CN101805753A - Method of producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes - Google Patents
Method of producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes Download PDFInfo
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The invention provides a method for producing biogas through high-solid two-phase three-stage anaerobic digestion by using perishable organic wastes, which comprises the following steps: the perishable organic wastes are hydrolyzed in a hydrolysis acidogenic reactor, and a mixture obtained after hydrolysis is acidified to generate a large number of organic acid products with low molecular weight; the bottom of the hydrolysis acidogenic reactor is communicated with the bottom of a methanogenic reactor through a circulation pump and a pipeline; the top of the methanogenic reactor is communicated with the top of the hydrolysis acidogenic reactor; and the acetic acid producing reaction is carried out in the methanogenic reactor and the methane producing reaction is continuously carried out. The invention can separate the hydrolysis acidogenic process from the acetic acid and methane producing process in the anaerobic digestion process so as to prevent organic acids generated by the perishable organic wastes from inhibiting methanogenesis. The device has simple processing procedure, low cost, easy maintenance and stable and reliable performance, is suitable for anaerobic digestion treatment of various perishable organic wastes, and has highly efficient and stable biogas production capacity of the perishable organic wastes through the anaerobic digestion.
Description
Technical field
The present invention relates to a kind for the treatment of method for organic refuse, more particularly, the present invention relates to a kind of is the method for three sections anaerobic digestion methane productions of high solid two-phase of raw material with the perishable organic wastes.
Technical background
Perishable organic wastes mainly refer to live and production process in produce the waste of easily corrupt and readily biodegradable, comprise rubbish from cooking, hogwash, vegetables, fruit and meat processing waste etc.Because quickening of urbanization process and growth in the living standard, perishable organic wastes not only significantly increases on absolute yield, and also significantly raising of the shared ratio in domestic waste, this part rubbish accounts for more than 50% of domestic waste total amount at present.The characteristics of perishable organic wastes maximum are that moisture content and organic content are higher, and moisture content is generally more than 70%, organic content in butt generally more than 90%.These characteristics makes present main cities domestic rubbish disposal technology all have some problems, for example, cause producing in the landfill process in a large number can polluted underground water and the greenhouse gases methane of edaphic percolate and unordered discharging for higher organic content; And higher moisture content need be added a large amount of extra auxiliary fuels when causing burning disposal.In fact, sanitary landfill of today is had relatively high expectations to addressing, and occupation of land face ground is bigger, in many big cities, has been difficult to find the place that is fit to sanitary landfill; For burning disposal, owing to there is secondary pollution problems, government and street levels is also held careful attitude to burning disposal at present.Therefore, press for a kind of new non-secondary pollution of exploitation and the little processing mode of floor space.Effective processing to perishable organic wastes can make a significant contribution for garbage treatment.The characteristics of high moisture content and high organic content make that perishable organic wastes is more suitable for carrying out Anaerobic Digestion, and can obtain clean reproducible energy (biogas) in treating refuse.
Organic matter anaerobic digestion product methane process comprises 4 steps: the outer hydrolysis of born of the same parents, product acid, product acetate and product methane.The outer hydrolysing step of born of the same parents refers to be monose, amino acid, glycerine and longer chain fatty acid with polysaccharide, starch, food fibre, protein and hydrolysis of lipid under poly carbohydrase, amylase, cellulase, protein enzyme and action of lipase; Produce the micromolecular compound that sour step refers to that hydrolysis produces and under the effect of acid-producing bacteria, be decomposed into simpler acetate, propionic acid, butyric acid, pyruvic acid, lactic acid, valeric acid, ethanol and a spot of carbonic acid gas and hydrogen; Produce organic acid product (except that acetate) that the acetate step refers to produce sour step and further be converted into the process of acetate, carbonic acid gas and hydrogen; Produce the methane step and refer to that acetate generates the process of methane and carbonic acid gas and carbonic acid gas and hydrogen generation methane through acetate nutritional type methanogen.The anaerobic digestion product methane technology of efficient stable need guarantee the balance between hydrolysis acid process and the product acetic acid and methane producing process, the small molecular organic acid that the hydrolysis acid process produces can in time be produced the utilization of methane process, thereby avoid the organic acid accumulation to suppress the interior microorganism of fermentation system, especially to the inhibition of methanogen, because methanogen is lower to organic acid tolerance concentration, when being accumulated to 13000mg/L, organic acid concentration will suppress methanogenesis activity fully.
The perishable organic wastes main component is polysaccharide, starch, food fibre, protein, they belong to the material of easy acidication, the hydrolysis rate of producing acid is very fast in anaerobic digestion process, by comparison, producing the methane process is the rate-limiting step of whole anaerobic digestion process, is easy to generate organic acid when causing perishable organic wastes to carry out Anaerobic Digestion and suppresses.Suppress for fear of organic acid, traditional single-phase anaerobic digestion can only be finished under lower fermentation raw material concentration (being lower than 4%), and for the perishable organic wastes as this class of rubbish from cooking, its total solids level is generally 15% ~ 25%.At this moment, not only need to consume a large amount of water and be used to turn down material concentration, and lower material concentration greatly reduces perishable organic wastes Anaerobic Digestion efficient and produces the biogas ability.Therefore, exploitation unrestraint efficient anaerobic digestion process for producing biogas becomes the key of perishable organic wastes minimizing and energy processing.
Summary of the invention
Main purpose of the present invention is to overcome deficiency of the prior art, and providing a kind of is the method for three sections anaerobic digestion methane productions of high solid two-phase of raw material with the perishable organic wastes, to improve anaerobic digestion stability, processing efficiency and to produce the biogas ability.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The technical process of the inventive method may further comprise the steps:
(1) in hydrolysis acidogenic reactor with the perishable organic wastes hydrolysis, generate carbohydrate, amino acid, longer chain fatty acid and the glycerine of solubility; And, generate a large amount of small molecular organic acid products with the mixture acidifying that obtains after the said hydrolyzed; Hydrolysis acidogenic reactor adopts solid diafiltration bed, perishable organic wastes fills in above the diafiltration filler of diafiltration bed, the water that comes from spray header carries out sprinkle to perishable organic wastes, the organic acid that the acid-producing of hydrolysis simultaneously generates is soluble in water, and stores in the hydrolysis acidogenic reactor bottom through diafiltration filler and porous plate formation percolate;
Preferred processing condition is in the step (1):
With perishable organic wastes hydrolysis under the condition of raw material solid concentration 15% ~ 40%, 25 ℃ ~ 60 ℃ of temperature, pH value 4.5 ~ 6.5, generate carbohydrate, amino acid, longer chain fatty acid and the glycerine of solubility;
With the mixture acidifying under the condition of 25 ℃ ~ 60 ℃ of temperature, pH value 4.5 ~ 6.5 that obtains after the said hydrolyzed, generate a large amount of small molecular organic acid products, comprise pyruvic acid, acetate, propionic acid, butyric acid, valeric acid, lactic acid, ethanol, and small quantity of hydrogen and carbonic acid gas.
(2) hydrolysis acidogenic reactor bottom and methane-producing reactor bottom are communicated with by recycle pump and pipeline; Methane-producing reactor top and hydrolysis acidogenic reactor top are communicated with; Produce acetic acidreaction in methane-producing reactor, the organic acid product except that acetate that step (1) acidifying is produced generates acetate, hydrogen and carbonic acid gas under the effect of acetogen; And proceed to produce methane reaction, and acetate is generated methane and carbonic acid gas at the effect bottom fermentation of acetate nutritional type methanogen, hydrogen and carbonic acid gas are generated methane at the effect bottom fermentation of hydrogen nutritional type methanogen; The main body of methane-producing reactor is the fibrous packing bed bioreactor on top, and fibrous packing can be adhered to acetogen and methanogen, improves the concentration of interior acetogen of methane-producing reactor and methanogen, produces the biogas performance thereby improve; The methane-producing reactor bottom is provided with filter bed, is used for holding back the particulate organic matter of percolate, avoids stopping up the fibrous packing bed; When the percolate that step (1) produces was flowed through methane-producing reactor, the organic acid in the percolate generated methane and carbonic acid gas under the serial action of acetogen and methanogen;
The preferred processing condition of step (2) is:
The organic acid product except that acetate that step (1) acidifying is produced generates acetate, hydrogen and carbonic acid gas under the effect of acetogen, this reaction control temperature is 25 ℃ ~ 60 ℃, pH value 6.5 ~ 8.0.
Gained acetate generates methane and carbonic acid gas at the effect bottom fermentation of acetate nutritional type methanogen, hydrogen during previous step is rapid and carbonic acid gas generate methane at the effect bottom fermentation of hydrogen nutritional type methanogen, the equal controlled temperature of product methane reaction that this two classes methanogen participates in is 25 ℃ ~ 60 ℃, pH value 6.5 ~ 8.0.
(3) regularly remove part perishable organic wastes hydrolytic residue, effectively handle volume to improve reactor from the discharge opening of hydrolysis acidogenic reactor; Regularly remove perishable organic wastes percolate throw out, effectively store volume to improve percolate from the slag-drip opening of hydrolysis acidogenic reactor; Routine cleaning is laid equal stress on and is newly loaded the filter packing in the filter bed in the methane-producing reactor, guarantees good filter effect.
The time of general periodic cleaning is:
Removed part perishable organic wastes hydrolytic residue every 10 days ~ 60 days from the discharge opening of hydrolysis acidogenic reactor, effectively handle volume to improve reactor; Removed perishable organic wastes percolate throw out every 30 days ~ 90 days from the slag-drip opening of hydrolysis acidogenic reactor, effectively store volume to improve percolate; Clean the filter packing in the filter bed in the new filling methane-producing reactor of laying equal stress on every 30 days ~ 90 days, guarantee good filter effect.
Further improvement of the present invention is:
The hydrolysis acidogenic reactor bottom links to each other by recycle pump and pipeline with the methane-producing reactor bottom, and described pump entry section is provided with branch line, is used for adding anaerobic digestion inoculum, acid-base modifier and water etc. to methane-producing reactor.When methane-producing reactor operation appearance is unusual, specifically, when methane-producing reactor mild or moderate peracid or mistake alkali, can regulate by the internal circulating load of control percolate; When serious peracid in the methane-producing reactor or mistake alkali, can pump into acidity-basicity regulator from the branch line of pump entry section to regulate potential of hydrogen.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention can separate the hydrolysis acid process (sour phase is produced in hydrolysis) of anaerobic digestion process with product acetic acid and methane producing process (producing methane mutually), the organic acid of avoiding perishable organic wastes to produce suppresses methanogenesis.Hydrolysis is produced acid and is adopted high solid diafiltration bed bioreactor mutually, can make perishable organic wastes at higher material concentration bottom fermentation, and material concentration reaches as high as 40%, therefore, need not additionally to add a large amount of water and is used to turn down material concentration.In addition, the water that is used for the sprinkle perishable organic wastes in solid diafiltration bed bioreactor comes from methane-producing reactor, water in the total system can be realized self-circulation, and therefore, this invention is a water saving type perishable organic wastes anaerobic digestion methane production treatment unit.Filler in the methane-producing reactor in the fibrous packing bed can adhere to methanogen, improves the cell concn of methanogen in the reactor, thereby improves the anaerobic digestion methane production ability.Percolate enters before the fibrous packing bed, and the particulate organic matter of the setting of filter bed in can the effectively catching percolate is to avoid stopping up the fibrous packing bed.The filter packing entrance and exit is set on filter bed, can lays equal stress on new filling filter packing to guarantee good filter effect by routine cleaning.Compare with the single-phase anaerobic digestion device of traditional perishable organic wastes, adopt this contrive equipment can significantly improve the concentration of treatment of perishable organic wastes anaerobic digestion, high energy brings up to 40% from 4%, and the pond holds produces the high energy of biogas rate from 0.8m
3/ (m
3D) bring up to 2.5m
3/ (m
3And can effectively avoid the inhibition of organic acid d), to methanogenesis.
The inventive method process operating management is simple, and anaerobic digestion methane production is stable and reliable for performance.Be applicable to the Anaerobic Digestion of all kinds of perishable organic wastes, both can efficiently handle organic waste, reduce its severe contamination, can produce clean reproducible energy (biogas) again environment, can realize the recovery energy of organic waste, thereby turn waste into wealth.
The present invention has the perishable organic wastes anaerobic digestion methane production ability of efficient stable, be fit to very much rubbish from cooking processing field, hogwash processing enter and fruit, vegetables and meat packing plant etc. and carry out application, have good economy, environment and social benefit.
Description of drawings
Fig. 1 is the inventive method schema.
Reference numeral: hopper 1, hydrolysis acidogenic reactor 2, methane-producing reactor 3, recycle pump 4, water distributor 5, spray header 6, opening for feed 7, porous plate 8, discharge opening 9, slag-drip opening 10, diafiltration filler 11, filter bed 12, fibrous packing bed 13, filter packing 14, fibrous packing frame 15, fibrous packing 16, filter packing inlet 17, filter packing outlet 18, gas discharge outlet 19, safety valve 20, tensimeter 21, gas discharge outlet is provided with under meter 22 respectively, heat chuck 23, thermal insulation layer 24, temperature/acidometer 25, thief hatch 26, branch line 27.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
The main component of perishable organic wastes is polysaccharide, starch, food fibre, protein and lipid, and the anaerobic digestion product methane process of this class raw material comprises 4 steps: the outer hydrolysis of born of the same parents, product acid, product acetate and product methane.The outer hydrolysing step of born of the same parents refers to be monose, amino acid, glycerine and longer chain fatty acid with polysaccharide, starch, food fibre, protein and hydrolysis of lipid under poly carbohydrase, amylase, cellulase, protein enzyme and action of lipase; Produce the micromolecular compound that sour step refers to that hydrolysis produces and under the effect of acid-producing bacteria, be decomposed into simpler acetate, propionic acid, butyric acid, pyruvic acid, lactic acid, valeric acid, ethanol and a spot of carbonic acid gas and hydrogen; Produce organic acid product (except that acetate) that the acetate step refers to produce sour step and further be converted into the process of acetate, carbonic acid gas and hydrogen; Produce the methane step and refer to that acetate generates the process of methane and carbonic acid gas and carbonic acid gas and hydrogen generation methane through acetate nutritional type methanogen.
The microorganism type that participates in above-mentioned whole process comprises hydrolysis acid-producing bacteria, acetogen and methanogen, wherein the hydrolysis acid-producing bacteria can be secreted the outer lytic enzyme of born of the same parents and carries out the raw material hydrolysis, and with hydrolysate fermentation generation organic acid, methanogen comprises acetate nutritional type methanogen and hydrogen nutritional type methanogen.Derive from the anaerobic activated sludge that methane-generating pit or municipal wastewater treatment plant etc. locate, generally all contain the microorganism of the above-mentioned type, therefore usually with the inoculum of this class anaerobic activated sludge as anaerobic digestion methane production.But the physiological property of hydrolysis acid-producing bacteria and methanogen is inequality, and the pH value scope that hydrolysis acid-producing bacteria growth metabolism allows is wider, be 4.5 ~ 9.0, and the growth velocity of this bacterium is very fast, is generally its generation time 10 ~ 30 minutes; And the pH scope that the methanogen growth metabolism allows is narrower, be 6.5 ~ 8.0, and growth velocity is slower, and its generation time is generally at 4 ~ 6 days.The present invention is in view of above characteristics, the hydrolysis acid process and the product methane process of perishable organic wastes are finished in two reactors respectively, and to the operation pH independent control of two reactors, avoid hydrolysis to produce the high density organic acid inhibition methanogen that acid generates on the one hand, be convenient on the other hand two process independent optimization controls.Simultaneously, adopt the fibrous packing bed,, improve the concentration of this two bacterioid in the methane-producing reactor, thereby improve the anaerobic digestion methane production performance by the absorption of fibrous packing to acetogen and methanogen as methane-producing reactor.
The operational process of technology is as follows in the present embodiment:
The present embodiment using appts is seen Fig. 1, during startup, add a spot of perishable organic wastes from hopper 1 to hydrolysis acidogenic reactor 2, and inoculation liquid pumped into methane-producing reactor 3 from the branch line 27 of recycle pump 4 entrances, after treating that inoculation liquid is flooded fibrous packing, continue to pump into inoculation liquid until form the perishable organic wastes percolate in hydrolysis acidogenic reactor 2 bottoms, and the percolate height is during near porous plate 8, the valve of close fork pipeline 27 stops to pump into inoculation liquid, so far finishes the interpolation of inoculation liquid.Subsequently, percolate is pumped into methane-producing reactor 3 from hydrolysis acidogenic reactor 2 bottoms by recycle pump 4, and the liquid in the methane-producing reactor 3 is from the 13 top overflows of fibrous packing bed to hydrolysis acidogenic reactor 2, and carry out sprinkle by water distributor 5 and 6 pairs of perishable organic wastes of spray header, the organic acid that the liquid dissolving perishable organic wastes hydrolysis acid process that sprinkle gets off produces, and diafiltration filler 11 and the porous plate 8 of flowing through form percolates and be stored in hydrolysis acidogenic reactor 2 bottoms, so far finishes a liquid circulation.Finish the domestication of methanogen and adhering to and grow on fibrous packing 16 thereof through a kind of like this circulation repeatedly.After domestication is finished, progressively add perishable organic wastes, until the loading height of perishable organic wastes position near opening for feed 7.When progressively adding perishable organic wastes, increase the liquid circulation number of times, until continuous circulation, finally realize the normal continuously operation of this contrive equipment.
Described inoculation liquid is the anaerobic activated sludge that methane-generating pit or municipal wastewater treatment plant etc. locate.
Embodiment 1
(1) add a spot of rubbish from cooking from hopper 1 to hydrolysis acidogenic reactor 2, and control hydrolysis acidogenic reactor 2 temperature is 37 ℃.
(2) anaerobic activated sludge in the collection methane-generating pit, pump into methane-producing reactor 3 by branch line 27, after treating that anaerobic activated sludge floods fibrous packing 16, continue to pump into anaerobic activated sludge until form the rubbish from cooking percolate in hydrolysis acidogenic reactor 2 bottoms, and the percolate height is during near porous plate 8, the valve of close fork pipeline 27 stops to pump into anaerobic activated sludge, and the temperature of said process control methane-producing reactor 3 is 37 ℃.
(3) in the hydrolysis acidogenic reactor in the said process, rubbish from cooking generates acetate, propionic acid, butyric acid, valeric acid, pyruvic acid, lactic acid, ethanol and amounts of carbon dioxide and hydrogen under the effect of hydrolysis acid-producing bacteria in anaerobic activated sludge, wherein carbonic acid gas and hydrogen are discharged from the venting port 19 at hydrolysis acidogenic reactor 2 tops, and organic acid is dissolved in the percolate.Hydrolysis acid production controlled temperature is 37 ℃, and pH is 5.5.
(4) above-mentioned percolate is pumped into methane-producing reactor 3 through recycle pump 4, in methane-producing reactor 3, organic acid in the percolate generates methane and carbonic acid gas under the serial action of acetogen and methanogen, methane and carbonic acid gas are discharged from the venting port at methane-producing reactor 3 tops, and the percolate after organic acid is utilized flow to hydrolysis acidogenic reactor 2 from the overflow port at methane-producing reactor 3 tops.Producing acetate and methanogenesis controlled temperature is 37 ℃, and control pH is 7.2.
Produce acetate and carry out in methane-producing reactor 3 with the product methane reaction, methane-producing reactor 3 is divided into filter bed 12 and fibrous packing bed 13 from bottom to up, and filter bed 12 is held back the particulate organic matter in the percolate, avoids stopping up fibrous packing bed 13.Fibrous packing 16 in the fibrous packing bed 13 can be adhered to acetogen and methanogen, improves the concentration of this two bacterioid in the methane-producing reactor 3, thereby improves the anaerobic digestion methane production performance.
(5), finish the domestication of methanogen in the methane-producing reactor 3 and adhering to and grow on fibrous packing 16 thereof through 10 days percolate circulation repeatedly.The temperature of control hydrolysis acidogenic reactor 2 is 37 ℃ in this process, and pH is 5.5; The temperature of control methane-producing reactor 3 is 37 ℃, and pH is 7.2.
(6) after domestication is finished, progressively add rubbish from cooking, until the loading height of rubbish from cooking position near hydrolysis acidogenic reactor 2 opening for feeds 7.When progressively adding rubbish from cooking, increase the percolate cycle index, until continuous circulation, finally realize the normal continuously operation of this technology.The temperature of control hydrolysis acidogenic reactor 2 is 37 ℃ in this process, and pH is 5.5; The temperature of control methane-producing reactor 3 is 37 ℃, and pH is 7.2.
(7) after the normal operation,, remove part rubbish from cooking hydrolytic residue from the discharge opening 9 of hydrolysis acidogenic reactor 2 every 30 days.
(8) after the normal operation,, remove rubbish from cooking percolate throw out from the slag-drip opening 10 of hydrolysis acidogenic reactor 2 every 50 days; Every 50 days, discharge filter packings 14 from the filter packing of filter bed 12 outlet 18 and clean, and enter the mouth from filter packing and 17 to load again.
Embodiment 2
The step of present embodiment is identical with embodiment 1, and wherein handling raw material is meat processing rubbish, and
The temperature of control methane-producing reactor 3 is 25 ℃ in the step (2); Hydrolysis acid production control pH is 6.5 in the step (3); Product acetate and methanogenesis controlled temperature are 25 ℃ in the step (4), and control pH is 8.0; Through 20 days percolate circulation repeatedly, the temperature of control hydrolysis acidogenic reactor 2 was 25 ℃ in the step (5), and pH is 6.5; The temperature of methane-producing reactor is 25 ℃, and pH is 8.0; The temperature of control hydrolysis acidogenic reactor is 25 ℃ in the step (6), and pH is 6.5, and the temperature of methane-producing reactor is 25 ℃, and pH is 8.0; Removed part meat processing rubbish hydrolytic residue in the step (7) every 40 days; Every 60 days, remove the percolate throw out in the step (8); Every 60 days, clean the filter packing 14 in the new filling filter bed 12 of laying equal stress on.
Embodiment 3
The step of present embodiment is identical with embodiment 1, and wherein handling raw material is vegetables processing rubbish, and
The temperature of control hydrolysis acidogenic reactor 2 is 60 ℃ in the step (1); The temperature of control methane-producing reactor 3 is 60 ℃ in the step (2); Hydrolysis acid production controlled temperature is 60 ℃ in the step (3), and pH is 4.5; Product acetate and methanogenesis controlled temperature are 60 ℃ in the step (4), and pH is 6.5; Through 15 days percolate circulation repeatedly, the temperature of control hydrolysis acidogenic reactor 2 was 60 ℃ in the step (5), and pH is 4.5; The temperature of methane-producing reactor 3 is 60 ℃, and pH is 6.5; The temperature of control hydrolysis acidogenic reactor 2 is 60 ℃ in the step (6), and pH is 4.5; The temperature of methane-producing reactor 3 is 60 ℃, and pH is 6.5; Remove the part vegetables every 20 days in the step (7) and process the rubbish hydrolytic residue; Every 40 days, remove the percolate throw out in the step (8); Every 40 days, clean the filter packing 14 in the new filling filter bed 12 of laying equal stress on.
Compare with traditional low single-phase anaerobic digestion methane production method of solids concn of perishable organic wastes, the present invention can handle perishable organic wastes under up to 40% condition in raw material solid concentration, and the hydrolysis acid process (sour phase is produced in hydrolysis) of anaerobic digestion process is separated with product acetic acid and methane producing process (producing methane mutually), and be provided with two sections mutually producing methane, be filter bed and fibrous packing bed, the perishable organic wastes energy treatment process that three sections anaerobic digestion methane production technologies of this high solid two-phase are a kind of efficient stables.Adopt this invention can significantly improve the concentration of treatment of perishable organic wastes anaerobic digestion, high energy brings up to 40% with raw material solid concentration from 4%, and high energy holds the pond and produces the biogas rate from 0.8m
3/ (m
3D) bring up to 2.5m
3/ (m
3And can effectively avoid the inhibition of organic acid d), to methanogenesis.
At last, it is also to be noted that what more than enumerate only is specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (4)
1. the method for three sections anaerobic digestion methane productions of a perishable organic wastes high solid two-phase is characterized in that may further comprise the steps:
(1) in hydrolysis acidogenic reactor with the perishable organic wastes hydrolysis, generate carbohydrate, amino acid, longer chain fatty acid and the glycerine of solubility; And, generate a large amount of small molecular organic acid products with the mixture acidifying that obtains after the said hydrolyzed; Hydrolysis acidogenic reactor adopts solid diafiltration bed, perishable organic wastes fills in above the diafiltration filler of diafiltration bed, the water that comes from spray header carries out sprinkle to perishable organic wastes, the organic acid that the acid-producing of hydrolysis simultaneously generates is soluble in water, and stores in the hydrolysis acidogenic reactor bottom through diafiltration filler and porous plate formation percolate;
(2) hydrolysis acidogenic reactor bottom and methane-producing reactor bottom are communicated with by recycle pump and pipeline; Methane-producing reactor top and hydrolysis acidogenic reactor top are communicated with; Produce acetic acidreaction in methane-producing reactor, the organic acid product except that acetate that step (1) acidifying is produced generates acetate, hydrogen and carbonic acid gas under the effect of acetogen; And proceed to produce methane reaction, and acetate is generated methane and carbonic acid gas at the effect bottom fermentation of acetate nutritional type methanogen, hydrogen and carbonic acid gas are generated methane at the effect bottom fermentation of hydrogen nutritional type methanogen; The main body of methane-producing reactor is the fibrous packing bed bioreactor on top, and fibrous packing can be adhered to acetogen and methanogen, improves the concentration of interior acetogen of methane-producing reactor and methanogen, produces the biogas performance thereby improve; The methane-producing reactor bottom is provided with filter bed, is used for holding back the particulate organic matter of percolate, avoids stopping up the fibrous packing bed; When the percolate that step (1) produces was flowed through methane-producing reactor, the organic acid in the percolate generated methane and carbonic acid gas under the serial action of acetogen and methanogen;
(3) regularly remove part perishable organic wastes hydrolytic residue, effectively handle volume to improve reactor from the discharge opening of hydrolysis acidogenic reactor; Regularly remove perishable organic wastes percolate throw out, effectively store volume to improve percolate from the slag-drip opening of hydrolysis acidogenic reactor; Routine cleaning is laid equal stress on and is newly loaded the filter packing in the filter bed in the methane-producing reactor, guarantees good filter effect.
2. the method for three sections anaerobic digestion methane productions of perishable organic wastes high solid two-phase as claimed in claim 1, it is characterized in that further comprising the steps of: described pump entry section is provided with branch line; When methane-producing reactor mild or moderate peracid or mistake alkali, regulate by the internal circulating load of control percolate; When serious peracid in the methane-producing reactor or when crossing alkali, pump into acidity-basicity regulator to regulate potential of hydrogen from the branch line of pump entry section.
3. the method for three sections anaerobic digestion methane productions of perishable organic wastes high solid two-phase as claimed in claim 1, it is characterized in that in the described step (1) perishable organic wastes hydrolysis under the condition of raw material solid concentration 15% ~ 40%, 25 ℃ ~ 60 ℃ of temperature, pH value 4.5 ~ 6.5, generate carbohydrate, amino acid, longer chain fatty acid and the glycerine of solubility; With the mixture acidifying under the condition of 25 ℃ ~ 60 ℃ of temperature, pH value 4.5 ~ 6.5 that obtains after the said hydrolyzed, generate a large amount of small molecular organic acid products, comprise pyruvic acid, acetate, propionic acid, butyric acid, valeric acid, lactic acid, ethanol, and small quantity of hydrogen and carbonic acid gas.
4. the method for three sections anaerobic digestion methane productions of perishable organic wastes high solid two-phase as claimed in claim 1, it is characterized in that the organic acid product except that acetate that in the described step (2) step (1) acidifying is produced generates acetate, hydrogen and carbonic acid gas under the effect of acetogen, this reaction control temperature is 25 ℃ ~ 60 ℃, pH value 6.5 ~ 8.0; Gained acetate generates methane and carbonic acid gas at the effect bottom fermentation of acetate nutritional type methanogen, hydrogen during previous step is rapid and carbonic acid gas generate methane at the effect bottom fermentation of hydrogen nutritional type methanogen, the equal controlled temperature of product methane reaction that this two classes methanogen participates in is 25 ℃ ~ 60 ℃, pH value 6.5 ~ 8.0.
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