CN114314841A - Immobilized biological filter biofilm formation method - Google Patents
Immobilized biological filter biofilm formation method Download PDFInfo
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- CN114314841A CN114314841A CN202210118067.XA CN202210118067A CN114314841A CN 114314841 A CN114314841 A CN 114314841A CN 202210118067 A CN202210118067 A CN 202210118067A CN 114314841 A CN114314841 A CN 114314841A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a membrane hanging method for an immobilized biological filter, which comprises the following steps: s1, adding clear water into a regulating tank, putting the activated strains, the activated nutrient source and the activated carrier for 7-15 days into the regulating tank for hydrolytic acidification, wherein a hydrolytic acidification unit needs to be aerated for 7 days (DO is more than 4) on the premise of water temperature of 22 ℃; s2, after 7 days, turning off oxygen supply to culture the anaerobic flora, discharging the anaerobic flora into an anaerobic pool through hydrolysis precipitation, and culturing the anaerobic flora; s3, putting the strains, the nutrient source and the carrier into an anaerobic tank for anaerobic precipitation, and finally discharging into an aeration tank. According to the membrane hanging method for the immobilized biological filter, the microorganism load of the carrier after membrane hanging can reach 26.11g/L, the load capacity of the carrier is greatly increased, meanwhile, the whole method is simple in step, and pollutants can be effectively oxidized, consumed and decomposed, so that sewage is purified, and the treatment efficiency of the filter is improved.
Description
Technical Field
The invention relates to the technical field of biological filters, in particular to a membrane hanging method for an immobilized biological filter.
Background
The biological filter is a membrane biological treatment process, microorganisms are attached to the surface of a carrier, and when sewage flows through the surface of the carrier, pollutants are oxidized, consumed and decomposed through the adsorption of organic nutrient substances, the diffusion inside the biological membrane, the biological oxidation generated in the biological membrane and the like, so that the sewage is purified.
The existing biofilm culturing method for the biological filter is relatively complicated in steps, the load of a carrier is limited, and the treatment efficiency of the filter cannot be improved. Therefore, we propose a membrane hanging method for the immobilized biological filter.
Disclosure of Invention
The invention aims to provide a membrane hanging method for an immobilized biological filter, which aims to solve the problems that the existing membrane hanging method for the biological filter in the prior art is complicated in steps, limited in load of a used carrier and incapable of improving the treatment efficiency of the filter.
In order to achieve the purpose, the invention provides the following technical scheme: the membrane hanging method for the immobilized biological filter comprises the following steps:
s1, adding clear water into a regulating tank, putting the activated strains, the activated nutrient source and the activated carrier for 7-15 days into the regulating tank for hydrolytic acidification, wherein a hydrolytic acidification unit needs to be aerated for 7 days (DO is more than 4) on the premise of water temperature of 22 ℃;
s2, after 7 days, turning off oxygen supply to culture the anaerobic flora, discharging the anaerobic flora into an anaerobic pool through hydrolysis precipitation, and culturing the anaerobic flora;
s3, putting the strains, the nutrient source and the carrier into an anaerobic tank for anaerobic precipitation, and finally discharging into an aeration tank;
s4, putting the strains, the nutrient source and the carrier which grow for 7 days into an aeration tank, refluxing part of the bacteria liquid into a regulating tank, and discharging the bacteria liquid into a secondary sedimentation tank after the bacteria liquid is kept for the effluent retention time of seven hours or more.
S5, after the film is formed, partially discharging the standard bacteria liquid;
s6, putting the low-concentration wastewater into a pretreatment collecting tank until the strains in the adjusting tank, the anaerobic tank and the aeration tank grow mature for 30 days;
and S7, discharging the bacterial liquid after the secondary culture into a pretreatment collecting pool, and then discharging the wastewater in the pretreatment collecting pool into an adjusting pool.
Preferably, when the biofilm formation is started, the water inlet flow rate is smaller than the design value, the operation is started according to 20% -40% of the design flow rate, when the appearance shows that the existing biofilm is generated, the flow rate is increased to 60% -80%, and when the water outlet effect meets the design requirement, the flow rate is increased to the design standard.
Preferably, the environmental conditions required by biofilm culturing are the same as those required by active strain culturing, the inlet water is required to have proper nutrition, temperature, pH value and the like, the number of nutrient elements such as nitrogen, phosphorus and the like must be sufficient, and a large amount of toxic substances is prevented from entering.
Preferably, the initial membrane amount is less, the oxygen filling amount in the reactor is slightly less, so that the dissolved oxygen is not too high, the small-load water inlet is adopted, the scouring of the biological membrane is reduced, and the biofilm formation speed of the filler or the filler is increased.
Preferably, the nutrient sources are proportioned according to the total water holding capacity of the equipment, and the proportion of the nutrient sources in the pool is carbon source: nitrogen source: the phosphorus source is 100: 5: 1, control unit COD: 500-1000 mg per liter.
The invention has the following beneficial effects: according to the membrane hanging method for the immobilized biological filter, the microorganism load of the carrier after membrane hanging can reach 26.11g/L, the load capacity of the carrier is greatly increased, meanwhile, the whole method is simple in step, and pollutants can be effectively oxidized, consumed and decomposed, so that sewage is purified, and the treatment efficiency of the filter is improved.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: the membrane hanging method for the immobilized biological filter comprises the following steps:
s1, adding clear water into a regulating tank, putting the activated strains, the activated nutrient source and the activated carrier for 7-15 days into the regulating tank for hydrolytic acidification, wherein a hydrolytic acidification unit needs to be aerated for 7 days (DO is more than 4) on the premise of water temperature of 22 ℃;
s2, after 7 days, turning off oxygen supply to culture the anaerobic flora, discharging the anaerobic flora into an anaerobic pool through hydrolysis precipitation, and culturing the anaerobic flora;
s3, putting the strains, the nutrient source and the carrier into an anaerobic tank for anaerobic precipitation, and finally discharging into an aeration tank;
s4, putting the strains, the nutrient source and the carrier which grow for 7 days into an aeration tank, refluxing part of the bacteria liquid into a regulating tank, and discharging the bacteria liquid into a secondary sedimentation tank after the bacteria liquid is kept for the effluent retention time of seven hours or more.
S5, after the film is formed, partially discharging the standard bacteria liquid;
s6, putting the low-concentration wastewater into a pretreatment collecting tank until the strains in the adjusting tank, the anaerobic tank and the aeration tank grow mature for 30 days;
and S7, discharging the bacterial liquid after the secondary culture into a pretreatment collecting pool, and then discharging the wastewater in the pretreatment collecting pool into an adjusting pool.
The biological filter is placed dive mixer, spiral aeration dish in the bottom, the lectotype of carrier: the carrier has the characteristics of large specific surface area, low addition ratio, high film forming speed, long service life, strong impact resistance, stable unit system and the like.
The carrier is characterized in that: the microbial load of the carrier after the film is formed can reach 26.11g/L (the loss and the loss are not counted); the volume load is up to 8kg BOD5/m 3, the microbial load is as high as 18-40g/L, the volume load can be up to 16kg BOD5/m 3, and the specific surface area is 3.5 multiplied by 105m 2/m 3.
Culturing and domesticating strains in a biological filter: for industrial wastewater which is not easy to degrade, in order to ensure the smooth operation of biofilm formation, corresponding activated sludge can be cultured and domesticated in advance, and then the activated sludge is added into a biological membrane treatment system for biofilm formation, namely, biofilm formation is distributed. The general method is that the active bacterial strain is cultured in domestic sewage or mixed sewage of domestic sewage and industrial waste water, then the bacterial strain or bacterial strain of other similar sewage treatment plants and industrial waste water are put into a circulating pool together, and then the bacterial strain and industrial waste water are put into a biomembrane method treatment facility by a pump, and the effluent and the precipitated bacterial strain flow back to the circulating pool.
After the circulating operation forms the biological membrane, the water is introduced for operation, and the industrial wastewater to be treated is added. 20 percent of industrial wastewater can be firstly added, and after the quality of inlet and outlet water is analyzed, the proportion of the industrial wastewater is gradually increased until all the industrial wastewater is obtained after the biological membrane has a certain treatment effect. The biological membrane can also be directly cultured by using domestic sewage mixed with a small amount (20%) of industrial wastewater, and the proportion of the industrial wastewater is gradually increased after the membrane is successfully hung until all the industrial wastewater is industrial wastewater.
Domestication:
101. when the biofilm formation is started, the water inlet flow rate is smaller than the design value, and the operation can be started according to 20-40% of the design flow rate. When the existing biological film is visible in the appearance, the flow can be improved to 60% -80%, and when the water outlet effect meets the design requirement, the flow can be improved to the design standard.
102. The environmental conditions required by biofilm culturing are the same as those required by active strain culturing, the inlet water is required to have proper nutrition, temperature, pH value and the like, especially the quantity of nutrient elements such as nitrogen, phosphorus and the like must be sufficient, and meanwhile, a large amount of toxic substances is prevented from entering.
103. The initial film amount is small, so the oxygen filling amount in the reactor can be slightly small. The dissolved oxygen is not too high; meanwhile, a small-load water inlet mode is adopted, so that the scouring effect on the biological membrane is reduced, and the speed of the filler or the biofilm formation of the filler is increased.
104. The film is formed at 26-38 ℃ in summer, the whole period is estimated to be more than 40 days, the film is formed at 13 ℃ in winter, and the whole period is prolonged by 2-3 times compared with the warm season.
105. During biofilm culture and biofilm formation, a phenomenon that a large amount of membranous sludge falls off often occurs due to poor adaptability of a newly grown biofilm, so that the phenomenon is normal, and particularly, the phenomenon of membrane falling off is more serious when industrial wastewater is adopted for acclimatization.
106. The thickness of the biological membrane is controlled to be kept about 2mm, the anaerobic layer is not excessively increased, and the biological membrane is dropped in a balanced manner by adjusting the hydraulic load (changing the flow rate of return water) and the like. Meanwhile, microscopic examination is carried out at any time, the change condition of the biological phase of the biological membrane is observed, and the change condition of the types and the quantity of characteristic microorganisms is noticed.
The biofilm formation condition of the laboratory biofilter:
201. nutrient solution:
and (4) proportioning the nutrient solution according to the total water holding capacity of the equipment. The proportion of the nutrient source in the pool is carbon source: nitrogen source: the phosphorus source is 100: 5: 1, control unit COD: 500-1000 mg per liter.
202. Carrier:
adding the carrier according to the amount of 22.5-30% of the volume of the equipment.
203. Aeration:
and controlling aeration pressure and aeration air quantity, and continuously aerating for 24 hours without interruption.
204. Microorganisms:
and (3) adding microorganisms to carry out aeration under the conditions of ensuring the proper temperature, pH, salt content and the like.
205. And (3) detecting data:
detecting COD <100 mg/L, continuously adding the nutrient solution to 500-1000, and determining the activity and concentration of the microorganisms according to the degradation speed of the COD.
206. And (3) observing the conditions:
in the course of operation of the aeration biological filter, the microbial film growing on the filter material is gradually thickened with the operation, the thickness of the microbe is generally controlled within 300-400 μm, and the metabolism capability of the microbial film is controlled to be strongest, so as to ensure the best water quality of the outlet water, when the thickening of the microbial film exceeds the range, the aeration biological filter is stopped to carry out backwashing, and suspended matters and aged microbes intercepted by the filter material are discharged.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The membrane hanging method of the immobilized biological filter is characterized by comprising the following steps:
s1, adding clear water into a regulating tank, putting the activated strains, the activated nutrient source and the activated carrier for 7-15 days into the regulating tank for hydrolytic acidification, wherein a hydrolytic acidification unit needs to be aerated for 7 days (DO is more than 4) on the premise of water temperature of 22 ℃;
s2, after 7 days, turning off oxygen supply to culture the anaerobic flora, discharging the anaerobic flora into an anaerobic pool through hydrolysis precipitation, and culturing the anaerobic flora;
s3, putting the strains, the nutrient source and the carrier into an anaerobic tank for anaerobic precipitation, and finally discharging into an aeration tank;
s4, putting the strains, the nutrient source and the carrier which grow for 7 days into an aeration tank, refluxing part of the bacteria liquid into a regulating tank, and discharging the bacteria liquid into a secondary sedimentation tank after the bacteria liquid is kept for the effluent retention time of seven hours or more.
S5, after the film is formed, partially discharging the standard bacteria liquid;
s6, putting the low-concentration wastewater into a pretreatment collecting tank until the strains in the adjusting tank, the anaerobic tank and the aeration tank grow mature for 30 days;
and S7, discharging the bacterial liquid after the secondary culture into a pretreatment collecting pool, and then discharging the wastewater in the pretreatment collecting pool into an adjusting pool.
2. A membrane hanging method for an immobilized biological filter according to claim 1, which is characterized in that: the carrier is a customized hydrophilic polyurethane colloidal porous body, when the membrane is hung, the water inlet flow is less than the design value, the operation is started according to 20-40% of the design flow, when the appearance shows that the existing biological membrane is generated, the flow is increased to 60-80%, and when the water outlet effect meets the design requirement, the flow is increased to the design standard.
3. A membrane hanging method for an immobilized biological filter according to claim 1, which is characterized in that: the environmental conditions required by biofilm culturing are the same as those required by active strain culturing, the inlet water is required to have proper nutrition, temperature, pH value and the like, the quantity of nutrient elements such as nitrogen, phosphorus and the like must be sufficient, and a large amount of toxic substances is prevented from entering.
4. A membrane hanging method for an immobilized biological filter according to claim 1, which is characterized in that: the initial film amount is less, the oxygen filling amount in the reactor is less, so that the dissolved oxygen is not too high, the small-load water inlet is adopted, the scouring of the biological film is reduced, and the film hanging speed of the filler or the filler is increased.
5. A membrane hanging method for an immobilized biological filter according to claim 1, which is characterized in that: the nutrient sources are proportioned according to the total water holding capacity of the equipment, and the proportion of the nutrient sources in the pool is a carbon source: nitrogen source: the phosphorus source is 100: 5: 1, control unit COD: 500-1000 mg per liter.
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Cited By (1)
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| CN116553714A (en) * | 2023-01-04 | 2023-08-08 | 广东桃林生态环境有限公司 | Film forming method using organic composite carbon source as film forming carrier, biological film and application |
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