CN109231487B - Preparation for enhancing stability of biomembrane of moving bed biofilm reactor and application thereof - Google Patents
Preparation for enhancing stability of biomembrane of moving bed biofilm reactor and application thereof Download PDFInfo
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- CN109231487B CN109231487B CN201811197162.3A CN201811197162A CN109231487B CN 109231487 B CN109231487 B CN 109231487B CN 201811197162 A CN201811197162 A CN 201811197162A CN 109231487 B CN109231487 B CN 109231487B
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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Abstract
The invention discloses a preparation for enhancing the stability of a biomembrane of a moving bed biofilm reactor and application thereof, wherein the preparation comprises the following components in percentage by weight: 75-90% of population stabilizer; 10-25% of coating agent; the population stabilizer is at least one of ammonium chloride, ammonium sulfate, potassium cyanide and 5, 10-methylene-tetrahydrofuran. The wastewater flows through an anaerobic tank, an anoxic tank and an MBBR reaction tank in sequence, and a biomembrane stabilizing agent is added into the MBBR reaction tank. The invention has good environmental protection benefit and economic benefit. Compared with the MBBR reaction tank without the reinforcing agent, the total amount of the membrane is increased, and the membrane is more stable and is not easy to fall off. Compared with a common reinforcer, the invention can promote the increase of the film hanging speed after the film coating agent is added, improve the stability of the biological film, protect the environment and strengthen the biological film.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a preparation for enhancing the stability of a Moving Bed Biofilm Reactor (MBBR) biofilm and application thereof.
Background
The biomembrane process is a kind of aerobic biological treatment technology for waste water parallel to the activated sludge process, is a fixed membrane process, is the manual and reinforced self-cleaning process of sewage and water body, and mainly removes the soluble and colloidal organic pollutants in the waste water.
The Moving Bed Biofilm Reactor (MBBR) technology is based on the basic principle of the biofilm method, makes full use of the advantages of the activated sludge method and overcomes the defects of the traditional activated sludge method and the fixed biofilm method. According to the method, a certain amount of suspension carriers are added into the reactor, so that the biomass in the reactor is increased, and the treatment efficiency of the reactor is improved. As the density of the filler is close to that of water, the filler is completely mixed with the water during aeration, and the environment for the growth of microorganisms is three phases of gas, liquid and solid. The collision and shearing action of the carrier in water makes air bubbles finer, and the utilization rate of oxygen is increased. Each carrier is a micro-reactor, so that the nitrification reaction and the denitrification reaction exist simultaneously, and the treatment effect is improved.
However, the MBBR technology has very high requirements on the process technology and the working environment, the treatment effect is unstable, and the influence of natural factors is large. With the development of economy, the components of the wastewater become increasingly complex, and the activity of the biofilm-forming microorganisms is influenced by more and more pollutants. And because of the change of complex water quality, the unfavorable water environment can lead to the unstable growth environment of microorganisms, and the severe conditions lead to the continuous occurrence of intraspecific and interspecific competition. Many important biofilm-hanging microorganisms are at a disadvantage in competition, so that the activity of the microorganism population is continuously reduced to influence the growth and stability of the biofilm, the phenomenon that the biofilm is unevenly distributed, does not grow or grows slowly occurs, and finally the effect of sewage treatment is greatly reduced.
Existing methods for enhancing biofilm processes: chinese patent with publication number CN107381777A discloses a method for treating low C/N ratio wastewater by a calcium ion regulation biofilm process to form a rapid biofilm, which adds a certain amount of rhamnolipid and calcium chloride into the low C/N ratio wastewater, and utilizes the complexation of calcium ions and pollutants in the low C/N ratio wastewater to accelerate the attachment and colonization of soluble substances and microorganisms in the wastewater on a filler, thereby improving the biofilm formation effect. The method uses organic matters to easily cause pollution, and needs to measure a plurality of indexes in the early stage, so that the steps are complex; the Chinese patent with publication number CN201710807525.X discloses a method for accelerating biofilm formation of wastewater under low temperature. The Sphingomonas rubra is subjected to low-temperature adaptive culture and added into the reactor to increase extracellular polymers of bacteria, so that the growth of microorganisms on the filler is accelerated, the activity of the microorganisms is improved, the biofilm formation of the wastewater under the low-temperature condition is accelerated, and the formed biofilm is firm, strong in impact load resistance and good in wastewater treatment effect. However, the invention mainly aims at the waste water under low-temperature treatment, needs domestication of bacteria and has complex operation. The Chinese patent with the publication number of CN201710633937.6 discloses a biofilm culturing combined filler with the function of slowing down the aging and shedding of a biofilm. The plastic branches are connected between the two connecting rods, and the front and back surfaces of the inner ring are respectively paved with a biomembrane control net mechanism, and the biomembrane control net mechanism comprises a supporting net, an oxygen permeation net and a separation cavity. The thickening process of the anaerobic membrane of the biological membrane can be controlled, the aging of the biological membrane is slowed down, and the biological membrane is not easy to fall off. However, the invention increases the processing cost due to the addition of the control network mechanism.
Disclosure of Invention
The invention provides a preparation for enhancing the stability of a biological membrane in an MBBR (moving bed biofilm reactor) and a preparation method and application thereof, aiming at the problem that the activity of sludge microorganisms is difficult to maintain.
A preparation for enhancing the stability of a biological membrane in an MBBR (moving bed biofilm reactor) comprises the following components in percentage by weight:
75-90% of population stabilizer
10-25% of coating agent;
the sum of the components is 100 percent; the population stabilizer is at least one of ammonium chloride, ammonium sulfate, potassium cyanide and 5, 10-methylene-tetrahydrofuran.
Further preferably, the weight percentage of each component is as follows:
80-90% of population stabilizer
10-20% of coating agent.
Most preferably, the weight percentage of each component is as follows:
81-85% of population stabilizer
15-19% of coating agent.
The presence of interspecies and intraspecies competition can have a tremendous effect on biofilm formation, the more unstable a microbial population, the longer its period of biofilm formation, and the more difficult it is to maintain a biofilm. While biofilm formation in the whole biological system is significantly increased after the ammonium salt is added, according to the research of the present inventors, population stability can be increased by adding the ammonium salt to the system, because the increase of the ammonium salt can reduce the metabolism of glycine to 5, 10-methylene-tetrahydrofuran, thereby enhancing the metabolism thereof to the HCN direction, so that the HCN content is increased. HCN is a quorum sensing regulatory substance, and an increase in its content can directly lead to a decrease in the amount of competition, thereby making the entire microbial system more stable and thus maintaining the stability of the biofilm.
The invention mainly uses the principle of stable population, strengthening the membrane-hanging adhesion and the like to be coupled, and achieves the effect of strengthening the formation and stability of most of biological membranes economically and efficiently. The stability of microbial populations is enhanced by mixing and adding the population stabilizer, and the intermediate and intraspecific competition is reduced, so that the formation and stability of the biological membrane can be enhanced, the total amount of the biological membrane in the pool is enhanced, the updating period of the biological membrane is prolonged, and the production efficiency is improved. The effect of maintaining the biological membrane can be greatly improved by matching other reagents, and the action time of the preparation is prolonged. Compared with the prior art, the method for maintaining population stability is green, economic, universal, durable and the like.
Wherein, the population stabilizer is used as a main formula. In the reactor, a population stabilizer with a certain concentration is added, and the stability of a biological population is maintained by the population stabilizer to control the stability of a microbial membrane in the biofilm reactor and improve the water treatment efficiency of the biofilm; the coating agent can not only accelerate the maturation of the biological membrane and enhance the stability of the biological membrane for removing organic matters, but also increase the content of extracellular polymeric substances and protein in the biological membrane, and the coagulation effect of the extracellular polymeric substances can improve the film hanging speed of the filler and the biomass attached to the filler; and because the protein contains a large amount of biocatalytic enzyme, the decontamination capability of the biological membrane can be enhanced.
In addition, the experimental reagent amount is trace, so that the cost is reduced, the pollution can be reduced to the maximum extent, and the method has the characteristics of quick response, low cost, wide application range, simple application, low carbon, environmental friendliness and the like.
Preferably, the population stabilizer is at least one of ammonium chloride, ammonium sulfate, potassium cyanide and 5, 10-methylene-tetrahydrofuran, and the population stabilizer can also be formed by mixing the components.
Further preferably, the population stabilizer is ammonium chloride, ammonium sulfate, a mixture of ammonium chloride and 5, 10-methylene-tetrahydrofuran, or a mixture of ammonium sulfate and 5, 10-methylene-tetrahydrofuran, taking into account toxicity of potassium cyanide. Namely, the population stabilizer can be ammonium sulfide or ammonium sulfate alone, or a mixture of ammonium chloride and 5, 10-methylene-tetrahydrofuran or a mixture of ammonium sulfate and 5, 10-methylene-tetrahydrofuran can be selected.
Still more preferably, the population stabilizer is a mixture of ammonium chloride and 5, 10-methylene-tetrahydrofuran or a mixture of ammonium sulfate and 5, 10-methylene-tetrahydrofuran, and the mixture ratio is as follows:
50-70% of ammonium sulfate or ammonium chloride
30-50% of 5, 10-methylene-tetrahydrofuran.
Most preferably, the population stabilizer is prepared by mixing the following components in percentage by weight:
65 to 70 percent of ammonium sulfate
30-35% of 5, 10-methylene-tetrahydrofuran.
The sum of all the components is 100 percent.
It is further preferred that the first and second liquid crystal compositions,
65 to 70 percent of ammonium sulfate
5, 10-methylene-tetrahydrofuran 30-35%
The preparation method of the composite population stabilizer is to uniformly mix all the components.
The composite population stabilizer has better effect than a population stabilizer with a single component, and can better act with other components in a synergistic way to enhance the inhibition effect.
Preferably, the coating agent is at least one of chitosan and alginate, and can also be prepared by mixing the components. The coating agent can not only accelerate the maturation of the biological membrane and enhance the stability of the biological membrane for removing organic matters, but also increase the content of extracellular polymeric substances and protein in the biological membrane, and the coagulation effect of the extracellular polymeric substances can improve the film hanging speed of the filler and the biomass attached to the filler; and because the protein contains a large amount of biocatalytic enzyme, the decontamination capability of the biological membrane can be enhanced. Because the chitosan and alginate have no obvious difference in the film-forming promoting effect, in order to simplify the procedure, the invention adopts the film-forming agent chitosan with a single component.
The preparation method of the preparation comprises the following steps:
firstly, weighing ammonium salt (ammonium sulfate or ammonium chloride) and coating agent chitosan in the population stabilizer according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. Slowly dissolving the obtained powder in 5, 10-methylene-tetrahydrofuran, adding the preparation to the final concentration of 80-100mg/L, and periodically adding every 5-10 days.
The invention also provides a method for enhancing the stability of the biomembrane of the moving bed biofilm reactor, which comprises the following steps:
the wastewater sequentially flows through an anaerobic tank, an anoxic tank and an MBBR reaction tank, and a biomembrane stabilizing preparation is added into the MBBR reaction tank, wherein the biomembrane stabilizing preparation comprises the following components in percentage by weight:
75-90% of population stabilizer
10-25% of coating agent;
the population stabilizer is at least one of ammonium chloride, ammonium sulfate, potassium cyanide and 5, 10-methylene-tetrahydrofuran.
Further preference for population stabilizers in the treatment method is given to the selection in the formulations as described above.
Preferably, the biological membrane stabilizing preparation is periodically added every 5 to 10 days, and the total adding amount is 80 to 100 mg/L.
The film forming amount can be increased by more than 150% in 30 days under the same condition, the raw material proportion, the adding amount and the adding time can be adjusted to be increased to more than 250%, and the film forming time is shortened by 5-10 days.
Further preferably, the biological membrane stabilizing agent is periodically added every 7 to 10 days, and the total adding amount is 90 to 100 mg/L.
In the method of the present invention, it is still further preferred that,
population stabilizer 83-84%
16-17% of a coating agent;
the population stabilizer composition was as follows:
68 to 70 percent of ammonium sulfate
30-32% of 5, 10-methylene-tetrahydrofuran;
and periodically adding the biological membrane stabilizing agent every 9-10 days, wherein the total adding amount is 95-100 mg/L. Under the preferable scheme, the total biofilm formation amount is increased by more than 250 percent in 30 days under the same condition.
The invention has good environmental protection benefit and economic benefit. Compared with the MBBR reaction tank without the reinforcing agent, the total amount of the membrane is increased, and the membrane is more stable and is not easy to fall off. Compared with a common reinforcer, the invention can promote the increase of the film hanging speed after the film coating agent is added, improve the stability of the biological film, protect the environment and strengthen the biological film.
Drawings
FIG. 1 is a Moving Bed Biofilm Reactor (MBBR) flow diagram.
Detailed Description
Example 1:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 55kg of ammonium sulfate and 30kg of 5, 10-methylene-tetrahydrofuran; coating agent: 20kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. The obtained powder was slowly dissolved in 5, 10-methylene-tetrahydrofuran.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the sample injection frequency is once added in 5 days, and the addition amount of the added preparation is shown in table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
Example 2:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 55kg of ammonium sulfate and 30kg of 5, 10-methylene-tetrahydrofuran; coating agent: 20kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. The obtained powder was slowly dissolved in 5, 10-methylene-tetrahydrofuran.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the injection frequency is once added in 7 days, and the addition amount of the added preparation is shown in Table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
Example 3:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 55kg of ammonium sulfate and 30kg of 5, 10-methylene-tetrahydrofuran; coating agent: 20kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. The obtained powder was slowly dissolved in 5, 10-methylene-tetrahydrofuran.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the sample injection frequency is once in 10 days, and the addition amount of the added preparation is shown in Table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
Example 4:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 70kg of ammonium sulfate and 30kg of 5, 10-methylene-tetrahydrofuran; coating agent: 20kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. The obtained powder was slowly dissolved in 5, 10-methylene-tetrahydrofuran.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the sample injection frequency is once added in 5 days, and the addition amount of the added preparation is shown in table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
Example 5:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 70kg of ammonium sulfate and 30kg of 5, 10-methylene-tetrahydrofuran; coating agent: 20kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. The obtained powder was slowly dissolved in 5, 10-methylene-tetrahydrofuran.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the injection frequency is once added in 7 days, and the addition amount of the added preparation is shown in Table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
Example 6:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 70kg of ammonium sulfate and 30kg of 5, 10-methylene-tetrahydrofuran; coating agent: 20kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. The obtained powder was slowly dissolved in 5, 10-methylene-tetrahydrofuran.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the sample injection frequency is once in 10 days, and the addition amount of the added preparation is shown in Table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
Example 7:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 55kg of ammonium sulfate and 35kg of 5, 10-methylene-tetrahydrofuran; coating agent: 20kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. The obtained powder was slowly dissolved in 5, 10-methylene-tetrahydrofuran.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the sample injection frequency is once added in 5 days, and the addition amount of the added preparation is shown in table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
Example 8:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 55kg of ammonium sulfate and 35kg of 5, 10-methylene-tetrahydrofuran; coating agent: 20kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. The obtained powder was slowly dissolved in 5, 10-methylene-tetrahydrofuran.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the injection frequency is once added in 7 days, and the addition amount of the added preparation is shown in Table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
Example 9:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 55kg of ammonium sulfate and 35kg of 5, 10-methylene-tetrahydrofuran; coating agent: 20kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles. The obtained powder was slowly dissolved in 5, 10-methylene-tetrahydrofuran.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the sample injection frequency is once in 10 days, and the addition amount of the added preparation is shown in Table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
Example 10:
(1) the preparation process of the reagent comprises the following steps:
population stabilizer: 85kg of ammonium sulfate; coating agent: 25kg of chitosan. Weighing the ammonium sulfate and the coating agent chitosan according to the mass percentage of each component, drying, dissolving and mixing; mixing in a stirrer, stirring for more than 30 min, sieving with 200 mesh sieve, and filtering to remove larger particles to obtain dry fine powder.
(2) Sample adding conditions: the preparation prepared by the invention enters the reactor in the following feeding mode. The addition place is an MBBR reactor, the sample injection frequency is once added in 5 days, and the addition amount of the added preparation is shown in table 1.
(3) Detection indexes are as follows: observing the COD value of the inlet water and the outlet water of the MBBR, and recording the number of days for completing biofilm formation when the COD removal rate is stable; measuring protease by using a Coomassie brilliant blue method to characterize the amount of the biological membrane; the scale of the treatment was 30L/h. The results are shown in Table 1.
TABLE 1
The above description is only an embodiment of the present invention, but the technical features of the present invention are not limited thereto, and any person skilled in the relevant art can change or modify the present invention within the scope of the present invention.
Claims (6)
1. A preparation for enhancing the stability of a biological membrane in an MBBR (moving bed biofilm reactor) is characterized by comprising the following components in percentage by weight:
75-90% of population stabilizer
10-25% of coating agent;
the population stabilizer is a mixture of ammonium chloride and 5, 10-methylene-tetrahydrofuran or a mixture of ammonium sulfate and 5, 10-methylene-tetrahydrofuran, and the weight percentage ratio is as follows:
50-70% of ammonium sulfate or ammonium chloride
30-50% of 5, 10-methylene-tetrahydrofuran.
2. The preparation according to claim 1, wherein the weight percentage of each component is as follows:
80-90% of population stabilizer
10-20% of coating agent.
3. The preparation of claim 1, wherein the coating agent is at least one of chitosan and alginate.
4. A method for enhancing the stability of a biomembrane of a moving bed biofilm reactor is characterized by comprising the following steps:
the wastewater sequentially flows through an anaerobic tank, an anoxic tank and an MBBR reaction tank, and a biomembrane stabilizing preparation is added into the MBBR reaction tank, wherein the biomembrane stabilizing preparation comprises the following components in percentage by weight:
75-90% of population stabilizer
10-25% of coating agent;
the population stabilizer is a mixture of ammonium chloride and 5, 10-methylene-tetrahydrofuran or a mixture of ammonium sulfate and 5, 10-methylene-tetrahydrofuran, and the weight percentage ratio is as follows:
50-70% of ammonium sulfate or ammonium chloride
30-50% of 5, 10-methylene-tetrahydrofuran.
5. The method according to claim 4, wherein the biofilm stabilizing agent is periodically added every 5 to 10 days, and the total amount of the added biofilm stabilizing agent is 80 to 100 mg/L.
6. The method according to claim 5, wherein the biofilm stabilizing agent is periodically added every 7 to 10 days, and the total adding amount is 90 to 100 mg/L.
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| CN104692522A (en) * | 2015-02-13 | 2015-06-10 | 中南大学 | Composite chemical for degrading pollutant benzoquinone in wastewater and method for degrading pollutant benzoquinone in wastewater |
| CN107285477A (en) * | 2017-06-12 | 2017-10-24 | 浙江工商大学 | One kind accelerates Gram-negative electricity production bacterium anode biofilm efficiency preparation and application in microbiological fuel cell |
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