CN104928325A - Anaerobic digestion treatment process of organic waste - Google Patents
Anaerobic digestion treatment process of organic waste Download PDFInfo
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- CN104928325A CN104928325A CN201510412468.6A CN201510412468A CN104928325A CN 104928325 A CN104928325 A CN 104928325A CN 201510412468 A CN201510412468 A CN 201510412468A CN 104928325 A CN104928325 A CN 104928325A
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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
Abstract
The invention discloses an anaerobic digestion treatment process of organic waste. The anaerobic digestion treatment process includes the steps that the organic waste is pre-treated into small sections which are 55-70 mm in length, and enters a one-phase digestion reactor to be treated under a certain condition, and residues and acid are obtained and enter a two-phase digestion reactor to be treated, methane and residues are obtained, extraction and solid-liquid separation are conducted on the residues, and methane residues and methane liquid are obtained. The treatment process is a dry method anaerobic digestion treatment process, treatment procedures are simple in operation, water does not need to be added, water resources are saved, energy consumption is low, and more reusable energy methane can be generated.
Description
Technical field
The present invention relates to a kind for the treatment of process of waste, particularly, relate to a kind of Anaerobic Digestion technique of organic waste.
Background technology
Along with the quickening of Urbanization Process In China, China's domestic waste annual growth reaches more than 10%.Current trash processing way mainly landfill, small part compost and burning.According to Chinese practice national conditions and the awareness of the obligations of citizens, rubbish also cannot realize at present from original-source by classification, and various rubbish mixes collection, causes in domestic waste and there is organic waste in a large number.Organic waste water content is high, organic content is high, fat content and salt content high, hazardous and noxious substances (as heavy metal etc.) content is few, but the speed that rots is fast, easily grow bacterium, particularly summer is perishable rotten, causes the rapid amount reproduction of the objectionable impuritiess such as pathogenic micro-organism.Therefore, if organic waste can not get dealing carefully with, disadvantageous effect will be caused to environmental and human health impacts.In addition, the waste that agriculture production, processing produce, as stalk, fruit/vegetable waste etc. also belong to organic waste.The process of stalk is most mode adopting on-site incineration also field at present.Open Burning Crop Residue, discharges a large amount of toxic gases, is the one of the main reasons causing haze weather.
Wet method anaerobic ferment process is used successfully to build many biogas plants in some enviromental protection enterprises of China at present.Organism in domestic refuse and other organic waste (sewage treatment plant residual mud, changing food waste, ight soil etc.) by sending anaerobic fermentation tank after pre-treatment to, are carried out anaerobic fermentation by this technique.By controlling the reaction times of mixture, in treating processes, produce a large amount of biogas and organic fertilizer, thus reach the object reducing organic content in domestic refuse and organic waste.The solid rate general control entering the material of digester at 10%DS hereinafter referred to as wet digesting.But generally, enter the solid rate of the organic materials of digester 20 ~ 30%, especially some agricultural wastes is as stalk, and solid rate reaches more than 50%.If meet the digestive organ feed needs of 10%DS, just must add a large amount of water to dilute.Some municipal sludges reach 20%DS through dehydration when dispatching from the factory, but wet digesting in order to carry out, and the water that also will add one times dilutes, and this just causes a large amount of wastes of the energy and water resources.Simultaneously because the methanogen of anaerobic digestion process could will survive at suitable temperature, this just requires the temperature that digestive organ keeps certain, and thin up obviously can consume more multiple-energy-source (electricity or steam) and makes digestive organ keep the microbe survival temperature of this necessity.
Therefore research is applicable to the main task that high solids content organic dry method anaerobic digestion techniques is current organic waste treatment field.
Summary of the invention
The object of this invention is to provide a kind of Anaerobic Digestion technique of organic waste, this treatment process can directly process the material of solid rate more than 30% by dry method digestion techniques by change processing unit and treatment condition, without the need to thin up, there is saving water resource, consume energy low, simple operation and other advantages.
To achieve these goals, the invention provides a kind of Anaerobic Digestion technique of organic waste, this technique comprises the following steps: organic waste pre-treatment becomes length to be after the segment of 55-70 millimeter by (1), enters into a cancellation ratio reactor by feeder; (2) treatment condition of organic waste in a cancellation ratio reactor comprise: add alkaline matter or do not add, and agitator stirring frequency is 90-130 rev/min, generate acid and leftover materials after processing 1-4 days under the effect of extracellular enzyme and acid-producing bacteria; (3) acid obtained in step (2) and leftover materials are passed in two-phase digestion reactor, treatment condition comprise: agitator stirring frequency is 1-8 rev/min, treatment temp is 48-55 DEG C, produces biogas and resistates under the effect of methanobacteria after processing 20-30 days; (4) resistates obtained in step (3) is obtained natural pond slag and natural pond liquid after extracting, solid-liquid separation.
The Anaerobic Digestion technique of the organic waste in the present invention is by improving the processing condition of process organic waste, achieve the dry method digestion techniques that can process solid rate and be greater than the material of 30%DS, without the need to thin up, saving water resource, consume energy low, can produce more biogas energy while simple to operate, biogas can be used as Sweet natural gas and utilizes after purification.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the process flow sheet of process organic waste of the present invention.
Description of reference numerals
1 pre-treatment 2 feeding screw 3 one cancellation ratio reactor 4 two-phase digestion reactor
Compost treatment 8 process water backflow after 5 extraction plant 6 screw compressors 7
9 biogas desulfurization 10 odor purifications
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of Anaerobic Digestion technique of organic waste, this technique comprises the following steps: organic waste pre-treatment becomes length to be after the segment of 55-70 millimeter by (1), enters into a cancellation ratio reactor by feeder; (2) treatment condition of organic waste in a cancellation ratio reactor comprise: add alkaline matter or do not add, and agitator stirring frequency is 90-130 rev/min, generate acid and leftover materials after processing 1-4 days under the effect of extracellular enzyme and acid-producing bacteria; (3) acid obtained in step (2) and leftover materials are passed in two-phase digestion reactor, treatment condition comprise: agitator stirring frequency is 1-8 rev/min, treatment temp is 48-55 DEG C, produces biogas and resistates under the effect of methanobacteria after processing 20-30 days; (4) resistates obtained in step (3) is obtained natural pond slag and natural pond liquid after extracting, solid-liquid separation.
According to the present invention, the organic waste in described step (1) can be agricultural crop straw, melon and fruit waste, fowl and animal excrement or food-processing waste etc., and to this, there is no particular restriction in the present invention.Described organic waste can be processed into the segment that length is 55-70 millimeter, the present invention is also unrestricted to the mode that process organic waste is used, as pruned with cutting machine, also can prune by other modes, as long as offal treatment can be become length to be the segment of 55-70 millimeter.In the present invention, preferably, by cutting machine, organic waste is trimmed to the segment that length is 60-70 millimeter.
According to the present invention, the feeder in described step (1) can be feeder conventional in this area, and as being vibration feeder or feeding screw, in the present invention, preferred feeder is feeding screw.
According to the present invention, containing agitator in a cancellation ratio reactor in described step (1), because treatment process of the present invention is dry method digestion, enter the solid rate of material of dry method digestive organ generally more than 30%, thin up can not be carried out in treating processes, therefore the agitator installed in a cancellation ratio reactor is the stirrer with higher-strength whipping performance, as blade or propeller agitator.The agitator used in the present invention is arm stirrer, fully can stir the material of viscosity higher, and the anaerobic digestion being conducive to organic materials is carried out smoothly.
According to the present invention, in described step (2), the alr mode of agitator can be continuous mixing, also can be batch type, in order to fully mix and promote organic degraded and fermentation, and invention adopts the alr mode of continuous uniform, stirring frequency can be 90-130 rev/min, more preferably 100-120 rev/min.
According to the present invention, the extracellular enzyme in described step (2) in a cancellation ratio device is microorganism conventional in this area, and to this, there is no particular restriction in the present invention; Acid-producing bacteria is also microorganism conventional in this area, and preferred acid-producing bacteria is acetic acid bacteria in the present invention.The usage quantity of the present invention to extracellular enzyme and acid-producing bacteria is also not particularly limited, as long as can effectively carry out degrading and acid process, repeat them here.
According to the present invention, in the treating processes of the organic waste in described step (2) in a cancellation ratio reactor, alkaline matter can be added and also can not add alkaline matter.In the present invention, due to the effect along with extracellular enzyme and acid-producing bacteria, the acid amount produced can be accumulated, and too strong acidity can affect the methanation in two-phase digestion reactor, therefore preferred embodiment for add a certain amount of alkaline matter before entering two-phase digestive organ, to neutralize part acid, follow-up methanation is better carried out; But due in a phase reaction process, reduce if acid and can affect acidization too much, therefore, select in the present invention, after for some time is carried out in a phase reaction, to add a certain amount of alkaline matter, but all acid can not be neutralized.
Particularly, in the present invention, organic waste adds alkaline matter in a cancellation ratio reactor for treatment after 1 day in described step (2), refer in the present invention after described 1 day: to terminate in this time period (comprise 1.5 days with reaction at the end of), all can add alkaline matter to reaction after processing 1 day in a cancellation ratio reactor; Such as, in a cancellation ratio reactor for treatment, the treatment time is 2 days altogether, then can add when 1.5 days in process, also can add in process 2 days (namely at the end of process) time; The alkaline matter weight added is the 0.1-15% of organic waste gross weight; Further preferably, organic waste (comprise cut off value 1.5 days with 2 days) between a cancellation ratio reactor for treatment 1.5-2 days adds alkaline matter, and the alkaline matter weight added is the 1-10% of organic waste gross weight.
According to the present invention, the alkaline matter added in described step (2) can for chemical substance common in chemistry, as added at least one in sodium hydroxide or its aqueous solution, calcium hydroxide or its aqueous solution, sodium carbonate or its aqueous solution and calcium carbonate or its aqueous solution, the concentration of aqueous solution of above-mentioned alkaline matter can be 0.001-5%; At least one in aqueous sodium hydroxide solution and calcium carbonate aqueous solution is preferably in the present invention; The more preferably mass concentration at least one that to be the sodium hydroxide solution of 0.01-1% and mass concentration be in the calcium carbonate soln of 0.001-2%; Further be preferably, the aqueous sodium hydroxide solution of the alkaline matter added to be mass concentration be 0.01-1% and mass concentration are the mixture of the calcium carbonate aqueous solution of 0.001-2%, wherein, the mass ratio of aqueous sodium hydroxide solution and calcium carbonate aqueous solution is 1:(0.2-1).
According to the present invention, in described step (2), the treatment time of organic waste in a cancellation ratio reactor can be 1-4 days, is preferably 1.5-2 days in the present invention.
According to the present invention, in the two-phase digestion reactor in described step (3), digestive organ can adopt horizontal, high 8 meters, is widely no more than 7.2 meters, and long-width ratio easily gets 5:1.Agitator group used is along digestive organ longitudinal arrangement, and the mixing direction of agitator can be in face of material main flow direction.Alr mode in the present invention can be intermittent type can be also continous way, and be preferably batch type, particularly, agitator stirring frequency can be 1-8 rev/min, minute interval 10-20 minute after stirring 1-5; The stirring frequency more preferably 1-5 rev/min of agitator.
According to the present invention, the treatment temp more preferably 50-55 DEG C in the two-phase digestion reactor in described step (3), the treatment time is 22-27 days more preferably.
According to the present invention, the methanobacteria described in described step (3) is well known to those skilled in the art, and the usage quantity of the present invention to methanobacteria is also not particularly limited, as long as effectively can carry out methanation, does not repeat them here.The biogas produced in described step (3) utilizes after can be purified by refining plant.
According to the present invention, in described step (4), resistates can carry out extracting through extraction plant, and be then separated through equipment for separating liquid from solid, obtain natural pond liquid and natural pond slag, equipment for separating liquid from solid described herein can be screw compressor.Wherein, natural pond liquid can as the inoculation of the digestion microorganism of charging in partial reflux to two-phase digestion reactor, and in the present invention, the amount of the natural pond liquid of backflow is preferably 3/1 to four/4ths of total natural pond liquid measure, and unnecessary natural pond liquid can be used as liquid fertilizer outward transport.The amount of concrete backflow biogas slurry is determined according to practical situation demand, and the present invention also has no special requirements.
According to the present invention, this technological process can also comprise: the natural pond slag that step (4) obtains is carried out aerobic compost process and obtains organic fertilizer.In the present invention, the aerobic compost time can be 5-10 days, and material through mechanical overturn, will finally obtain high-quality fertilizer during this period; The foul smell produced in composting process, after collecting, can be introduced in biofilter by pipeline, carry out purifying rear qualified discharge.
Be further elaborated the present invention by the following examples.
In following examples and comparative example, handled waste is the food-processing waste 500Kg that solid rate is 38%DS; Being continuously stirring in one cancellation ratio reactor, is intermittent stirring in two-phase digestion reactor; All enter into desulfurizer by the biogas produced after the process of two-phase digestion reactor and carry out process recovery, the resistates produced carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, the natural pond slag obtained obtains organic fertilizer in 7 days, the foul smell produced in composting process qualified discharge after collection and purification by carrying out aerobic compost process." treating processes power consumption " in embodiment and described in comparative example refers to: terminate as a whole treating processes to solid-liquid separation step from cutting machine treatment step, the energy that this process average per minute consumes.
Embodiment 1
Organic waste being shredded into length by cutting machine is deliver in a cancellation ratio device through feeding screw after the segment of 70 millimeters, stirring frequency is 110 revs/min, under the effect of extracellular enzyme and acid-producing bacteria, process is after 1.8 days, add aqueous sodium hydroxide solution and calcium carbonate aqueous solution weight ratio is continue after the mixture of 1:0.5 to process 0.2 day in a cancellation ratio device, wherein, the weight adding mixture is 5% of organic waste gross weight, the mass concentration of aqueous sodium hydroxide solution is 0.5%, and the mass concentration of calcium carbonate aqueous solution is 0.1%; Then enter into two-phase digestion reactor and carry out two-phase digestion reaction, treatment condition are: treatment temp is 55 DEG C, and the treatment time is 25 days; Agitator stirring frequency is 3 revs/min, stirs 2 minutes intermittently 15 minutes; Resistates after two-phase digestion reaction carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, and the natural pond liquid half obtained refluxes, and second half utilizes as liquid fertilizer.According to this embodiment, can collect biogas is 0.64 cubic metre of/kilogram of waste, treating processes consume energy 0.28 kilowatt-hour/minute.
Embodiment 2
Organic waste being shredded into length by cutting machine is deliver in a cancellation ratio device through feeding screw after the segment of 60 millimeters, stirring frequency is 100 revs/min, under the effect of extracellular enzyme and acid-producing bacteria, process is after 1.5 days, add aqueous sodium hydroxide solution and calcium carbonate aqueous solution weight ratio is 1:0.2, wherein, the weight of the mixture added is 1% of organic waste gross weight, and the mass concentration of aqueous sodium hydroxide solution is 0.01%, and the mass concentration of calcium carbonate aqueous solution is 1%; Then enter into two-phase digestion reactor and carry out two-phase digestion reaction, treatment condition are: treatment temp is 53 DEG C, and the treatment time is 22 days; Agitator stirring frequency is 1 rev/min, often stirs 1 minute intermittently 10 minutes; Resistates after two-phase digestion reaction carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, and obtain natural pond liquid 1/4 refluxes, and 3/4 utilizes as liquid fertilizer.According to this embodiment, can collect biogas is 0.58 cubic metre of/kilogram of waste, treating processes consume energy 0.31 kilowatt-hour/minute.
Embodiment 3
Organic waste being shredded into length by cutting machine is deliver in a cancellation ratio device through feeding screw after the segment of 55 millimeters, stirring frequency is 120 revs/min, under the effect of extracellular enzyme and acid-producing bacteria, process is after 2 days, add aqueous sodium hydroxide solution and calcium carbonate aqueous solution weight ratio is continue after the mixture of 1:1 to process 2 days in a cancellation ratio device, wherein, the weight of the mixture added is 10% of organic waste gross weight, the mass concentration of aqueous sodium hydroxide solution is 1%, and the mass concentration of calcium carbonate aqueous solution is 2%; Then enter into two-phase digestion reactor and carry out two-phase digestion reaction, treatment condition are: treatment temp is 50 DEG C, and the treatment time is 27 days.Agitator stirring frequency is 5 revs/min, often stirs 3 minutes intermittently 15 minutes; Resistates after two-phase digestion reaction carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, and the natural pond liquid 3/4 obtained refluxes, and 1/4 utilizes as liquid fertilizer.According to this embodiment, can collect biogas is 0.61 cubic metre of/kilogram of waste, treating processes consume energy 0.33 kilowatt-hour/minute.
Embodiment 4
Organic waste being shredded into length by cutting machine is deliver in a cancellation ratio device through feeding screw after the segment of 70 millimeters, stirring frequency is 90 revs/min, under the effect of extracellular enzyme and acid-producing bacteria, process is after 2 days, add mass concentration be 0.8% calcium hydroxide aqueous solution continue in a cancellation ratio device process 1 day, wherein, the weight adding calcium hydroxide aqueous solution is 0.1% of organic waste gross weight; Then enter into two-phase digestion reactor and carry out two-phase digestion reaction, treatment condition are: treatment temp is 48 DEG C, and the treatment time is 20 days.Agitator stirring frequency is 2 revs/min, often stirs 5 minutes intermittently 20 minutes; Resistates after two-phase digestion reaction carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, and the natural pond liquid half obtained refluxes, and second half utilizes as liquid fertilizer.According to this embodiment, can collect biogas is 0.55 cubic metre of/kilogram of waste, treating processes consume energy 0.33 kilowatt-hour/minute.
Embodiment 5
Organic waste being shredded into length by cutting machine is deliver in a cancellation ratio device through feeding screw after the segment of 70 millimeters, stirring frequency is 130 revs/min, under the effect of extracellular enzyme and acid-producing bacteria, process added the aqueous sodium carbonate that mass concentration is 2% after 1 day, wherein, the weight of the aqueous sodium carbonate added is 15% of organic waste gross weight; Enter into two-phase digestion reactor and carry out two-phase digestion reaction, treatment condition are: treatment temp is 50 DEG C, and the treatment time is 30 days.Agitator stirring frequency is 8 revs/min, often stirs 2 minutes intermittently 10 minutes; Resistates after two-phase digestion reaction carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, and the natural pond liquid obtained utilizes as liquid fertilizer.According to this embodiment, can collect biogas is 0.57 cubic metre of/kilogram of waste, treating processes consume energy 0.38 kilowatt-hour/minute.
Embodiment 6
Organic waste being shredded into length by cutting machine is deliver in a cancellation ratio device through feeding screw after the segment of 70 millimeters, stirring frequency is 110 revs/min, process 2 days under the effect of extracellular enzyme and acid-producing bacteria, then enter into two-phase digestion reactor and carry out two-phase digestion reaction, treatment condition are: treatment temp is 55 DEG C, and the treatment time is 25 days; Agitator stirring frequency is 3 revs/min, often stirs 2 minutes intermittently 15 minutes; Resistates after two-phase digestion reaction carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, and the natural pond liquid half obtained refluxes, and second half utilizes as liquid fertilizer.According to this embodiment, can collect biogas is 0.53 cubic metre of/kilogram of waste, treating processes consume energy 0.38 kilowatt-hour/minute.
Embodiment 7
Organic waste being shredded into length by cutting machine is deliver in a cancellation ratio device through feeding screw after the segment of 70 millimeters, stirring frequency is 90 revs/min, under the effect of extracellular enzyme and acid-producing bacteria, process is after 2 days, add mass concentration be 0.8% aqueous sodium hydroxide solution continue in a cancellation ratio device process 1 day, wherein, the weight adding aqueous sodium hydroxide solution is 0.1% of organic waste gross weight; Then enter into two-phase digestion reactor and carry out two-phase digestion reaction, treatment condition are: treatment temp is 48 DEG C, and the treatment time is 20 days.Agitator stirring frequency is 2 revs/min, often stirs 5 minutes intermittently 20 minutes; Resistates after two-phase digestion reaction carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, and the natural pond liquid half obtained refluxes, and second half utilizes as liquid fertilizer.According to this embodiment, can collect biogas is 0.56 cubic metre of/kilogram of waste, treating processes consume energy 0.30 kilowatt-hour/minute.
Embodiment 8
Organic waste being shredded into length by cutting machine is deliver in a cancellation ratio device through feeding screw after the segment of 70 millimeters, stirring frequency is 90 revs/min, under the effect of extracellular enzyme and acid-producing bacteria, process is after 2 days, add mass concentration be 0.8% calcium carbonate aqueous solution continue in a cancellation ratio device process 1 day, wherein, the weight adding calcium carbonate aqueous solution is 0.1% of organic waste gross weight; Then enter into two-phase digestion reactor and carry out two-phase digestion reaction, treatment condition are: treatment temp is 48 DEG C, and the treatment time is 20 days.Agitator stirring frequency is 2 revs/min, often stirs 5 minutes intermittently 20 minutes; Resistates after two-phase digestion reaction carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, and the natural pond liquid half obtained refluxes, and second half utilizes as liquid fertilizer.According to this embodiment, can collect biogas is 0.55 cubic metre of/kilogram of waste, treating processes consume energy 0.32 kilowatt-hour/minute.
Embodiment 9
Organic waste being shredded into length by cutting machine is deliver in a cancellation ratio device through feeding screw after the segment of 70 millimeters, stirring frequency is 110 revs/min, under the effect of extracellular enzyme and acid-producing bacteria, process is after 1 day, add aqueous sodium hydroxide solution and calcium carbonate aqueous solution weight ratio is continue after the mixture of 1:0.5 to process 1 day in a cancellation ratio device, wherein, the weight adding mixture is 5% of organic waste gross weight, the mass concentration of aqueous sodium hydroxide solution is 0.5%, and the mass concentration of calcium carbonate aqueous solution is 0.1%; Then enter into two-phase digestion reactor and carry out two-phase digestion reaction, treatment condition are: treatment temp is 55 DEG C, and the treatment time is 25 days; Agitator stirring frequency is 3 revs/min, often stirs 2 minutes intermittently 15 minutes; Resistates after two-phase digestion reaction carries out entering into screw compressor after extracting through extraction plant and carries out solid-liquid separation, and the natural pond liquid half obtained refluxes, and second half utilizes as liquid fertilizer.According to this embodiment, can collect biogas is 0.57 cubic metre of/kilogram of waste, treating processes consume energy 0.33 kilowatt-hour/minute.
Comparative example 1
According to embodiment similar to Example 1, its difference is, is not to adopt dry method digestion techniques in this comparative example, but in a cancellation ratio process, adds 500Kg water dilute.According to this embodiment, can collect biogas is 0.46 cubic metre of/kilogram of waste, treating processes consume energy 0.83 kilowatt-hour/minute.
As can be seen from the result of above-described embodiment and comparative example, the treatment process of the organic waste that the present invention adopts is by improving the processing condition of process organic waste, achieve the dry method digestion techniques that can process solid rate and be greater than the material of 30%DS, treating processes is without the need to thin up, saving water resource, meanwhile, compared with wet method, dry method has the while of consuming energy low can produce more biogas energy, and biogas can be used as Sweet natural gas and utilizes after purification.
In addition it can also be seen that, be conducive to when adding alkaline matter in a cancellation ratio reactor generating more biogas, when particularly add the aqueous sodium hydroxide solution that mass concentration is 0.01-1% and/or mass concentration when a cancellation ratio reactor for treatment 1.5-2 days be the calcium carbonate aqueous solution of 0.001-2%, consume energy low while can collect more biogas.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. an Anaerobic Digestion technique for organic waste, this technique comprises the following steps:
(1) organic waste pre-treatment become length to be after the segment of 55-70 millimeter, enter into a cancellation ratio reactor by feeder;
(2) treatment condition of organic waste in a cancellation ratio reactor comprise: add alkaline matter or do not add, and agitator stirring frequency is 90-130 rev/min, generate acid and leftover materials after processing 1-4 days under the effect of extracellular enzyme and acid-producing bacteria;
(3) acid obtained in step (2) and leftover materials are passed in two-phase digestion reactor, treatment condition comprise: agitator stirring frequency is 1-8 rev/min, treatment temp is 48-55 DEG C, produces biogas and resistates under the effect of methanobacteria after processing 20-30 days;
(4) resistates obtained in step (3) is obtained natural pond slag and natural pond liquid after extracting, solid-liquid separation.
2. treatment process according to claim 1, wherein, in described step (2), organic waste comprises in the treatment condition of a cancellation ratio reaction treatment device and adds alkaline matter.
3. treatment process according to claim 1, wherein, organic waste adds alkaline matter in a cancellation ratio reactor for treatment after 1 day in described step (2), and the alkaline matter weight added is the 0.1-15% of organic waste gross weight.
4. treatment process according to claim 3, wherein, in described step (2), organic waste adds alkaline matter when a cancellation ratio reactor for treatment 1.5-2 days, and the alkaline matter weight added is the 1-10% of organic waste gross weight.
5. treatment process according to claim 1, wherein, the alkaline matter in described step (2) is be selected from least one in sodium hydroxide or its aqueous solution, calcium hydroxide or its aqueous solution, sodium carbonate or its aqueous solution and calcium carbonate or its aqueous solution.
6. treatment process according to claim 1, wherein, the alkaline matter in described step (2) is that to be selected from aqueous sodium hydroxide solution that mass concentration is 0.01-1% and mass concentration be at least one in the calcium carbonate aqueous solution of 0.001-2%.
7. treatment process according to claim 6, wherein, the alkaline matter added in described step (2) is aqueous sodium hydroxide solution and calcium carbonate aqueous solution weight ratio is 1:(0.2-1) mixture.
8. treatment process according to claim 1, wherein, in described step (2), the reaction conditions of organic waste in a cancellation ratio reactor comprises: stirring frequency is 100-120 rev/min, and the treatment time is 1.5-2 days.
9. treatment process according to claim 1, wherein, in described step (3), the treatment condition of two-phase digestion reactor comprise: stirring frequency is 1-5 rev/min, and treatment temp is 50-55 DEG C, and the treatment time is 22-27 days.
10. treatment process according to claim 1, wherein, in described step (4), the 1/4-3/4 of natural pond liquid is back in two-phase digestion reactor.
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| 张庆芳等: "餐厨垃圾废弃物处理技术概述", 《中国沼气》 * |
| 陈广银等: "pH值调控对秸秆两阶段厌氧发酵产沼气的影响", 《生态环境学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106145589A (en) * | 2016-07-27 | 2016-11-23 | 武汉都市环保工程技术股份有限公司 | A kind of city sludge processing method |
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| CN104928325B (en) | 2019-03-22 |
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