CN112024575A - Method for treating kitchen waste biogas residues by using microbial agent - Google Patents
Method for treating kitchen waste biogas residues by using microbial agent Download PDFInfo
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- CN112024575A CN112024575A CN202010890962.4A CN202010890962A CN112024575A CN 112024575 A CN112024575 A CN 112024575A CN 202010890962 A CN202010890962 A CN 202010890962A CN 112024575 A CN112024575 A CN 112024575A
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- 230000000813 microbial effect Effects 0.000 title claims abstract description 56
- 239000010806 kitchen waste Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 70
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 54
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000007787 solid Substances 0.000 claims abstract description 39
- 238000000855 fermentation Methods 0.000 claims abstract description 37
- 230000004151 fermentation Effects 0.000 claims abstract description 33
- ZXLOSLWIGFGPIU-UHFFFAOYSA-N 1-ethyl-3-methyl-1,2-dihydroimidazol-1-ium;acetate Chemical compound CC(O)=O.CCN1CN(C)C=C1 ZXLOSLWIGFGPIU-UHFFFAOYSA-N 0.000 claims abstract description 28
- ZDIRKWICVFDSNX-UHFFFAOYSA-N diethyl phosphate 1-ethyl-3-methyl-1,2-dihydroimidazol-1-ium Chemical compound P(=O)(OCC)(OCC)O.C(C)N1CN(C=C1)C ZDIRKWICVFDSNX-UHFFFAOYSA-N 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000440 bentonite Substances 0.000 claims abstract description 21
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 21
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000004310 lactic acid Substances 0.000 claims abstract description 20
- 235000014655 lactic acid Nutrition 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 20
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000002131 composite material Substances 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 10
- -1 sawdust Chemical compound 0.000 claims abstract description 10
- 238000005237 degreasing agent Methods 0.000 claims abstract description 8
- 239000013527 degreasing agent Substances 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 30
- 239000002068 microbial inoculum Substances 0.000 claims description 26
- 239000004519 grease Substances 0.000 claims description 25
- 150000001875 compounds Chemical class 0.000 claims description 20
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 10
- 239000001110 calcium chloride Substances 0.000 claims description 10
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 10
- 240000006439 Aspergillus oryzae Species 0.000 claims description 9
- 235000002247 Aspergillus oryzae Nutrition 0.000 claims description 9
- 241000589152 Azotobacter chroococcum Species 0.000 claims description 9
- 241000194108 Bacillus licheniformis Species 0.000 claims description 9
- 241000223261 Trichoderma viride Species 0.000 claims description 9
- 241000235015 Yarrowia lipolytica Species 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000005273 aeration Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 abstract description 22
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 11
- 150000003839 salts Chemical class 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 238000006731 degradation reaction Methods 0.000 abstract description 4
- 230000018044 dehydration Effects 0.000 abstract description 3
- 238000006297 dehydration reaction Methods 0.000 abstract description 3
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 5
- 239000002361 compost Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003337 fertilizer Substances 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- XNCMOUSLNOHBKY-UHFFFAOYSA-H iron(3+);trisulfate;heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O XNCMOUSLNOHBKY-UHFFFAOYSA-H 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004332 deodorization Methods 0.000 description 2
- 230000012010 growth Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002054 inoculum Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- XIYUIMLQTKODPS-UHFFFAOYSA-M 1-ethyl-3-methylimidazol-3-ium;acetate Chemical compound CC([O-])=O.CC[N+]=1C=CN(C)C=1 XIYUIMLQTKODPS-UHFFFAOYSA-M 0.000 description 1
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- WQHONKDTTOGZPR-UHFFFAOYSA-N [O-2].[O-2].[Mn+2].[Fe+2] Chemical compound [O-2].[O-2].[Mn+2].[Fe+2] WQHONKDTTOGZPR-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 235000021120 animal protein Nutrition 0.000 description 1
- 230000008485 antagonism Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- HQWOEDCLDNFWEV-UHFFFAOYSA-M diethyl phosphate;1-ethyl-3-methylimidazol-3-ium Chemical compound CC[N+]=1C=CN(C)C=1.CCOP([O-])(=O)OCC HQWOEDCLDNFWEV-UHFFFAOYSA-M 0.000 description 1
- YWEUIGNSBFLMFL-UHFFFAOYSA-N diphosphonate Chemical compound O=P(=O)OP(=O)=O YWEUIGNSBFLMFL-UHFFFAOYSA-N 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005541 medical transmission Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009335 monocropping Methods 0.000 description 1
- 235000021049 nutrient content Nutrition 0.000 description 1
- 239000003895 organic fertilizer Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- DLYUQMMRRRQYAE-UHFFFAOYSA-N phosphorus pentoxide Inorganic materials O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000006041 probiotic Substances 0.000 description 1
- 230000000529 probiotic effect Effects 0.000 description 1
- 235000018291 probiotics Nutrition 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 235000018102 proteins Nutrition 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for treating kitchen waste biogas residue by using a microbial agent, which comprises the following steps of a, mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial agent and water to prepare the biogas residue treating agent; b. mixing the biogas residue treating agent and the biogas residue in the step a for fermentation treatment; c. continuously aerating the fermented biogas residues under natural conditions to obtain solid residues; d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation; e. adding a degreasing agent to the solid residue separated in step d; the biogas residues after anaerobic fermentation are subjected to secondary treatment for decomposition and degradation, so that harmful substances such as oil, salt, heavy metals and the like in the biogas residues are further removed, the dehydration performance of the biogas residues is improved, the water content of the kitchen biogas residues is reduced to below 50%, and the kitchen biogas residues do not contain any harmful substances, so that the further utilization of the biogas residues is promoted.
Description
Technical Field
The invention relates to the field of kitchen waste treatment, in particular to a method for treating kitchen waste biogas residues by using a microbial agent.
Background
The kitchen biogas residue contains more comprehensive nutrients and rich organic matters, and the main nutrient contents are as follows: 30 to 50 percent of organic matter, 10 to 20 percent of humic acid, 0.8 to 2.0 percent of total nitrogen, 0.4 to 1.20 percent of total phosphorus and 0.6 to 2.0 percent of total potassium. At present, due to the technical limit, domestic treatment of the kitchen biogas residues mainly has two modes: one is to prepare the feed rich in biological protein by a special disinfection process; one is to convert the waste into high-quality biological fertilizer by composting. The feed produced by the kitchen biogas residues is generally treated by the procedures of sorting, cooking, squeezing and deoiling, but certain potential safety hazards still exist due to the special properties of the kitchen waste: firstly, because the protein structure is extremely complex, the high temperature can not guarantee to kill all viruses; secondly, after high-temperature heating, acid value and peroxide value in various grease in the kitchen biogas residue cannot be removed; thirdly, the kitchen biogas residues contain animal-derived components, and scientific data shows that the risk of disease transmission can be caused when homologous animal proteins are used for feeding the same animals. Therefore, the production of the biological fertilizer by using the biogas residues becomes a main trend of biogas residue treatment. The biological fertilizer produced by the kitchen biogas residues has multiple advantages: firstly, the improvement of soil organic matters is accelerated, the soil fertility is recovered, the self-cleaning function of the soil is recovered, and the soil is prevented from hardening and desertification; secondly, a strong soil probiotic environment is formed, the capability of resisting diseases and insect pests is improved, the use of pesticides is reduced, continuous cropping obstacles are relieved, and agricultural products meet export standards; thirdly, the conversion rate of the organic fertilizer is improved, the application of chemical fertilizer is reduced, the quality of agricultural products is improved, and the yield and the efficiency are increased; fourthly, the kitchen waste is adopted for manufacturing, the cost is lower, and farmers can use the kitchen waste. However, investigation finds that the treatment of domestic kitchen biogas residues is still in an exploration stage, the technical level is not mature enough, the problems are more, and the problems are mainly reflected in that: one is the deodorization technique in the biological treatment process. During the fermentation process, organic substances such as amino acids are decomposed by microorganisms to generate odor. Therefore, how to efficiently and economically solve the deodorization problem needs further research. And secondly, the influence of salt and grease in the kitchen waste on the compost quality. The quality of the compost is influenced by factors such as the content of grease and the content of salt in the kitchen waste to a certain extent, the high-salt compost product can inhibit the growth of plants, and the soil can be salinized if the high-salt compost product is used for a long time. Thirdly, the inoculum has a great influence on the content of residual metal, and the agricultural heavy metal risk of the biogas residues and the biogas slurry is serious.
Disclosure of Invention
In view of the above, the present invention is directed to a method for treating kitchen waste biogas residue with a microbial agent, wherein the biogas residue after anaerobic fermentation is treated again to further remove harmful substances such as oil, salt, and heavy metals in the biogas residue, improve the dehydration performance of the biogas residue, and promote further utilization of the biogas residue.
The method for treating the kitchen waste biogas residues by using the microbial agent comprises the following steps: a. mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial inoculum and water to prepare a biogas residue treating agent;
b. mixing the biogas residue treating agent and the biogas residue in the step a for fermentation treatment;
c. continuously aerating the fermented biogas residues under natural conditions to obtain solid residues;
d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation;
e. adding a degreasing agent to the solid residue separated in step d;
further, in the step a, the biogas residue treating agent comprises, by weight, 10-20 parts of activated carbon, 5-10 parts of bentonite, 5-10 parts of sawdust, 2-6 parts of iron sulfate heptahydrate, 1-3 parts of kitchen waste lactic acid fermentation liquor, 1-3 parts of a microbial composite microbial inoculum and 50-60 parts of water;
further, in the step a, the microbial compound microbial inoculum is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum according to the weight part ratio of 1.5:1:1.2:2: 1;
further, in the step b, stacking fermentation is adopted for 15-20 days, and the stack is turned once every 2-4 days;
further, in the step c, aeration treatment is carried out for 1-3 days;
further, in the step d, the weight ratio of 1-ethyl-3-methylimidazole acetate to 1-ethyl-3-methylimidazole diethyl phosphate is 3: the total weight of the 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added accounts for 30-40% of the solid residue;
further, in the step e, the grease removing agent raw material comprises the following components in parts by weight: 50-70 parts of fly ash, 3-8 parts of sodium hydroxide and 1-5 parts of calcium chloride.
The invention has the beneficial effects that: according to the method for treating the kitchen waste biogas residues by using the microbial agent, disclosed by the invention, the biogas residues after anaerobic fermentation are subjected to secondary treatment for decomposition and degradation, so that harmful substances such as oil, salt and heavy metals in the biogas residues are further removed, the dehydration performance of the biogas residues is improved, the water content of the kitchen biogas residues can be reduced to below 50%, harmful chemical substances can be thoroughly removed, and the further utilization of the biogas residues is promoted.
Detailed Description
The method for treating the kitchen waste biogas residue by using the microbial agent comprises the following steps: a. mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial inoculum and water to prepare a biogas residue treating agent;
b. mixing the biogas residue treating agent and the biogas residue in the step a for fermentation treatment; the special three-dimensional intercommunicated porous network structure of the activated carbon is adopted to provide a loaded space for the microbial compound bacteria agent and has good permeability, a favorable growth space is provided for the microorganisms, the activity of the microbial compound bacteria agent is improved to generate antioxidant substances, a complex and stable ecological system is formed, the microorganisms in the three-dimensional intercommunicated porous network structure are rapidly propagated and maintained at a relatively stable higher level, in the fermentation process, the special three-dimensional intercommunicated porous network structure of the activated carbon is a channel for the microorganisms to absorb nutrient substances in the environment and carry out mass transfer, the life activities in the fermentation all present three-dimensional diversity, the mass transfer is more uniform, the fermentation is more sufficient, the contact time and the contact area with fermentation raw materials in the fermentation process are ensured, the mass transfer efficiency is high, and meanwhile, the adsorptive harmful substances (such as heavy metals) of the activated carbon with special pores are utilized to absorb the harmful substances, and the grease components in the biogas residues are immersed in the activated carbon and fully contacted with the microbial compound bacteria to degrade and decompose harmful substances, and the harmful substances which cannot be thoroughly and clearly solidified, locked and passivated in the three-dimensional intercommunicated holes of the activated carbon cannot be separated out. Similarly, the combination of the activated carbon, the bentonite and the sawdust with three-dimensional intercommunicated porous network structures is realized by comprehensively utilizing different pore structures of different materials, so that the microbial compound inoculant loaded on the activated carbon, the bentonite and the sawdust forms a certain gradient space to play a role in complementation and synergy, and has good heat preservation effect, thereby providing a good growth environment for microbes, ensuring that flora can be biodegraded under proper conditions, and effectively avoiding the generation of antagonism between inoculated microbes and indigenous microbes. The kitchen waste lactic acid fermentation liquor is used for removing heavy metals in biogas residues by using substances generated by anaerobic fermentation of kitchen waste, and the heavy metals in the biogas residues can be effectively removed. In conclusion, the biogas residue treating agent is a mutual synergistic and cooperative action of different substances, degrades and decomposes harmful substances in biogas residue, and solidifies, locks and passivates the harmful substances which cannot be thoroughly treated so that the harmful substances are not separated out; the specific microbial compound bacteria can also improve the fat degradation rate of specific components in the kitchen waste biogas residues and reduce the nitrogen loss rate.
c. Continuously aerating the fermented biogas residues under natural conditions to obtain solid residues;
d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation; the fermented biogas residues are treated again in a continuous aeration mode, so that the degradation rate of organic matters can be effectively improved, and the 1-ethyl-3-methylimidazolium acetate and 1-ethyl-3-methylimidazolium diethyl phosphate can promote the dissolution of organic matters in biogas residue flocs, fully degrade the organic matters and treat the organic matters more thoroughly;
e. adding a degreasing agent to the solid residue separated in step d; and finally removing the grease possibly remaining in the biogas residues to ensure that the biogas residues do not contain any harmful substances.
In the embodiment, in the step a, the biogas residue treating agent comprises, by weight, 10-20 parts of activated carbon, 5-10 parts of bentonite, 5-10 parts of sawdust, 2-6 parts of iron sulfate heptahydrate, 1-3 parts of kitchen waste lactic acid fermentation liquor, 1-3 parts of a microbial composite microbial inoculum and 50-60 parts of water.
In the embodiment, in the step a, the microbial compound bacteria agent is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum in a weight ratio of 1.5:1:1.2:2: 1;
in the embodiment, in the step b, stacking fermentation is adopted for 15-20 days, and the stack is turned once every 2-4 days;
in the embodiment, in the step c, aeration treatment is carried out for 1 to 3 days;
in this example, in step d, the weight ratio of 1-ethyl-3-methylimidazole acetate to 1-ethyl-3-methylimidazole diethyl phosphate was 3: the total weight of the 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added accounts for 30-40% of the solid residue;
in this embodiment, in step e, the grease removing agent raw material comprises the following components in parts by weight: 50-70 parts of fly ash, 3-8 parts of sodium hydroxide and 1-5 parts of calcium chloride; heating the fly ash and a sodium hydroxide aqueous solution to 90-100 ℃ for reaction for more than 20 hours, washing by adopting a centrifugal separation method, then adding a calcium chloride aqueous solution, carrying out calcium saturation treatment, and drying to obtain powder. The degreasing agent can solidify the residual grease, so that the residual grease can not seep or separate out under any state, the principle of the degreasing agent is similar to that of the activated carbon with a three-dimensional intercommunicated porous network structure, and the degreasing agent adopted in the last step is mainly used for treating the grease residual in the biogas residues, so that the degreasing agent has stronger pertinence and can thoroughly absorb the residual grease.
The biogas residue treated by the method for treating the kitchen waste biogas residue by using the microbial agent can reduce the water content of the kitchen biogas residue to be below 50%, does not contain any harmful substance, and promotes the further utilization of the biogas residue. The absence of any harmful chemical substances in the present invention means that the harmful substances are completely removed or even a few heavy metal residues or grease residues are permanently solidified and passivated, so that the inherent properties are lost.
Example one
The method for treating the kitchen waste biogas residue by using the microbial agent comprises the following steps: a. mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial inoculum and water to prepare a biogas residue treating agent; the biogas residue treating agent comprises, by weight, 10 parts of activated carbon, 5 parts of bentonite, 5 parts of sawdust, 2 parts of ferric sulfate heptahydrate, 1 part of kitchen waste lactic acid fermentation liquor, 1 part of a microbial composite microbial inoculum and 50 parts of water; the microbial compound microbial inoculum is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum according to the weight part ratio of 1.5:1:1.2:2: 1;
b. b, mixing the biogas residue treating agent in the step b with biogas residues, stacking and fermenting for 15 days, and turning over once every 2 days;
c. continuously aerating the fermented biogas residues for 1-3 days under natural conditions to obtain solid residues;
d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation; the weight ratio of 1-ethyl-3-methylimidazole acetate to 1-ethyl-3-methylimidazole diethyl phosphate is 3: the total weight of the 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added was 30% of the solid residue;
e. d, adding a grease removing agent into the solid residue separated in the step d, wherein the grease removing agent comprises the following raw materials in parts by weight: 50 parts of fly ash, 3 parts of sodium hydroxide and 1 part of calcium chloride.
Example two
The method for treating the kitchen waste biogas residue by using the microbial agent comprises the following steps: a. mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial inoculum and water to prepare a biogas residue treating agent; the biogas residue treating agent comprises, by weight, 20 parts of activated carbon, 10 parts of bentonite, 10 parts of sawdust, 6 parts of iron sulfate heptahydrate, 3 parts of kitchen waste lactic acid fermentation liquor, 3 parts of a microbial compound microbial inoculum and 60 parts of water; the microbial compound microbial inoculum is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum according to the weight part ratio of 1.5:1:1.2:2: 1;
b. b, mixing the biogas residue treating agent and the biogas residue in the step b, stacking and fermenting for 20 days, and turning over once every 4 days;
c. continuously aerating the fermented biogas residues for 1-3 days under natural conditions to obtain solid residues;
d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation; the weight ratio of 1-ethyl-3-methylimidazole acetate to 1-ethyl-3-methylimidazole diethyl phosphate is 3: the total weight of the 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added is 40% of the solid residue;
e. d, adding a grease removing agent into the solid residue separated in the step d, wherein the grease removing agent comprises the following raw materials in parts by weight: 70 parts of fly ash, 8 parts of sodium hydroxide and 5 parts of calcium chloride.
EXAMPLE III
The method for treating the kitchen waste biogas residue by using the microbial agent comprises the following steps: a. mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial inoculum and water to prepare a biogas residue treating agent; the biogas residue treating agent comprises, by weight, 10 parts of activated carbon, 10 parts of bentonite, 5 parts of sawdust, 6 parts of ferric sulfate heptahydrate, 1 part of kitchen waste lactic acid fermentation liquor, 3 parts of a microbial compound microbial inoculum and 50 parts of water; the microbial compound microbial inoculum is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum according to the weight part ratio of 1.5:1:1.2:2: 1;
b. b, mixing the biogas residue treating agent in the step b with biogas residues, stacking and fermenting for 15 days, and turning over once every 4 days;
c. continuously aerating the fermented biogas residues for 1-3 days under natural conditions to obtain solid residues;
d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation; the weight ratio of 1-ethyl-3-methylimidazole acetate to 1-ethyl-3-methylimidazole diethyl phosphate is 3: the total weight of the 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added was 30% of the solid residue;
e. d, adding a grease removing agent into the solid residue separated in the step d, wherein the grease removing agent comprises the following raw materials in parts by weight: 50 parts of fly ash, 8 parts of sodium hydroxide and 1 part of calcium chloride.
Example four
The method for treating the kitchen waste biogas residue by using the microbial agent comprises the following steps: a. mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial inoculum and water to prepare a biogas residue treating agent; the biogas residue treating agent comprises, by weight, 15 parts of activated carbon, 5 parts of bentonite, 8 parts of sawdust, 3 parts of iron sulfate heptahydrate, 2 parts of kitchen waste lactic acid fermentation liquor, 1 part of a microbial compound microbial inoculum and 55 parts of water; the microbial compound microbial inoculum is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum according to the weight part ratio of 1.5:1:1.2:2: 1;
b. b, mixing the biogas residue treating agent in the step b with biogas residues, stacking and fermenting for 17 days, and turning over once every 3 days;
c. continuously aerating the fermented biogas residues for 1-3 days under natural conditions to obtain solid residues;
d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation; the weight ratio of 1-ethyl-3-methylimidazole acetate to 1-ethyl-3-methylimidazole diethyl phosphate is 3: the total weight of the 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added was 35% of the solid residue;
e. d, adding a grease removing agent into the solid residue separated in the step d, wherein the grease removing agent comprises the following raw materials in parts by weight: 55 parts of fly ash, 5 parts of sodium hydroxide and 3 parts of calcium chloride.
EXAMPLE five
The method for treating the kitchen waste biogas residue by using the microbial agent comprises the following steps: a. mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial inoculum and water to prepare a biogas residue treating agent; the biogas residue treating agent comprises, by weight, 15 parts of activated carbon, 7 parts of bentonite, 7 parts of sawdust, 4 parts of ferric sulfate heptahydrate, 2 parts of kitchen waste lactic acid fermentation liquor, 2 parts of a microbial compound microbial inoculum and 55 parts of water; the microbial compound microbial inoculum is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum according to the weight part ratio of 1.5:1:1.2:2: 1;
b. b, mixing the biogas residue treating agent in the step b with biogas residues, stacking and fermenting for 17 days, and turning over once every 3 days;
c. continuously aerating the fermented biogas residues for 1-3 days under natural conditions to obtain solid residues;
d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation; the weight ratio of 1-ethyl-3-methylimidazole acetate to 1-ethyl-3-methylimidazole diethyl phosphate is 3: the total weight of the 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added was 35% of the solid residue;
e. d, adding a grease removing agent into the solid residue separated in the step d, wherein the grease removing agent comprises the following raw materials in parts by weight: 60 parts of fly ash, 5 parts of sodium hydroxide and 3 parts of calcium chloride.
EXAMPLE six
The method for treating the kitchen waste biogas residue by using the microbial agent comprises the following steps: a. mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial inoculum and water to prepare a biogas residue treating agent; the biogas residue treating agent comprises, by weight, 20 parts of activated carbon, 6 parts of bentonite, 8 parts of sawdust, 5 parts of iron sulfate heptahydrate, 3 parts of kitchen waste lactic acid fermentation liquor, 2 parts of a microbial compound microbial inoculum and 58 parts of water; the microbial compound microbial inoculum is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum according to the weight part ratio of 1.5:1:1.2:2: 1;
b. b, mixing the biogas residue treating agent in the step b with biogas residues, stacking and fermenting for 19 days, and turning over once every 3 days;
c. continuously aerating the fermented biogas residues for 1-3 days under natural conditions to obtain solid residues;
d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation; the weight ratio of 1-ethyl-3-methylimidazole acetate to 1-ethyl-3-methylimidazole diethyl phosphate is 3: the total weight of the 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added was 35% of the solid residue;
e. d, adding a grease removing agent into the solid residue separated in the step d, wherein the grease removing agent comprises the following raw materials in parts by weight: 65 parts of fly ash, 4 parts of sodium hydroxide and 2 parts of calcium chloride.
The kitchen waste biogas residue nutrient and the water content treated by the treatment method of the embodiment of the invention
| Total nitrogen% | 2.91 |
| Phosphorus pentoxide% | 2.95 |
| Potassium oxide% | 0.75 |
| Organic matter% | 76.89 |
| Water content% | 44.21 |
The kitchen waste biogas residues before treatment contain heavy metals with different forms, the heavy metals have water-soluble forms (can be directly absorbed and utilized), exchangeable forms (can be easily absorbed by plants), carbonate combined forms and iron-manganese oxide combined forms (when external conditions change (such as ph and Eh), the combined forms can be released into a water phase again so as to be absorbed and utilized, and the heavy metals in the kitchen waste biogas residues after treatment all present stable organic combined forms (are difficult to convert and be absorbed by plants) and residue forms (are ineffective to organisms).
In the above examples, examples 2 to 6 all had better effects than example 1.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A method for treating kitchen waste biogas residues by using a microbial agent is characterized by comprising the following steps: the method comprises the following steps: a. mixing activated carbon with a three-dimensional intercommunicated porous network structure, bentonite, sawdust, iron sulfate heptahydrate, kitchen waste lactic acid fermentation liquor, a microbial composite microbial inoculum and water to prepare a biogas residue treating agent;
b. mixing the biogas residue treating agent and the biogas residue in the step a for fermentation treatment;
c. continuously aerating the fermented biogas residues under natural conditions to obtain solid residues;
d. adding 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate into the solid residue, and then carrying out solid-liquid separation;
e. adding a degreasing agent to the solid residue separated in step d.
2. The method for treating the kitchen waste biogas residue by using the microbial agent as claimed in claim 1, which is characterized in that: in the step a, the biogas residue treating agent comprises, by weight, 10-20 parts of activated carbon, 5-10 parts of bentonite, 5-10 parts of sawdust, 2-6 parts of iron sulfate heptahydrate, 1-3 parts of kitchen waste lactic acid fermentation liquor, 1-3 parts of a microbial compound microbial inoculum and 50-60 parts of water.
3. The method for treating the kitchen waste biogas residue by using the microbial agent as claimed in claim 2, which is characterized in that: in the step a, the microbial compound microbial inoculum is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum according to the weight part ratio of 1.5:1:1.2:2: 1.
4. The method for treating the kitchen waste biogas residue by using the microbial agent as claimed in claim 3, wherein the method comprises the following steps: in the step b, stacking fermentation is adopted for 15-20 days, and the stack is turned once every 2-4 days.
5. The method for treating the kitchen waste biogas residue by using the microbial agent as claimed in claim 4, wherein the method comprises the following steps: in the step c, aeration treatment is carried out for 1 to 3 days.
6. The method for treating the kitchen waste biogas residue by using the microbial agent as claimed in claim 5, wherein the method comprises the following steps: in the step d, the weight ratio of 1-ethyl-3-methylimidazole acetate to 1-ethyl-3-methylimidazole diethyl phosphate is 3: the total weight of 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added is 30-40% of the solid residue.
7. The method for treating the kitchen waste biogas residue by using the microbial agent as claimed in claim 6, which is characterized in that: in the step e, the grease removing agent comprises the following raw materials in parts by weight: 50-70 parts of fly ash, 3-8 parts of sodium hydroxide and 1-5 parts of calcium chloride.
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