CN102441555A - Comprehensive utilization and treatment method for urban domestic garbage - Google Patents
Comprehensive utilization and treatment method for urban domestic garbage Download PDFInfo
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- CN102441555A CN102441555A CN2011102481731A CN201110248173A CN102441555A CN 102441555 A CN102441555 A CN 102441555A CN 2011102481731 A CN2011102481731 A CN 2011102481731A CN 201110248173 A CN201110248173 A CN 201110248173A CN 102441555 A CN102441555 A CN 102441555A
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- 238000000034 method Methods 0.000 title abstract description 25
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- 238000000855 fermentation Methods 0.000 claims abstract description 22
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- 239000003337 fertilizer Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000010521 absorption reaction Methods 0.000 claims abstract description 13
- 239000010881 fly ash Substances 0.000 claims abstract description 13
- 239000003895 organic fertilizer Substances 0.000 claims abstract description 9
- 239000002023 wood Substances 0.000 claims abstract description 9
- 235000013311 vegetables Nutrition 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
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- 238000005516 engineering process Methods 0.000 claims description 28
- 239000010791 domestic waste Substances 0.000 claims description 19
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 18
- 239000000047 product Substances 0.000 claims description 18
- 230000004151 fermentation Effects 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 12
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- 238000003672 processing method Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 239000002250 absorbent Substances 0.000 claims description 9
- 230000002745 absorbent Effects 0.000 claims description 9
- 239000001569 carbon dioxide Substances 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 9
- 238000009264 composting Methods 0.000 claims description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
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- 239000012492 regenerant Substances 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- FYHXNYLLNIKZMR-UHFFFAOYSA-N calcium;carbonic acid Chemical compound [Ca].OC(O)=O FYHXNYLLNIKZMR-UHFFFAOYSA-N 0.000 claims description 3
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- 235000013399 edible fruits Nutrition 0.000 description 1
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/20—Waste processing or separation
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/78—Recycling of wood or furniture waste
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- Processing Of Solid Wastes (AREA)
- Fertilizers (AREA)
Abstract
A comprehensive utilization and treatment method of municipal solid waste comprises the following steps: sorting the mixed garbage into metal directly recovered materials, landfill materials, anaerobic digestion biogas production materials and plastic-wood product raw materials; crushing the raw materials of the plastic-wood product and then carrying out vacuum compression molding; preparing biogas by using a fully-mixed anaerobic fermentation tank as a main reactor; the prepared marsh gas is used as automobile fuel gas after being treated by absorption solution, secondary dehydration and compression treatment, and the absorption solution releases absorbed impurities after being self-cleaned by solution and gas regeneration treatmentAnd gas, the released gas is purified and compressed to be used as light fertilizer required by planting the greenhouse vegetables; pretreating aerobic biochemical treated biogas slurry by using activated fly ash to adsorb NH3-N; adsorbing saturated NH3Adding biogas residues and a preset amount of inorganic N, P, K element fertilizer into the fly ash of the-N to produce the organic fertilizer. The mixed garbage is separated and then respectively prepared into products such as volume substitution wood products, vehicle CNG gas, greenhouse vegetable light fertilizer, agricultural organic fertilizer and the like, and the method is economical and environment-friendly.
Description
Technical field
The present invention relates to a kind of environmental sanitation technical field, be meant domestic waste comprehensive utilization and processing method especially.
Background technology
Along with the fast development of urbanization process, the processing of domestic waste has become the difficult problem that each city of restriction promotes image and sustainable development.At present, the waste disposal method of domestic routine mainly contains: landfill method, composting process and burning method.The defective of the whole bag of tricks is all more obvious, and for example: there is contaminated environment in landfill method, takies the defective of a large amount of land resources, and applied value reduces gradually; Factors such as the composting process of composting process is difficult to control, and is bigger to the secondary pollution risk in bad border, incomplete to organic utilization, and the fertilizer composition is complicated, and minimizing is less will progressively be eliminated; Combustible content in the slag of burning method >=5%, the hot burn decrement rate of slag >=3%, the operation processing cost is high, and discharge tail gas is difficult for up to standard, and the violent in toxicity bioxin discharge capacity that especially contains in the tail gas is not up to standard for a long time, has seriously hindered technical development.
The reason that causes above-mentioned situation is determined by the characteristics of Chinese city house refuse composition.Receive the influence of consumption habit and environmental consciousness; The rubbish of external most of developed countries is thrown in and collection method is the classification reception; Rubbish before the entering incineration plant is by good classification, and the kitchen in the rubbish is surplus and hogwash class amount of substance is less, and moisture and putrescible matter are lower; Packed standard is to burn to utilize and has created good condition.And in China, the collection method of rubbish is traditional mixing and receives, and the content surplus and hogwash class material of the kitchen in the rubbish is higher; Moisture and putrescible matter are higher; Packed also lack of standardization, raw refuse is almost " bag in the bag ", and form is thrown in, and the material composition complicacy can't be classified in the bag; This type of common name rubbish is " high humidity composting " in the industry, and this type composting possesses following characteristic:
1, calorific value is low: the design refuse thermal value of common incinerator is more than 1200kcal/kg, and now the domestic waste of China is not classify to mix and receives, and the kitchen is surplus, the content of dregs etc. is up to more than 60%, so its calorific value is difficult to reach design load.
2, moisture is high: because the kitchen in the rubbish is surplus, the moisture of the bright body of plant etc. is all more than 65%, so under the normal condition, the moisture in the domestic waste of China is all more than 50%, at plum rain season or its limit moisture of rainy day up to more than 70%.
3, packed reception lack of standardization, rubbish form, calorific value are inhomogeneous: the house refuse of domestic city almost is the packed reception of not classifying, and the component of rubbish is very complicated, and all gap is bigger for its physical aspect, calorific value, distribution space, chemical form etc.
Adopt garbage organism to produce the usual way that biogas is garbage disposal and recycling, the technology of existing sharp rubbish producing methane mainly contains: high temperature modification rubbish organic system natural pond technology and the organic system of low form rubbish natural pond technology.
Wherein, The organic system of high temperature modification rubbish natural pond technology is the organic system of the domestic rubbish that generally adopts natural pond technology, and its typical case is represented as: Beijing Fresnel Science and Technology Ltd. rubbish system natural pond electrification technique as well as, the general new science and technology in Shenzhen Co., Ltd " the full resource environmental project of zero-emission " technology.The characteristics of this technology are: be tie with biogas; Make full use of the hot fermentation of solar energy, generating waste-heat homenergic realization biogas; Make rubbish and excrement dirt become biogas energy, compound organic fertilizer and non-burning brick product, its tie act as the compound organic fertilizer that agricultural production safety grain, pollution-free food (vegetables, fruit) etc. provide high-quality.The resource target of the organic system of high temperature modification rubbish natural pond technology is that power generation and heat supply behind employing anaerobic fermentation production biogas, the marsh gas purifying, biogas residue liquid are made fertilizer; Unnecessary natural pond slag is done directly to do the fertile sale in natural pond after burning (with can) or the dehydration, unnecessary natural pond liquid be used to dilute ight soil or with qualified discharge after the BBR system handles ".The practical implementation technological process of the organic system of high temperature modification rubbish natural pond technology is as shown in Figure 1.
Yet there is following problem in the organic system of high temperature modification rubbish natural pond technology:
1 ,-refuse classification is incomplete, influences sweat.Because the component of refuse of China mix to receive, its sorting is aided with the formal operations of screening with manual work, and its sorting index, randomness are all higher.A large amount of waste plastics sheets, hard fibre plain (wooden type) be place to go completely not all, floats on fermentation slip top during the fermentation, forms serious " crust ", and influence biogas and separate out, acceleration natural pond liquid acidifying, the COD conversion ratio is lower.
2, the unreasonable structure of marsh gas reactor (methane-generating pit).Owing to adopt static fermentation technology, except that can't solving " crust " phenomenon, also exist fermentation period long, fermentation lack of homogeneity problem can't realize the low temperature rapid fermentation.Can only rely on solar energy and generating waste-heat to ferment and heat processing, promote reaction, increase investment and operating cost.
3, the recycling level of biogas product is low.Biogas product utilization resource level is low, and the resource recycling means and the output products of its vapour, three products of solid, liquid are single, has reduced the operation benefits of project.
Because the existing many weakness of above-mentioned high temperature modification rubbish organic system natural pond technology, biogas research institute of the Ministry of Agriculture according to self abundant biogas fermentation experience, adopts the biological efficient anaerobic microorganism fungus kind of being studied of being cultivated in Chinese Academy of Sciences Chengdu.Successfully developed the organic system of low form rubbish natural pond technology, its technological process is as shown in Figure 2.And the main technological features of the organic system of low form rubbish natural pond technology is: adopt CSTER full-mixing type fermentation system, realized that the low temperature of marsh gas fermenting system is degraded fast, effectively improved the yield of the COD of unit biogas, reduce floor space.This technology is extensively adopted both at home and abroad.
Yet also there is following problem in the organic system of low form rubbish natural pond technology:
1, there is not complete refuse classification technology.On this technology, adopt manual sort's form, domestic present stage can't realize in China, must have mechanization, automation installation to come preliminary treatment, can ensure homogeneity, the stability of the material that gets into treatment system.
2, there is not complete waste classification substances recycling measure.Plastics, dry goods and hardwood class material in China's rubbish account for more than 20% of rubbish total amount, and this type of material does not have good recovery measure, will cause the great wasting of resources and cause certain secondary pollution.
3, the degree of depth recycling of biogas fermentation product.Because belong to bulky refuse recycling treatment Facilities Construction economically developed surrounding city area, the level of urbanization is high, agricultural and people in the countryside are less relatively.So essential condition that the efficient increment utilization of biogas fermentation product is the long-time running of guarantee project.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of domestic waste comprehensive utilization and processing method are provided, and with effective processing domestic waste, and carries out efficient resource processing and utilization.
For solving the problems of the technologies described above, the present invention provides following technical scheme: a kind of domestic waste comprehensive utilization and processing method, it comprises the steps:
The refuse classification step; Domestic waste; After stopping to carry out Fully-mechanized effective fragmentation on the basis of artificial separation, with screening installation the composting branch is elected as again: the direct regenerant class of metal, landfill material class, anaerobic digester system natural pond class, mould woodwork raw material class;
Appearance is for the wood products forming step, moulded woodwork raw material pulverizing powdering raw material with what sort out, powder raw material sent into again and moulded wooden thermal vacuum make-up machine and carry out vacuum compression molding;
System natural pond step adopts full-mixing type fermentation system technology, prepares biogas with the full-mixing type anaerobic fermentation vat as main reactor;
Marsh gas purifying and utilize step; Under the catalyst condition; Adopt absorbent solution, utilize the acid-base neutralization reaction, acidic materials in the absorption biogas and Ammonia gas soluble in water; The biogas that purified is used as motor vehicle fuel CNG gas after second dehydration and processed compressed; And the absorbent solution that has absorbed impurity and Ammonia gas is heated to 60 ~ 70 ℃ with steam, the carbon dioxide that is absorbed is separated out also after further purification is compressed, carbon dioxide is used as the required light fertilizer of planting vegetable in greenhouse, and surplus solution supplies to recycle after adjusting pH value to preset range again behind the carbonic acid calcium precipitate through elimination;
Natural pond liquid treatment step, behind the system natural pond remaining natural pond liquid after aerobic biochemical is handled, with through the flyash of activation processing as adsorbent, natural pond liquid is carried out preliminary treatment absorption NH
3-N, saturated absorption NH
3Flyash behind the-N is as the nitrogenous source in the fertilizer raw material;
The natural pond slag utilizes step, with saturated absorption NH
3The flyash of-N adds all natural pond slags, and allocates inorganic N, P, the K element fertilizer of predetermined amount into, produces organic fertilizer product.
Further, above marsh gas purifying and utilizing in the step, the catalyst that is adopted is alundum (Al or magnesia, absorbent solution is with the aqua calcis of pH value allotment to 8 ~ 9.
Further, the content of N, P, K element accounts for the 20%-30% of gross weight.
Further, at marsh gas purifying and utilize in the production process that makes processing that carbon dioxide separates out and natural pond slag utilize fertilizer in the step in the step and need to use thermal source, and the thermal source that adopts is made the burning of the biogas that the natural pond step produced by oneself.
Further, the water source that adopted of refuse classification step is the natural pond liquid or the sanitary sewage of dissolving and handling.
Through adopting technique scheme; The present invention has following beneficial effect at least: the present invention adopts the several different methods integrated application through after domestic waste is carried out effective fragmentation, and composting is categorized as available industry or agricultural raw material; Again these feedstock conversion are corresponding products such as appearance substitute materials for wood, vapour vehicle CNG gas, booth vegetable light fertilizer, agricultural organic fertilizer product; The data using rate is high, and environmental protection and economy, has remarkable environmental benefit and economic benefit.
Description of drawings
Fig. 1 is the process chart of the organic system of existing high temperature modification rubbish natural pond technology.
Fig. 2 is the process chart of the organic system of existing low form rubbish natural pond technology.
Fig. 3 is the process chart of domestic waste comprehensive utilization of the present invention and processing method.
The specific embodiment
Please refer to the flow chart of one embodiment of the present of invention shown in Figure 3, the present invention provides a kind of domestic waste comprehensive utilization and processing method, and it comprises the steps:
The refuse classification step; Domestic waste; After stopping to carry out Fully-mechanized effective fragmentation on the basis of artificial separation; With screening installation the composting branch is elected as: the direct regenerant class of metal, landfill material class, anaerobic digester system natural pond class, mould woodwork raw material class, the direct regenerant class of metal wherein can directly be recycled, and the landfill material class is then delivered to landfill yard and carried out landfill disposal again; Anaerobic digester system natural pond class then is used for follow-up system natural pond step, moulds woodwork raw material class and is used for follow-up appearance for the wood products forming step;
Appearance is for the wood products forming step; Moulded woodwork raw material pulverizing powdering raw material with what sort out; Again powder raw material is sent into and moulded wooden thermal vacuum make-up machine and carry out vacuum compression molding; The thermoforming unit that to mould wooden thermal vacuum make-up machine be a kind of Almightiness type that is adopted; With vacuum forming is main; The moulding of double energy pneumatics, compression molding and comprehensive moulding can be processed nearly all thermoforming plastic sheet material;
System natural pond step; Adopt full-mixing type fermentation system technology; Adopt the full-mixing type anaerobic fermentation vat to prepare biogas as main reactor; Because of all being " pulpous state " after the fermentation raw material preliminary treatment; Flowability and uniformity are all good, satisfy the ingredient requirement of full-mixing type anaerobic fermentation technique fully, therefore select the main reactor of full-mixing type anaerobic pond as the biogas reaction; Thereby can improve factor of created gase, minimizing fermentation time, the reduction reaction temperature of biogas, have the unrivaled advance of other technologies;
Marsh gas purifying and utilize step; Under the catalyst condition, adopt absorbent solution, utilize the acid-base neutralization reaction; Acidic materials in the absorption biogas and Ammonia gas soluble in water; As motor vehicle fuel CNG gas, and the absorbent solution that has absorbed impurity and Ammonia gas is heated to 60 ~ 70 ℃ with steam to the biogas that purified after second dehydration and processed compressed, the carbon dioxide that is absorbed is separated out and after the compression of further purifying, carbon dioxide is used as the required light fertilizer of planting vegetable in greenhouse; And surplus solution supplies to recycle after adjusting pH value to preset range again behind the carbonic acid calcium precipitate through elimination; In this step, the catalyst that is adopted is preferably alundum (Al or magnesia, and the then preferred pH value of absorbent solution is allocated the aqua calcis to 8 ~ 9;
Natural pond liquid treatment step, behind the system natural pond remaining natural pond liquid after aerobic biochemical is handled, with through the flyash of activation processing as adsorbent, natural pond liquid is carried out preliminary treatment, through absorption NH
3The saturated flyash of-N is as the nitrogenous source in the fertilizer raw material, because natural pond liquid is after aerobic biochemical is handled, and NH wherein
3The removal of-N and CODCr becomes the decision condition of sewage later use, with through the flyash of activation processing as adsorbent, natural pond liquid is carried out preliminary treatment, have effect preferably, industrial result of trial operation shows, through the flyash of modification CODCr, the NH to natural pond liquid
3-N has the ability of removing preferably, CODCr clearance at least 72%, and NH
3-N clearance surpasses 83%, and index is lower than the highest permission concentration of emission of pollutant of regulation in the integrated wastewater discharge standard (GB8978-1996);
The natural pond slag utilizes step, from absorption of N H
3The flyash of-N gained adds all natural pond slags, and it is fertile to be aided with inorganic N, P, the K element of allocating predetermined amount into; Produce organic fertilizer product; N, P, three kinds of constituent contents of K account for the 20%-30% of gross weight, particularly, are to carry out proportioning according to the standard recipe ratio of Different Crop fertilizer special for organic.
More than in each step, at marsh gas purifying and utilize in the production process that makes processing that carbon dioxide separates out and natural pond slag utilize fertilizer in the step in the step and need to use thermal source, and the thermal source that adopts is made the burning of the biogas that the natural pond step produced by oneself.And the water source that the refuse classification step is adopted is the natural pond liquid or the sanitary sewage of dissolving and handling.
Through adopting method of the present invention, handling 100 tons of rubbish scales with day is example, can draw following enforcement effect roughly:
Garbage disposal ability: 100 tons/day;
The supporting sewage utilization of dissolving: 200 tons/day;
Reclaim and hold: 20 ~ 30 tons/day (changing) based on the zone for wood products;
Reclaim metal species: 3 ~ 5 tons/day (changing) according to the zone;
Produce vehicle CNG gas: 10 ~ 15 tons/day (changing) according to the zone;
It is fertile to produce booth vegetable light: 10 ~ 15 tons/day;
Reclaim and produce agricultural organic fertilizer product: 50 tons/day (need join inorganic elements fertilizer);
Landfill material total amount after integrated treatment:＜15 tons/day.
From the above, the inventive method implementation result is remarkable, has good environmental benefit and economic benefit.
Claims (5)
1. a domestic waste fully utilizes and processing method, it is characterized in that, comprises the steps:
The refuse classification step; Domestic waste; After stopping to carry out Fully-mechanized effective fragmentation on the basis of artificial separation, with screening installation the composting branch is elected as again: the direct regenerant class of metal, landfill material class, anaerobic digester system natural pond class, mould woodwork raw material class;
Appearance is for the wood products forming step, moulded woodwork raw material pulverizing powdering raw material with what sort out, powder raw material sent into again and moulded wooden thermal vacuum make-up machine and carry out vacuum compression molding;
System natural pond step adopts full-mixing type fermentation system technology, prepares biogas with the full-mixing type anaerobic fermentation vat as main reactor;
Marsh gas purifying and utilize step; Under the catalyst condition; Adopt absorbent solution, utilize the acid-base neutralization reaction, acidic materials in the absorption biogas and Ammonia gas soluble in water; The biogas that purified is used as motor vehicle fuel CNG gas after second dehydration and processed compressed; And the absorbent solution that has absorbed impurity and Ammonia gas is heated to 60 ~ 70 ℃ with steam, the carbon dioxide that is absorbed is separated out also after further purification is compressed, carbon dioxide is used as the required light fertilizer of planting vegetable in greenhouse, and surplus solution supplies to recycle after adjusting pH value to preset range again behind the carbonic acid calcium precipitate through elimination;
Natural pond liquid treatment step, behind the system natural pond remaining natural pond liquid after aerobic biochemical is handled, with through the flyash of activation processing as adsorbent, natural pond liquid is carried out preliminary treatment absorption NH
3-N, saturated absorption NH
3Flyash behind the-N is as the nitrogenous source in the fertilizer raw material;
The natural pond slag utilizes step, with saturated absorption NH
3The flyash of-N adds all natural pond slags, and allocates inorganic N, P, the K element fertilizer of predetermined amount into, produces organic fertilizer product.
2. domestic waste comprehensive utilization as claimed in claim 1 and processing method; It is characterized in that; Above marsh gas purifying and utilizing in the step, the catalyst that is adopted is alundum (Al or magnesia, absorbent solution is with the aqua calcis of pH value allotment to 8 ~ 9.
3. domestic waste comprehensive utilization as claimed in claim 1 and processing method is characterized in that the content of N, P, K element accounts for 20% ~ 30% of gross weight.
4. domestic waste comprehensive utilization as claimed in claim 1 and processing method; It is characterized in that; At marsh gas purifying and utilize in the production process that makes processing that carbon dioxide separates out and natural pond slag utilize fertilizer in the step in the step and need to use thermal source, and the thermal source that adopts is made the burning of the biogas that the natural pond step produced by oneself.
5. domestic waste as claimed in claim 1 comprehensive utilization and processing method is characterized in that, the water source that the refuse classification step is adopted is the natural pond liquid or the sanitary sewage of dissolving and handling.
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