A kind for the treatment of process of comprehensive treating process castoff high in containing water
Technical field
The present invention relates to the method for one kind of multiple organic waste comprehensive treating processs.
Background technology
Along with the raising of Agricultural Industrialization Development and life in the countryside life, the organic waste pollution problem that particularly castoff high in containing water causes in villages and small towns has started to manifest.China's villages and small towns castoff high in containing water can be divided into following several types by its source difference: (1) fowl and animal excrement: comprise the movement of livestock and the poultry of livestock and poultry farm, 3,000,000,000 tons of annual production; (2) processing of farm products waste: comprise waste water waste material and the vegetables and fruits processing wastes such as slaughterhouse, brew-house, Milk Products Plant, 200,000,000 tons of annual production; (3) changing food waste: mainly from restaurant, school lunch service, enterprises and institutions dining room etc., along with the development of rural tourism industry, the total amount of rural area changing food waste is constantly soaring in recent years.These villages and small towns waste great majority are not used as the utilization of resources, but arbitrarily abandon or be discharged in environment, and ecotope is caused to very large pollution.The a large amount of ight soil of livestock industry does not obtain suitable processing, causes the loss of organonitrogen, phosphorus and serious environmental pollution.Processing of farm products waste is stacked the foul smell producing and is had a strong impact on Air quality, forms irreversible to the secondary pollution of atmosphere and water and soil on a large scale around.In changing food waste, directly feed pigs and cause " rubbish pig " problem, the mishandling easy formation of grease " sewer oil ".
This project is carried out industrialization disposal by multiple villages and small towns castoff high in containing water, the employing basis of pre-treatment as efficient anaerobic that become more meticulous, break through original biogas engineering and adopted single pattern of planting raw material, compare with traditional biogas engineering, have organic loading high, the residence time is short, and treatment capacity is large, factor of created gase is high, the few advantage of natural pond slag of generation.Industrial treatment organic waste anaerobic methane production is also recycled also in the starting stage, therefore this project is conducive to the structural readjustment of rural industry and development pattern transformation, by extensive style, to the transformation that becomes more meticulous, " 12 " New Chinese Rural construction that emphasis is mentioned in the works merges.To pushing away, alleviate energy shortage, promote sustainable development significant.
Summary of the invention
Technical problem to be solved by this invention is to provide the multiple organic waste of a kind of energy processing, anaerobic fermentation gas production rate is high, mud load rate is high and the treatment process of the comprehensive treating process castoff high in containing water that natural pond slag generation is little.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind for the treatment of process of comprehensive treating process castoff high in containing water, is characterized in that comprising the steps:
(1) after sorting, pulverizing, homogeneous, slurrying, separation, acidifying, to make successively pH be 3.5-4.0, COD 80~120kg/m to kitchen castoff
3, TS 6-8%, oil length≤0.2% anaerobism raw material;
(2) processing of farm products waste is made pH 3.5-4.0, COD80~120kg/m successively after sorting, pulverizing, slurrying, acidifying
3, TS 6-8% anaerobism raw material;
(3) fowl and animal excrement squeezes after desilting, and the water after squeezing, directly as anaerobism raw material, is made anaerobism raw material after solid phase slurrying after pulverizing, acidifying;
(4) anaerobically fermenting, pumps into anaerobic jar by the anaerobism raw material after aforementioned processing, makes charging COD 80~120kg/m
3, TS6-8%; 52~58 ℃ of leavening temperatures; Gas stirring; Redox potential-180~-350mV;
(5) biogas obtaining, for enterprise or resident, after the slag press filtration of natural pond, is divided into solid phase and removes fertilizer processed, and water qualified discharge after water treatment.
As improvement, described kitchen castoff sorting is to adopt twice sorting, and foreign material are recycled or sanitary landfill.
As improvement, described kitchen castoff separation is to adopt three phase separation, and isolated liquid phase, through oily water separation, obtains thick grease, carries out grease processing.
As improvement, the water processing of anhydrating again after converging after Ye Yu natural pond, the natural pond slag press filtration after described anaerobically fermenting.
As improvement, spray absorption after the gas sampling producing when described kitchen castoff is pulverized, rear discharge up to standard.
Finally, described step (1), (2), (3) in no particular order, any order combination.
Compared with prior art, the invention has the advantages that: mainly through classification pre-treating technology, improve organic content in material, through pulverizing slurrying, acidication technique, progressively change non-dissolved organic matter into dissolved organic matter, improve anaerobic fermentation gas production rate and mud load rate, reduced natural pond slag generation.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
(1) pre-treatment of kitchen castoff, twice separation step that changing food waste forms through one-level mechanical sorting, Mechanical Crushing, secondary mechanical sorting, guarantee that the foreign material such as plastic substance, vial, bamboo be wherein wooden, ceramic separate, foreign material clearance reaches more than 90%, macrobead organic materials is broken into the material relatively uniformly that size is no more than 25mm simultaneously, and callable foreign material are recycled, expendable foreign material transport sanitary filling field landfill to, greatly reduce like this labour intensity of workman's sorting, improved the quality of changing food waste; Then adopt pulverising step, this technology can pulverize to reach to sorting discharging the dimensional requirement of restriction.The size of material is down to below 3mm, is convenient to pipeline and carries, and, in crushing process, gas sampling is got up, by spray adsorption treatment, rear emission gases up to standard meanwhile, adopt clarifixator to carry out homogenization treatment to the material after pulverizing, carry out slurrying, like this, solid phase organic waste is processed through slurrying again, forms particle diameter 80-100 object particle, reduces three phase separation solid content, then pass through three phase separation, oily water separation step, adopt horizontal centrifuge to carry out light phase, heavy phase, Gu slag three phase separation, reduce the solid content in liquid phase, improve light phase grease ratio, reduce back segment oily water separation difficulty, through disc centrifuge, carry out oily water separation again, obtain the grease of water ratio≤3%, the liquid phase of oil length≤0.2%, because grease molecular weight is large and be difficult to acidifying, become small molecules volatile acid, anaerobically fermenting speed is low, therefore this technology can make anaerobically fermenting efficiency be improved, the thick grease of separating send grease processing, and water and solid phase are sent acidification step, project adopts segmentation anaerobic treatment method, acidication and methanation are separately carried out, material is through the equalizing tank acidifying that is hydrolyzed, progressively change non-dissolved organic matter into dissolved organic matter, mainly small molecules acid, buffering and dilution load impact and objectionable impurities, and produce the base-material that biogas provides high-quality for follow-up methanation, the condition of control condition acidication reaction, produce lipid acid, do not produce biogas as far as possible, finally making pH is 3.5-4.0, COD 80~120kg/m
3, TS 6-8%, oil length≤0.2% anaerobism raw material,
(2) pre-treatment of processing of farm products waste: processing of farm products waste, after the artificial removal of impurities of separation step, is pulverized, and particle diameter is less than 3mm, then through slurrying and acidifying, forms low pH 3.5-4.0, COD 80~120kg/m
3, the anaerobism raw material of TS 6-8%;
(3) pre-treatment of fowl and animal excrement: fowl and animal excrement squeezes after desilting, the water after squeezing, directly as anaerobism raw material, is made anaerobism raw material after solid phase slurrying after pulverizing, acidifying;
(4) anaerobically fermenting is processed, adopt modified version upflow anaerobic sludge blanket process (UASB) as anaerobic fermentation tank, regulate the ratio of changing food waste and processing of farm products waste and fowl and animal excrement, after making aforesaid three kinds of anaerobically fermenting mixing of materials, carbon-nitrogen ratio reaches 16~25: 1, COD, 80~120kg/m
3, TS6-8%, leavening temperature is controlled at 52-58 ℃, gas stirring, redox potential-180~-350mV, now microbial reproduction and production biogas efficiency are higher.High temperature anaerobic can be killed pathogenic microorganism, and gas producing efficiency is high, and the residence time is short.Acidication product is flowed into and mixes and contact with mud sludge blanket from anaerobic jar bottom by water distribution system, microorganism in mud is decomposed the organism in charging, it is converted into the final products such as methane and carbon dioxide, biogas is constantly emitted with micro-bubble form, in uphill process, constantly merges, form gradually larger bubble, feed liquid in tank is carried out to gas stirring, and natural pond liquid overflows from overflow port top, then discharges anaerobic jar.This process keeps strict anaerobic condition and pH value, is beneficial to the growth of methanobacteria; Degraded, stable organic matter, produce containing the more digestion gas of methane.Modified version UASB is equipped with malleation and negative-pressure protection device in top, has anti-blocking explosion-proof effect.Device gas deliverability makes castoff high in containing water after comprehensive treating process, high temperature anaerobic factor of created gase 4.0m
3biogas/m
3tank body d, methane content of bilogas 55-65%.
(5) biogas obtaining, for enterprise or resident, after the slag press filtration of natural pond, is divided into solid phase and removes fertilizer processed, and natural pond liquid after water and anaerobically fermenting converges, qualified discharge after water treatment.
Compared with prior art, the present invention mainly improves organic content in material through classification pre-treating technology, through pulverizing slurrying, acidication technique, progressively change non-dissolved organic matter into dissolved organic matter, improve anaerobic fermentation gas production rate and mud load rate, reduced natural pond slag generation.