CN112390487A - Method for strengthening kitchen waste and sludge cooperative anaerobic digestion through ultrasonic pretreatment - Google Patents
Method for strengthening kitchen waste and sludge cooperative anaerobic digestion through ultrasonic pretreatment Download PDFInfo
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- CN112390487A CN112390487A CN202011176021.0A CN202011176021A CN112390487A CN 112390487 A CN112390487 A CN 112390487A CN 202011176021 A CN202011176021 A CN 202011176021A CN 112390487 A CN112390487 A CN 112390487A
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- 239000010806 kitchen waste Substances 0.000 title claims abstract description 71
- 230000029087 digestion Effects 0.000 title claims abstract description 42
- 239000010802 sludge Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005728 strengthening Methods 0.000 title claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 12
- 238000000855 fermentation Methods 0.000 claims abstract description 8
- 230000004151 fermentation Effects 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 230000002195 synergetic effect Effects 0.000 claims abstract description 6
- 230000003203 everyday effect Effects 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000002604 ultrasonography Methods 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 11
- 239000000126 substance Substances 0.000 abstract description 8
- 235000015097 nutrients Nutrition 0.000 abstract description 5
- 238000004090 dissolution Methods 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 230000002354 daily effect Effects 0.000 description 6
- 238000009210 therapy by ultrasound Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for strengthening the synergetic anaerobic digestion of kitchen waste and sludge through ultrasonic pretreatment. The method comprises the following steps: and (4) pretreating the kitchen waste by ultrasonic after uniformly stirring. Mixing the pretreated kitchen waste with municipal sludge, placing the mixture in a fermentation tank, and carrying out anaerobic digestion at 50-60 ℃. After anaerobic digestion is carried out for 5-6 days, the kitchen waste and the municipal sludge after pretreatment are added according to the dosing rate of 12% of the volume of the fermentation tank every day, and the anaerobic digestion is continuously carried out at the temperature of 50-60 ℃. According to the invention, the kitchen waste is pretreated by ultrasonic waves, so that the particle size of the kitchen waste particles can be reduced, the dissolution of organic matters is accelerated, and the anaerobic digestion efficiency is greatly improved. The invention can reuse the residual nutrient substances in the kitchen waste, adjust the nutrient proportion of the kitchen waste and the municipal sludge, and effectively solve the problems in the process of separately digesting two organic solid wastes.
Description
Technical Field
The invention relates to the technical field of solid waste treatment, in particular to a method for strengthening the synergetic anaerobic digestion of kitchen waste and sludge through ultrasonic pretreatment.
Background
The catering industry in China develops rapidly, a large number of employment population and economic rapid growth are brought to China, meanwhile, a large number of kitchen waste needing to be treated is generated, the amount of kitchen waste water discharged without qualified treatment in China reaches hundreds of millions of tons every year, and the numerical value is also increasing at a high speed. The kitchen waste has the dual properties of typical harm and resources, generally presents a solid-liquid mixed state and mainly consists of a large amount of organic matters and trace elements. At present, the degree of kitchen waste resource utilization in China is low, most areas do not have complete kitchen waste harmless treatment and resource utilization management systems, established resource facilities cannot run at full load, and a collection system cannot run well. The method lacks a novel treatment technology with thorough harmless degree and high resource utilization degree, and can not realize harmless digestion and resource recycling of the kitchen waste.
Meanwhile, with the continuous improvement of the domestic water consumption of people, the number of sewage treatment plants in China is increased, and the output of municipal sludge is also increased continuously. The municipal sludge has high water content and low organic matter content, contains toxic and harmful substances such as heavy metal, germs and the like, and has more prominent problems in treatment and disposal. Anaerobic digestion refers to the degradation and conversion of complex insoluble macromolecular organic matters into simple and stable micromolecular substances under the condition of oxygen deficiency or anaerobic state through the synergistic action of various anaerobic bacteria. Anaerobic digestion is widely used in the treatment of kitchen waste or municipal sludge, but the gas production rate is low and the system operation is unstable in the digestion process.
Disclosure of Invention
In order to solve the problems of low gas yield, unstable system operation and the like when the kitchen waste and the municipal sludge are subjected to the independent anaerobic digestion, the invention aims to provide a method for strengthening the synergetic anaerobic digestion of the kitchen waste and the sludge through ultrasonic pretreatment. The method can reuse the residual nutrient substances in the kitchen waste, adjust the nutrient proportion of the kitchen waste and the municipal sludge, and effectively solve the problems in the process of separately digesting two organic solid wastes.
The technical scheme adopted for realizing the purpose of the invention is as follows: a method for strengthening the synergetic anaerobic digestion of kitchen waste and sludge through ultrasonic pretreatment comprises the following steps:
1) and (3) uniformly stirring the kitchen waste and then carrying out pretreatment by ultrasonic.
2) Mixing the pretreated kitchen waste with municipal sludge, placing the mixture in a fermentation tank, and carrying out anaerobic digestion at 50-60 ℃.
3) After anaerobic digestion is carried out for 5-6 days, the kitchen waste and the municipal sludge after pretreatment are added according to the dosing rate of 12% of the volume of the fermentation tank every day, and the anaerobic digestion is continuously carried out at the temperature of 50-60 ℃.
Further, in the method, in the step 1), the water content of the kitchen waste is 80-90%.
Further, in the above method, step 1), the ultrasound treatment is performed for 15min under the ultrasound energy density of 1.5W/mL.
Further, in the method, in the step 2), the water content of the municipal sludge is 80-90%.
Further, in the method, step 2), the kitchen waste and the municipal sludge are mixed according to the mass ratio of 1: 1.
Further, in the method, in the step 3), the kitchen waste and the municipal sludge are added according to the mass ratio of 1: 1.
Further, in the method, the stirring is carried out for 20-30 minutes every 20 minutes in the anaerobic digestion process.
The invention has the beneficial effects that: in the invention, the ultrasonic pretreatment can change the physical and chemical properties of the acting substances, effectively destroy the substance structure, reduce the particle size of substrate particles, accelerate the dissolution of organic matters and improve the anaerobic digestion efficiency. The invention can effectively treat two common organic solid wastes of kitchen waste and municipal sludge at the same time.
Drawings
FIG. 1 shows the influence of different proportions of kitchen waste and municipal sludge on the daily gas production of anaerobic digestion in the method of the present invention.
FIG. 2 shows the influence of different proportions of kitchen waste and municipal sludge on the methane content in the produced gas in the method of the present invention.
FIG. 3 is the effect of the ultrasonic pretreatment time on the average particle size of the kitchen waste in the method of the present invention.
FIG. 4 is a graph of the effect of ultrasonic acoustic energy density on SCOD increase over time in the method of the present invention.
Detailed Description
The invention is further described below with reference to specific examples.
Example 1
Influence of different proportions of kitchen waste and municipal sludge on anaerobic digestion daily gas production
The method comprises the following steps:
1) adjusting the water content of the kitchen waste to 90%; adjusting the water content of the municipal sludge to 90%;
2) uniformly stirring the kitchen waste with the water content of 90%, and then carrying out ultrasonic treatment for 15min under the ultrasonic sound energy density of 1.5W/mL.
3) Mixing the pretreated kitchen waste and municipal sludge with the water content of 90% according to the mass ratio of 1:9, 2:8, 3:7, 4:6 and 1:1 respectively, fully stirring, then respectively placing the mixture in an anaerobic digestion tank with the effective volume of 10L, and carrying out anaerobic digestion at the temperature of 55 ℃.
4) After 5 days of anaerobic digestion, stable gas production is realized, then feeding and discharging are carried out once a day according to the dosing rate of 12% of the volume of the fermentation tank, the mixture of the kitchen waste and the municipal sludge is respectively added according to the mass ratio of 1:9, 2:8, 3:7, 4:6 and 1:1 every time, and the anaerobic digestion is continuously carried out at the temperature of 55 ℃. Stirring for 20 minutes every 20 minutes during anaerobic digestion.
FIG. 1 shows the influence of different proportions of kitchen waste and municipal sludge on the daily gas production of anaerobic digestion. As shown in figure 1, the gas production is stable after 5-6 days of anaerobic digestion, the daily gas production of the anaerobic digestion is continuously increased along with the continuous increase of the specific gravity of the kitchen waste, and the daily gas production reaches the highest when the mass ratio of the kitchen waste to the municipal sludge is 1: 1. The kitchen waste is high in hydrolysis and easy to decompose by microorganisms, and meanwhile, anaerobic bacteria have a co-metabolism effect on nutrient substances in the kitchen waste and municipal sludge, so that the gas yield of anaerobic digestion is improved.
FIG. 2 shows the influence of different proportions of kitchen waste and municipal sludge on the methane content in the produced gas. As shown in FIG. 2, the content of methane in the produced gas is increased along with the increasing of the specific gravity of the kitchen waste. Therefore, the invention preferably selects the mass ratio of the kitchen waste to the municipal sludge as 1: 1.
Example 2
Influence of ultrasonic time on average particle size of kitchen waste
The method comprises the following steps: adjusting the water content of the kitchen waste to 90%; uniformly stirring the kitchen waste with the water content of 90%, and then respectively carrying out ultrasonic treatment for 0, 5, 10, 15 and 20 minutes under the ultrasonic energy density of 1.5W/mL.
FIG. 3 is the effect of the ultrasonic pretreatment time on the average particle size of the kitchen waste. As shown in fig. 3, with the increase of the ultrasonic time, the average particle size of the kitchen waste is continuously reduced, when the ultrasonic time reaches 15min, the influence on the particle size of the kitchen waste reaches the best effect, and the influence on the average particle size of the kitchen waste is not large when the ultrasonic time is continuously increased. This is because the high temperature and high pressure generated by the ultrasound can destroy the material structure of the kitchen waste and reduce the average particle size. Therefore, the ultrasonic pretreatment time is 15 min.
Example 3
Effect of ultrasonic Acoustic energy Density on SCOD increments
The method comprises the following steps: adjusting the water content of the kitchen waste to 90%; after uniformly stirring the kitchen waste with the water content of 90%, respectively carrying out ultrasonic treatment for 5min, 10min, 15min and 20min under the conditions that the ultrasonic energy density is 0.5W/mL, 1.0W/mL, 1.5W/mL and 2.0W/mL. And (4) measuring the content of SCOD in the kitchen waste.
Figure 4 is a graph of the effect of ultrasonic acoustic energy density on SCOD increase over time. As shown in FIG. 4, as the ultrasonic sound energy density and the ultrasonic time increase, the SCOD increment of the kitchen waste also increases. After the ultrasonic time reaches 15min, the SCOD dissolution rate is obviously reduced, so the ultrasonic pretreatment time is preferably 15 min. After the ultrasonic energy density reaches 1.5W/mL, the SCOD dissolution rate is obviously reduced, and the energy utilization rate is reduced by continuously increasing the ultrasonic energy density. Therefore, the preferred ultrasonic energy density of the present invention is 1.5W/mL.
Example 4
Method for strengthening two-stage anaerobic digestion of kitchen waste and sludge through ultrasonic pretreatment
The method comprises the following steps:
1) the kitchen waste is taken from a dining hall of Liaoning university, and the water content of the kitchen waste is adjusted to 90%.
2) Taking the excess sludge of a sewage treatment plant in a certain town of Shenyang city, wherein the water content of a filter cake is 90.36%;
3) uniformly stirring the kitchen waste with the water content of 90%, and then carrying out ultrasonic treatment for 15min under the ultrasonic sound energy density of 1.5W/mL.
4) Mixing the pretreated kitchen waste and excess sludge with the water content of 90.36% according to the mass ratio of 1:1, fully stirring, then placing in an anaerobic digestion tank with the effective volume of 10L, and carrying out anaerobic digestion at the temperature of 55 ℃.
3) After 5 days of anaerobic digestion, stable gas production is realized, then feeding and discharging are carried out once a day according to the dosing rate of 12% of the volume of the fermentation tank, the mixture of the kitchen waste and the municipal sludge is added according to the mass ratio of 1:1 every time, and the anaerobic digestion is continued at 55 ℃. Stirring for 20 minutes every 20 minutes during anaerobic digestion.
After 15 days of operation, the total VS removal rate is 61%, the daily gas production can reach about 2.3L, and the methane content can reach 67.31%.
Claims (7)
1. A method for strengthening the synergetic anaerobic digestion of kitchen waste and sludge through ultrasonic pretreatment is characterized by comprising the following steps:
1) uniformly stirring the kitchen waste and then carrying out pretreatment by ultrasonic;
2) mixing the pretreated kitchen waste with municipal sludge, placing the mixture in a fermentation tank, and carrying out anaerobic digestion at 50-60 ℃;
3) after anaerobic digestion is carried out for 5-6 days, the kitchen waste and the municipal sludge after pretreatment are added according to the dosing rate of 12% of the volume of the fermentation tank every day, and the anaerobic digestion is continuously carried out at the temperature of 50-60 ℃.
2. The method according to claim 1, wherein in the step 1), the water content of the kitchen waste is 80-90%.
3. The method according to claim 1, wherein in step 1), the ultrasound is performed for 15min at an ultrasonic energy density of 1.5W/mL.
4. The method according to claim 1, wherein the water content of the municipal sludge in step 2) is 80-90%.
5. The method according to claim 1, wherein in the step 2), the kitchen waste and the municipal sludge are mixed according to the mass ratio of 1: 1.
6. The method according to claim 1, wherein in the step 3), the kitchen waste and the municipal sludge are added according to the mass ratio of 1: 1.
7. The method of claim 1, wherein the anaerobic digestion is performed with agitation for 20-30 minutes every 20 minutes.
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| CN202011176021.0A CN112390487A (en) | 2020-10-29 | 2020-10-29 | Method for strengthening kitchen waste and sludge cooperative anaerobic digestion through ultrasonic pretreatment |
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| CN202011176021.0A CN112390487A (en) | 2020-10-29 | 2020-10-29 | Method for strengthening kitchen waste and sludge cooperative anaerobic digestion through ultrasonic pretreatment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114107406A (en) * | 2021-11-08 | 2022-03-01 | 北京工业大学 | Method for strengthening acid production by co-digestion of kitchen waste and activated sludge through ultrasonic/temperature pretreatment |
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|---|---|---|---|---|
| CN102030456A (en) * | 2010-11-09 | 2011-04-27 | 同济大学 | Method for enhancing dry-process fermentation stability of sludge by adding kitchen waste |
| CN102557373A (en) * | 2011-08-01 | 2012-07-11 | 佛山市水业集团有限公司 | Treatment method of excess sludge |
| CN103923951A (en) * | 2014-05-05 | 2014-07-16 | 哈尔滨工业大学 | Method for producing acid by enhancing anaerobic fermentation of kitchen waste through ultrasonic/acid pretreatment |
| CN104388479A (en) * | 2014-11-21 | 2015-03-04 | 哈尔滨工业大学 | Method for producing short chain fatty acid by strengthening anaerobic fermentation of kitchen garbage |
-
2020
- 2020-10-29 CN CN202011176021.0A patent/CN112390487A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030456A (en) * | 2010-11-09 | 2011-04-27 | 同济大学 | Method for enhancing dry-process fermentation stability of sludge by adding kitchen waste |
| CN102557373A (en) * | 2011-08-01 | 2012-07-11 | 佛山市水业集团有限公司 | Treatment method of excess sludge |
| CN103923951A (en) * | 2014-05-05 | 2014-07-16 | 哈尔滨工业大学 | Method for producing acid by enhancing anaerobic fermentation of kitchen waste through ultrasonic/acid pretreatment |
| CN104388479A (en) * | 2014-11-21 | 2015-03-04 | 哈尔滨工业大学 | Method for producing short chain fatty acid by strengthening anaerobic fermentation of kitchen garbage |
Non-Patent Citations (2)
| Title |
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| 唐朝春等: "餐厨垃圾联合厌氧消化研究进展", 《现代化工》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114107406A (en) * | 2021-11-08 | 2022-03-01 | 北京工业大学 | Method for strengthening acid production by co-digestion of kitchen waste and activated sludge through ultrasonic/temperature pretreatment |
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