CN114314841B - Film hanging method for immobilized biological filter - Google Patents
Film hanging method for immobilized biological filter Download PDFInfo
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- CN114314841B CN114314841B CN202210118067.XA CN202210118067A CN114314841B CN 114314841 B CN114314841 B CN 114314841B CN 202210118067 A CN202210118067 A CN 202210118067A CN 114314841 B CN114314841 B CN 114314841B
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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
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Abstract
The invention discloses a membrane hanging method of an immobilized biological filter, which comprises the following steps: s1, adding clear water into a regulating tank, putting the activated strains, nutrient sources and carriers in the regulating tank for hydrolysis acidification after 7-15 days, wherein the hydrolysis acidification unit is required to be subjected to aeration for 7 days (DO is more than 4) on the premise of water temperature of 22 ℃; s2, after 7 days, closing oxygen supply to culture anoxic flora, and discharging the anoxic flora into an anaerobic tank through hydrolysis precipitation to culture the anoxic flora; s3, placing the strains, the nutrient sources and the carriers into an anaerobic tank for anaerobic precipitation, and finally discharging the strains, the nutrient sources and the carriers into an aeration tank. According to the immobilized biological filter membrane hanging method, the microbial load of the carrier after membrane hanging can reach 26.11g/L, the load of the carrier is greatly increased, and meanwhile, the whole method is simple in steps, and can effectively oxidize, consume and decompose pollutants, so that sewage can be 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 method for forming a membrane of 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, diffusion inside the biological membrane, biological oxidation and other actions in the biological membrane, so that the sewage is purified.
The existing biological filter membrane hanging method is complicated in steps, the loading capacity of the used carrier is limited, and the treatment efficiency of the filter can not be improved. Therefore, we propose a method for forming a membrane of an immobilized biological filter.
Disclosure of Invention
The invention aims to provide a membrane hanging method of an immobilized biological filter, which aims to solve the problems that the prior membrane hanging method of the biological filter is complex in steps, the load capacity of a carrier is limited, and the treatment efficiency of the filter cannot be improved.
In order to achieve the above purpose, the present invention provides the following technical solutions: the immobilized biological filter membrane hanging method comprises the following steps:
s1, adding clear water into a regulating tank, putting the activated strains, nutrient sources and carriers in the regulating tank for hydrolysis acidification after 7-15 days, wherein the hydrolysis acidification unit is required to be subjected to aeration for 7 days (DO is more than 4) on the premise of water temperature of 22 ℃;
s2, after 7 days, closing oxygen supply to culture anoxic flora, and discharging the anoxic flora into an anaerobic tank through hydrolysis precipitation to culture the anoxic flora;
s3, placing the strains, the nutrient sources and the carriers into an anaerobic tank for anaerobic precipitation, and finally discharging into an aeration tank;
s4, placing the strain growing for 7 days, the nutrition source and the carrier into an aeration tank, refluxing part of bacterial liquid to a regulating tank, and discharging the bacterial liquid into a secondary sedimentation tank after maintaining the effluent retention time for seven hours or more.
S5, after film formation is completed, partially discharging the standard bacteria liquid;
s6, placing the low-concentration wastewater into a pretreatment collecting tank until strains of the regulating tank, the anaerobic tank and the aeration tank grow mature for 30 days;
s7, discharging the bacterial liquid after the secondary culture into a pretreatment collecting tank, and then discharging the wastewater in the pretreatment collecting tank into an adjusting tank.
Preferably, when film formation is started, the water inflow rate is smaller than a design value, the operation is started according to 20% -40% of the design flow rate, when the appearance is visible that the existing biological film is generated, the flow rate is increased to 60% -80%, and when the water outflow effect reaches the design requirement, the flow rate is increased to the design standard.
Preferably, the environmental conditions required for film formation are the same as those required for the cultivation of active strains, the water inlet is required to have proper nutrition, temperature, pH 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 are avoided.
Preferably, the initial membrane amount is small, the oxygenation amount in the reactor is small, so that the dissolved oxygen is not too high, and the small-load water inflow is adopted, so that the flushing of the biological membrane is reduced, and the membrane hanging speed of the filler or the filler is increased.
Preferably, the nutrient sources are proportioned according to the total water holding amount of the equipment, and the proportion of the nutrient sources in the pool is as follows: nitrogen source: phosphorus source = 100:5:1, control unit COD: 500-1000 milligrams per liter.
The beneficial effects of the invention are as follows: according to the immobilized biological filter membrane hanging method, the microbial load of the carrier after membrane hanging can reach 26.11g/L, the load of the carrier is greatly increased, and meanwhile, the whole method is simple in steps, and can effectively oxidize, consume and decompose pollutants, so that sewage can be purified, and the treatment efficiency of the filter is improved.
Drawings
Fig. 1 is a flow chart of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution: the immobilized biological filter membrane hanging method comprises the following steps:
s1, adding clear water into a regulating tank, putting the activated strains, nutrient sources and carriers in the regulating tank for hydrolysis acidification after 7-15 days, wherein the hydrolysis acidification unit is required to be subjected to aeration for 7 days (DO is more than 4) on the premise of water temperature of 22 ℃;
s2, after 7 days, closing oxygen supply to culture anoxic flora, and discharging the anoxic flora into an anaerobic tank through hydrolysis precipitation to culture the anoxic flora;
s3, placing the strains, the nutrient sources and the carriers into an anaerobic tank for anaerobic precipitation, and finally discharging into an aeration tank;
s4, placing the strain growing for 7 days, the nutrition source and the carrier into an aeration tank, refluxing part of bacterial liquid to a regulating tank, and discharging the bacterial liquid into a secondary sedimentation tank after maintaining the effluent retention time for seven hours or more.
S5, after film formation is completed, partially discharging the standard bacteria liquid;
s6, placing the low-concentration wastewater into a pretreatment collecting tank until strains of the regulating tank, the anaerobic tank and the aeration tank grow mature for 30 days;
s7, discharging the bacterial liquid after the secondary culture into a pretreatment collecting tank, and then discharging the wastewater in the pretreatment collecting tank into an adjusting tank.
The biological filter is provided with a submersible mixer and a spiral aeration disc at the bottom, and the carrier is selected from the following types: the carrier has the characteristics of large specific surface area, low addition ratio, high film forming speed, long service life, strong shock resistance, stable unit system and the like.
Carrier characteristics: the carrier microorganism load after film hanging can reach 26.11g/L (without loss); the volume load is up to 8kg BOD5/m 3, the microorganism load is large and is up to 18-40g/L, the volume load can be up to 16kg BOD5/m 3, and the specific surface area is 3.5X105 m 2/m 3.
Culturing and domesticating bacteria in a biological filter: for industrial wastewater which is not easy to degrade, in order to ensure smooth operation of film hanging, corresponding activated sludge can be cultivated and domesticated in advance and then added into a biological film treatment system to carry out film hanging, namely film hanging in a distributed mode. The common practice is to culture active bacteria in domestic sewage or its mixed sewage with industrial sewage, then to put the bacteria or other similar bacteria in a circulating pond together with industrial sewage, and then to put the bacteria and other similar bacteria into the facilities of biomembrane process, and the effluent and the deposited bacteria are all returned to the circulating pond.
After the biological film is formed by circulating operation, water is introduced for operation, and industrial wastewater to be treated is added. The method can firstly dose 20% of industrial wastewater, analyze the quality of inlet water and outlet water, and gradually increase the proportion of the industrial wastewater until all the industrial wastewater is obtained after the biological film has a certain treatment effect. The domestic sewage mixed with a small amount (20%) of industrial wastewater can be used for directly culturing the biological membrane, and the proportion of the industrial wastewater is gradually increased after the membrane is successfully formed until the industrial wastewater is completely formed.
Domestication:
101. when film formation is started, the water inflow is smaller than the design value, and the operation can be started according to 20% -40% of the design flow. When the appearance is visible and the existing biological film is generated, the flow can be increased to 60% -80%, and when the water outlet effect reaches the design requirement, the flow can be increased to the design standard.
102. The environmental conditions required for film formation are the same as those required for the cultivation of active strains, and the intake water is required to have proper nutrition, temperature, pH and the like, especially the quantity of nutrient elements such as nitrogen, phosphorus and the like must be sufficient, and meanwhile, a great amount of entry of toxic substances is avoided.
103. The initial membrane amount is smaller, and the oxygenation amount in the reactor can be slightly smaller. So that the dissolved oxygen is not too high; meanwhile, a small-load water inlet mode is adopted, so that the scouring action on the biological film is reduced, and the filling material or the film hanging speed of the filling material is increased.
104. Film is hung at 26-38 ℃ in summer, the whole period is predicted to be more than 40d, film is hung at 13 ℃ in winter, and the whole period is prolonged by 2-3 times than the warm season.
105. During biofilm culturing and film formation, a large amount of membranous sludge often falls off due to poor adaptability of the biofilm just grown, which can be said to be normal, and particularly when industrial wastewater is used for domestication, the film falling off phenomenon is more serious.
106. The thickness of the biofilm is controlled to be about 2mm, the anaerobic layer is not excessively increased, and the biofilm shedding is balanced by adjusting the hydraulic load (changing the reflux water amount) and the like. At the same time, the microscopic examination is carried out at any time, the change condition of the biological phase of the biological film is observed, and the change condition of the types and the numbers of the characteristic microorganisms is noted.
Film hanging condition of laboratory biological filter:
201. nutrient solution:
and proportioning the nutrient solution according to the total water holding amount of the equipment. The proportion of the nutrient sources in the pool is as follows: nitrogen source: phosphorus source = 100:5:1, control unit COD: 500-1000 milligrams per liter.
202. And (3) a carrier:
the carrier is added according to the volume of 22.5% -30% of the equipment.
203. Aerating:
the aeration pressure and the aeration air quantity are controlled, and the continuous aeration is carried out for 24 hours without interruption.
204. Microorganism:
and (3) adding microorganisms to perform stuffy exposure under the condition of ensuring proper temperature, PH, salt and the like.
205. Detection data:
detecting COD <100 mg/L, continuously adding nutrient solution to 500-1000, and determining the activity and concentration of the microorganism according to the degradation speed of COD.
206. Observing:
in the operation process of the aeration biological filter, the microbial film growing on the filter material gradually thickens along with the operation, the thickness of microorganisms is generally controlled to be 300-400 mu m, the metabolism capacity of the biological film is controlled to be strongest, so that the best quality of the discharged water is ensured, and when the microbial film thickens beyond the range, the aeration biological filter stops operation, and suspended matters trapped by the back flushing filter material and aged microorganisms are discharged.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. The immobilized biological filter membrane hanging method is characterized by comprising the following steps:
s1, adding clear water into a regulating tank, putting the activated strains, nutrient sources and carriers in the regulating tank for hydrolysis acidification after 7-15 days, wherein the hydrolysis acidification unit needs to be aerated for 7 days under the premise of water temperature of 22 ℃ so that DO is more than 4;
s2, after 7 days, closing oxygen supply to culture anoxic flora, and discharging the anoxic flora into an anaerobic tank through hydrolysis precipitation to culture the anoxic flora;
s3, placing the strains, the nutrient sources and the carriers into an anaerobic tank for anaerobic precipitation, and finally discharging into an aeration tank;
s4, placing the strain growing for 7 days, the nutrition source and the carrier into an aeration tank, refluxing part of bacterial liquid to a regulating tank, keeping the water outlet residence time in the aeration tank for seven hours or more, and discharging into a secondary sedimentation tank;
s5, after film formation is completed, partially discharging the standard bacteria liquid;
s6, placing the low-concentration wastewater into a pretreatment collecting tank until strains of the regulating tank, the anaerobic tank and the aeration tank grow mature for 30 days;
s7, discharging the bacterial liquid after the secondary culture into a pretreatment collecting tank, and then discharging the wastewater in the pretreatment collecting tank into an adjusting tank.
2. The immobilized biofilter filming method according to claim 1, characterized in that: the carrier is a hydrophilic polyurethane gelatinous porous body which is customized, when film hanging is started, the water inflow rate is smaller than a design value, the operation is started according to 20% -40% of the design flow rate, when the appearance is visible that the existing biological film is generated, the flow rate is increased to 60% -80%, and when the water outflow effect reaches the design requirement, the flow rate is increased to the design standard.
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| CN202210118067.XA CN114314841B (en) | 2022-02-08 | 2022-02-08 | Film hanging method for immobilized biological filter |
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| CN116553714B (en) * | 2023-01-04 | 2023-10-17 | 广东江铜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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