CN117757630A - Method for preparing composite bacterial carbon source by utilizing kitchen waste, composite bacterial carbon source and application - Google Patents
Method for preparing composite bacterial carbon source by utilizing kitchen waste, composite bacterial carbon source and application Download PDFInfo
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Classifications
-
- 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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The application provides a method for preparing a composite bacterial carbon source by utilizing kitchen waste, the composite bacterial carbon source and application. The method comprises the following steps: crushing, dewatering and grinding kitchen waste to prepare an organic matter mixture; and mixing the organic matter mixture with biological strains to obtain a composite strain carbon source. Kitchen waste is used as a raw material, an organic matter mixture is prepared through crushing, dewatering and grinding, and the organic matter mixture is mixed with biological bacteria to prepare the composite bacteria carbon source. The composite bacterial carbon source can safely and efficiently treat sewage. The method takes the kitchen waste and the biological strains which are abundant in source and low in cost as raw materials, and prepares the kitchen waste and the biological strains into the composite strain carbon source for sewage treatment, so that harmless treatment and resource recycling of the kitchen waste are realized.
Description
Technical Field
The application relates to the technical field of garbage regeneration treatment, in particular to a method for preparing a composite bacterial carbon source by utilizing kitchen garbage, the composite bacterial carbon source and application.
Background
At the same time of high-speed development of economy, serious environmental pollution and damage also threaten the health of people, and especially water pollution has caused serious ecological imbalance. The natural environment loses the original nitrogen circulation self-cleaning capability due to excessive pollution, so that reasonable treatment of sewage is a necessary law for restoring the natural ecology.
The biochemical treatment method has the advantages of simple process, remarkable effect, low cost, pure nature, environmental protection, no secondary pollution and the like, and is the most main sewage treatment process. The biochemical treatment method is a technology for biological treatment of sewage by using activated sludge as main body, and specifically utilizes metabolism of microorganism inhabiting on activated sludge to convert organic pollutant in dissolved and colloid state in sewage into stable harmless substance, i.e. the soluble organic pollutant in sewage is directly taken up by bacteria and is metabolically decomposed into inorganic matter such as H 2 O and CO 2 Etc.; meanwhile, the fungi have the function of decomposing carbohydrate fat, protein and other nitrogen-containing compounds.
In the bacterial reproduction process, a large amount of organic matters are consumed, and the reproduction of bacteria is satisfied by externally adding a carbon source. If the carbon source is insufficient, the denitrification removal rate is low, and the total nitrogen content of the effluent exceeds the standard. Common carbon sources include single carbon sources such as methanol, acetic acid, sodium acetate, glucose and the like, biomass carbon sources, composite carbon sources and the like. However, the above carbon sources have disadvantages of high storage requirements, high price, poor stability, or inconvenient transportation.
Disclosure of Invention
Based on the above, one or more embodiments of the present application provide a method for preparing a composite bacterial carbon source by using kitchen waste, the composite bacterial carbon source and applications thereof, wherein the method is safe, nontoxic, low in cost and good in stability. The technical proposal comprises:
according to a first aspect of embodiments of the present application, there is provided a method for preparing a composite bacterial carbon source by using kitchen waste, including the following steps:
crushing, dewatering and grinding kitchen waste to prepare an organic matter mixture;
and mixing the organic matter mixture with biological strains to obtain a composite strain carbon source.
In one embodiment, the biological species includes one or more of an aerobic species and an anaerobic species.
In one embodiment, the addition amount of the biological strain is 3-5 wt% based on the total mass of the organic matter mixture.
In one embodiment, the organic matter mixture includes starch, protein, cellulose, lipids, and inorganic salts.
In one embodiment, the step of preparing the organic matter mixture comprises:
crushing kitchen waste to obtain crushed waste;
carrying out solid-liquid separation on the crushed garbage to obtain semi-wet garbage;
extruding the semi-wet garbage to obtain granular garbage; and
homogenizing and grinding the granular garbage to obtain an organic matter mixture.
In one embodiment, the preparation method satisfies at least one of the following conditions (1) - (3):
(1) The water content in the semi-wet garbage is 40-50 wt%;
(2) The water content in the granular garbage is 3-5 wt%; and
(3) The water content of the organic matter mixture is 0.3-0.5 wt%.
In one embodiment, the preparation method satisfies at least one of the following conditions (1) - (3):
(1) The average particle size of the crushed garbage is 3.1 mm-5 mm;
(2) The average particle size of the granular garbage is 1 mm-3 mm; and
(3) The granularity of the organic matter mixture is 300-400 meshes.
In one embodiment, after mixing the organic matter mixture with the biological species and before obtaining the composite species carbon source, the method further comprises the steps of:
tabletting the mixture of the organic matter mixture and the biological strain mixture to prepare the composite strain carbon source of the tablet.
According to a second aspect of the embodiments of the present application, a composite bacterial carbon source is provided, and the composite bacterial carbon source is prepared by the preparation method described above.
According to a third aspect of the embodiment of the application, the application of the composite bacterial carbon source prepared by the method in sewage treatment is provided.
Compared with the prior art, the method has the following beneficial effects:
according to the method, kitchen waste is used as a raw material, the organic matter mixture is prepared through crushing, dewatering and grinding, and the organic matter mixture is mixed with biological bacteria to prepare the composite bacteria carbon source, so that the composite bacteria carbon source can safely, efficiently and continuously treat sewage. The method takes the kitchen waste and the biological strains which are abundant in source and low in cost as raw materials, and prepares the kitchen waste and the biological strains into the composite strain carbon source for sewage treatment, so that harmless treatment and resource recycling of the kitchen waste are realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of the preparation of a carbon source of a composite bacterial strain in tablet form in example 1 of the present application.
Detailed Description
The detailed description of the embodiments of the present application will be presented in order to make the above objects, features and advantages of the present application more obvious and understandable. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless specifically indicated otherwise, the various raw materials, reagents, instruments, equipment, and the like used in the present application are commercially available or may be prepared by existing methods.
In the present application, reference is made to "multiple", etc., the index is greater than or equal to 2 in number, as not particularly limited. For example, "one or more" means one kind or two or more kinds.
In this application, "optional," "optional," and "optional" refer to the presence or absence of, that is, either one of the two parallel schemes is selected from "with" or "without". If multiple "alternatives" occur in a technical solution, if no particular description exists and there is no contradiction or mutual constraint, then each "alternative" is independent.
In the present application, the technical features described in an open manner include a closed technical scheme composed of the listed features, and also include an open technical scheme including the listed features.
In this application, reference is made to a numerical interval (i.e., a numerical range), where the optional numerical distribution is considered continuous, and includes two numerical endpoints (i.e., a minimum value and a maximum value) of the numerical range, and each numerical value between the two numerical endpoints, unless otherwise indicated. Where a numerical range merely refers to integers within the numerical range, including both end integers of the numerical range, and each integer between the two ends, unless otherwise indicated, each integer is recited herein as directly, such as where t is an integer selected from 1-10, and where t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. Further, when a plurality of range description features or characteristics are provided, these ranges may be combined. In other words, unless otherwise indicated, the ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
The temperature parameter in the present application is not particularly limited, and may be a constant temperature treatment or may vary within a predetermined temperature range. It should be appreciated that the constant temperature process described allows the temperature to fluctuate within the accuracy of the instrument control. Allows for fluctuations within a range such as + -5 ℃, + -4 ℃, + -3 ℃, + -2 ℃, + -1 ℃.
In the application, the composite bacterial carbon source refers to an external organic carbon source added with biological bacterial and used in the domestic sewage treatment process.
The traditional composite carbon source is a novel composite carbon source capable of promoting rapid propagation of denitrification decarbonization and heterotrophic bacteria, and consists of small molecular acid, saccharides and short-chain alcohols. The biochemical performance is good, no toxic or harmful substances are contained, the quick start of a biochemical system of the refractory wastewater is facilitated, the denitrification rate is high, and the system is stable. However, the composite carbon source is liquid, and is not suitable for long-distance transportation and long-term storage.
Based on the above, the first aspect of the application provides a method for preparing a composite bacterial carbon source by utilizing kitchen waste, which comprises the steps of S10 to S20.
Step S10: crushing, dewatering and grinding kitchen waste to prepare an organic matter mixture.
In some of these embodiments, step S10 includes steps S11 to S14.
Step S11: crushing kitchen waste to obtain crushed waste.
In some embodiments, the average particle size of the crushed waste is 3.1mm to 5mm. Specifically, the average particle size of the crushed waste may be any specific value between 3.1mm and 5mm, including but not limited to 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, and the like.
Step S12: and (3) carrying out solid-liquid separation on the crushed garbage to obtain semi-wet garbage.
Specifically, the first water removal treatment of the crushed garbage is realized through solid-liquid separation.
In some embodiments, the semi-moist waste has a moisture content of 40wt% to 50wt%. Optionally, the moisture content of the semi-moist waste is 40-45 wt%.
Step S13: extruding the semi-wet garbage to obtain granular garbage.
Specifically, the second crushing treatment and the second dewatering treatment of the semi-wet garbage are realized through extrusion. Understandably, the water and oil filtered out in this step are collected in an oil separation tank of a sewage station, and then sent to a sewage treatment station for unified treatment.
In some embodiments, the particulate waste has an average particle size of 1mm to 3mm. Specifically, the average particle size of the crushed garbage may be any specific value between 1mm and 3mm, including but not limited to 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, and the like.
In some embodiments, the moisture content of the particulate waste is 3wt% to 5wt%. Optionally, the water content of the granular garbage is 3-4 wt%; further alternatively, the moisture content of the particulate waste is 3wt%.
Step S14: homogenizing and grinding the granular garbage to obtain an organic matter mixture.
In particular, the third water removal treatment of the granular waste is achieved by homogenization.
In some embodiments, homogenization of the particulate waste is achieved by means of electromagnetic heating.
In some embodiments, the organic mixture has a particle size of 300 mesh to 400 mesh. Specifically, the particle size of the organic matter mixture may be any specific value between 300 mesh and 400 mesh, including but not limited to 300 mesh, 310 mesh, 320 mesh, 330 mesh, 340 mesh, 350 mesh, 360 mesh, 370 mesh, 380 mesh, 390 mesh, or 400 mesh. Optionally, the granularity of the organic matter mixture is 350-400 meshes; further alternatively, the organic matter mixture has a particle size of 400 mesh.
In some of these embodiments, the organic matter mixture includes starch, protein, cellulose, lipids, and inorganic salts.
In some embodiments, the sum of the contents of starch, protein, cellulose, lipid, and inorganic salt is 95wt% to 97wt%.
In some embodiments, the organic mixture has a water content of 0.3wt% to 0.5wt%. Optionally, the water content in the organic matter mixture is 0.3wt% to 0.4wt%.
The kitchen garbage is food which is aged and spoiled and is obtained by sorting household garbage of urban residents, and discarding leftovers, pericarps, eggshells, tea residues, animal viscera, chinese medicinal residues, bones (chicken bones and fishbones), and the like. The main components comprise starch, protein, cellulose, lipid and inorganic salt. The organic matter mixture obtained after the kitchen garbage is treated has the components which are highly consistent with the components of the composite carbon source used by the domestic sewage treatment plant.
The composite strain carbon source prepared from kitchen waste is solid, the dosage is easy to control during use, the solid carbon source has a strong slow-release effect, the residence time in a sewage tank can reach 4-8 hours, and the phenomena of activated sludge expansion, foam and the like are not easy to occur.
The kitchen garbage has high organic matter content, including starch, protein, cellulose, fat, inorganic salt, etc. and has safe kitchen garbage components, low source cost and high application effect.
The starch is a high molecular carbohydrate, is a polysaccharide polymerized by glucose molecules, and is easy to be absorbed and utilized by microorganisms as an external carbon source, and the denitrification effect is good.
Proteins include complete proteins found in milk, eggs, meats, fish and incomplete proteins found in legumes, cereals, wheat and corn. The protein is a nutrient substance required by microorganism organism, and can regulate the content and proportion of acid and alkali substances, and maintain the relative stability of pH value, i.e. maintain pH in constant range.
Cellulose is widely used in coarse cereals, vegetables, fruits, mushrooms and bean products, is macromolecular polysaccharide composed of glucose, is the polysaccharide with the widest distribution and the highest content in the natural world, accounts for more than 50% of the carbon content in plants, is used as an external carbon source, is easy to be absorbed and utilized by microorganisms, has good denitrification effect and can be thoroughly decomposed by microorganisms.
Lipids are the generic term for fats, phospholipids, lipids, and the like, which are capable of providing energy to microorganisms and provide the desired fatty acids to the microorganisms.
The inorganic salt has multiple functions of buffering, neutralizing, precipitating and the like, and can effectively remove impurities and pollutants in the wastewater.
Step S20: mixing the organic matter mixture with biological strain to obtain the composite strain carbon source.
In some embodiments, the biological species includes one or more of an aerobic species and an anaerobic species. It is understood that the biological species may be selected from one or more aerobic species, may be selected from one or more anaerobic species, and may be selected from a combination of one or more aerobic species and one or more anaerobic species. The types and the number of the biological strains can be specifically selected according to the throwing places, the sewage properties and the like.
In some embodiments, the amount of the biological species added is 3wt% to 5wt% based on the total mass of the organic matter mixture.
In some embodiments, the temperature at which the organic matter mixture is mixed with the biological species is 28-32 ℃; the mixing time is 15-30 min.
In some embodiments, the above preparation method further comprises the following steps.
Tabletting the mixture of the organic matter mixture and the biological strain mixture to prepare the composite strain carbon source of the tablet.
In some embodiments, when the biological species is selected from aerobic species, the pressure of the tablet is 780mpa to 820mpa.
In some embodiments, the pressure of the compressed tablet is 580mpa to 620mpa when the biological bacterial species are selected from anaerobic bacterial species.
Understandably, the composite bacterial carbon source is prepared into tablets, so that the dissolution rate of the carbon source in sewage can be reduced, and the release duration can be prolonged, thereby achieving the effect of slow release. Further, the weight of the tablet is marked, and the tablet is more convenient to measure when in use. The traditional glucose carbon source dosage is not easy to control, and a great deal of bacteria are easy to multiply due to slight carelessness, so that sludge expansion is caused; in addition, the traditional liquid composite carbon source has obvious effect when being just put into the water, but is easy to flow along with sewage and cannot continuously produce the effect.
The addition amount of the composite bacterial carbon source prepared into the tablet is easy to control, and the bacterial mass reproduction and sludge expansion are not easy to cause; and the dissolution speed is slow (generally 4-8 h), so that the preparation of a solution is not needed, and the labor cost is greatly reduced. The composite strain carbon source is obtained through a series of physical processing such as crushing, liquid-solid separation, extrusion, homogenization, grinding, bacteria preparation, tabletting and the like, and the components of the composite strain carbon source are highly matched with those of the composite carbon source used by a domestic sewage treatment plant, so that the composite strain carbon source can completely replace the composite carbon source of the domestic sewage treatment plant. The carbon source of the composite strain after the flaking and shaping has gram degree identification, the price only accounts for 1/4 of the traditional carbon source, and the composite strain is matched with the environmental protection concept of waste utilization and resource regeneration, and has high economic value. The tablet composite strain carbon source prepared by mixing the organic matter mixture and the biological strain is dissolved in water in the use process, has a certain slow release time, is controllable in metering, and cannot impact water. The composite strain carbon source has the characteristics of safe use, low cost, small addition amount, easy absorption and utilization by microorganisms, reduction of the yield of activated sludge and improvement of the activity of sludge, can be widely applied to sewage treatment systems, and is a sewage treatment product worthy of popularization and application.
In addition, kitchen waste is made into a composite strain carbon source, so that the problems of sewage drip, odor diffusion and the like in the process of centralized transportation of the kitchen waste are reduced; the transportation cost and the manual labor for intensively transporting the kitchen waste are saved; the secondary pollution of kitchen garbage to the ecological environment is reduced. The method for preparing the composite bacterial carbon source accords with the policies of environmental protection and resource recycling.
According to the preparation method, chemical treatment is not needed, and the composite strain carbon source can be prepared by physically treating kitchen waste.
The second aspect of the application provides a composite bacterial carbon source prepared by the preparation method.
In some embodiments, the composite bacterial carbon source comprises a tablet of composite bacterial carbon source.
In some specific embodiments, the thickness of the composite bacterial carbon source of the tablet is 6 mm-8 mm; the diameter is 18 mm-22 mm.
The composite strain carbon source is solid, so that the composite strain carbon source is more convenient to store and manage, transport for long distance and quantitatively calculate during use; the sustained release preparation also has the advantages of good sustained release performance, high cost performance, stable performance and the like. In addition, the preparation raw materials of the composite bacterial carbon source are kitchen waste which is abundant in source, safe and nontoxic, low in preparation cost and free of harm to ecological environment after long-term use.
The third aspect of the application provides a composite bacterial carbon source prepared by the preparation method or application of the composite bacterial carbon source in sewage treatment.
The composite strain carbon source is used for treating sewage, and has the advantages of high efficiency, safety, no toxicity and the like.
The present application will be further described with reference to specific examples and comparative examples, which should not be construed as limiting the scope of the present application. The materials used in the following examples were all commercially available, unless otherwise specified, the equipment used, and the processes involved, unless otherwise specified, were all routinely selected by those skilled in the art.
Example 1:
1. a tablet composite seed carbon source was prepared according to the procedure shown in FIG. 1. The method specifically comprises the following steps:
(1) Crushing: putting kitchen waste into a pulverizer for primary pulverization to obtain pulverized waste with an average particle size of 4 mm.
(2) Solid-liquid separation: removing water and oil in the crushed garbage for the first time, and removing more than 50% of water and oil in the crushed garbage to obtain semi-wet garbage with the water content of 50wt%; simultaneously, the extruded water and oil are discharged to an oil separation tank of a sewage station and finally sent to a sewage treatment station.
(3) Extruding: crushing the semi-wet garbage for the second time and removing water for the second time through extrusion equipment to obtain granular garbage with the average particle size of 2mm and the water content of 3 wt%; and discharging the extruded water and the extruded water into an oil separation tank of the sewage station, and finally conveying the sewage to a sewage treatment station.
(4) Homogenizing: and (3) homogenizing the granular garbage by heating the battery to further remove the water content of the granular garbage to 0.5wt%, and enabling the generated water vapor to enter an exhaust pipeline.
(5) Grinding: grinding the granular garbage in a grinder to obtain powder with fineness of 400 meshes, and obtaining the organic matter mixture.
(6) Preparing bacteria: and (3) adding biological strains into the organic matter mixture at the temperature of 30 ℃, and fully stirring for 15 minutes to obtain the composite strain carbon source powder.
(7) Tabletting: and (3) conveying the composite strain carbon source powder into a tablet machine with the pressure of 600-800 MPa to press the composite strain carbon source powder into round tablets with the diameter of 20mm and the thickness of 7mm, marking the weight, and metering the composite strain carbon source powder conveniently in use.
2. Cost of use for different carbon sources
The volume of a sewage pool is 100m 3 The Chemical Oxygen Demand (COD) of the inlet water is 150mg/L, and the ammonia nitrogen content is 60mg/L. In order to maintain the activity of the flora, glucose or starch nutrient carbon sources are required to be continuously added according to the carbon-nitrogen ratio of sewage.
Flour, wheat flour, soft white sugar and fructose purchase price 5000 yuan per ton, glucose purchase price 4000 yuan per ton. The wastewater tank needs to be added with 25kg of carbon source every day, and the cost is about 100 yuan.
In order to increase and improve the quality of the bacterial colony, 250 g-500 g of bacterial strain is added into each cubic sewage pool. The price of the aerobic bacteria is 4.5 ten thousand yuan/ton, the price of the anaerobic bacteria is 6.5 ten thousand yuan/ton, the strain cost is 30 yuan/day to 50 yuan/day, and the cost of the strain and carbon source which are required to be added every day in the sewage pool is 140 yuan in order to ensure the sewage treatment effect; if the composite bacterial carbon source is adopted as the additional carbon source and bacterial, the cost of the bacterial and the carbon source which are required to be added in the sewage pool every day is about 60 yuan.
The comparison results of the use cost of the composite bacterial carbon source and the use cost of other carbon sources are shown in table 1. The result shows that the composite strain carbon source has the advantages of simple operation, easy storage, low cost and the like.
TABLE 1
3. The results of the comparison with the conventional composite carbon source are shown in Table 2. After the tablet composite bacterial carbon source is put into a sewage tank, the tablet composite bacterial carbon source has the advantages of slow dissolution, long release duration of the carbon source and biological bacterial, promotion of decomposition of organic matters and reduction of environmental burden.
TABLE 2
4. The comparison result of the carbon source of the composite strain prepared from the kitchen waste is shown in table 3. The kitchen waste is sourced from various restaurants and dining halls, and the collection process is long, and usually requires 1-3 days. The main components of the kitchen waste are high grease and high protein, a large amount of thiol, ammonia, hydrogen sulfide, methyl sulfide, trimethylamine, formaldehyde, styrene, butyric acid, phenols and other tens of gas and liquid leakage liquid which are harmful bacteria are easy to generate in the collection process, and if the kitchen waste is used for preparing a sewage treatment carbon source, ammonia removal, deoxidation, harmful bacteria removal and the like are also needed in the preparation process, so that the process is duplicated and the preparation cost is high.
TABLE 3 Table 3
In conclusion, the composite strain carbon source prepared by taking kitchen waste as a raw material has the advantages of stable performance, low cost, easy storage, easy transportation and the like; is suitable for popularization and application in the fields of sewage treatment and the like.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A method for preparing a composite bacterial carbon source by utilizing kitchen waste is characterized by comprising the following steps:
crushing, dewatering and grinding kitchen waste to prepare an organic matter mixture;
and mixing the organic matter mixture with biological strains to obtain a composite strain carbon source.
2. The method of claim 1, wherein the biological species comprises one or more of an aerobic species and an anaerobic species.
3. The method for preparing a composite bacterial carbon source according to any one of claims 1 to 2, wherein the addition amount of the biological bacterial is 3wt% to 5wt% based on the total mass of the organic matter mixture.
4. The method for preparing a composite bacterial carbon source according to any one of claims 1 to 2, wherein the organic matter mixture comprises starch, protein, cellulose, lipid and inorganic salt.
5. The method for preparing a composite bacterial carbon source according to any one of claims 1 to 2, wherein the step of preparing the organic matter mixture comprises:
crushing kitchen waste to obtain crushed waste;
carrying out solid-liquid separation on the crushed garbage to obtain semi-wet garbage;
extruding the semi-wet garbage to obtain granular garbage; and
homogenizing and grinding the granular garbage to obtain an organic matter mixture.
6. The method for preparing a composite bacterial carbon source according to claim 5, wherein the preparation method satisfies at least one of the following conditions (1) to (3):
(1) The water content in the semi-wet garbage is 40-50 wt%;
(2) The water content in the granular garbage is 3-5 wt%; and
(3) The water content of the organic matter mixture is 0.3-0.5 wt%.
7. The method for preparing a composite bacterial carbon source according to claim 5, wherein the preparation method satisfies at least one of the following conditions (1) to (3):
(1) The average particle size of the crushed garbage is 3.1 mm-5 mm;
(2) The average particle size of the granular garbage is 1 mm-3 mm; and
(3) The granularity of the organic matter mixture is 300-400 meshes.
8. The method for preparing a composite bacterial carbon source according to any one of claims 1 to 2 and 6 to 7, further comprising the steps of, after mixing the organic matter mixture with a biological bacterial species and before obtaining the composite bacterial carbon source:
tabletting the mixture of the organic matter mixture and the biological strain mixture to prepare the composite strain carbon source of the tablet.
9. A composite bacterial carbon source, characterized in that the composite bacterial carbon source is prepared by the preparation method of any one of claims 1-8.
10. The application of the composite bacterial carbon source prepared by the method of any one of claims 1-8 in sewage treatment.
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