CN108439744B - Sludge reduction method combining microwave, biological enzyme and microorganism - Google Patents
Sludge reduction method combining microwave, biological enzyme and microorganism Download PDFInfo
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- CN108439744B CN108439744B CN201810510287.0A CN201810510287A CN108439744B CN 108439744 B CN108439744 B CN 108439744B CN 201810510287 A CN201810510287 A CN 201810510287A CN 108439744 B CN108439744 B CN 108439744B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
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Abstract
The invention provides a sludge reduction method by combining microwaves, biological enzymes and microorganisms, which comprises the following steps: pretreating sludge with organic matrix content of more than 45% in a microwave pretreatment tank for 15-35 min; mixing the lysozyme and the sludge subjected to microwave pretreatment in a mass ratio of 1:1500 to obtain a lysozyme-sludge mixed solution in a reaction tank; the method comprises the steps of mixing lysozyme and sludge mixed liquor with a composite strain, decomposing an organic substrate in sludge to generate available energy, and reducing sludge, wherein the composite strain is streptococcus digestions, veillonella bacteria, propionibacterium, fire source methanococcus lactis, methanosarcina pasteurianus, extreme thermophilic archaea and anaerobic ammonium oxidation bacteria. The invention adopts microwave, specific enzyme and microorganism to thoroughly reduce the organic substrate sludge generated by a biochemical system, and converts the sludge into usable energy by the technology; the biochemical sludge produced in the municipal sewage and industrial wastewater treatment process has ideal reduction effect.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a sludge reduction method by combining microwaves, biological enzymes and microorganisms.
Background
Generally, a sewage treatment plant can treat 1 thousand tons of domestic sewage to generate 5 to 8 tons of sludge with the water content of 80 percent, and treat 1 thousand tons of industrial sewage to generate 10 to 30 tons of sludge. Calculated according to the unit output of 7 tons and 20 tons respectively, the domestic sludge production in China town is 4382 ten thousand tons in 2020, and the industrial sludge production is 4000 ten thousand tons, which is 8382 ten thousand tons in total. Contrary to the continuous increasing trend of sludge yield, the harmless treatment rate of sludge in China is still low, a large number of sewage plants adopt direct dumping or simple landfill disposal to treat sludge, and the data of the research institute of E20 shows that the average value of the harmless treatment rates of wet sludge in various regions throughout the country in 2015 is 32%.
Data show that the sludge treatment modes in China mainly comprise modes of landfill, composting, natural drying, incineration and the like, and the ratios of the four treatment methods are 65%, 15%, 6% and 3% respectively. It can be seen that the sludge treatment mode in China is still mainly landfill, and in addition, the treatment capacity of the sewage treatment enterprises in cities and towns in China is insufficient, the treatment means is backward, a large amount of sludge is not treated in a standardized way, so that secondary pollution is directly caused, and the ecological environment is seriously threatened.
At present, most domestic and even foreign sludge treatment only stays in the technology of how to dry or how to bury the sludge, and the technical problems of low sludge reduction efficiency, easy pollution, high operation cost and high investment exist.
Disclosure of Invention
The invention provides a sludge reduction method combining microwaves, biological enzymes and microorganisms, aiming at the condition that most of sludge generated in the sewage treatment process contains a large amount of organic substrates, the organic substrates in the sludge are reduced by adopting the methods of magnetic waves, biological enzymes and microorganisms, and a large amount of energy gas methane is generated, so that the sludge reduction is really realized, the problems of sludge reduction efficiency, high operation cost and high investment are solved by the technology, the harmless and environment-friendly treatment technical revolution of the sludge is really realized, and an efficient physical cell wall breaking technology is provided for the sludge before biodegradation; selecting high-efficiency biological enzyme and microorganism fermentation strain aiming at biochemical sludge containing organic matrix; the technical problems of efficiency and investment cost in the sludge reduction process are solved.
In order to achieve the above object, the present invention provides a method for sludge reduction using a combination of microwave, bio-enzyme and microorganism, the method comprising:
firstly, in a microwave pretreatment tank, pretreating sludge with the organic matrix content of more than 45 percent for 15-35 min by microwaves with the frequency of 107.5GHz and the wavelength of 219.7 mm, and destroying microbial cells by the pretreated sludge;
step two, mixing lysozyme and the sludge subjected to microwave pretreatment in a mass ratio of 1:1500, controlling the temperature in a reaction tank to be 25-45 ℃ and the pH to be 6-9, and mixing and stirring for 25 minutes to obtain a lysozyme and sludge mixed solution;
and step three, after mixing the lysozyme and sludge mixed solution with a composite strain, decomposing the organic substrate in the sludge to generate available energy and reduce the sludge, wherein the composite strain is streptococcus pyogenes (peptostreptococcus), veillonella (veillonella), propionibacterium (propionibacterium), methanococcus lactis (lactobacillus), methanosarcina pasteurianum, archaea thermophilus and anaerobic ammonia oxidizing bacteria.
In the first step, the content of the organic matrix in the sludge accounts for less than 55 percent of the total dry weight, and the sludge is treated for 15-25min by microwave; the content of organic matrix in the sludge is more than 55% of the total dry weight, and the sludge is treated by microwave for 25-35 min.
In the first step, the water content of the sludge is 95-98%, and dehydration is not needed.
Further, after the mixed liquor of lysozyme and sludge is mixed with the composite bacterial strain, the pH value of the mixed liquor is controlled to be 7-9, the temperature is controlled to be 35-40 ℃, and the stirring frequency is 10-15 turns per minute.
Further, the mass ratio of the lysozyme-sludge mixed liquor to the composite bacterial strain is as follows:
mixed liquor of lysozyme and sludge: streptococcus digestus (peptostreptococcus): veillonella (veillonella): propionibacterium (propionibacterium): fire source methanococcus lactis (lactobacillus): methanosarcina pasteurii: thermophilic archaea: anammox bacteria, 1000:0.02:0.015:0.01:0.03:0.032: 0.045.
Further, the available energy source is biogas.
Compared with the prior art, the sludge reduction method combining microwave, biological enzyme and microorganism provided by the invention thoroughly reduces the organic substrate sludge generated by a biochemical system by adopting microwave, specific enzyme and microorganism, and converts the sludge into available energy (biogas) by the technology; the technology has ideal reduction effect on the biochemical sludge produced in the municipal sewage and industrial wastewater treatment process, and provides an efficient physical cell wall breaking technology before the sludge is biodegraded; selecting high-efficiency biological enzyme and microorganism fermentation strain aiming at biochemical sludge containing organic matrix; the problems of efficiency and investment cost in the sludge reduction process are solved.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of a sludge reduction method using microwave in combination with bio-enzyme and microorganism according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
Examples
As shown in figure 1, the first embodiment of the invention provides a sludge reduction method by combining microwaves, biological enzymes and microorganisms, and the sludge reduction method comprises three parts, namely a microwave pretreatment part, a lysozyme reaction tank and a microorganism anaerobic reduction tank. The pretreatment part comprises a microwave pretreatment tank, a fully mixed part of lysozyme and sludge in the middle, and a third part for decomposing organic matters by utilizing compound anaerobic microorganisms. The method comprises the following steps:
firstly, in a microwave pretreatment tank, pretreating sludge with the organic matrix content of more than 45 percent for 15-35 min by microwaves with the frequency of 107.5GHz and the wavelength of 219.7 mm, and destroying microbial cells by the pretreated sludge;
step two, mixing lysozyme and the sludge subjected to microwave pretreatment in a mass ratio of 1:1500, controlling the temperature in a reaction tank to be 25-45 ℃ and the pH to be 6-9, and mixing and stirring for 25 minutes to obtain a lysozyme and sludge mixed solution;
and step three, after the mixed solution of lysozyme and sludge is mixed with the composite bacterial strain, decomposing the organic substrate in the sludge to generate usable energy, so that the sludge is reduced.
The compound bacterial strain is streptococcus digestions (peptostreptococcus), veillonella (veillonella), propionibacterium (propionibacterium), methanococcus fireorigin (lactobacillus), methanosarcina pasteurianus, archaea extreme thermophilus and anammox bacteria.
In the first step, the content of the organic matrix in the sludge accounts for less than 55 percent of the total dry weight, and the sludge is treated for 15-25min by microwave; the content of organic matrix in the sludge is more than 55% of the total dry weight, and the sludge is treated by microwave for 25-35 min.
In the first step, the water content of the sludge is 95-98%, and dehydration is not needed.
The method comprises the steps of firstly analyzing target sludge, and only after confirming that the content of organic matters such as the content of organic substrates of the sludge accounts for more than 45%, the sludge before reduction can be reduced and reduced by adopting the technology, and the water content of the sludge is 95-98% without dehydration.
Further, after the mixed liquor of lysozyme and sludge is mixed with the composite bacterial strain, the pH value of the mixed liquor is controlled to be 7-9, the temperature is controlled to be 35-40 ℃, and the stirring frequency is 10-15 turns per minute.
Further, the mass ratio of the lysozyme-sludge mixed liquor to the composite bacterial strain is as follows:
mixed liquor of lysozyme and sludge: streptococcus digestus (peptostreptococcus): veillonella (veillonella): propionibacterium (propionibacterium): fire source methanococcus lactis (lactobacillus): methanosarcina pasteurii: thermophilic archaea: anammox bacteria, 1000:0.02:0.015:0.01:0.03:0.032: 0.045.
Further, the available energy source is biogas.
The reduction ratio of the sludge in the invention and the prior art is shown in table 1:
TABLE 1
| This application | Conventional techniques |
| The sludge is reduced by 50 percent or more | Only reduce the water content of the sludge |
| The hardware investment is low | Large investment of hardware |
| The operation cost is 55 yuan/ton mud | The cost of per ton of mud is more than 300 yuan |
| Low energy consumption | High energy consumption |
The sludge reduction technology combining the microwaves, the enzymes and the microorganisms can reduce the residual sludge generated by a biochemical system, and can simultaneously realize the utilization of the waste sludge as energy:
the technology of the invention is suitable for treating the sludge generated by municipal and industrial sewage treatment plants.
Compared with the prior art, the sludge reduction method combining microwave, biological enzyme and microorganism provided by the invention thoroughly reduces the organic substrate sludge generated by a biochemical system by adopting microwave, specific enzyme and microorganism, and converts the sludge into available energy (biogas) by the technology; the technology has ideal reduction effect on the biochemical sludge produced in the municipal sewage and industrial wastewater treatment process, and provides an efficient physical cell wall breaking technology before the sludge is biodegraded; selecting high-efficiency biological enzyme and microorganism fermentation strain aiming at biochemical sludge containing organic matrix; the problems of efficiency and investment cost in the sludge reduction process are solved.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (4)
1. A sludge reduction method combining microwave, biological enzyme and microorganism is characterized by comprising the following steps:
firstly, in a microwave pretreatment tank, pretreating sludge with the organic matrix content of more than 45 percent for 15-35 min by microwaves with the frequency of 107.5GHz and the wavelength of 219.7 mm, and destroying microbial cells by the pretreated sludge;
step two, mixing lysozyme and the sludge subjected to microwave pretreatment in a mass ratio of 1:1500, controlling the temperature in a reaction tank to be 25-45 ℃ and the pH to be 6-9, and mixing and stirring for 25 minutes to obtain a lysozyme and sludge mixed solution;
step three, after mixing the lysozyme and sludge mixed solution with a composite strain, decomposing an organic substrate in the sludge to generate available energy and reduce the sludge, wherein the composite strain is streptococcus pyogenes (peptostreptococcus), veillonella (veillonella), propionibacterium (propionibacterium), methanococcus lactis (lactobacillus), methanosarcina pasteurianum, archaea extreme thermophilus and anaerobic ammonia oxidizing bacteria;
mixing the lysozyme and sludge mixed liquor with the composite strain, and then controlling the pH value of the mixture to be 7-9, the temperature to be 35-40 ℃ and the stirring frequency to be 10-15 revolutions per minute in a reduction tank; the mass ratio of the lysozyme-sludge mixed liquor to the composite strain is as follows: mixed liquor of lysozyme and sludge: streptococcus digestus (peptostreptococcus): veillonella (veillonella): propionibacterium (propionibacterium): fire source methanococcus lactis (lactobacillus): methanosarcina pasteurii: thermophilic archaea: anammox bacteria, 1000:0.02:0.015:0.01:0.03:0.032: 0.045.
2. The method of claim 1, wherein in step one, the content of the organic substrate in the sludge is less than 55% of the total dry weight, and the microwave treatment is carried out for 15-25 min; the content of organic matrix in the sludge is more than 55% of the total dry weight, and the sludge is treated by microwave for 25-35 min.
3. The method of claim 1 or 2, wherein in step one, the water content of the sludge is between 95% and 98%, and dehydration is not required.
4. The method of claim 1, wherein the available energy source is biogas.
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| CN110563289A (en) * | 2019-09-09 | 2019-12-13 | 湖南鑫恒环境科技有限公司 | Method for treating sludge by combining microwaves and microbial agents |
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| CN106007313A (en) * | 2016-07-28 | 2016-10-12 | 北京赛富威环境工程技术有限公司 | Graded reduction treatment method of sludge |
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