CN107337328B - Method and reactor for breaking sludge by injecting alkali liquor back in cooperation with ultrasonic waves - Google Patents
Method and reactor for breaking sludge by injecting alkali liquor back in cooperation with ultrasonic waves Download PDFInfo
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- CN107337328B CN107337328B CN201710637421.9A CN201710637421A CN107337328B CN 107337328 B CN107337328 B CN 107337328B CN 201710637421 A CN201710637421 A CN 201710637421A CN 107337328 B CN107337328 B CN 107337328B
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- 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention provides a method for decomposing sludge by injecting alkali liquor back in cooperation with ultrasonic waves. The method for decomposing the sludge by the cooperation of the reinjection alkali liquor and the ultrasonic waves comprises the following steps. Compared with the prior art, the waste alkali liquor and the residual sludge are mixed according to the volume ratio of 1: 20, the peristaltic pump sequentially and continuously enters the ultrasonic disintegration reactor and the anaerobic digestion reactor for reaction, and finally the sludge treated by the peristaltic pump is pumped out for treatment and reuse. The method for breaking sludge by using reinjection alkali liquor and ultrasonic waves provided by the invention has the advantages that the waste alkali liquor and the ultrasonic waves act together, and simultaneously sludge flocs and sludge cells are effectively broken, so that microorganisms can effectively utilize organic matters in the sludge, the anaerobic digestion efficiency is improved, the sludge is efficiently treated, and the treatment cost is saved. The invention also provides a reactor for the method for breaking the sludge by using the reinjection alkali liquor in cooperation with the ultrasonic waves.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method and a reactor for disintegrating sludge by injecting alkali liquor back in cooperation with ultrasonic waves.
Background
Most of municipal sewage treatment plants in China adopt a biological treatment process mainly based on a traditional activated sludge method and a biofilm method, and microorganisms in activated sludge continuously consume organic substances in a colloidal and dissolved state in wastewater in the biological treatment process. Among the consumed organic materials, a part of the organic materials is oxidized to provide energy required for the life activities of the microorganisms, and another part of the organic materials is utilized by the microorganisms to synthesize new cytoplasm, thereby allowing the microorganisms to reproduce. In a biological treatment system which is operated stably, biological cell substances are newly added every day to maintain constant active biomass, and the biological cell substances are required to be used as excess sludge, so that a large amount of excess sludge is generated while sewage is treated. It is predicted that the surplus sludge produced by urban sewage treatment plants in China will reach 4300 ten thousand tons (dry sludge) in 2020.
At present, a large amount of excess sludge, also called activated sludge, is generated in the process of treating wastewater by a municipal sewage treatment plant, and a large amount of flocculant is added to reduce the water content of the excess sludge to about 80%, and then the treatment is stabilized through anaerobic digestion.
The natural alkali ore can generate a large amount of concentrated waste alkali liquor in the alkali extraction process, the alkali liquor needs to be treated to meet the policy of environmental protection, the treatment method adopts an acid-adding neutralization method to treat the natural alkali ore or the treated natural alkali ore is injected underground, the treatment cost is high, and the economic benefit and the local ecological environment safety of the natural alkali ore are seriously influenced.
Aiming at the defects of the sludge treatment process and the generation of waste alkali liquor in trona ore, the invention aims to improve the anaerobic digestion efficiency of excess sludge, save the sludge treatment and trona production cost and fully utilize the waste alkali liquor resources, and provides a method for cracking sludge by reinjection of alkali liquor and ultrasonic wave and a reactor processed by the method.
Disclosure of Invention
The invention aims to provide a method for breaking sludge by using reinjection of alkali liquor in cooperation with ultrasonic waves, which comprises the following steps:
1) mixing the waste reinjection alkali liquor and the excess sludge according to the volume ratio of 1: 20, adjusting the pH value to 11, and then inoculating anaerobic seed sludge to obtain anaerobic digested sludge, wherein the amount of the anaerobic seed sludge is 10% of the amount of the anaerobic digested sludge;
2) continuously pumping anaerobic digested sludge into an ultrasonic cracking reactor through a peristaltic pump for reaction, and completing the process of the synergistic effect of the ultrasonic and the alkali; the density of ultrasonic energy is 0.13w/mL, and the time for ultrasonically treating the sludge is 15 minutes;
3) continuously pumping the anaerobic digestion sludge treated by the ultrasonic reaction in the step 2 into an anaerobic digestion reactor at 37 ℃ by a peristaltic pump; the reaction stirring speed of the peristaltic pump in the anaerobic digestion reactor is 100rpm, and the reaction time, namely the sludge retention time, is 15 days; in the anaerobic digestion process, the adenosine triphosphate content reaches 5.5 mu g/L, the methane bacteria content in the sludge is 6.8 multiplied by 109 cells/mL of sludge, and the acetic acid production amount is more than 60 percent of the short chain fatty acid content;
4) and (4) pumping out the sludge in the anaerobic digestion reactor treated in the step (3) after being treated by a peristaltic pump, and treating and recycling the sludge.
The invention also provides a reactor for the method for breaking sludge by using the reinjection alkali liquor in cooperation with the ultrasonic waves, which comprises a waste alkali liquor tank and a sludge breaking tank, wherein the waste alkali liquor tank is used for adjusting the alkalinity of the sludge; the excess sludge storage tank is used for storing excess sludge of the urban sewage treatment plant; the ultrasonic cracking reactor is used for carrying out ultrasonic cracking on the excess sludge after alkali regulation; the anaerobic digestion reactor is used for treating excess sludge subjected to alkali and ultrasonic synergistic treatment; and the sludge utilization storage tank is used for storing the treated sludge to be utilized.
Preferably, the control cracking condition of the ultrasonic cracking reactor is that the sludge is treated by ultrasonic for 15min under the ultrasonic energy density of pH 11.0 and 0.13 w/mL.
Preferably, the temperature in the anaerobic digestion reactor is controlled to be 37 ℃, and the sludge retention time is 15 days.
Compared with the related technology, the method for breaking sludge by the cooperation of the reinjection alkali liquor and the ultrasonic waves provided by the invention has the advantages that the waste alkali liquor and the ultrasonic waves act together, and simultaneously, sludge flocs and sludge cells are effectively broken, so that microorganisms can effectively utilize organic matters in the sludge, particularly, the yield of short-chain fatty acids and acetic acid is greatly improved, the adenosine triphosphate content of the sludge is improved, the adenosine triphosphate content reaches 5.5 mu g/L, and the methane bacteria content in the sludge is 6.8 multiplied by 109The cell number/mL of the sludge (measuring method: an automatic fluorescence microscope, Leica microscope LeicaM205FA), the biogas yield is 2.9 times of that of a control group, the anaerobic digestion efficiency is improved, the sludge is efficiently treated, the treatment cost is saved, the waste alkali liquor resource is fully utilized, and the pollution problem of residual pollution can be effectively solved. The invention also provides a reactor for the method for breaking the sludge by using the reinjection alkali liquor in cooperation with the ultrasonic waves.
Drawings
FIG. 1 is a block diagram of a method for decomposing sludge by injecting alkali liquor back in cooperation with ultrasonic waves.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
FIG. 1 is a block diagram of a method for decomposing sludge by injecting alkaline solution back in cooperation with ultrasonic waves according to the present invention. The method for decomposing the sludge by the cooperation of the reinjection alkali liquor and the ultrasonic waves comprises the following steps:
1) mixing the waste reinjection alkali liquor and the excess sludge according to the volume ratio of 1: 20, adjusting the pH value to 11, and then inoculating anaerobic seed sludge to obtain anaerobic digested sludge, wherein the amount of the anaerobic seed sludge is 10% of the amount of the anaerobic digested sludge;
2) continuously pumping anaerobic digested sludge into an ultrasonic cracking reactor through a peristaltic pump for reaction, and completing the process of the synergistic effect of the ultrasonic and the alkali; the density of ultrasonic energy is 0.13w/mL, and the time for ultrasonically treating the sludge is 15 minutes;
3) continuously pumping the anaerobic digestion sludge treated by the ultrasonic reaction in the step 2 into an anaerobic digestion reactor at 37 ℃ by a peristaltic pump; the reaction stirring speed of the peristaltic pump in the anaerobic digestion reactor is 100rpm, and the reaction time, namely the sludge retention time, is 15 days; the content of Adenosine Triphosphate (ATP) in anaerobic digestion process reaches 5.5 mug/L, and the content of methane bacteria in anaerobic digestion sludge is 6.8 multiplied by 109The amount of acetic acid produced per mL of sludge (measurement method: Leica M205FA, Leica microscope, auto fluorescence microscope) was 60% or more based on the content of short-chain fatty acids. The high content of Adenosine Triphosphate (ATP) means that the microbial activity in the anaerobic digestion process is high, the organic matter degradation is more thorough, the generation speed of partial volatile acid is high, particularly, the yields of Short Chain Fatty Acids (SCFAs) and acetic acid and propionic acid are greatly improved, the content of the Adenosine Triphosphate (ATP) in sludge is improved, the yield of the acetic acid is that the gas production rate of the Short Chain Fatty acid content is improved to more than 60%, the waste alkali liquor resource is fully utilized, and the system operation is more stable.
And (3) comparing data: ordinary excess sludge (untreated by the present invention)Excess sludge) is anaerobically digested, the content of adenosine triphosphate in the sludge reaches 1.9 mu g/L, and the content of methane bacteria in the sludge is 5.4 multiplied by 107The amount of acetic acid produced per mL of sludge (measurement method: Leica M205FA, Leica microscope, auto fluorescence microscope) was 32% or more of the content of short-chain fatty acids.
4) And (4) pumping out the sludge in the anaerobic digestion reactor treated in the step (3) after being treated by a peristaltic pump, and treating and recycling the sludge.
The protein and polysaccharide dissolved out from the treated excess sludge are 10-12 times of the protein and polysaccharide dissolved out from the excess sludge under the untreated condition.
The invention also provides a reactor for the method for breaking sludge by using reinjection of alkali liquor in cooperation with ultrasonic waves,
comprises a waste alkali liquor tank for adjusting the alkalinity of the sludge, and the capacity of the waste alkali liquor tank is 50L.
And the excess sludge storage tank is used for storing excess sludge of the municipal sewage treatment plant, and the capacity of the excess sludge storage tank is 50L.
The ultrasonic cracking reactor has a capacity of 10L, is a JOYN-2000D closed reactor, has adjustable power of 50-1000W and working frequency of 22 +/-1 KHz, has an additional stirring function and a mixing and stirring speed of 100 rpm. The ultrasonic cracking method is used for performing ultrasonic cracking on the excess sludge after alkali adjustment. The control cracking conditions of the ultrasonic cracking reactor are as follows: ultrasonically treating the sludge for 15min under the ultrasonic energy density of pH 11.0 and 0.13w/mL to create conditions for the next anaerobic digestion; the ultrasonic energy calculation is obtained by calculating the sludge entering the peristaltic pump in unit time and the ultrasonic power released by the ultrasonic reactor in unit time.
The anaerobic digestion reactor has the capacity of 10L, and is used for continuous anaerobic fermentation with the temperature control, gas collection, mixing and stirring speed of 100 rpm. The method is used for treating the excess sludge after the synergistic treatment of alkali and ultrasonic waves, the temperature is controlled to be 37 ℃, and the sludge retention time is 15 days.
The sludge utilization storage tank has the capacity of 50L and is used for storing the treated sludge to be utilized.
The solid content TS% of the excess sludge for the experiment is 2-3%.
The anaerobic digestion technique of the original excess sludgeCompared with the prior art, the method for breaking sludge by using reinjection alkali liquor and ultrasonic waves provided by the invention has the advantages that the waste alkali liquor and the ultrasonic waves act together, and simultaneously, sludge flocs and sludge cells are effectively broken, so that microorganisms can effectively utilize organic matters in the sludge, particularly, the yield of short-chain fatty acids and acetic acid is greatly improved, the adenosine triphosphate content of the sludge is increased, the adenosine triphosphate content reaches 5.5 mu g/L, and the content of methane bacteria in anaerobic digested sludge is 6.8 multiplied by 109The number of cells per mL of sludge and the biogas production rate are 2.9 times of those of a control group, so that the anaerobic digestion efficiency is improved, the sludge is efficiently treated, the treatment cost is saved, the waste alkali liquor resource is fully utilized, and the pollution problem of residual pollution can be effectively solved. The invention also provides a reactor for the method for breaking the sludge by using the reinjection alkali liquor in cooperation with the ultrasonic waves.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (1)
1. A method for decomposing sludge by using reinjection of alkali liquor in cooperation with ultrasonic waves is characterized by comprising the following steps of:
1) mixing the waste reinjection alkali liquor and the excess sludge according to the volume ratio of 1: 20, adjusting the pH value to 11, and then inoculating anaerobic seed sludge to obtain anaerobic digested sludge, wherein the amount of the anaerobic seed sludge is 10% of the amount of the anaerobic digested sludge;
2) continuously pumping anaerobic digested sludge into an ultrasonic cracking reactor through a peristaltic pump for reaction, and completing the process of the synergistic effect of the ultrasonic and the alkali; the density of ultrasonic energy is 0.13w/mL, and the time for ultrasonically treating the sludge is 15 minutes;
3) continuously pumping the anaerobic digestion sludge treated by the ultrasonic reaction in the step 2 into an anaerobic digestion reactor at 37 ℃ by a peristaltic pump; the reaction stirring speed of the peristaltic pump in the anaerobic digestion reactor is 100rpm, and the reaction time, namely the sludge retention time, is 15 days; the content of adenosine triphosphate in the anaerobic digestion process reaches 5.5 mu g/L, and the content of the adenosine triphosphate in sludge isThe content of methane bacteria is 6.8 multiplied by 109The number of cells per mL of sludge, and the generation amount of acetic acid is more than 60 percent of the content of short-chain fatty acid;
4) and (4) pumping out the sludge in the anaerobic digestion reactor treated in the step (3) after being treated by a peristaltic pump, and treating and recycling the sludge.
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| CN113501640A (en) * | 2021-08-18 | 2021-10-15 | 中冶生态环保集团有限公司 | Alkali and ultrasonic combined sludge pretreatment device and treatment method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0299200A (en) * | 1988-10-06 | 1990-04-11 | Fujita Corp | Anaerobic sludge digestion |
| JPH02211298A (en) * | 1988-09-16 | 1990-08-22 | Fujita Corp | Anaerobic digestion of sludge |
| CN103708696A (en) * | 2013-12-20 | 2014-04-09 | 华南理工大学 | Method for fast producing methane by utilizing excess sludge |
| CN105330114A (en) * | 2015-10-22 | 2016-02-17 | 天津大学 | Pretreatment method of promoting anaerobic fermentation of high-density sludge through alkaline-hydrolysis coupling ultrasonic processing |
| CN106145579A (en) * | 2016-08-05 | 2016-11-23 | 华东理工大学 | Alkaline residue and excess sludge coupled rotational flow release carbon method and device |
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- 2017-07-24 CN CN201710637421.9A patent/CN107337328B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02211298A (en) * | 1988-09-16 | 1990-08-22 | Fujita Corp | Anaerobic digestion of sludge |
| JPH0299200A (en) * | 1988-10-06 | 1990-04-11 | Fujita Corp | Anaerobic sludge digestion |
| CN103708696A (en) * | 2013-12-20 | 2014-04-09 | 华南理工大学 | Method for fast producing methane by utilizing excess sludge |
| CN105330114A (en) * | 2015-10-22 | 2016-02-17 | 天津大学 | Pretreatment method of promoting anaerobic fermentation of high-density sludge through alkaline-hydrolysis coupling ultrasonic processing |
| CN106145579A (en) * | 2016-08-05 | 2016-11-23 | 华东理工大学 | Alkaline residue and excess sludge coupled rotational flow release carbon method and device |
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