CN103922554B - The mediation of microorganism electricity promotes the method for anaerobic sludge digestion - Google Patents
The mediation of microorganism electricity promotes the method for anaerobic sludge digestion Download PDFInfo
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Abstract
The mediation of microorganism electricity promotes the method for anaerobic sludge digestion, and it relates to a kind of quick methanogenic method of organic waste biomass.There is mud flco broken wall difficulty to solve existing sludge anaerobic zymotechnique in the present invention, in sludge microbe cell organic being difficult to fully be released into the low technical problem of liquid phase, the organic utilization ratio of mud and methane recovery.Present method is as follows: one, sludge pretreatment; Two, anode electrolysis flora functional microorganism domestication; Three, the mediation of microorganism electricity promotes anaerobic sludge digestion.The present invention has transformed the proton in system faster by the electric mediation of microorganism catalysis electrolytic system, Electronically effectively transform complicated Determination of Organic Acids simultaneously, the restraining effect of acid accumulation in elimination system, effectively can promote anaerobic sludge digestion and methanogenic velocity ratio and output.The invention belongs to microorganism electrolysis and promote the methanogenic field of excess sludge.
Description
Technical field
The present invention relates to a kind of quick methanogenic method of organic waste biomass.
Background technology
Municipal sludge makes the minimizing of mud and resource utilization become the problem of world wide extensive concern to the potential hazard of environment and high processing costs thereof, and utilize excess sludge methane phase to be one of most important mode realizing its resource utilization, anaerobic digestion process is sludge stabilization metallization processes the most feasible at present, compared with other biochemical methods, it is good that the advantage of anaerobic digestion process comprises (1) treatment effect, the organism that can degrade to greatest extent in mud; (2) dehydration property of digested sludge is good, can greatly reduce sludge volume, realizes minimizing and the stabilization of mud; (3) can supervene high energy biogas, the overall energy consumption of technique is low.
Due to the special property of mud, existing sludge anaerobic zymotechnique ubiquity organic matter in mud flco broken wall difficulty, sludge microbe cell and is difficult to fully be released into the problems such as liquid phase, the organic utilization ratio of mud and methane recovery are low, and be difficult to have breakthrough by regulate and control operation and operation optimization merely, therefore, how mechanism, to improve sludge anaerobic fermenting process creatively, improving mud utilization ratio and methane production, is extensively concerned problem.
Summary of the invention
The object of the invention is to solve organic being difficult in mud flco broken wall difficulty that existing sludge anaerobic zymotechnique exists, sludge microbe cell is fully released into the low technical problem of liquid phase, the organic utilization ratio of mud and methane recovery, provides the method that the mediation of a kind of microorganism electricity promotes anaerobic sludge digestion.
The mediation of microorganism electricity promotes that the method for anaerobic sludge digestion is carried out according to following steps:
One, sludge pretreatment: conditioning of mud concentration, to 14000mg/L, utilizes double-frequency ultrasound to sludge pretreatment 10min, is 10, then refrigerates stand-by by sodium hydroxide solution conditioning of mud pH value;
Two, anode electrolysis flora functional microorganism is tamed: using single chamber MEC reactor as microorganism electrolysis anaerobic acclimation device, fixing additional 0.6 ~ 0.9V micro voltage is added at electrode two ends, cultivate under 30 DEG C of conditions, the single chamber MEC reactor start-up stage, 24h is one-period, and change a subculture at interval of 24h, after single chamber MEC reactor has changed substratum, continue in reaction chamber to pass into 20min purity be 99.998% nitrogen remove residual oxygen, be under the condition of 30 DEG C at acclimation temperature, carry out sequence batch (domestication, detect electric current in the circuit of series connection 10 Ω resistance and reach more than 2.0mA, complete domestication, obtain the microorganism electrode with anode function flora,
Three, the mediation of microorganism electricity promotes anaerobic sludge digestion: with the microorganism electrode in step 2 for anode, being coated with platinum carbon cloth is negative electrode, by underlying with negative electrode for two electrodes, the form that anode is put is inserted in anaerobic digestion reaction vessel, then mud pretreated in step one is joined anaerobic digestion reaction vessel, and interpolation accounts for the fresh sludge of cumulative volume 10% as inoculum, in step one, the volume ratio of pretreated mud and fresh sludge is 10 ﹕ 1, expose to the sun nitrogen 10min, sealing anaerobic digestion reaction vessel, 0.8V micro voltage is added at electrode two ends, control leavening temperature 35 DEG C ~ 38 DEG C, magnetic agitation speed 100rpm/min, ferment 5 ~ 20 days, complete the process that the mediation of microorganism electricity promotes anaerobic sludge digestion.
Utilize double-frequency ultrasound to be carry out in the groove type ultrasonic instrument that the ultrasonic generator that frequency is 28kHz and 40kHz is housed to sludge pretreatment described in step one, the acoustic density of ultrasonic pretreatment is 0.25 ~ 1.0kW/L.
In step 3, electric two interpole gaps are 0.5 ~ 5cm.
In step 3, electrode position is that anode is put, and negative electrode is underlying.
Principle of the present invention:
Because the biodegradability of excess sludge is low, anaerobic digestion completely needs considerable time, the residence time of 20 ~ 30d only can remove the volatile solid (VSS) of 30% ~ 50%, in sewage sludge solid cell disintegration and born of the same parents, biomacromolecule is hydrolyzed to small molecules, is the rate-limiting step of anaerobic digestion.The treatment time of traditional anaerobic digestion process is long, and methane phase process is the process that methanogen floras and fermentation and acid hydrogenogens group cooperate with each other.Anode current transmits bacterium and has similar ecological niche to methanogen, and the inventive method the born of the same parents' exoelectron being attached to electrode surface is transmitted bacterium construct in traditional anaerobic methane production reactor.This kind of born of the same parents' exoelectron propagation function bacterium has the ability of efficient degradation of organic substances, and complex substrate directly can be degraded to electronics and carbonic acid gas.By above putting the embedded structure of the underlying negative electrode of anode, first ensure that methanogen preferentially utilizes the suitableeest substrates such as acetic acid, the complexity of the volatile acid of remaining more than C3 and degraded not yet in effect in the short period of time is organic at positive column, top biological decomposition; Under additional boosting voltage, anode function flora is effectively degraded all kinds of organic acid bioelectronics is delivered to lower cathodic, under the catalyst action of cathode surface by electronics with proton directly in conjunction with generation hydrogen.This process can realize the acceleration of electron transfer process and the further consumption of proton by regulating impressed voltage, reduces acid the suppression, utilizes microorganism electrocatalysis to produce hydrogen for hydrogen nutrition methanogen and provides sufficient hydrogen substrate.
Beneficial effect of the present invention: the mediation of microorganism electricity promotes in the method for anaerobic sludge digestion, electric mediation by biocatalysis electrolytic system has transformed the proton in system faster, Electronically effectively transform complicated Determination of Organic Acids simultaneously, the restraining effect of acid accumulation in elimination system, effectively can promote anaerobic sludge digestion, improve methanogenic velocity ratio and output.After pretreated residue anaerobically fermenting 24h, organic acid reaches 4000mg COD/L, within the 3rd day, is promoted to 6000mg COD/L, and starts methane phase under microorganism electronics mediation, and after stable, peak methane-producing rate is 0.138m
3cH
4/ m
3/ d, improves 3 times than traditional anaerobic fermentation process, and VSS clearance improves 10 ~ 20%.
The inventive method is for promoting anaerobic sludge digestion.
Biocatalysis electrolytic system is coupled with anaerobic system by the technique that the present invention proposes, proton is transformed faster by biocatalysis electrolytic system, Electronically effectively transform complicated Determination of Organic Acids, microorganism electrolysis system effectively can improve the methanogenic speed of mud and output simultaneously.Bioelectrochemical learns a skill and to be combined with traditional technology and can the novel process of avoiding of science to transform with conventional process techniques and conflicting between Xian Yousheshi equipment replacement, can produce larger promoter action under prior art system on the basis retaining original process facility by technique local improvement to sludge treatment effect and energy gain.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram that the mediation of microorganism of the present invention electricity promotes anaerobic sludge digestion, and in figure, 1 represents anode, and 2 represent negative electrode, and 3 represent external circuit, and 4 represent thief hole, and 5 represent agitator, and 6 represent gas collector;
Fig. 2 is embodiment one and the methane accumulation volume of contrast experiment one and the graph of a relation of fermentation time; Wherein
represent the relation curve of methane accumulation volume in contrast experiment one and fermentation time;
with
represent the methane accumulation volume of two groups of parallel laboratory tests in embodiment one and the relation curve of fermentation time respectively.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: the mediation of present embodiment microorganism electricity promotes that the method for anaerobic sludge digestion is carried out according to following steps:
One, sludge pretreatment: conditioning of mud concentration, to 14000mg/L, utilizes double-frequency ultrasound to sludge pretreatment 10min, is 10, then refrigerates stand-by by sodium hydroxide solution conditioning of mud pH value;
Two, anode electrolysis flora functional microorganism is tamed: using single chamber MEC reactor as microorganism electrolysis anaerobic acclimation device, fixing additional 0.6 ~ 0.9V micro voltage is added at electrode two ends, cultivate under 30 DEG C of conditions, the single chamber MEC reactor start-up stage, 24h is one-period, and change a subculture at interval of 24h, after single chamber MEC reactor has changed substratum, continue in reaction chamber to pass into 20min purity be 99.998% nitrogen remove residual oxygen, be under the condition of 30 DEG C at acclimation temperature, carry out sequence batch (domestication, detect electric current in the circuit of series connection 10 Ω resistance and reach more than 2.0mA, complete domestication, obtain the microorganism electrode with anode function flora,
Three, the mediation of microorganism electricity promotes anaerobic sludge digestion: with the microorganism electrode in step 2 for anode, being coated with platinum carbon cloth is negative electrode, by underlying with negative electrode for two electrodes, the form that anode is put is inserted in anaerobic digestion reaction vessel, then mud pretreated in step one is joined anaerobic digestion reaction vessel, and interpolation accounts for the fresh sludge of cumulative volume 10% as inoculum, in step one, the volume ratio of pretreated mud and fresh sludge is 10 ﹕ 1, expose to the sun nitrogen 10min, sealing anaerobic digestion reaction vessel, 0.8V micro voltage is added at electrode two ends, control leavening temperature 35 DEG C ~ 38 DEG C, magnetic agitation speed 100rpm/min, ferment 5 ~ 20 days, complete the process that the mediation of microorganism electricity promotes anaerobic sludge digestion.
In present embodiment step 2, the anode of microorganism electrolysis anaerobic acclimation device is the carbon brush that carbon fiber and titanium silk are formed.
Embodiment two: present embodiment and embodiment one are be carry out in the groove type ultrasonic instrument of the ultrasonic generator of 28kHz and 40kHz being equipped with frequency unlike double-frequency ultrasound described in step one to sludge pretreatment, and the acoustic density of ultrasonic pretreatment is 0.25 ~ 1.0kW/L.Other is identical with embodiment one.
Embodiment three: one of present embodiment and embodiment one or two add additional 0.8V micro voltage unlike electrode two ends in step 2.Other is identical with one of embodiment one or two.
Embodiment four: one of present embodiment and embodiment one to three are painting platinum carbon cloth prepared by conductive carbon cloth unlike negative electrode in step 2 microorganism electrolysis anaerobic acclimation device.Other is identical with one of embodiment one to three.
Embodiment five: one of present embodiment and embodiment one to four are 37 DEG C unlike leavening temperature in step 3.Other is identical with one of embodiment one to four.
Embodiment six: one of present embodiment and embodiment one to five are 6 days unlike fermentation time in step 3.Other is identical with one of embodiment one to five.
Embodiment seven: one of present embodiment and embodiment one to six are 7 days unlike fermentation time in step 3.Other is identical with one of embodiment one to six.
Embodiment eight: one of present embodiment and embodiment one to seven are 8 days unlike fermentation time in step 3.Other is identical with one of embodiment one to seven.
Embodiment nine: one of present embodiment and embodiment one to eight are 0.5 ~ 5cm unlike two interpole gaps electric in step 3.Other is identical with one of embodiment one to eight.
Embodiment ten: one of present embodiment and embodiment one to nine are that anode is put unlike electrode position in step 3, and negative electrode is underlying.Other is identical with one of embodiment one to nine.
Following examples and contrast experiment is adopted to verify beneficial effect of the present invention:
Embodiment one: the mediation of the present embodiment microorganism electricity promotes the method for anaerobic sludge digestion, specifically carries out according to following steps:
One. measure 800ml excess sludge, excess sludge is put into container natural subsidence 24h under temperature is 4 DEG C of conditions, to drain supernatant liquor, by the mud water use regulation concentration that obtains to 14000mg/L, (it is carry out in the groove type ultrasonic instrument of the ultrasonic generator of 28kHz and 40kHz that frequency is housed to utilize double-frequency ultrasound, energy density 0.5kW/L) to sludge pretreatment 10min, be that 10 rear refrigerations are stand-by with sodium hydroxide solution conditioning of mud pH.
Two. the polycarbonate synthetic glass single chamber MEC reactor utilizing volume to be 30ml, in circuit, accessory power supply positive pole connects carbon brush anode, negative pole connects painting platinum carbon cloth negative electrode, the additional 0.8V micro voltage in electrode two ends, cultivate under 30 DEG C of conditions, change domestication device solution with the nutrient solution that sodium acetate is single carbon source after 24 hours, sequence batch (domestication one week, in the load of 10 Ω that connect in testing circuit, electric current reaches more than 2.0mA and is and tames successfully.
Three. to tame successful microorganism anode in step 2 for anode, being coated with platinum carbon cloth is negative electrode, by underlying with negative electrode for two electrodes, the form that anode is put is inserted in the glass anaerobic digestion reaction vessel of 700ml, getting pretreated mud 500ml in step one adds in reactor, and the fresh excess sludge adding 50ml is as inoculum, expose to the sun nitrogen 10min to drive away the dissolved oxygen in mud, sealing anaerobic digestion reaction vessel, electrode two ends apply 0.8V micro voltage, control leavening temperature 35 DEG C ~ 38 DEG C, magnetic agitation speed 100rpm/min, ferment 20 days, complete the anaerobic digestion process of microorganism electricity mediation catalysis.
Wherein mud used takes from the peaceful sewage work in Harbin.
Contrast experiment one:
This contrast experiment, for not applying the method for the anaerobic sludge digestion of microorganism electricity mediation, specifically carries out according to the following steps:
One. measure 800ml excess sludge, excess sludge is put into container natural subsidence 24h under temperature is 4 DEG C of conditions, to drain supernatant liquor, by the mud water use regulation concentration that obtains to 14000mgVSS/L, (it is carry out in the groove type ultrasonic instrument of the ultrasonic generator of 28kHz and 40kHz that frequency is housed to utilize double-frequency ultrasound, energy density 0.5kW/L) to sludge pretreatment 10min, be that 10 rear refrigerations are stand-by with sodium hydroxide solution conditioning of mud pH.
Two. getting pretreated mud 500ml in step one, to add cumulative volume be in the glass anaerobic digestion reaction vessel of 700ml, and the fresh excess sludge adding 50ml is as inoculum, expose to the sun nitrogen 10min to drive away the dissolved oxygen in mud, sealed reactor, control leavening temperature 35 DEG C ~ 38 DEG C, magnetic agitation speed 100rpm/min, ferments 20 days, completes the anaerobic sludge digestion process without microorganism electricity mediation catalysis.
Wherein used mud takes from the peaceful sewage work in Harbin.
In embodiment one, within 24th hour, microorganism electrocatalysis accelerating system makes volatile acid concentration reach 4100mg COD/L under lasting micro voltage, increase the 20%, 3rd day accelerating system volatile acid production peak than contrast experiment one volatile acid accumulation volume and can reach 6500mg COD/L, start methane phase simultaneously.Fig. 2 is embodiment one and the methane accumulation volume of contrast experiment one and the graph of a relation of fermentation time, and in embodiment one, after sludge stabilization methane phase, the highest methane production reaches 0.138m as seen from the figure
3cH
4/ m
3reactor/d, increases 3 times than traditional anaerobic fermentation process.Aerogenesis 10 days (10 to 20 days) Promotion systems finally add up methane production and improve 3 times than traditional anaerobically fermenting, and VSS clearance improves 10-20%.
Claims (7)
1. the mediation of microorganism electricity promotes the method for anaerobic sludge digestion, it is characterized in that the mediation of microorganism electricity promotes that the method for anaerobic sludge digestion is carried out according to following steps:
One, sludge pretreatment: conditioning of mud concentration, to 14000mg/L, utilizes double-frequency ultrasound to sludge pretreatment 10min, is 10, then refrigerates stand-by by sodium hydroxide solution conditioning of mud pH value;
Two, the microorganism electrode preparation of anode function flora: using single chamber MEC reactor as microorganism electrolysis anaerobic acclimation device, fixing additional 0.6 ~ 0.9V micro voltage is added at electrode two ends, cultivate under 30 DEG C of conditions, the single chamber MEC reactor start-up stage, 24h is one-period, and change a subculture at interval of 24h, after single chamber MEC reactor has changed substratum, continue in reaction chamber to pass into 20min purity be 99.998% nitrogen remove residual oxygen, be under the condition of 30 DEG C at acclimation temperature, carry out sequence batch (domestication, detect electric current in the circuit of series connection 10 Ω resistance and reach more than 2.0mA, complete domestication, obtain the microorganism electrode with anode function flora,
Three, the mediation of microorganism electricity promotes anaerobic sludge digestion: with the microorganism electrode in step 2 for anode, being coated with platinum carbon cloth is negative electrode, by underlying with negative electrode for two electrodes, the form that anode is put is inserted in anaerobic digestion reaction vessel, then mud pretreated in step one is joined anaerobic digestion reaction vessel, and interpolation accounts for the fresh sludge of cumulative volume 10% as inoculum, in step one, the volume ratio of pretreated mud and fresh sludge is 10 ﹕ 1, expose to the sun nitrogen 10min, sealing anaerobic digestion reaction vessel, 0.8V micro voltage is added at electrode two ends, control leavening temperature 35 DEG C ~ 38 DEG C, magnetic agitation speed 100rpm/min, ferment 5 ~ 20 days, complete the process that the mediation of microorganism electricity promotes anaerobic sludge digestion,
Double-frequency ultrasound described in step one is be carry out in the groove type ultrasonic instrument of the ultrasonic generator of 28kHz and 40kHz being equipped with frequency to sludge pretreatment, and the acoustic density of ultrasonic pretreatment is 0.25 ~ 1.0kW/L.
2. the mediation of microorganism electricity promotes the method for anaerobic sludge digestion according to claim 1, it is characterized in that in step 2, fixing additional 0.8V micro voltage is added at electrode two ends.
3. the mediation of microorganism electricity promotes the method for anaerobic sludge digestion according to claim 1, it is characterized in that in step 3, leavening temperature is 37 DEG C.
4. the mediation of microorganism electricity promotes the method for anaerobic sludge digestion according to claim 1, it is characterized in that in step 3, fermentation time is 6 days.
5. the mediation of microorganism electricity promotes the method for anaerobic sludge digestion according to claim 1, it is characterized in that in step 3, fermentation time is 7 days.
6. the mediation of microorganism electricity promotes the method for anaerobic sludge digestion according to claim 1, it is characterized in that in step 3, fermentation time is 8 days.
7. the mediation of microorganism electricity promotes the method for anaerobic sludge digestion according to claim 1, it is characterized in that in step 3, two interelectrode distances are 0.5 ~ 5cm.
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| CN102718381B (en) * | 2012-07-12 | 2013-12-25 | 哈尔滨工业大学 | Method for realizing methanogenesis with surplus sludge by utilizing microbial electrolytic tank |
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