CN112024575B - 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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- CN112024575B CN112024575B CN202010890962.4A CN202010890962A CN112024575B CN 112024575 B CN112024575 B CN 112024575B CN 202010890962 A CN202010890962 A CN 202010890962A CN 112024575 B CN112024575 B CN 112024575B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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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
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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 through composting treatment. 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, high temperature can not guarantee to kill all viruses; secondly, after high-temperature heating, acid values and peroxide values of various grease in the kitchen biogas residues 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 restored, the self-cleaning function of the soil is restored, 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 domestic treatment of kitchen biogas residues is still in an exploration stage, the technical level is not mature enough, and the problems are more, and mainly appear as follows: 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 to be further researched. Secondly, the influence of salinity and grease in the kitchen waste on the quality of the compost. The quality of compost is affected by factors such as the content of grease and 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 aims to provide a method for treating kitchen waste biogas residues by using a microbial agent, wherein the biogas residues after anaerobic fermentation are treated again to further remove harmful substances such as oil, salt, heavy metals, etc. in the biogas residues, improve the dehydration performance of the biogas residues, and promote the further utilization of the biogas residues.
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. 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 in a weight ratio of 1.5;
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 the 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 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. 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 show 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, meanwhile, the adsorptive property of the activated carbon with special pores is utilized to absorb harmful substances (such as heavy metals), the grease components in biogas residues are immersed in the activated carbon and fully contacted with the microbial compound bacteria, the degradation and decomposition of the harmful substances are carried out, and the harmful substances can not be solidified and passivated in the three-dimensional pores of the activated carbon thoroughly and 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 residue under natural conditions to obtain solid residue;
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 compound microbial inoculum and 50-60 parts of water.
In the embodiment, in the step a, the microbial compound bacterial agent is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum in a weight ratio of 1.5;
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 grease removing agent can solidify the residual grease, so that the residual grease can not seep or separate out under any state, the principle of the grease removing agent is similar to that of the activated carbon with the three-dimensional intercommunicated porous network structure, and the grease removing agent adopted in the last step is mainly used for treating the grease residual in the biogas residues, so that the grease removing 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 invention does not contain any harmful chemical substances means that the harmful substances are thoroughly cleared, or even a little heavy metal residues or grease residues are permanently solidified and passivated, so that the inherent properties of the heavy metal residues or the grease residues 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 ratio of 1.5;
b. mixing the biogas residue treating agent in the step b with biogas residue, 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 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 bacterial agent is a mixture of Aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum in a weight ratio of 1.5;
b. mixing the biogas residue treating agent in the step b with biogas residue, 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 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate added was 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 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; 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 ratio of 1.5;
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 residue for 1-3 days under natural conditions to obtain solid residue;
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 added 1, 1-ethyl-3-methylimidazole acetate and 1-ethyl-3-methylimidazole diethyl phosphate 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 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; 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 bacterial agent is a mixture of Aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum in a weight ratio of 1.5;
b. mixing the biogas residue treating agent in the step b with biogas residue, 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 added 1, 1-ethyl-3-methylimidazole acetate and diethyl 1-ethyl-3-methylimidazole phosphate 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 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; 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 ratio of 1.5;
b. mixing the biogas residue treating agent in the step b with biogas residue, stacking and fermenting for 17 days, and turning over once every 3 days;
c. continuously aerating the fermented biogas residue for 1-3 days under natural conditions to obtain solid residue;
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 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 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; 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 bacterial agent is a mixture of Aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum in a weight ratio of 1.5;
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 residue for 1-3 days under natural conditions to obtain solid residue;
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 added 1, 1-ethyl-3-methylimidazole acetate and diethyl 1-ethyl-3-methylimidazole phosphate 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 water content treated by the first 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, and the heavy metals have water soluble forms (capable of being directly absorbed and utilized), exchangeable forms (easy to be absorbed by plants), carbonate binding forms and iron-manganese oxide binding forms (when external conditions change (such as ph and Eh), the heavy metals in the kitchen waste biogas residues are released into a water phase again so as to be absorbed and utilized.
In the above examples, the effects of examples 2 to 6 are all superior to those of 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 (3)
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; 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 ferric 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; the microbial compound microbial inoculum is a mixture of aspergillus oryzae, bacillus licheniformis, candida lipolytica, trichoderma viride and azotobacter chroococcum according to the weight ratio of 1.5;
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; 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;
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: 50-70 parts of fly ash, 3-8 parts of sodium hydroxide and 1-5 parts of calcium chloride.
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 b, the piling fermentation is adopted for 15-20 days, and the pile is turned once every 2-4 days.
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 c, aeration treatment is carried out for 1 to 3 days.
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| CN107325991A (en) * | 2017-08-28 | 2017-11-07 | 广州惜福生态科技有限公司 | Composite bacteria agent of degraded kitchen garbage and preparation method thereof and the plastics and the clean method of foam class waste polluted by kitchen garbage |
| CN107469797B (en) * | 2017-09-11 | 2019-02-22 | 济南大学 | A kind of preparation method of the modified porous magnetic composite microsphere of dimercaptosuccinic acid |
| CN107971324B (en) * | 2017-11-24 | 2020-07-17 | 中国科学院城市环境研究所 | Method and device for reducing and recycling kitchen waste anaerobic fermentation biogas residues |
| CN109078960A (en) * | 2018-08-27 | 2018-12-25 | 安徽农业大学 | A kind of method of ion liquid dissolving tealeaf residue |
| CN110092676A (en) * | 2019-05-14 | 2019-08-06 | 连云港金驰生物科技有限公司 | A method of biological organic fertilizer is prepared with kitchen garbage |
| CN111186917A (en) * | 2020-01-15 | 2020-05-22 | 泸州品创科技有限公司 | Method for treating residues of brewing wastewater by using microbial agent |
| AU2020101383A4 (en) * | 2020-07-16 | 2020-08-20 | Zhejiang University Of Science And Technology | Biogas residue-based mechanized earthworm composting breeding system |
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