CN102603136A - Method for producing methane through jointly opsonizing sludge by microwave and heat to improve anaerobic fermentation of low organic sludge - Google Patents
Method for producing methane through jointly opsonizing sludge by microwave and heat to improve anaerobic fermentation of low organic sludge Download PDFInfo
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- CN102603136A CN102603136A CN2012100733215A CN201210073321A CN102603136A CN 102603136 A CN102603136 A CN 102603136A CN 2012100733215 A CN2012100733215 A CN 2012100733215A CN 201210073321 A CN201210073321 A CN 201210073321A CN 102603136 A CN102603136 A CN 102603136A
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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
Abstract
The invention belongs to the technical field of the recycling of solid wastes and discloses a method for producing methane through jointly opsonizing sludge by microwave and heat to improve anaerobic fermentation of low organic sludge. The method comprises the following steps that: preparing concentrated sludge and dewatered sludge into mixed sludge, preprocessing the mixed sludge, taking the mixed sludge as a feeding material to conduct anaerobic fermentation, discharging sludge with the same volume, and collecting methane. According to the method, the anaerobic starting time of the low organic sludge is shortened, the total gas output rate caused by the anaerobic fermentation of the low organic sludge is increased, and the recycling utilization of the low organic sludge is promoted.
Description
Technical field
The invention belongs to the solid waste resource recovery technical field, relate to the method that a kind of microwave and heat integration conditioning mud improves low organic sludge anaerobic fermentation and biogas production.
Background technology
China has built large amount of sewage treatment plant, and by 2009, the whole nation had 1792 of urban wastewater treatment firms, and processing power reaches 9,904 ten thousand m3/d, and average operating load rate is 81.27%.When vital role had been played in the reduction that the construction and the operation of these sewage works are loaded to municipal pollution, by product municipal sludge amount also increased day by day in the sewage treatment process.At present, wet mud nearly 3,000 ten thousand tons (water ratio 80%) is produced in the whole nation per year, and the center that sludge treatment is disposed has turned to resource from simple landfill and turned to main soil utilization.And before mud carries out the soil utilization, need carry out stabilization treatment to mud; Reclaim a large amount of biomass energy-biogas that contains in the mud; Anaerobically fermenting is one of important measures of sludge stabilizing; Not only process institute energy requirement is lower, and biomass energy in the also recyclable mud is a kind of recycling sludge technology that application prospect is arranged very much.
One of important factor in order of the efficient of decision sludge anaerobic fermentation and biogas production is the organic content of mud; External mud belongs to high organic mud; Content is generally 70%～84%, and the effect that application anaerobically fermenting production biogas can be obtained also is applicable.And China's mud organic content is all lower, and normal the appearance starts difficulty, and gas production rate is few, and aerogenesis is unstable, has limited the sludge anaerobic fermentation technique in China's large-scale application.
Existing mud preconditioning technique only has higher effect to the mud of high organic lower concentration, and not clear and definite as yet to the treatment effect of the mud of low organic high density, its processing parameter is not optimized as yet yet.
Summary of the invention
Start difficulty to low organic mud; Gas production rate is few; And aerogenesis is unstable, is difficult to use the anaerobism stabilization process to its defective of carrying out treatment and disposal, the purpose of this invention is to provide the method that a kind of microwave and heat integration conditioning mud improves low organic sludge anaerobic fermentation and biogas production.
Technical scheme of the present invention is following:
The invention provides the method that a kind of microwave and heat integration conditioning mud improves low organic sludge anaerobic fermentation and biogas production, this method may further comprise the steps:
Thickened sludge and dewatered sludge are made into mixing sludge carry out pre-treatment, get above-mentioned mixing sludge and carry out anaerobic digestion as charging, and the mud of discharging equal volume, biogas collected.
Described mixing sludge water ratio is 85～95%, and the ratio that volatility organic solid VS accounts for total solids TS is 20～45%.
Described charging or discharging are meant inlet amount every day=every day load=digested sludge total amount/sludge retention time.
Sludge retention time is 20～30d in the described anaerobic digestion process.
It is to carry out Microwave Pretreatment earlier that described mixing sludge carries out pre-treatment, after carry out heat pre-treatment.
Described Microwave Pretreatment process conditions is: microwave frequency is 2450MHz, and microwave irradiation power is 100～1000w, and radiated time is 1～20min.
Described heat pre-treatment temperature is 90～170 ℃, and the time is 10～60min.
Described anaerobic digestion controlled temperature is 35 ± 2 ℃ or 55 ± 2 ℃, and regulating pH is 7.5 ± 0.5, and stirring velocity is 50～250rpm.
The present invention compares with prior art, has following advantage and beneficial effect:
1, the inventive method improves low organic sludge anaerobic fermentation to produce gas efficient, stablize gas production rate, and energy consumption is low, and convenient in application further promotes recycling sludge
2, the inventive method shortens low organic sludge anaerobic start time, improves low organic sludge anaerobic digestion gas production total amount, has promoted low organic recycling sludge utilization.
3, the inventive method makes that low organic mud aerogenesis is stable, and improves the mud gas production rate, has shortened sludge retention time, reduces sludge anaerobic fermentor tank volume.
4, the inventive method all can be used for different scales sewage work, only needs to increase a microwave radiation device and heating pretreatment device.
Description of drawings
Fig. 1 representes that microwave of the present invention and heat integration conditioning mud improve the schema of the method for low organic sludge anaerobic fermentation and biogas production.
Embodiment
Below in conjunction with the accompanying drawing illustrated embodiment the present invention is further described.
Embodiment 1
Fig. 1 representes that microwave of the present invention and heat integration conditioning mud improve the schema of the method for low organic sludge anaerobic fermentation and biogas production.
Getting somewhere sewage work dewatered sludge (water ratio is 78.91%) and thickened sludge (water ratio is 96.17%), in the mud preparing pool, to be made into water ratio be 90.0% mixing sludge, this moment its volatility organic solid to account for the ratio of total solids be 32.5%.Then above-mentioned mud is dropped into microwave radiation device, microwave frequency is 2450MHz, under the 1000W condition, through microwave exposure 1min, and then drops in the heating pretreatment device, through 120 degree heating 30min.Get in the fermentor tank that above-mentioned mud that 1L handled well drops into the 20L effective volume (sludge retention time is 20d), and discharging 1L is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 40～60d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 11.7L, and methane content is 63.35%, and degradation effect of organic compound is 36%.
Comparative example 1
Getting somewhere sewage work dewatered sludge (water ratio is 78.91%) and thickened sludge (water ratio is 96.17%), in the mud preparing pool, to be made into water ratio be 90.0% mixing sludge, this moment its volatility organic solid to account for the ratio of total solids be 32.5%.Get in the fermentor tank that the above-mentioned mud of 1L drops into the 20L effective volume (sludge retention time is 20d), and discharging 1L is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 40～60d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 8.2L, and methane content is 60.12%, and degradation effect of organic compound is 24%.
This shows that embodiment 1 compares comparative example 1 gas production rate and improved 42.7%, degradation effect of organic compound has increased 12%.
Embodiment 2
Getting somewhere sewage work dewatered sludge (water ratio is 79.11%) and thickened sludge (water ratio is 97.62%), in the mud preparing pool, to be made into water ratio be 85.0% mixing sludge, this moment its volatility organic solid to account for the ratio of total solids be 20.0%.Then above-mentioned mud is dropped into microwave radiation device, microwave frequency is 2450MHz, microwave exposure 10min under the 600W condition, and then drop in the heating pretreatment device, through 90 ℃ of heating 60min.Get in the fermentor tank that above-mentioned mud that 1L handled well drops into the 25L effective volume (sludge retention time is 25d), and discharging 1L is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 150rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 9.6L, and methane content is 67.28%, and degradation effect of organic compound is 32%.
Comparative example 2
Getting somewhere sewage work dewatered sludge (water ratio is 79.11%) and thickened sludge (water ratio is 97.62%), in the mud preparing pool, to be made into water ratio be 85.0% mixing sludge, this moment its volatility organic solid to account for the ratio of total solids be 20.0%.Get in the fermentor tank that the above-mentioned mud of 1L drops into the 25L effective volume (sludge retention time is 25d), and discharging 1L is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 150rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 6.0L, and methane content is 65.56%, and degradation effect of organic compound is 20.0%.
This shows that embodiment 2 compares comparative example 2 gas production rate and improved 60.0%, degradation effect of organic compound has increased 12%.
Embodiment 3
Getting somewhere sewage work dewatered sludge (water ratio is 78.11%) and thickened sludge (water ratio is 98.35%), in the mud preparing pool, to be made into water ratio be 95.0% mixing sludge, this moment its volatility organic solid to account for the ratio of total solids be 45.0%.Then above-mentioned mud is dropped in the microwave radiation device, microwave frequency is 2450MHz, under the 100W condition, through microwave exposure 20min, and then drops into hot pretreatment unit, through 170 degree heating 10min.Get in the fermentor tank that above-mentioned mud that 1L handled well drops into the 30L effective volume (sludge retention time is 30d), and discharging 1L is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 50rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 9.5L, and methane content is 69.32%, and degradation effect of organic compound is 42%.
Comparative example 3
Getting somewhere sewage work dewatered sludge (water ratio is 78.11%) and thickened sludge (water ratio is 98.35%), in the mud preparing pool, to be made into water ratio be 95.0% mixing sludge, this moment its volatility organic solid to account for the ratio of total solids be 45.0%.Get in the fermentor tank that the above-mentioned mud of 1L drops into the 30L effective volume (sludge retention time is 30d), and discharging 1L is to collecting in the mud sump.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH 7.5 ± 0.5 automatically, and rotating speed is controlled to be 50rpm.Continuously operation 2～3 cycles (promptly after 60～90d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 7.3L, and methane content is 65.32%, and degradation effect of organic compound is 29%.
This shows that embodiment 3 compares comparative example 3 gas production rate and improved 30.1%, degradation effect of organic compound has increased 13%.
The above-mentioned description to embodiment is can understand and use the present invention for ease of the those of ordinary skill of this technical field.The personnel of skilled obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not breaking away from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (8)
1. microwave and heat integration conditioning mud improves the method for low organic sludge anaerobic fermentation and biogas production, and it is characterized in that: this method may further comprise the steps:
Thickened sludge and dewatered sludge are made into mixing sludge carry out pre-treatment, get above-mentioned mixing sludge and carry out anaerobic digestion as charging, and the mud of discharging equal volume, biogas collected.
2. microwave according to claim 1 and heat integration conditioning mud improve the method for low organic sludge anaerobic fermentation and biogas production; It is characterized in that: described mixing sludge water ratio is 85～95%, and the ratio that volatility organic solid VS accounts for total solids TS is 20～45%.
3. microwave according to claim 1 and heat integration conditioning mud improves the method for low organic sludge anaerobic fermentation and biogas production, it is characterized in that: described charging or discharging are meant inlet amount every day=every day load=digested sludge total amount/sludge retention time.
4. microwave according to claim 1 and heat integration conditioning mud improve the method for low organic sludge anaerobic fermentation and biogas production, and it is characterized in that: sludge retention time is 20～30d in the described anaerobic digestion process.
5. microwave according to claim 1 and heat integration conditioning mud improves the method for low organic sludge anaerobic fermentation and biogas production, it is characterized in that: it is to carry out Microwave Pretreatment earlier that described mixing sludge carries out pre-treatment, after carry out heat pre-treatment.
6. microwave according to claim 5 and heat integration conditioning mud improve the method for low organic sludge anaerobic fermentation and biogas production; It is characterized in that: described Microwave Pretreatment process conditions is: microwave frequency is 2450MHz; Microwave irradiation power is 100～1000w, and radiated time is 1～20min.
7. microwave according to claim 5 and heat integration conditioning mud improve the method for low organic sludge anaerobic fermentation and biogas production, and it is characterized in that: described heat pre-treatment temperature is 90～170 ℃, and the time is 10～60min.
8. microwave according to claim 1 and heat integration conditioning mud improve the method for low organic sludge anaerobic fermentation and biogas production; It is characterized in that: described anaerobic digestion controlled temperature is 35 ± 2 ℃ or 55 ± 2 ℃; Regulating pH is 7.5 ± 0.5, and stirring velocity is 50～250rpm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172242A (en) * | 2013-03-04 | 2013-06-26 | 同济大学 | Method for improving methanogenesis of residual sludge by heat and alkali combined pretreatment |
| CN105836994A (en) * | 2016-05-27 | 2016-08-10 | 轻工业环境保护研究所 | Intermediate-enhanced sludge digestion process |
| CN114436484A (en) * | 2022-01-10 | 2022-05-06 | 长春工程学院 | System and method for recovering carbon, nitrogen and phosphorus resources by microwave disintegration of excess sludge assisted by wave-absorbing substances |
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| CN101524699A (en) * | 2009-04-17 | 2009-09-09 | 清华大学 | Method for improving anaerobic digestion performance of sludge by utilizing microwave alkaline thermal hydrolysis |
| CN101698561A (en) * | 2009-10-23 | 2010-04-28 | 宁波工程学院 | Silt pretreatment method for enhancing dehydration property and digestibility of silt |
| CN201620096U (en) * | 2010-01-08 | 2010-11-03 | 东北农业大学 | Mixed sludge return biogas generator |
| CN102060412A (en) * | 2010-11-10 | 2011-05-18 | 天津城市建设学院 | Device and method for improving biological dephosphorizing and denitriding efficiency of low carbon source sewage |
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2012
- 2012-03-19 CN CN2012100733215A patent/CN102603136B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101524699A (en) * | 2009-04-17 | 2009-09-09 | 清华大学 | Method for improving anaerobic digestion performance of sludge by utilizing microwave alkaline thermal hydrolysis |
| CN101698561A (en) * | 2009-10-23 | 2010-04-28 | 宁波工程学院 | Silt pretreatment method for enhancing dehydration property and digestibility of silt |
| CN201620096U (en) * | 2010-01-08 | 2010-11-03 | 东北农业大学 | Mixed sludge return biogas generator |
| CN102060412A (en) * | 2010-11-10 | 2011-05-18 | 天津城市建设学院 | Device and method for improving biological dephosphorizing and denitriding efficiency of low carbon source sewage |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172242A (en) * | 2013-03-04 | 2013-06-26 | 同济大学 | Method for improving methanogenesis of residual sludge by heat and alkali combined pretreatment |
| CN105836994A (en) * | 2016-05-27 | 2016-08-10 | 轻工业环境保护研究所 | Intermediate-enhanced sludge digestion process |
| CN105836994B (en) * | 2016-05-27 | 2021-01-26 | 轻工业环境保护研究所 | Intermediate-intensified sludge digestion process |
| CN114436484A (en) * | 2022-01-10 | 2022-05-06 | 长春工程学院 | System and method for recovering carbon, nitrogen and phosphorus resources by microwave disintegration of excess sludge assisted by wave-absorbing substances |
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