CN102603136B - 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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- CN102603136B CN102603136B CN2012100733215A CN201210073321A CN102603136B CN 102603136 B CN102603136 B CN 102603136B CN 2012100733215 A CN2012100733215 A CN 2012100733215A CN 201210073321 A CN201210073321 A CN 201210073321A CN 102603136 B CN102603136 B CN 102603136B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- 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 a kind of method that microwave and heat integration conditioning mud improve low organic sludge anaerobically fermenting production biogas.
Background technology
China has built large amount of sewage treatment plant, and by 2009, the whole nation is built 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 has been played in the reduction of municipal pollution being loaded in construction and the operation of these sewage works, in sewage treatment process, by product municipal sludge amount also increases day by day.At present, wet mud nearly 3,000 ten thousand tons (water ratio 80%) is produced in the whole nation per year, and the center of & Mud turns to and turns to main soil utilization for resource from simple landfill.And before mud carries out the soil utilization, need mud is carried out to stabilization treatment, reclaim a large amount of biomass energy-biogas contained in mud, anaerobically fermenting is one of important measures of sludge stabilizing, not only process institute energy requirement is lower, also biomass energy in recyclable mud, be a kind of sludge resource technology that application prospect is arranged very much.
One of important factor in order of the efficiency 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, difficulty in starting often appears, gas production rate is few, and aerogenesis is unstable, has limited the sludge anaerobic fermentation technique in China's large-scale application.
Existing sludge pretreatment technology only has higher effect for the mud of high organic lower concentration, and not yet clear and definite to the treatment effect of the mud of low organic high density, its processing parameter also not yet is optimized.
Summary of the invention
For the low organic sludge difficulty in starting, gas production rate is few, and aerogenesis is unstable, be difficult to apply the anaerobism stabilization process it is processed to the defect of disposing, the purpose of this invention is to provide a kind of method that microwave and heat integration conditioning mud improve low organic sludge anaerobically fermenting production biogas.
Technical scheme of the present invention is as follows:
The invention provides a kind of method that microwave and heat integration conditioning mud improve low organic sludge anaerobically fermenting production biogas, the method comprises the following steps:
Thickened sludge and dewatered sludge are made into to mixing sludge and 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 refer to inlet amount every day=every day load=digested sludge total amount/sludge retention time.
In described anaerobic digestion process, sludge retention time is 20～30d.
It is first to carry out Microwave Pretreatment 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.
It is 35 ± 2 ℃ or 55 ± 2 ℃ that temperature is controlled in described anaerobic digestion, and regulating pH is 7.5 ± 0.5, and stirring velocity is 50～250rpm.
The present invention compared with the existing technology, has following advantage and beneficial effect:
1, the inventive method improves low organic sludge anaerobic fermentation gas production efficiency, stablize gas production rate, and energy consumption is low, and application is convenient, further promotes recycling sludge
2, the inventive method shortens low organic sludge anaerobism start time, improves low organic sludge anaerobic digestion gas production total amount, has promoted the low organic sludge recycling.
3, the inventive method makes the low organic sludge aerogenesis stable, and improves sludge biogas production speed, has shortened sludge retention time, reduces sludge anaerobic fermentor tank volume.
4, the inventive method all can be applied for different scales sewage work, only needs to increase a microwave radiation device and heating pretreatment device.
The accompanying drawing explanation
Fig. 1 means that microwave of the present invention and heat integration conditioning mud improve the schema that the low organic sludge anaerobically fermenting is produced the method for biogas.
Embodiment
Below in conjunction with the accompanying drawing illustrated embodiment, the present invention is further illustrated.
Embodiment 1
Fig. 1 means that microwave of the present invention and heat integration conditioning mud improve the schema that the low organic sludge anaerobically fermenting is produced the method for biogas.
Get somewhere sewage work dewatered sludge (water ratio is 78.91%) and thickened sludge (water ratio is 96.17%) is made into the mixing sludge that water ratio is 90.0% in the mud preparing pool, now to account for the ratio of total solids be 32.5% to its volatility organic solid.Then above-mentioned mud is dropped into to microwave radiation device, microwave frequency is 2450MHz, under the 1000W condition, through microwave exposure 1min, and then drops in heating pretreatment device, through 120 degree heating 30min.Get in the fermentor tank that the processed good above-mentioned mud of 1L drops into the 20L effective volume (sludge retention time is 20d), and discharging 1L is to collecting in mud sump.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.After moving 2～3 cycles (i.e. 40～60d) continuously, but the continous-stable aerogenesis.Experimental result is, 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
Get somewhere sewage work dewatered sludge (water ratio is 78.91%) and thickened sludge (water ratio is 96.17%) is made into the mixing sludge that water ratio is 90.0% in the mud preparing pool, now to account for the ratio of total solids be 32.5% to its volatility organic solid.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 mud sump.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 250rpm.After moving 2～3 cycles (i.e. 40～60d) continuously, but the continous-stable aerogenesis.Experimental result is, average daily gas production rate is 8.2L, and methane content is 60.12%, and degradation effect of organic compound is 24%.
As can be seen here, embodiment 1 compares comparative example 1 gas production rate and has improved 42.7%, and degradation effect of organic compound has increased 12%.
Embodiment 2
Get somewhere sewage work dewatered sludge (water ratio is 79.11%) and thickened sludge (water ratio is 97.62%) is made into the mixing sludge that water ratio is 85.0% in the mud preparing pool, now to account for the ratio of total solids be 20.0% to its volatility organic solid.Then above-mentioned mud is dropped into to microwave radiation device, microwave frequency is 2450MHz, microwave exposure 10min under the 600W condition, and then drop in heating pretreatment device, through 90 ℃ of heating 60min.Get in the fermentor tank that the processed good above-mentioned mud of 1L drops into the 25L effective volume (sludge retention time is 25d), and discharging 1L is to collecting in mud sump.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 150rpm.After moving 2～3 cycles (i.e. 50～75d) continuously, but the continous-stable aerogenesis.Experimental result is, 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
Get somewhere sewage work dewatered sludge (water ratio is 79.11%) and thickened sludge (water ratio is 97.62%) is made into the mixing sludge that water ratio is 85.0% in the mud preparing pool, now to account for the ratio of total solids be 20.0% to its volatility organic solid.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 mud sump.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 150rpm.After moving 2～3 cycles (i.e. 50～75d) continuously, but the continous-stable aerogenesis.Experimental result is, average daily gas production rate is 6.0L, and methane content is 65.56%, and degradation effect of organic compound is 20.0%.
As can be seen here, embodiment 2 compares comparative example 2 gas production rate and has improved 60.0%, and degradation effect of organic compound has increased 12%.
Embodiment 3
Get somewhere sewage work dewatered sludge (water ratio is 78.11%) and thickened sludge (water ratio is 98.35%) is made into the mixing sludge that water ratio is 95.0% in the mud preparing pool, now to account for the ratio of total solids be 45.0% to its volatility organic solid.Then above-mentioned mud is dropped in microwave radiation device, microwave frequency is 2450MHz, through microwave exposure 20min, and then drops into hot pretreatment unit under the 100W condition, through 170 degree heating 10min.Get in the fermentor tank that the processed good above-mentioned mud of 1L drops into the 30L effective volume (sludge retention time is 30d), and discharging 1L is to collecting in mud sump.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 50rpm.After moving 2～3 cycles (i.e. 50～75d) continuously, but the continous-stable aerogenesis.Experimental result is, 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
Get somewhere sewage work dewatered sludge (water ratio is 78.11%) and thickened sludge (water ratio is 98.35%) is made into the mixing sludge that water ratio is 95.0% in the mud preparing pool, now to account for the ratio of total solids be 45.0% to its volatility organic solid.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 mud sump.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH 7.5 ± 0.5, and rotating speed is controlled as 50rpm.After moving 2～3 cycles (i.e. 60～90d) continuously, but the continous-stable aerogenesis.Experimental result is, average daily gas production rate is 7.3L, and methane content is 65.32%, and degradation effect of organic compound is 29%.
As can be seen here, embodiment 3 compares comparative example 3 gas production rate and has improved 30.1%, and degradation effect of organic compound has increased 13%.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.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 (4)
1. a microwave and heat integration conditioning mud improve the method that the low organic sludge anaerobically fermenting is produced biogas, and it is characterized in that: the method comprises the following steps:
Thickened sludge and dewatered sludge are made into to mixing sludge and 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%;
It is first to carry out Microwave Pretreatment that described mixing sludge carries out pre-treatment, after carry out heat pre-treatment;
Wherein, 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.
2. microwave according to claim 1 and heat integration conditioning mud improves the method that the low organic sludge anaerobically fermenting is produced biogas, it is characterized in that: described charging or discharging refer to inlet amount every day=every day load=digested sludge total amount/sludge retention time.
3. microwave according to claim 1 and heat integration conditioning mud improve the method that the low organic sludge anaerobically fermenting is produced biogas, and it is characterized in that: in described anaerobic digestion process, sludge retention time is 20～30d.
4. microwave according to claim 1 and heat integration conditioning mud improve the method that the low organic sludge anaerobically fermenting is produced biogas, it is characterized in that: it is 35 ± 2 ℃ or 55 ± 2 ℃ that temperature is controlled in described anaerobic digestion, regulating pH is 7.5 ± 0.5, and stirring velocity is 50～250rpm.
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| CN103172242B (en) * | 2013-03-04 | 2014-12-10 | 同济大学 | Method for improving methanogenesis of residual sludge by heat and alkali combined pretreatment |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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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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| 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 |
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