CN102603135B - 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 PDF

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CN102603135B
CN102603135B CN2012100726419A CN201210072641A CN102603135B CN 102603135 B CN102603135 B CN 102603135B CN 2012100726419 A CN2012100726419 A CN 2012100726419A CN 201210072641 A CN201210072641 A CN 201210072641A CN 102603135 B CN102603135 B CN 102603135B
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sludge
microwave
biogas
fermentation
anaerobic
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CN102603135A (en
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严媛媛
陈汉龙
冯雷雨
戴晓虎
周琪
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Tongji University
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Tongji University
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel

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

Microwave and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce the method for biogas
Technical field
The invention belongs to the solid waste resource recovery technical field, relate to a kind of method that microwave and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce 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 m 3/ d, 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 resource and turns to main soil utilization 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 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.
Traditional anaerobic digestion has sluggish, sludge retention time long (30~40 days), and the shortcoming such as the pond body bulk is huge, and the low and sludge degradation degree of methane production is poor, limited the performance of anaerobic digestion techniques advantage.In recent years, how Chinese scholars reclaims biomass energy research to improving anaerobic sludge digestion from how strengthening the pretreatment process equal angles takes in, and the improvement of anaerobic digestion process is not paid close attention to.
Summary of the invention
Few for China's sludge anaerobic fermentation to produce tolerance, aerogenesis is unstable, being difficult to apply the anaerobism stabilization process is processed it, the purpose of this invention is to provide a kind of method that microwave and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce biogas, by the transformation anaerobic ferment process, increase the efficiency that pump around circuit mud improves the sludge anaerobic fermentation.
Technical scheme of the present invention is as follows:
The invention provides a kind of method that microwave and the fermentation of alkali combination treatment pump around circuit mud reinforced anaerobic produce biogas, the method comprises the following steps:
Thickened sludge and dewatered sludge are made into to 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 combined pretreatment simultaneously, and anaerobic digestion is carried out in recirculation, collects biogas.
In described anaerobic digestion process, sludge retention time is 20~30d.
Described charging or discharging refer to 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 combined pretreatment refer to that first carrying out alkaline hydrolysis regulates pre-treatment, then carries out Microwave Pretreatment, and add salt acid for adjusting pH to 7.5 ± 0.5 before again carrying out anaerobic digestion.
Described alkaline hydrolysis is regulated pre-treatment and is referred to and add alkaline reagents, make mud under 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.
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 30~250rpm.
The reflux ratio of described returned sluge is 5~10%.
The present invention compared with the existing technology, has following advantage and beneficial effect:
1, the inventive method has improved the sludge anaerobic fermenting organism mass-energy rate of recovery, stablizes gas production rate, and application is convenient, 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 again the dissolving of solid organic matters, makes the operation of reactor 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.
The accompanying drawing explanation
Fig. 1 means 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 illustrated.
Embodiment 1
Fig. 1 means 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, to be made into water ratio in the mud preparing pool be the mixing sludge that 92%, VS/TS is 0.45.Every day, normal input and output material was as follows: 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 integrating (the corresponding residence time is as 20d) in mud sump.Separately in the fermentor tank lower end, the circulation discharge port is set, every day by the ripe mud of gravity reflux 1L (reflux ratio is 5%) to the alkaline hydrolysis setting device, add NaOH 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, under the 1000W condition after microwave exposure 1min by adding salt acid for adjusting pH to 7.5 ± 0.5, and pump in fermentor tank through the recycle feed mouth by sludge circulation pump.Collect gas by methane-generating pit every day, and control 35 ± 2 ℃ of temperature, automatically regulates pH7.5 ± 0.5, and rotating speed is controlled as 100rpm.After moving 2~3 cycles (i.e. 40~60d) continuously, but the continous-stable aerogenesis.Experimental result is, 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, to be made into water ratio in the mud preparing pool be the mixing sludge that 92%, VS/TS is 0.45.Every day, normal input and output material was as follows: 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 integrating (the corresponding residence time is as 20d) 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 100rpm.After moving 2~3 cycles (i.e. 40~60d) continuously, but the continous-stable aerogenesis.Experimental result is, average daily gas production rate is 10~11L, and methane content is 64.5%, and degradation effect of organic compound is 28%.
As can be seen here, embodiment 1 relatively example 1 gas production rate has improved 15.4~20.0%, and degradation effect of organic compound has increased 6%.
Embodiment 2
Getting somewhere sewage work thickened sludge and dewatered sludge, to be made into water ratio in the mud preparing pool be the mixing sludge that 98%, VS/TS is 0.75.Every day, normal input and output material was as follows: 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 integrating (the corresponding residence time is as 30d) in mud sump.Separately in the fermentor tank lower end, the circulation discharge port is set, every day by the ripe mud of gravity reflux 4L (reflux ratio is 6.7%) to the alkaline hydrolysis setting device, add CaO 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, under the 600W condition after microwave exposure 10min by adding salt acid for adjusting pH to 7.5 ± 0.5, and pump in fermentor tank through the recycle feed mouth by sludge circulation pump.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 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 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, to be made into water ratio in the mud preparing pool be the mixing sludge that 98%, VS/TS is 0.75.Every day, normal input and output material was as follows: 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 integrating (the corresponding residence time is as 30d) 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 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 12.0~13.0L, and methane content is 61.5%, and degradation effect of organic compound is 34%.
As can be seen here, embodiment 2 relatively example 2 gas production rate has improved 11.5~12.5%, and degradation effect of organic compound has increased 6%.
Embodiment 3
Getting somewhere sewage work thickened sludge and dewatered sludge, to be made into water ratio in the mud preparing pool be the mixing sludge that 88%, VS/TS is 0.33.Every day, normal input and output material was as follows: 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 integrating (the corresponding residence time is as 25d) in mud sump.Separately in the fermentor tank lower end, the circulation discharge port is set, to the alkaline hydrolysis setting device, add Ca (OH) by 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, under the 800W condition after microwave exposure 5min by adding salt acid for adjusting pH to 7.5 ± 0.5, and pump in fermentor tank through the recycle feed mouth by sludge circulation pump.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH7.5 ± 0.5, and rotating speed is controlled as 250rpm.After moving 2~3 cycles (i.e. 50~75d) continuously, but the continous-stable aerogenesis.Experimental result is, 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, to be made into water ratio in the mud preparing pool be the mixing sludge that 88%, VS/TS is 0.33.Every day, normal input and output material was as follows: 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 integrating (the corresponding residence time is as 25d) 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 250rpm.After moving 2~3 cycles (i.e. 50~75d) continuously, but the continous-stable aerogenesis.Experimental result is, average daily gas production rate is 8~9L, and methane content is 62.3%, and degradation effect of organic compound is 27%.
As can be seen here, embodiment 3 relatively example 3 gas production rate has improved 22.2~25.0%, and degradation effect of organic compound has increased 6%.
Embodiment 4
Getting somewhere sewage work thickened sludge and dewatered sludge, to be made into water ratio in the mud preparing pool be the mixing sludge that 94%, VS/TS is 0.54.Every day, normal input and output material was as follows: 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 integrating (the corresponding residence time is as 23.7d) in mud sump.Separately in the fermentor tank lower end, the circulation discharge port is set, every day by the ripe mud of gravity reflux 3L (reflux ratio is 7.5%) to the alkaline hydrolysis setting device, add NaOH 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, under the 200W condition after microwave exposure 20min by adding salt acid for adjusting pH to 7.5 ± 0.5, and pump in fermentor tank through the recycle feed mouth by sludge circulation pump.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH7.5 ± 0.5, and rotating speed is controlled as 250rpm.After moving 2~3 cycles (i.e. 53.4~80.1d) continuously, but the continous-stable aerogenesis.Experimental result is, 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, to be made into water ratio in the mud preparing pool be the mixing sludge that 94%, VS/TS is 0.54.Every day, normal input and output material was as follows: 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 integrating (the corresponding residence time is as 23.7d) in mud sump.Collect gas by methane-generating pit every day, and control 55 ± 2 ℃ of temperature, automatically regulates pH7.5 ± 0.5, and rotating speed is controlled as 250rpm.After moving 2~3 cycles (i.e. 53.4~80.1d) continuously, but the continous-stable aerogenesis.Experimental result is, average daily gas production rate is 13~14L, and methane content is 63.2%, and degradation effect of organic compound is 30%.
As can be seen here, embodiment 4 relatively example 4 gas production rate has improved 21.4~23.1%, and degradation effect of organic compound has increased 8%.
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 (7)

1. a microwave 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 method comprises the following steps:
Thickened sludge and dewatered sludge are made into to 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 combined pretreatment simultaneously, and anaerobic digestion is carried out in recirculation, collects biogas;
Wherein, the water ratio of described mixing sludge is 88~98%;
The reflux ratio of described returned sluge is 5~10%;
Described charging or discharging refer to inlet amount every day=every day load=fermented sludge total amount/sludge retention time.
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: in described anaerobic digestion process, sludge retention time is 20~30d.
3. 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 combined pretreatment refer to that first carrying out alkaline hydrolysis regulates pre-treatment, then carry out Microwave Pretreatment, and add salt acid for adjusting pH to 7.5 ± 0.5 before again carrying out anaerobic digestion.
4. microwave according to claim 3 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 refers to and adds alkaline reagents.
5. microwave according to claim 4 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.
6. microwave according to claim 3 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.
7. 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: 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 30~250rpm.
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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
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
CN103708696B (en) * 2013-12-20 2015-04-22 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
CN104761110B (en) * 2015-04-03 2016-02-10 温州中城晟泰市政工程有限公司 A kind for the treatment of process of sewage plant sludge
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
CN106565064B (en) * 2016-10-14 2020-08-11 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

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CN201620096U (en) * 2010-01-08 2010-11-03 东北农业大学 Mixed sludge return biogas generator
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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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