced denitrification conditions, microbes can degrade benzene using nitrate as an electron acceptor. Plum singing et al (anoxic degradation mechanism of several nitrogen-containing heterocyclic compounds in coking wastewater, proceedings of the university of the same society, 2001 (06)) conducted anoxic denitrification studies on several nitrogen-containing heterocyclic compounds in coking wastewater. Shenhai rainbow et al (research on removing refractory heterocyclic compound pyridine by anoxic denitrification, Shanghai environmental science 2001 (11)) studied on heterocyclic compound pyridine by anoxic denitrification, all affirmed the effect of anoxic denitrification on removing refractory organic matter. Therefore, adding nitrate into toxic or hardly degradable organic wastewater under the anoxic condition as an electron acceptor to remove organic matters in the water is a new sewage treatment method. The anaerobic hydrolysis acidification process has certain advantages for treating organic wastewater difficult to degrade, but still has the problems of low biotransformation rate, limited tolerance degree of anaerobic hydrolysis acidification microorganisms to pollutant concentration, organic acid accumulation in a hydrolysis acidification system and the like. With the increasingly outstanding contradiction of long process flow, large occupied area and complex operation of the traditional activated sludge treatment process, people try to improve the degradation efficiency of the organic wastewater difficult to degrade by improving metabolic strains and improving and optimizing a reaction process.
CN201010218533.9 discloses a composite efficient microbial preparation for treating refractory wastewater, and preparation and application thereof, the invention solves the treatment problem of refractory organic wastewater by adding a microbial inoculum, but the process is not optimized, and the retention time of wastewater treatment is still more than 60 hours. CN200710090244.3 discloses a method for deeply denitrifying high-concentration organic wastewater, which comprises an anaerobic decarbonization zone, an aerobic nitrosation zone, an anaerobic ammoxidation denitrification zone and a traditional nitrification denitrification zone which are sequentially connected in series, wherein the method is required to be composed of six independent reaction tanks, the treatment process is long, and the treatment effect of wastewater containing refractory organic matters is not involved. CN201110007336.7 discloses a double-reflux denitrification MBR process for treating dry acrylic fiber wastewater, which mainly comprises a preposed anoxic tank, a nitrification tank, a postposed anoxic tank and an MBR, and the removal of organic matters and ammonia nitrogen is realized by arranging a double-reflux system of nitrification liquid and sludge concentrated liquid. Compared with the common preposed anoxic-aerobic MBR reactor with the reflux ratio of 200-400%, the invention has the advantages that the reflux ratio of the nitrifying liquid in the aerobic tank is 150%, the operation cost is reduced by 38-45%, the total hydraulic retention time is 30 hours, the COD removal rate reaches 70-80%, the COD concentration of the effluent is 190-360mg/L, and the COD in the effluent can reach the discharge standard by further treatment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a biological treatment method of refractory organic wastewater. The invention exerts the synergistic effect among the floras by adding the growth promoter and regulating and controlling the reflux ratio of the effluent of the aerobic unit, thereby realizing the dual standard-reaching treatment of COD and total nitrogen in the wastewater. The method has the characteristics of short flow, land occupation saving, low reflux ratio, small microbial inoculum adding amount, stable control, high treatment efficiency and the like.
The invention relates to a biological treatment method of refractory organic wastewater, which comprises an anoxic unit, an aerobic unit and a denitrification unit, wherein nitrite dominant bacteria and nitrite growth promoter are added into the aerobic unit, the nitrifying rate in effluent is controlled to be 65-80%, one part of the effluent from the aerobic unit flows back to the anoxic unit, the reflux ratio is controlled to be 25-50%, the other part of the effluent enters the denitrification unit, and the effluent is discharged after being treated by the denitrification unitPlacing; the growth promoter comprises metal salt, polyamine substance, organic acid hydroxylamine and Na2SO3The metal salt is composed of calcium salt, copper salt, magnesium salt and/or ferrous salt.
The growth promoter of the invention comprises 40-100 parts by weight of metal salt, preferably 50-80 parts by weight, 5-30 parts by weight of polyamine substance, preferably 10-20 parts by weight, 0.05-1.5 parts by weight of hydroxylamine organic acid, preferably 0.1-1.0 part by weight, and Na2SO3Is 10 to 40 parts by weight, preferably 20 to 30 parts by weight.
The metal salt in the growth promoter of the present invention comprises calcium salt, copper salt, magnesium salt and/or ferrous salt, such as calcium salt, iron salt and copper salt, wherein Ca2+、Fe2+And Cu2+The molar ratio of (5-15): (1-8): 0.5-5, preferably (8-12): 2-6): 1-4; or calcium, magnesium and copper salts, of which Ca is present2+、Mg2+And Cu2+The molar ratio of (5-15): (5-25): 0.5-5), preferably (8-12): 10-20): 1-4; or calcium, magnesium, iron and copper salts, wherein Ca2+、Mg2+、Fe2 +And Cu2+The molar ratio of (5-15): (5-25): 1-8): 0.5-5, preferably (8-12): 10-20): 2-6): 1-4.
The calcium salt in the growth promoter is CaSO4Or CaCl2Preferably CaCl2(ii) a The magnesium salt is MgSO4Or MgCl2Preferably MgCl2(ii) a The copper salt being CuSO4Or CuCl2Preferably CuCl2(ii) a The iron salt is FeSO4Or FeCl2Preferably FeCl2。
The polyamine substance in the growth promoter is spermine, spermidine or a mixture of spermine and spermidine. The organic acid hydroxylamine is hydroxylamine formate, hydroxylamine acetate or a mixture of the two.
The aerobic unit of the invention can ensure that the effluent of the aerobic unit flows back to the anoxic zone to promote the removal of toxic and refractory substances and improve the degradation rate by controlling the nitrosation rate to be between 65 and 80 percent. Nitrite dominant bacteria and a nitrite bacteria growth promoter are added into an aerobic unit, wherein the adding amount of the promoter is 10-40mg/L, preferably 20-30mg/L, of the promoter concentration in the sewage treatment system. On one hand, the biomass in the activated sludge is artificially changed, the treatment efficiency is improved, on the other hand, the nitration reaction time can be shortened, and the cost is saved. Compared with the common aeration unit, the aerobic unit added with the nitrosobacteria has low concentration of dissolved oxygen, can greatly reduce the aeration quantity and reduce the operating cost caused by aeration; meanwhile, excessive dissolved oxygen can not enter the front-end anoxic zone along with the backflow sewage, so that two processes of anaerobic organism metabolism and facultative bacteria utilization of the oxygen metabolism organism in the nitrite nitrogen mainly occur in the anoxic zone.
The operating conditions of the anoxic unit are that the pH is 7.5-8.5, the DO is less than 0.2mg/L and the temperature is 30-40 ℃. The superior nitrosobacteria in the aerobic unit of the invention only need to be added in the start-up period, the obtaining of the superior nitrosobacteria is well known by the technical personnel in the field, and the superior flora obtained by the method described in CN201010221166.8 is preferably added. The DO of the aerobic unit is controlled to be 0.5-2.5mg/L, the pH is controlled to be 8.2-8.5, and the temperature is controlled to be 30-35 ℃.
Part of the effluent of the aerobic unit reflows to the anoxic unit, the reflux ratio is controlled to be 25-50%, and a mode of gradually increasing the reflux ratio is adopted in the start-up and starting stage. The specific reflux ratio is required according to COD: (NO)2 --N+NO3 --N), when COD: (NO)2 --N+NO3 --N) is less than 25, the reflux ratio needs to be lowered when the COD: (NO)2 --N+NO3 --N) is greater than 50, it is necessary to increase the reflux ratio by a magnitude not exceeding 20%.
According to the invention, a microbial agent is added into the denitrification unit, preferably the microbial agent described in CN201210130645.8 or CN201210130644.3, and the adding amount is 0.01-0.1% of the volume of the wastewater treated per hour. More preferably, the feed also contains Methylobacterium(s) (ii)Methylobacterium phyllosphaerae) SDN-3、Paracoccus denitrificans (A)Paracoccus denitrificans) DN-3, Arthrobacter (A)Arthrobacter creatinolyticus) FDN-1, Flavobacterium aquatile: (Flavobacterium mizutaii) FDN-2, Coccocus palustris: (Kocuria palustris) FSDN-A and Staphylococcus cohnii (II)Staphylococcus cohnii) And (3) microbial inoculum of six FSDN-C strains, wherein the volume ratio of the six strains is 1: 1: 1-5: 1-5: 1-10: 1-3 (calculated by the thallus volume, the thallus volume is the thallus volume obtained by centrifugal separation of bacteria liquid containing culture solution for 5min under the condition of 1 ten thousand revolutions, the same is shown below), and the adding amount is 0.01-0.05% of the volume of the wastewater treated per hour. The six strains are strains described in CN102465103, CN102465104, CN102465105, CN102465106, CN103103141 and CN 103103142. The denitrification unit firstly feeds denitrification activated sludge according to the MLSS of 1000-2000mg/L before the microbial inoculum is fed.
In the invention, the mode of mixing the anoxic unit with the aerobic unit to discharge water is adopted, so that the degradation-resistant organic wastewater is diluted and the biological toxicity is reduced; on the other hand, the effluent of the aerobic unit contains a large amount of nitration products, in an anoxic state, denitrifying bacteria use refractory organics as electron donors, and oxygen in nitrate nitrogen and nitrite nitrogen as electron acceptors to carry out metabolic activities, so that the refractory substances are synergistically degraded in the anoxic unit through denitrification, the microbial toxicity is further reduced, the degradation rate of the refractory organics is improved, the biotransformation rate is improved, and the problem of organic acid accumulation in a system can be solved.
After adding nitrite bacteria growth promoter, the invention can lead nitrite bacteria in the activated sludge to be in metal salt, polyamine substances, organic acid hydroxylamine and Na2SO3Under the combined action of the two components, the rapid proliferation is realized, the adding amount of nitrite bacteria, organic acid hydroxylamine and Na are reduced2SO3The addition of the nitrate inhibitor can effectively control the dissolved oxygen of the system, is beneficial to inhibiting nitrite nitrogen from being further converted into nitrate nitrogen, and further can control the nitration reaction process and improve the treatment effect of wastewater. The invention adopts the combined action of adding the nitrite growth promoter and matching with various flora and processes, and has the advantages of good wastewater treatment effect, short wastewater treatment flow and low costLow dosage of the microbial inoculum, controllable process and stable operation.
Detailed Description
The invention provides a biological treatment method of refractory organic wastewater, which is mainly realized by refluxing sewage containing a large amount of nitrite nitrogen in an aerobic unit to an anoxic unit, wherein nitrosation dominant bacteria and nitrite growth promoters need to be added into the aerobic unit to control the nitrosation rate and the reflux ratio of effluent of the aerobic unit, and efficient microbial agents are added into a denitrification unit to improve the nitrosation rate and the denitrification rate.
The nitrite bacteria growth promoter used in the embodiment of the invention can be prepared according to the methods of CN201410585483.6, CN201410585481.7 and CN201410585655. X. Firstly, preparing metal salt solution according to the proportion and the formula of the nitrite bacteria growth accelerant in the table 1, and adding polyamine substances, organic acid hydroxylamine and Na before use2SO3Adding the nitrite bacteria growth promoter into a metal salt solution to prepare the nitrite bacteria growth promoter I-II, wherein the concentration of the promoter is 0.5 g/L.
TABLE 1 formula and proportion of nitrite bacteria growth promoter
The superior nitrosobacteria added in the aerobic unit is prepared according to the method of CN201010221166.8, and the obtaining of the superior nitrosobacteria comprises the following three culture stages: the first stage is as follows: enriching mixed flora of nitrite bacteria and nitrate bacteria to obtain nitrifying flora with ammonia nitrogen removal rate of more than 90%; and a second stage: elutriating the nitrobacteria by adopting a method of alternately performing high-temperature culture and normal-temperature culture to gradually improve the dominant position of the nitrosobacteria, performing the alternate culture method of the high-temperature culture and the normal-temperature culture for 2-6 times, and transferring to the third stage of culture when the nitrosation rate is more than 50%; and a third stage: changing the conditions of dissolved oxygen and pH to further elutriate the nitrobacteria and stably domesticate the nitrosobacteria until the nitrosation rate is stabilized above 65 percent, finishing the culture of one period to obtain a flora with dominant nitrosobacteria, and then preserving for later use; wherein the second stage normal temperature culture conditions are as follows: the temperature is 30 ℃, the dissolved oxygen is 1-3 mg/L, the pH value is 7.5, and the culture time is 20 days; the conditions of the second stage high temperature culture are as follows: the temperature is 10 ℃ higher than the normal temperature culture temperature, the dissolved oxygen is 1-3 mg/L, the pH value is 7.5, and the culture time is 20 days; changing the dissolved oxygen and pH conditions in the third stage means that the dissolved oxygen concentration and the pH value control range are changed at proper time intervals, the total dissolved oxygen concentration is controlled to be 1-3 mg/L, and the total pH is controlled to be 7.5-9.0; changing dissolved oxygen and pH conditions every 12h during the third stage culture process, and culturing according to the mode that the dissolved oxygen content and the pH are gradually increased.
Each strain related to the microbial agent added into the denitrification unit is activated and cultured according to CN102465103, CN102465104, CN102465105, CN102465106, CN103103141 and CN103103142, and seed solutions of the cultured six strains SDN-3, DN-3, FDN-1, FDN-2, FSDN-A and FSDN-C are mixed according to the proportion of 1: 1: 2: 2: 5: 2 for standby after mixing.
The following examples are given to further illustrate the effects of the present invention, but are not intended to limit the present invention.
Example 1
A certain waste water contains a small amount of hydrocarbon refractory substances, the average COD concentration is 6500mg/L, the average BOD concentration is 150mg/L, and the average total nitrogen concentration is 500mg/L, pH and is 7.5. The anaerobic unit-aerobic unit-denitrification unit combined process is adopted for treatment, wherein nitrite dominant bacteria are added into the aerobic unit according to the concentration of the nitrite dominant bacteria in a sewage treatment system of 600mg/L, meanwhile nitrite growth promoter I is added into the sewage treatment system according to the concentration of the promoter of 20mg/L, the nitrosation rate is controlled to be 75-80%, the denitrification unit firstly adds activated sludge according to the concentration of the sludge of 1200mg/L, and then the microbial inoculum consisting of six strains is added according to 0.04% of the volume of the waste water treated per hour. The proportion of the effluent of the aerobic unit flowing back to the anoxic unit is 30 percent. The total retention time is 24 hours, the COD removal rate after treatment reaches more than 98 percent, the COD concentration of effluent is lower than 120mg/L, the total nitrogen concentration is lower than 40mg/L, and the ammonia nitrogen concentration is lower than 15 mg/L.
Example 2
A certain wastewater contains a small amount of nitrogen-containing heterocyclic compounds, the average COD concentration is 4500mg/L, the average BOD concentration is 120mg/L, and the average total nitrogen concentration is 200mg/L, pH and is 7.8. The anaerobic unit-aerobic unit-denitrification unit combined process is adopted for treatment, wherein the aerobic unit adds nitrosobacteria according to the concentration of the nitrosobacteria in a sewage treatment system of 500mg/L, and simultaneously adds nitrite growth promoter II according to the concentration of the promoter in the sewage treatment system of 25mg/L, the nitrosation rate is controlled to be between 70 and 75 percent, the denitrification unit firstly adds activated sludge according to the concentration of the sludge of 1800mg/L, and then adds a microbial inoculum described by CN201210130644.3 according to 0.08 percent of the volume of the treated wastewater per hour, wherein the volume ratio of SDN-3, DN-3, FDN-1, FDN-2 and DN FSC is 1: 1: 2: 2: 2. the proportion of the effluent of the aerobic unit flowing back to the anoxic unit is 45 percent. The total retention time is 24 hours, the COD removal rate after treatment reaches more than 97 percent, the COD concentration of effluent is lower than 120mg/L, the total nitrogen concentration is lower than 35mg/L, and the ammonia nitrogen concentration is lower than 15 mg/L.
Comparative example 1
The wastewater in the embodiment 1 is treated by adopting the combined process of an anoxic unit, an aerobic unit and a denitrification unit, wherein the aerobic unit adds nitrosobacteria according to the concentration of the dominant nitrifying bacteria in the wastewater treatment system of 600mg/L without adding a nitrite growth promoter, the COD removal rate after treatment is up to 88 percent under the same conditions as the embodiment 1, the COD concentration of the effluent is 780mg/L, the total nitrogen concentration is 80mg/L, and the ammonia nitrogen concentration is lower than 15 mg/L. Therefore, only the nitrosation dominant bacteria are added into the aerobic unit, and the standard treatment of the wastewater cannot be realized without using a growth promoter.
Comparative example 2
The wastewater in the embodiment 1 is treated by adopting the combined process of an anoxic unit, an aerobic unit and a denitrification unit, wherein the aerobic unit does not add a nitrite growth promoter, nitrosation dominant bacteria are added according to the concentration of the nitrite dominant bacteria in a sewage treatment system of 1500mg/L, the nitrosation rate is controlled to be 70-75%, other conditions are the same as the embodiment 1, the COD removal rate after treatment is 87% at most, the effluent COD concentration is 800mg/L, the total nitrogen concentration is 100mg/L, and the ammonia nitrogen concentration is 45 mg/L. Therefore, even if high-concentration nitrosobacteria are added into the aerobic unit, the standard treatment of the wastewater can not be realized under the condition of not adding the growth promoter of the nitrite bacteria.
Comparative example 3
The wastewater of example 2 is treated by the combined process of anoxic unit-aerobic unit-denitrification unit, wherein the reflux ratio of the aerobic unit is 100%, the other conditions are the same as example 1, the COD removal rate after treatment is more than 97%, the COD concentration of the effluent is less than 120mg/L, the minimum total nitrogen concentration is 60mg/L, and the ammonia nitrogen concentration is less than 15 mg/L. Therefore, the proportion of the effluent of the aerobic unit flowing back to the anoxic unit is larger than the range controlled by the invention, the total nitrogen concentration in the treated wastewater is still higher, and the wastewater can not reach the standard.
Claims (7)
1. A biological treatment method of refractory organic wastewater is characterized by comprising an anoxic unit, an aerobic unit and a denitrification unit, wherein nitrosation dominant bacteria and nitrite growth promoters are added into the aerobic unit, the nitrifying rate in effluent is controlled to be 65-80%, one part of the effluent of the aerobic unit flows back to the anoxic unit, the reflux ratio is controlled to be 25-50%, and the other part of the effluent enters the denitrification unit and is discharged after being treated by the denitrification unit; the nitrite bacteria growth promoter comprises metal salt, polyamine substances, organic acid hydroxylamine and Na2SO3The metal salt is composed of calcium salt, copper salt, magnesium salt and/or ferrous salt; the nitrite bacteria growth promoter contains metal salt 40-100 weight portions, polyamine 5-30 weight portions, organic hydroxylamine acid 0.05-1.5 weight portions, and Na2SO310-40 parts by weight; the polyamine substance in the nitrite bacteria growth promoter is spermine, spermidine or the mixture of the spermine and the spermidine; the organic acid hydroxylamine is hydroxylamine formate, hydroxylamine acetate or a mixture of the two; the metal salt in the nitrite bacteria growth promoter is calcium salt, iron salt and copper salt, wherein Ca2+、Fe2+And Cu2+The molar ratio of (5-15) to (1-8) to (0.5-5); or calcium, magnesium and copper salts, of which Ca is present2+、Mg2+And Cu2+The molar ratio of (5-15): (5-25) 0.5-5; or calcium, magnesium, iron and copper salts, wherein Ca2+、Mg2+、Fe2+And Cu2+The molar ratio of (5-15): (5-25): (1-8): 0.5-5); adding the staphylococcus aureus(s) (into the denitrification unit)Staphylococcus cohnii) FSDN-C, Arthrobacter (A)Arthrobacter creatinolyticus) FDN-1 and Flavobacterium aquatile (F: (F;)Flavobacterium mizutaii) One or two of FDN-2, and Paracoccus denitrificans: (Paracoccus denitrificans) DN-3 and Methylobacterium (M) ((M))Methylobacterium phyllosphaerae) One or two of SDN-3; or adding the bacteria containing the swamp cockleburKocuria palustris) FSDN-A, Arthrobacter (A)Arthrobacter creatinolyticus) FDN-1, Flavobacterium aquatile: (Flavobacterium mizutaii) FDN-2, Paracoccus denitrificans: (Paracoccus denitrificans) DN-3 and Methylobacterium (M) ((M))Methylobacterium phyllosphaerae) Five bacterial strains of SDN-3; or adding the mixture containing the methylobacterium (A), (B) and (C)Methylobacterium phyllosphaerae) SDN-3, Paracoccus denitrificans: (Paracoccus denitrificans) DN-3, Arthrobacter (A)Arthrobacter creatinolyticus) FDN-1, Flavobacterium aquatile: (Flavobacterium mizutaii) FDN-2, Coccocus palustris: (Kocuria palustris) FSDN-A and Staphylococcus cohnii (II)Staphylococcus cohnii) Six bacterial agents of FSDN-C.
2. The method of claim 1, wherein: the calcium salt in the nitrite bacteria growth promoter is CaSO4Or CaCl2Magnesium salt is MgSO4Or MgCl2The copper salt is CuSO4Or CuCl2The iron salt is FeSO4Or FeCl2。
3. The method of claim 1, wherein: the addition amount of the nitrite bacteria growth promoter is added according to the concentration of the nitrite bacteria growth promoter in the sewage treatment system of 10-40 mg/L.
4. The method of claim 1, wherein: the operating conditions of the anoxic unit are that the pH is 7.5-8.5, the DO is less than 0.2mg/L and the temperature is 30-40 ℃; the nitrosobacteria of the aerobic unit only need to be added in the starting period; the DO of the aerobic unit is controlled to be 0.5-2.5mg/L, the pH is controlled to be 8.2-8.5, and the temperature is controlled to be 30-35 ℃.
5. The method of claim 1, wherein: part of the effluent of the aerobic unit flows back to the anoxic unit, the reflux ratio is controlled to be 25-50%, and a mode of gradually increasing the reflux ratio is adopted in the start-up starting stage; the specific reflux ratio is required according to COD: (NO)2 --N+NO3 --N), when COD: (NO)2 --N+NO3 --N) is less than 25, the reflux ratio needs to be lowered when the COD: (NO)2 --N+NO3 --N) is greater than 50, it is necessary to increase the reflux ratio by a magnitude not exceeding 20%.
6. The method of claim 1, wherein: the dosage of the microbial inoculum in the denitrification unit is 0.01-0.1% of the volume of the wastewater treated per hour.
7. The method of claim 1, wherein: when the denitrification unit is added with a microbial inoculum containing six strains, the volume ratio of the six strains is 1: 1: 1-5: 1-5: 1-10: 1-3, the dosage is 0.01-0.05% of the volume of the wastewater treated per hour.
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| CN203754562U (en) * | 2014-02-28 | 2014-08-06 | 苏州格胜环保设备有限公司 | Biological denitrification tank |
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| CN101899401A (en) * | 2009-05-25 | 2010-12-01 | 中国石油化工股份有限公司 | Microbial agent for treating ammonia-containing waste water and preparation method thereof |
| CN203754562U (en) * | 2014-02-28 | 2014-08-06 | 苏州格胜环保设备有限公司 | Biological denitrification tank |
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