CN102020404A - Method for improving fermentation capability of slurry dry process - Google Patents

Method for improving fermentation capability of slurry dry process Download PDF

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Publication number
CN102020404A
CN102020404A CN 201010567031 CN201010567031A CN102020404A CN 102020404 A CN102020404 A CN 102020404A CN 201010567031 CN201010567031 CN 201010567031 CN 201010567031 A CN201010567031 A CN 201010567031A CN 102020404 A CN102020404 A CN 102020404A
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China
Prior art keywords
fermentation
slurry
sludge
dry
dewatered sludge
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Pending
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CN 201010567031
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Chinese (zh)
Inventor
董滨
段妮娜
何群彪
戴晓虎
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Tongji University
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Tongji University
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Priority to CN 201010567031 priority Critical patent/CN102020404A/en
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Abstract

The invention provides a method for improving the fermentation capability of a slurry dry process, belonging to the field of solid waste recycling, which can be used for solving the problems that reacted intermediate products and energy are difficult to transmit and diffuse in a medium resulted from the large viscosity of reaction matrix and high total solid (TS) concentration; slow hydrolysis acidification and low aerogenesis speed are caused by that a large amount of substances difficult to degrade exist in slurry and the further biotransformation is limited by the microbial residue cell-wall structure. In the method, dewatered slurry is placed in microwave of which the frequency is 915MHz and the power is 10-60kW for carrying out pretreatment for 3-10 minutes; the pretreated dewatered slurry is cooled to the selected fermentation temperature, and then mixes with seed slurry uniformly based on the mass ratio of 5: 1-3:1 to obtain a mixture which is placed in an anaerobic fermentation tank for standing for 3-5 days in a sealing and non-stirring state; a stirring motor is started, and the stirring speed is controlled to 10-30r/min; and materials are fed and discharged continuously so as to ensure the materials to stay in the anaerobic fermentation tank for 40-60 days. The method for improving the fermentation capability of the slurry dry process can be used to reduce the slurry viscosity and improve the dry fermentation rate and gas production rate; and in addition, the method for improving the fermentation capability of the slurry dry process can be used to save equipment investment and land occupancy compared with the wet fermentation.

Description

A kind of method that improves mud dry method leavening property
Technical field
The invention belongs to useless admittedly resource utilization field, be specifically related to a kind of method that improves mud dry method leavening property.
Background technology
The municipal sewage plant is huge because of the dewatered sludge amount that purifying domestic sewage produces, but annual at present collecting amount is about 2,600 ten thousand tons, sewage work to the processing of mud with dispose the methods of carrying out landfill after the thickenings that adopt more, not only take limited land resources, and easily cause secondary pollution.In addition, the resource utilization of landfill is lower, does not meet China's principle of sustainable development.In recent years, it is main transformation to the various energy resources and the direction of depositing that the global energy structure is just experiencing with the fossil energy, problem such as grain security and environmental degradation also becomes increasingly conspicuous, and the employing anaerobic fermentation technology reclaims the non-grain biomass energy in the mud---and biogas obtains paying attention to gradually.
According to the solids content (TS) of material in the reactor, anaerobic fermentation technology can be divided into wet type fermentation (TS≤12%) and dry type fermentation (TS 〉=20 %) two kinds.The wet type fermentation technique produces aspects such as natural pond, fowl and animal excrement anaerobic fermentation natural pond and organic waste anaerobic methane production in municipal sludge (TS is about 2%) digestion and has been applied, and the technology of each side is comparative maturity.Compare with wet-fermentation technology, the dry method zymotechnique has following advantage: (1) load is big, volume production capacity height, and equipment volume reduces greatly; (2) water requirement is low or do not need water, conserve water resource; (3) generation natural pond liquid is few, and the waste residue water content is low, and the subsequent disposal expense is low; (4) operational process is stable, problems such as the scum silica frost in the no wet processing, precipitation; (5) foul smell discharging is few etc.
At present, aspect the dry method fermentation, European various countries have carried out at the lower domestic refuse of water ratio and have carried out the development of anaerobic fermentation technology and equipment.China carries out less in the research work aspect the dry method fermentation technique, also lack systematicness.Relevant dry method fermentation process is primarily aimed at agricultural stalk (CN101338273, CN101338325), organic waste (CN101381674A), about carry out the method for dry method fermentation with dewatered sludge, and the pretreatment process that improves mud dry method leavening property, there is no report.
In mud dry method fermenting process,, cause reaction intermediate and energy in medium, to transmit, spread difficulty because response matrix viscosity is big, TS concentration height; In addition, owing to contain the residual body of microorganism in a large amount of hard-degraded substances and the aerobic treatment process in the mud, cell wall structure limits further bio-transformation, cause the acidication bacterium to be difficult for breeding, produce the available substrate deficiency of methane phase, aerogenesis speed is slow, is one of important difficult point of mud dry method zymotechnique.
Summary of the invention
The objective of the invention is to overcome in the municipal sludge dry method fermenting process owing to contain in the material acidication process that the residual body of a large amount of hard-degraded substances and microorganism causes slow, produce problems such as methane substrate deficiency, fermenting process are slow, a kind of method that improves mud dry method leavening property is provided.
The method of the raising mud dry method leavening property that the present invention proposes, concrete steps are as follows:
(1) pre-treatment
Regulate the dewatered sludge water ratio, make its water ratio 85%, it is that 915MHz, power are pre-treatment 3 ~ 10 minutes under the microwave of 10 ~ 60kW that dewatered sludge is placed frequency, makes the water ratio through dewatered sludge after the pre-treatment〉75%;
(2) fermentation starting
Pretreated dewatered sludge is cooled to selected leavening temperature, mixes with seed sludge and be placed in the anaerobic fermentation tank, under airtight, no whipped state, left standstill 3 ~ 5 days; Mass ratio 5:1 ~ the 3:1 of pretreated dewatered sludge and seed sludge;
(3) steady running
Leave standstill startup after 3 ~ 5 days, open agitator motor, control its opening time every day 8h, during stirring, the control mixing speed is 10 ~ 30r/min, makes sludge fermentation intermediate product thorough mixing; Beginning continuously feeding and discharging, making material residence time in anaerobic fermentation tank is 40 ~ 60 days.
Among the present invention, the maintenance temperature of charge is a certain temperature value in 35 ~ 40 ℃ or 50 ~ 55 ℃ in step (1) and the step (3) ,≤2 ℃ of controlled temperature fluctuations, and redox potential≤-300mV; Leavening temperature is a certain temperature value in 35 ~ 40 ℃ or 50 ~ 55 ℃ in the step (2) ,≤2 ℃ of controlled temperature fluctuations, and redox potential≤-300mV.
Among the present invention, seed sludge can adopt the granule sludge of unpretreated dewatered sludge, other anaerobic reactors or the natural pond slag behind the early stage anaerobically fermenting in the step (2).
Among the present invention, step need fully stir in (3), control stirring rotator rotating speed 10-30r/min.
Among the present invention, charging is through the pretreated dewatered sludge of step (1) in the step (3).
The present invention has following advantage:
1. through after the Microwave Pretreatment, material viscosity can reduce by 50 ~ 70%, helps abundant mass transfer of dry method fermenting process and microorganism, enzyme-to-substrate thorough mixing;
2. Microwave Pretreatment can be destroyed the cell wall structure of a large amount of residual bodies of microorganism in the mud, make the intracellular organic matter stripping, and in the promotion mud hard-degraded substance as protecting the decomposition of outer polymkeric substance etc., can improve the anaerobism degradability of material, accelerate the acidication process, for methanogen provides fermentation substrate, strengthen aerogenesis.
3. Microwave Pretreatment heating efficiency height, energy consumption is low, and pretreated material carries out thermophilic fermentation can significantly accelerate course of fermentation, improves the rate in term.
Embodiment
Further specify the present invention below by embodiment.
Embodiment 1:
Get Sewage Plant A dewatered sludge 20kg, add suitable quantity of water, regulating water ratio is 87%; Is that 915MHz, power are heating 5 minutes in the microwave heater of 10kW with material in frequency, and recording heating back material water ratio is 80%; Mud after the Microwave Pretreatment is cooled to 35 ± 1 ℃, with mix without pretreated dewatered sludge 6kg after put into anaerobic fermentation tank, open temperature control unit, temperature of charge is 35 ± 1 ℃ in the control fermenting process, staticly starts 3 days; Open agitator motor, rotating speed is 15r/min, and agitator motor is opened 1h, stops the 1h running; Start gas dosing and collection device; Every day input and output material 500g, charging is for through the dewatered sludge of Microwave Pretreatment; Every 3d monitoring material pH, gas production rate and aerogenic composition, fermenting process can be stablized and carry out.
Embodiment 2:
Get Sewage Plant B dewatered sludge 20kg, add suitable quantity of water, regulating water ratio is 90%; Is that 915MHz, power are heating 8 minutes in the microwave heater of 10kW with material in frequency, and recording heating back material water ratio is 80%; Mud after the Microwave Pretreatment is cooled to 55 ± 1 ℃, puts into anaerobic fermentation tank after mixing with prior fermentation natural pond slag 7kg, open temperature control unit, temperature of charge is 55 ± 1 ℃ in the control fermenting process, static startup 2 days; Open agitator motor, rotating speed is 15r/min, and agitator motor is opened 1h, stops the 1h running; Start gas dosing and collection device; Every day input and output material 900g, charging is for through the dewatered sludge of Microwave Pretreatment; Every 2d monitoring material pH, gas production rate and aerogenic composition, fermenting process can be stablized and carry out.

Claims (4)

1. method that improves mud dry method leavening property is characterized in that concrete steps are as follows:
(1) pre-treatment
Regulate the dewatered sludge water ratio, make its water ratio 85%, it is that 915MHz, power are under the microwave of 10-60kW pre-treatment 3-10 minute that dewatered sludge is placed frequency, makes the water ratio through dewatered sludge after the pre-treatment〉75%;
(2) fermentation starting
Pretreated dewatered sludge is cooled to leavening temperature, mixes with seed sludge and be placed in the anaerobic fermentation tank, under airtight, no whipped state, left standstill 3-5 days; The mass ratio 5:1-3:1 of pretreated dewatered sludge and seed sludge;
(3) steady running
Leave standstill startup after 3-5 days, open agitator motor, control its opening time every day 8h, during stirring, the control mixing speed is 10-30r/min, makes sludge fermentation intermediate product thorough mixing; Beginning continuously feeding and discharging, making material residence time in anaerobic fermentation tank is 40-60 days.
2. the method for raising mud dry method leavening property according to claim 1, it is characterized in that the middle maintenance of step (1) and step (3) temperature of charge is a certain temperature value in 35-40 ℃ or 50-55 ℃, ≤ 2 ℃ of controlled temperature fluctuations, redox potential≤-300mV; Leavening temperature is a certain temperature value in 35-40 ℃ or 50-55 ℃ in the step (2) ,≤2 ℃ of controlled temperature fluctuations, and redox potential≤-300mV.
3. the method for raising mud dry method leavening property according to claim 1 is characterized in that seed sludge in the step (2) adopts the granule sludge of unpretreated dewatered sludge, other anaerobic reactors or the natural pond slag behind the early stage anaerobically fermenting.
4. the method for raising mud dry method leavening property according to claim 1 is characterized in that charging is through the pretreated dewatered sludge of step (1) in the step (3).
CN 201010567031 2010-12-01 2010-12-01 Method for improving fermentation capability of slurry dry process Pending CN102020404A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102557375A (en) * 2012-03-19 2012-07-11 同济大学 Two-phase return microwave-assisted anaerobic digestion method for sludge
CN102580978A (en) * 2012-01-17 2012-07-18 广州中科建禹水处理技术有限公司 Kitchen waste biochemical continuous processing process
CN102603142A (en) * 2012-03-19 2012-07-25 同济大学 Method for producing biogas by aid of intensified anaerobic fermentation of pretreated circular backflow sludge
CN102603141A (en) * 2012-03-19 2012-07-25 同济大学 Method for improving methane yield through anaerobic fermentation of low organic matter sludge by pretreatment
CN102643000A (en) * 2012-05-09 2012-08-22 同济大学 Method for improving semi-dry fermentation stability of municipal sludge by adding cassava vinasse
CN105130151A (en) * 2015-09-08 2015-12-09 台明青 Method for improving anaerobic digestion factor of created gas of residual sludge by using artificial diamond waste water

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101413014A (en) * 2007-10-19 2009-04-22 湖南大学 Method and apparatuses for pretreating sewage plant excess sludge by microwave method and producing hydrogen by fermentation
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101413014A (en) * 2007-10-19 2009-04-22 湖南大学 Method and apparatuses for pretreating sewage plant excess sludge by microwave method and producing hydrogen by fermentation
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
《环境科学》 20080630 乔玮等 高固体污泥微波热水解特性变化 1611-1615 1-4 第29卷, 第6期 2 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102580978A (en) * 2012-01-17 2012-07-18 广州中科建禹水处理技术有限公司 Kitchen waste biochemical continuous processing process
CN102557375A (en) * 2012-03-19 2012-07-11 同济大学 Two-phase return microwave-assisted anaerobic digestion method for sludge
CN102603142A (en) * 2012-03-19 2012-07-25 同济大学 Method for producing biogas by aid of intensified anaerobic fermentation of pretreated circular backflow sludge
CN102603141A (en) * 2012-03-19 2012-07-25 同济大学 Method for improving methane yield through anaerobic fermentation of low organic matter sludge by pretreatment
CN102603142B (en) * 2012-03-19 2014-03-05 同济大学 Method for producing biogas by aid of intensified anaerobic fermentation of pretreated circular backflow sludge
CN102643000A (en) * 2012-05-09 2012-08-22 同济大学 Method for improving semi-dry fermentation stability of municipal sludge by adding cassava vinasse
CN105130151A (en) * 2015-09-08 2015-12-09 台明青 Method for improving anaerobic digestion factor of created gas of residual sludge by using artificial diamond waste water

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Application publication date: 20110420