CN102603135A - Method for producing biogas by aid of intensified anaerobic fermentation of circular backflow sludge in microwave and alkali combined treatment - Google Patents
Method for producing biogas by aid of intensified anaerobic fermentation of circular backflow sludge in microwave and alkali combined treatment Download PDFInfo
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Abstract
The invention belongs to the technical field of solid waste reclamation, and discloses a method for producing biogas by the aid of intensified anaerobic fermentation of circular backflow sludge in microwave and alkali combined treatment. The method includes steps: preparing concentrated sludge and dewatered sludge into mixed sludge; taking the mixed sludge as a fed material for anaerobic digestion; discharging sludge with the same volume; simultaneously repeatedly carrying out anaerobic digestion after the backflow sludge is in microwave and alkali combined treatment; and collecting the biogas. By the aid of the method, recovery ratio of anaerobic fermentation biomass energy of the sludge is increased, gas yield is stabilized, application is convenient, and sludge reclamation of the sludge is further promoted.
Description
Technical field
The invention belongs to the solid waste resource recovery technical field, relate to the method that the fermentation of a kind of microwave and alkali combination treatment pump around circuit mud reinforced anaerobic produces biogas.
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 m
3/ d, 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 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.
Traditional anaerobic digestion has sluggish, sludge retention time long (30～40 days), the pond body bulk is huge, methane production low with shortcoming such as sludge degradation degree difference, limited the performance of anaerobic digestion techniques advantage.In recent years, Chinese scholars takes in from how strengthening the pretreatment process equal angles the research that improves anaerobic sludge digestion recovery biomass energy is many, and the improvement of anaerobic digestion process is not obtained paying close attention to.
Summary of the invention
Few to China's sludge anaerobic fermentation to produce tolerance, aerogenesis is unstable; Being difficult to use the anaerobism stabilization process handles it; The purpose of this invention is to provide the method that the fermentation of a kind of microwave and alkali combination treatment pump around circuit mud reinforced anaerobic produces biogas; Through transforming anaerobic ferment process, increase the efficient that pump around circuit mud improves the sludge anaerobic fermentation.
Technical scheme of the present invention is following:
The invention provides the method that the fermentation of a kind of microwave and alkali combination treatment pump around circuit mud reinforced anaerobic produces biogas, this method may further comprise the steps:
Thickened sludge and dewatered sludge are made into mixing sludge, get above-mentioned mixing sludge and carry out anaerobic digestion as charging, and the mud of discharging equal volume, returned sluge is after microwave and alkali associating pre-treatment simultaneously, and anaerobic digestion is carried out in recycling, collects biogas.
Sludge retention time is 20～30d in the described anaerobic digestion process.
Described charging or discharging are meant inlet amount every day=every day load=fermented sludge total amount/sludge retention time.
The water ratio of described mixing sludge is 88～98%.
Described microwave and alkali associating pre-treatment are meant that carrying out alkaline hydrolysis earlier regulates pre-treatment, carry out Microwave Pretreatment then, and before carrying out anaerobic digestion once more, add hydrochloric acid adjusting pH to 7.5 ± 0.5.
Described alkaline hydrolysis adjusting pre-treatment is meant and adds alkaline reagents, mud is under the alkaline condition to reach the purpose that cracks cell walls.
Described alkaline reagents is sodium hydroxide (NaOH), unslaked lime (CaO) or calcium hydroxide (Ca (OH) 2), and it is 0.05～0.15g that every gram volatility organic solid VS adds alkaline reagents, i.e. 0.05～0.15g/g VS.
The process conditions of described Microwave Pretreatment is: microwave frequency is 2450MHz, and microwave irradiation power is 100～1000w, and radiated time is 1～20min.
Described anaerobic digestion controlled temperature is 35 ± 2 ℃ or 55 ± 2 ℃, and regulating pH is 7.5 ± 0.5, and stirring velocity is 30～250rpm.
The reflux ratio of described returned sluge is 5～10%.
The present invention compares with prior art, has following advantage and beneficial effect:
1, the inventive method has improved the sludge anaerobic fermenting organism mass-energy recovery, stablizes gas production rate, and convenient in application further promotes recycling sludge.
2, the inventive method increases microwave and alkali combination treatment pump around circuit sludge system, has both strengthened the mixed effect of fermentation system, has strengthened the dissolving of solid organic matters again, makes the operation of reactor drum efficient stable.
3, the inventive method improves the sludge anaerobic digestion gas production total amount, has shortened sludge retention time, reduces sludge anaerobic fermentor tank volume.
Description of drawings
Fig. 1 representes that microwave of the present invention and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the schema of the method for biogas.
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 the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the schema of the method for biogas.
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 92%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get the above-mentioned mixing sludge of 1L and drop in the fermentor tank of 20L effective volume, and the 1L of discharging simultaneously is to collecting (the corresponding residence time is 20d) in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition; To the alkaline hydrolysis setting device, add NaOH through the ripe mud of gravity reflux 1L (reflux ratio is 5%) every day under the agitation condition of 120rpm, the NaOH dosage is 0.05g/gVS; And then be fed into microwave radiation device; Microwave frequency is 2450MHz, behind microwave exposure 1min, is regulating pH to 7.5 ± 0.5 through adding hydrochloric acid under the 1000W condition, and is pumping in the fermentor tank through the recycle feed mouth through sludge circulation pump.Collect gas through methane-generating pit every day, and 35 ± 2 ℃ of controlled temperature, regulates pH7.5 ± 0.5 automatically, and rotating speed is controlled to be 100rpm.Continuously operation 2～3 cycles (promptly after 40～60d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 12～13L, and methane content is 65.6%, and degradation effect of organic compound is 34%.
Comparative example 1
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 92%, and VS/TS is 0.45 mixing sludge.Every day, normal input and output material was following: get the above-mentioned mixing sludge of 1L and drop in the fermentor tank of 20L effective volume, and the 1L of discharging simultaneously is to collecting (the corresponding residence time is 20d) 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 100rpm.Continuously operation 2～3 cycles (promptly after 40～60d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 10～11L, and methane content is 64.5%, and degradation effect of organic compound is 28%.
This shows that relatively routine 1 gas production rate of embodiment 1 has improved 15.4～20.0%, degradation effect of organic compound has increased 6%.
Embodiment 2
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 98%, and VS/TS is 0.75 mixing sludge.Every day, normal input and output material was following: get the above-mentioned mixing sludge of 2L and drop in the fermentor tank of 60L effective volume, and the 2L of discharging simultaneously is to collecting (the corresponding residence time is 30d) in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition; To the alkaline hydrolysis setting device, add CaO through the ripe mud of gravity reflux 4L (reflux ratio is 6.7%) every day under the agitation condition of 120rpm, the CaO dosage is 0.10g/gVS; And then be fed into microwave radiation device; Microwave frequency is 2450MHz, behind microwave exposure 10min under the 600W condition, regulates pH to 7.5 ± 0.5 through adding hydrochloric acid, and pumps in the fermentor tank through the recycle feed mouth through sludge circulation pump.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 50rpm.Continuously operation 2～3 cycles (promptly after 60～90d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 13.5～14.5L, and methane content is 65.6%, and degradation effect of organic compound is 40%.
Comparative example 2
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 98%, and VS/TS is 0.75 mixing sludge.Every day, normal input and output material was following: get the above-mentioned mixing sludge of 2L and drop in the fermentor tank of 60L effective volume, and the 2L of discharging simultaneously is to collecting (the corresponding residence time is 30d) 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 50rpm.Continuously operation 2～3 cycles (promptly after 60～90d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 12.0～13.0L, and methane content is 61.5%, and degradation effect of organic compound is 34%.
This shows that relatively routine 2 gas production rate of embodiment 2 have improved 11.5～12.5%, degradation effect of organic compound has increased 6%.
Embodiment 3
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 88%, and VS/TS is 0.33 mixing sludge.Every day, normal input and output material was following: get the above-mentioned mixing sludge of 800mL and drop in the fermentor tank of 20L effective volume, and the 1L of discharging simultaneously is to collecting (the corresponding residence time is 25d) in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition, to the alkaline hydrolysis setting device, add Ca (OH) through the ripe mud of gravity reflux 2L (reflux ratio is 10%) every day under the agitation condition of 120rpm
2, Ca (OH)
2Dosage is 0.15g/gVS; And then in the input microwave radiation device; Microwave frequency is 2450MHz, behind microwave exposure 5min, is regulating pH to 7.5 ± 0.5 through adding hydrochloric acid under the 800W condition, and is pumping in the fermentor tank through the recycle feed mouth through sludge circulation pump.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 10～11L, and methane content is 66.3%, and degradation effect of organic compound is 33%.
Comparative example 3
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 88%, and VS/TS is 0.33 mixing sludge.Every day, normal input and output material was following: get the above-mentioned mixing sludge of 800mL and drop in the fermentor tank of 20L effective volume, and the 1L of discharging simultaneously is to collecting (the corresponding residence time is 25d) 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 250rpm.Continuously operation 2～3 cycles (promptly after 50～75d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 8～9L, and methane content is 62.3%, and degradation effect of organic compound is 27%.
This shows that relatively routine 3 gas production rate of embodiment 3 have improved 22.2～25.0%, degradation effect of organic compound has increased 6%.
Embodiment 4
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 94%, and VS/TS is 0.54 mixing sludge.Every day, normal input and output material was following: get the above-mentioned mixing sludge of 1500mL and drop in the fermentor tank of 40L effective volume, and the 1500mL of discharging simultaneously is to collecting (the corresponding residence time is 23.7d) in the mud sump.In the fermentor tank lower end circulation discharge port is set in addition; To the alkaline hydrolysis setting device, add NaOH through the ripe mud of gravity reflux 3L (reflux ratio is 7.5%) every day under the agitation condition of 120rpm, the NaOH dosage is 0.08g/gVS; And then in the input microwave radiation device; Microwave frequency is 2450MHz, behind microwave exposure 20min, is regulating pH to 7.5 ± 0.5 through adding hydrochloric acid under the 200W condition, and is pumping in the fermentor tank through the recycle feed mouth through sludge circulation pump.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 53.4～80.1d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 16～17L, and methane content is 66.2%, and degradation effect of organic compound is 38%.
Comparative example 4
Getting somewhere sewage work thickened sludge and dewatered sludge, in the mud preparing pool, to be made into water ratio be 94%, and VS/TS is 0.54 mixing sludge.Every day, normal input and output material was following: get the above-mentioned mixing sludge of 1500mL and drop in the fermentor tank of 40L effective volume, and the 1500mL of discharging simultaneously is to collecting (the corresponding residence time is 23.7d) in the mud sump.Collect gas through methane-generating pit every day, and 55 ± 2 ℃ of controlled temperature, regulates pH7.5 ± 0.5 automatically, and rotating speed is controlled to be 250rpm.Continuously operation 2～3 cycles (promptly after 53.4～80.1d), but the continous-stable aerogenesis.Experimental result does, average daily gas production rate is 13～14L, and methane content is 63.2%, and degradation effect of organic compound is 30%.
This shows that relatively routine 4 gas production rate of embodiment 4 have improved 21.4～23.1%, degradation effect of organic compound has increased 8%.
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 (10)
1. the fermentation of microwave and alkali combination treatment pump around circuit mud reinforced anaerobic produces the method for biogas, and it is characterized in that: this method may further comprise the steps:
Thickened sludge and dewatered sludge are made into mixing sludge, get above-mentioned mixing sludge and carry out anaerobic digestion as charging, and the mud of discharging equal volume, returned sluge is after microwave and alkali associating pre-treatment simultaneously, and anaerobic digestion is carried out in recycling, collects biogas.
2. microwave according to claim 1 and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the method for biogas, and it is characterized in that: sludge retention time is 20～30d in the described anaerobic digestion process.
3. the fermentation of microwave according to claim 1 and alkali combination treatment pump around circuit mud reinforced anaerobic produces the method for biogas, it is characterized in that: described charging or discharging are meant inlet amount every day=every day load=fermented sludge total amount/sludge retention time.
4. microwave according to claim 1 and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the method for biogas, and it is characterized in that: the water ratio of described mixing sludge is 88～98%.
5. microwave according to claim 1 and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the method for biogas; It is characterized in that: described microwave and alkali associating pre-treatment are meant that carrying out alkaline hydrolysis earlier regulates pre-treatment; Carry out Microwave Pretreatment then, and before carrying out anaerobic digestion once more, add hydrochloric acid adjusting pH to 7.5 ± 0.5.
6. microwave according to claim 5 and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the method for biogas, it is characterized in that: described alkaline hydrolysis adjusting pre-treatment is meant and adds alkaline reagents.
7. microwave according to claim 6 and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the method for biogas; It is characterized in that: described alkaline reagents is sodium hydroxide, unslaked lime or calcium hydroxide; It is 0.05～0.15g that every gram volatility organic solid VS adds alkaline reagents, i.e. 0.05～0.15g/g VS.
8. microwave according to claim 5 and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the method for biogas; It is characterized in that: the process conditions of described Microwave Pretreatment is: microwave frequency is 2450MHz; Microwave irradiation power is 100～1000w, and radiated time is 1～20min.
9. microwave according to claim 1 and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the method for biogas; 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 30～250rpm.
10. microwave according to claim 1 and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the method for biogas, and it is characterized in that: the reflux ratio of described returned sluge is 5～10%.
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| 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 |
| CN103626365A (en) * | 2013-11-26 | 2014-03-12 | 华南理工大学 | Method for adjusting pH value of alkali pretreated sludge by use of alkali neutralizing capacity of excess sludge |
| CN103708696A (en) * | 2013-12-20 | 2014-04-09 | 华南理工大学 | Method for fast producing methane by utilizing excess sludge |
| CN104761110A (en) * | 2015-04-03 | 2015-07-08 | 李文新 | Sludge treatment method for sewage plants |
| CN104773933A (en) * | 2015-04-03 | 2015-07-15 | 李文新 | Treatment system for sewage plant sludge |
| CN105836994A (en) * | 2016-05-27 | 2016-08-10 | 轻工业环境保护研究所 | Intermediate-enhanced sludge digestion process |
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| 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 |
| CN103626365B (en) * | 2013-11-26 | 2016-01-06 | 华南理工大学 | A kind of method utilizing excess sludge alkali neutralising capacity to regulate oxygenation pretreatment sludge pH |
| CN103626365A (en) * | 2013-11-26 | 2014-03-12 | 华南理工大学 | Method for adjusting pH value of alkali pretreated sludge by use of alkali neutralizing capacity of excess sludge |
| CN103708696A (en) * | 2013-12-20 | 2014-04-09 | 华南理工大学 | Method for fast producing methane by utilizing excess sludge |
| CN104773933B (en) * | 2015-04-03 | 2016-07-06 | 重庆鼎旺环保园林有限公司 | A kind of process system of sewage plant sludge |
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| 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 |
| CN106316028A (en) * | 2016-10-12 | 2017-01-11 | 黑龙江大学 | Method for performing combined treatment on motor vehicle cleaning sludge |
| CN106542708A (en) * | 2016-10-14 | 2017-03-29 | 浙江工商大学 | A kind of pig feces pretreatment and the method and device of anaerobic fermentation |
| CN106565064A (en) * | 2016-10-14 | 2017-04-19 | 浙江工商大学 | Combined pretreatment method before anaerobic digestion of cow dung |
| CN106542708B (en) * | 2016-10-14 | 2020-05-22 | 浙江工商大学 | Method and device for pretreatment and anaerobic fermentation of pig raising excrement |
| CN106565064B (en) * | 2016-10-14 | 2020-08-11 | 浙江工商大学 | Combined pretreatment method before anaerobic digestion of cow dung |
| CN114736055A (en) * | 2022-04-10 | 2022-07-12 | 同济大学 | Method for preparing organic nitrogen-calcium fertilizer based on sludge |
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