A Green, Low-Carbon Resource and Energy Coupling Method for Brewing Waste

Abstract

The present invention provides a method for coupling green low-carbon resource utilization and energy utilization of brewing waste, belonging to the technical field of resource utilization. The method includes the following steps: (1) coarse screening; (2) thermal drying; (3) fine screening; (4) pyrolysis carbonization; (5) energy conversion; (6) tail gas treatment; (7) liquid-phase product. In view of the problems in the treatment, disposal and resource utilization process of brewing waste, such as how to avoid the direct discharge of excessive brewing waste into the environment and cause harm to the environment, how to dispose of a large amount of brewing waste, and how to turn waste into treasure and carry out resource utilization of brewing waste, the present invention adopts pyrolysis carbonization technology to couple with the green brewing process and proposes a technology for coupling green low-carbon resource utilization and energy utilization of brewing waste.

Description

Technical Field

[0001] The present invention relates to the technical field of resource utilization, and particularly relates to a method for coupling green low-carbon resource utilization and energy utilization of brewing waste. Background Art

[0002] Brewing waste is rich in nutrients, including: fiber, starch, protein, fat, amino acids, and various vitamins, trace elements, enzymes and other active substances. At the same time, there are also relevant strains remaining in the brewing waste, and the microbial content is rich. If not treated in time, it is easy to deteriorate, not only causing waste of resources, but also polluting the environment. How to quickly dispose of the huge amount of brewing waste is an urgent problem in the field of resource utilization of brewing waste.

[0003] Common methods for resource utilization of brewing waste include: producing feed, but the nutritional value and fertilizer efficiency are relatively low; making condiments, but the safety is still in question; extracting functional substances, but limited by the complex composition and high cost; using as energy, but the energy efficiency is low and there is a problem of secondary pollution.

[0004] Pyrolysis carbonization technology refers to the formation of high-carbon compounds from biomass materials under low-oxygen or oxygen-free conditions at high or low temperatures for a certain period of time. Since pyrolysis carbonization technology can reduce the volume of brewing waste, kill relevant pathogenic microorganisms, and form high-carbon compounds with porosity, high specific surface area, containing mineral elements, hydroxyl or carboxyl functional groups. The present invention makes full use of the advantages of pyrolysis carbonization technology. The biochar prepared by pyrolysis carbonization of brewing waste can be used for land use, which becomes an effective method for quickly disposing of the huge amount of brewing waste, and there is no relevant technical report in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to propose a method for coupling green low-carbon resource utilization and energy utilization of brewing waste. In view of the problems in the treatment and disposal and resource utilization process of brewing waste, it focuses on solving problems such as how to avoid the direct discharge of excessive brewing waste into the environment and cause harm to the environment; how to dispose of the huge amount of brewing waste; how to turn waste into treasure and carry out resource utilization of brewing waste, etc. By coupling pyrolysis carbonization technology with green brewing technology, a coupling technology for green low-carbon resource utilization and energy utilization of brewing waste is proposed.

[0006] The technical solution of the present invention is realized as follows:

[0007] The present invention provides a method for coupling green low-carbon resource utilization and energy utilization of brewing waste, comprising the following steps:

[0008] (1) Coarse screening: Screening the brewing waste generated by the brewing process through a sieve with a mesh size of 6-7 mm. The brewing waste in the undersize part is subjected to thermal drying, and the inorganic impurities in the oversize part, such as pit mud, are treated as waste.

[0009] (2) Thermal drying: The brewing waste in the undersize fraction from step (1) is dried by thermal drying, and the moisture content of the dried brewing waste is reduced to below 30%;

[0010] (3) Fine screening: The brewing waste obtained by thermal drying in step (2) is screened through a 4 - 5 mm sieve. The brewing waste in the oversize fraction is subjected to pyrolysis carbonization treatment, and the brewing waste in the undersize fraction is used as a feed additive for ecological breeding;

[0011] (4) Pyrolysis carbonization: The brewing waste after fine screening is conveyed to a pyrolysis device for pyrolysis to prepare biochar from the brewing waste;

[0012] (5) Energy conversion: The pyrolysis gas generated during the pyrolysis carbonization process is converted into hot water through energy conversion, and the heat energy is transferred to the thermal drying process to achieve energy recovery and utilization. At the same time, the remaining heat energy is used for steam generation;

[0013] (6) Tail gas treatment: The odorous gas generated during the pyrolysis of the brewing waste and the tail gas generated during the energy utilization of the pyrolysis gas are collected and treated, and the tail gas emissions meet the relevant national emission standards;

[0014] (7) Liquid phase product: The liquid phase product generated during the pyrolysis of the brewing waste is collected through a pipeline and processed to prepare high - value added products.

[0015] As a further improvement of the present invention, the brewing waste includes but is not limited to: one or several kinds of brewing residues of sorghum, wheat, rice, and sweet potato.

[0016] As a further improvement of the present invention, during the drying process in step (2), the temperature of the brewing waste is between 60 - 100 °C.

[0017] As a further improvement of the present invention, in step (4), the temperature of the pyrolysis is 400 - 800 °C, the heating rate is 10 - 100 °C / min, and the residence time of the brewing waste in the device is 20 - 120 min.

[0018] As a further improvement of the present invention, in step (4), gas is generated by a continuous pyrolysis device, and a low - oxygen or oxygen - free environment is achieved inside the device, or protective gases such as nitrogen, argon, carbon dioxide, and water vapor are introduced.

[0019] As a further improvement of the present invention, the bio - product in step (4) is used as a carbon - based fertilizer, soil improvement material, sewage treatment material, or sludge treatment material.

[0020] As a further improvement of the present invention, the carbon - based fertilizer is used for green planting, and the harvested crops are used as brewing raw materials.

[0021] As a further improvement of the present invention, the brewing raw materials include but are not limited to: sorghum, wheat, rice, sweet potato, one or several of them.

[0022] As a further improvement of the present invention, in step (6), the collection method is pipeline closed collection or negative pressure hood collection; the treatment method is to carry out desulfurization and denitrification treatment through at least one of the processes of catalytic oxidation / catalytic reduction, scrubbing absorption, biological filtration, and activated carbon filtration.

[0023] As a further improvement of the present invention, in step (7), the treatment method is separation and / or purification technology.

[0024] By combining the brewing process, pyrolysis carbonization process, and green planting technology of carbon-based fertilizers, using the pyrolysis carbonization process, the brewing waste generated at the brewing process end is transformed into brewing waste biochar; the brewing waste biochar is used as a green carbon-based fertilizer for green planting to increase soil organic carbon and crop yield; after crop harvesting, it is re-used as a brewing raw material and put into the brewing process.

[0025] Preferably, the preparation method of the green carbon-based fertilizer is as follows:

[0026] S1. Add the brewing waste biochar into ethanol, add KH560, heat and stir to react, filter, wash, and dry to obtain modified brewing waste biochar;

[0027] S2. Dissolve chitosan in an acid solution, add the modified brewing waste biochar, and stir to react to obtain porous network brewing waste biochar;

[0028] S3. Add the porous network brewing waste biochar into a nutrient solution, evaporate the solvent to dryness to obtain nutrient-rich biochar;

[0029] S4. Add the nutrient-rich biochar into a bacterial solution, and freeze-dry to obtain the green carbon-based fertilizer.

[0030] Preferably, in step S1, the mass ratio of the brewing waste biochar to KH560 is 10:1 - 2, the temperature of the heating and stirring reaction is 40 - 50 °C, and the time is 1 - 2 h.

[0031] Preferably, in step S2, the mass ratio of chitosan to the modified brewing waste biochar is 5 - 7:10, and the stirring reaction time is 12 - 14 h.

[0032] Preferably, the preparation method of the green carbon-based fertilizer is as follows:

[0033] T1. Add brewer's waste biochar to water, add tannic acid, humic acid and a catalyst, heat and stir for reaction, filter, wash and dry to obtain modified brewer's waste biochar;

[0034] T2. Add the modified brewer's waste biochar to water, add NHS (N-hydroxysuccinimide) and EDC (1-ethyl-(3-dimethylaminopropyl)carbodiimide), conduct an activation reaction, add silk fibroin peptide, and stir for reaction to obtain porous networked brewer's waste biochar;

[0035] T3. Add the porous networked brewer's waste biochar to a nutrient solution, evaporate the solvent to dryness to obtain nutrient-rich biochar;

[0036] T4. Add the nutrient-rich biochar to a bacterial solution, and freeze-dry to obtain a green carbon-based fertilizer.

[0037] Preferably, the mass ratio of the brewer's waste biochar, tannic acid, humic acid and the catalyst in step T1 is 10:2-3:1-1.5:0.5-1, the catalyst is a Tris-HCl solution with a pH of 8.5-9.5, the temperature of the heating and stirring reaction is 40-50 °C, and the time is 2-4 h.

[0038] Preferably, the mass ratio of the modified brewer's waste biochar, NHS, EDC and silk fibroin peptide in step T2 is 10:4-7:3-5:3-5, the temperature of the activation reaction is 0-4 °C, the time is 30-40 min, and the time of the stirring reaction is 10-14 h.

[0039] Preferably, the preparation method of the nutrient solution is as follows: Add a carbon source, a nitrogen source, vitamins, amino acids, and trace minerals to water, stir and mix evenly to obtain a nutrient solution. The mass ratio of the carbon source, nitrogen source, vitamins, amino acids, trace minerals and water is 10-12:8-10:2-3:1-2:2-3:500; the carbon source is selected from at least one of glucose, fructose, sucrose, and lactose; the nitrogen source is selected from at least one of peptone, beef extract, yeast extract, silkworm chrysalis powder, fish bone meal, and urea; the vitamins are selected from at least one of vitamin B12, vitamin B2, vitamin A, folic acid, niacin, vitamin C, vitamin E, and vitamin D3; the amino acids are selected from at least one of valine, lysine, isoleucine, phenylalanine, leucine, tryptophan, threonine, alanine, and phenylalanine; the trace minerals are selected from at least one of magnesium sulfate, potassium sulfate, sodium nitrate, ammonium chloride, and potassium phosphate.

[0040] Preferably, the bacterial solution is a suspension of Bacillus subtilis and Bacillus licheniformis, and the bacterial content is 10 10 -10 11cfu / mL, and the mass ratio of the Bacillus subtilis to the Bacillus licheniformis is 5-7:2-4.

[0041] "Brewing raw materials - brewing waste - brewing waste biochar - brewing food crops - brewing raw materials". During the entire circular process, the brewing waste has changed from the original huge and difficult-to-dispose waste to an intermediate product for resource-based recycling, realizing the green, low-carbon resource utilization and energy utilization of brewing waste.

[0042] The present invention has the following beneficial effects:

[0043] 1. The brewing waste biochar has a large specific surface area, a developed pore structure, retains the characteristics of plant vascular tissues, etc., has a high carbon content, and also contains certain mineral nutrient elements such as potassium, phosphorus, and magnesium required by plants. The brewing waste biochar is used as a material for green planting and soil improvement, which can adjust the soil acidity and alkalinity, improve the physical structure of the soil, increase the organic carbon content of different types of soil, improve the nitrogen absorption capacity, promote the growth of plant roots, and increase the crop yield. The brewing waste biochar is used as a material for sewage treatment and sludge treatment, playing the roles of a framework material, an electron transfer medium, and adsorption.

[0044] 2. For the brewing waste biochar, the pyrolysis gas generated during the pyrolysis carbonization process is used to heat hot water by combustion, and the heat energy is recycled to the thermal drying process, saving energy use, reducing energy consumption, and further realizing the energy utilization of brewing waste.

[0045] 3. Through the pyrolysis carbonization technology, during the entire process cycle of "brewing raw materials - brewing waste - brewing waste biochar - brewing food crops - brewing raw materials", the brewing waste has changed from the original waste to an intermediate product, truly realizing the resource utilization and energy utilization of brewing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0047] Figure 1 is the process flow chart of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] Example 1

[0050] A winery screens the brewing waste generated during brewing through a 7-mm sieve. The screened brewing waste is conveyed to a thermal dryer through a conveyor belt, with a drying temperature of 55 - 95°C and dried to a moisture content of 20%. It is then screened through a 5-mm sieve. The brewing waste less than 5 mm is used as a feed additive and transported to a certain farm to feed poultry. The slaughter time of the poultry is reduced by 5 days, and the protein content of the poultry and eggs is increased by more than 5‰. The brewing waste greater than or equal to 5 mm is conveyed to a continuous pyrolysis device for pyrolysis at a pyrolysis temperature of 600°C to prepare biochar from brewing waste.

[0051] The generated pyrolysis gas is efficiently combusted to produce heat in a flameless combustion manner. The heat generated by the pyrolysis gas is reused in the low-temperature sludge drying process through steam generation or hot water. The liquid-phase products are centrally collected, separated and purified to prepare high-value additives, saturated hydrocarbons.

[0052] The biochar from brewing waste is used for green planting, with a total application rate of 15 t / ha. Sorghum, a food crop, is planted. After the sorghum matures, the yield per mu is increased by 5%, and the soil organic matter is increased by 1%. After the sorghum is harvested and processed, it is transported to the winery and used as a brewing raw material for green brewing. During the process of green planting with the biochar from brewing waste, the soil organic matter is increased, improving the soil.

[0053] Example 2

[0054] A winery screens the brewing waste generated during brewing through a 7-mm sieve. The screened brewing waste is conveyed to a thermal dryer through a conveyor belt, with a drying temperature of 60 - 100°C and dried to a moisture content of 15%. It is then screened through a 5-mm sieve. The brewing waste less than 5 mm is used as a feed additive and transported to a certain farm to feed poultry. The slaughter time of the poultry is reduced by 4 days, and the prevalence rate is reduced by 2%. The protein content of the poultry and eggs is increased by more than 4‰. The brewing waste greater than or equal to 5 mm is conveyed to a continuous pyrolysis device for pyrolysis at a pyrolysis temperature of 650°C to prepare biochar from brewing waste.

[0055] The generated pyrolysis gas is efficiently combusted to produce heat in a flameless combustion manner. The heat generated by the pyrolysis gas is reused in the low-temperature sludge drying process through steam generation or hot water, saving energy. The liquid-phase products are centrally collected, separated and purified to prepare high-value additives, fatty alcohols and mercaptans.

[0056] Brewery waste biochar, used for green planting, with a total application rate of 20 t / ha. When planting the food crop wheat, after the wheat matured, the yield per mu increased by 4%, and the soil organic matter increased by 2%. After the wheat was harvested and processed, it was transported to the brewery as a brewing raw material for green brewing. At the same time, brewery waste biochar can be used as a sewage treatment material. For example: into a 10 m 3 sewage tank, 4.5 kg of brewery waste biochar was added. The initial concentration of tetracycline was 40 mg / L. After being treated by the cyclic adsorption of brewery waste biochar, the removal rate of tetracycline reached over 85%.

[0057] Example 3

[0058] A certain brewery screened the brewery waste generated during brewing through a 7-mm sieve. The screened brewery waste was transported to a thermal dryer through a conveyor belt. The drying temperature was 50 - 80 °C, and it was dried to a moisture content of 18%. It was screened through a 5-mm sieve. The brewery waste less than 5 mm was transported to a certain farm to feed poultry. The slaughter time of the poultry was reduced by 2 days, the prevalence rate was reduced by 2%, and the protein content of the poultry and eggs increased by more than 6‰. The brewery waste greater than or equal to 5 mm was transported to a continuous pyrolysis device for pyrolysis. The pyrolysis temperature was 600 °C to prepare brewery waste biochar.

[0059] The pyrolysis gas generated was efficiently combusted to produce heat in a flameless combustion manner. The heat generated by the pyrolysis gas was reused in the low-temperature sludge drying process through steam generation or hot water, saving energy use; the liquid-phase products were centrally collected, separated and purified to prepare high-value additives, linear olefins.

[0060] The brewery waste biochar was mixed evenly with agricultural chemical fertilizers. The mass ratio of the added chemical fertilizers was 10%. It was broadcast and applied at a rate of 10 t / ha. When planting the food crop sorghum, after the sorghum matured, the yield per mu increased by 8%, and the soil organic matter increased by 2%. After the sorghum was harvested and processed, it was transported to the brewery as a brewing raw material for green brewing. At the same time, brewery waste biochar can be used as a sludge treatment material and used as a sludge dewatering framework material. The sludge specific resistance was reduced by 40%, and the dewatering efficiency of the filter press was increased by 20%.

[0061] The present invention utilizes brewing waste. Coarse screening is carried out, and inorganic impurities in the pit mud with a size greater than or equal to 6 - 7 mm are treated as waste, while brewing waste with a size less than 6 - 7 mm is thermally dried. After thermal drying, fine screening is carried out. Brewing waste with a size greater than or equal to 4 - 5 mm is subjected to pyrolytic carbonization treatment, and brewing waste with a size less than 4 - 5 mm is used as a feed additive for ecological breeding. The biochar of brewing waste prepared by pyrolytic carbonization is used for green planting to produce brewing raw materials, and at the same time, it can also be used as a soil improvement material, a sewage treatment material, and a sludge treatment material. The pyrolysis gas generated by pyrolytic carbonization is used to recycle the heat energy to the thermal drying link through the way of generating hot water and steam, saving energy. The liquid phase products generated by pyrolytic carbonization are prepared into high-value added products through separation and purification technology. In the whole brewing process cycle, the present invention transforms brewing waste from the initially difficult-to-dispose waste into intermediate products, realizing the resource utilization and energy utilization of brewing waste.

[0062] Example 4 Preparation of Green Carbon-based Fertilizer

[0063] The method is as follows:

[0064] S1. Add 10 g of the biochar of brewing waste prepared in Example 1 to 200 mL of ethanol, add 1.5 g of silane coupling agent KH560, heat to 45 °C, stir and react for 2 h, filter, wash, and dry to obtain modified biochar of brewing waste;

[0065] S2. Dissolve 6 g of chitosan in 500 mL of 2 wt% acetic acid solution, add 10 g of modified biochar of brewing waste, stir and react for 13 h, filter, wash, and dry to obtain porous network biochar of brewing waste;

[0066] S3. Add 10 g of porous network biochar of brewing waste to 100 mL of nutrient solution, evaporate the solvent to dryness to obtain nutrient-rich biochar;

[0067] The preparation method of the nutrient solution is as follows: Add 11 g of glucose, 9 g of urea, 2 g of vitamin C, 0.5 g of threonine, 0.5 g of alanine, 0.5 g of magnesium sulfate, 0.5 g of potassium sulfate, 0.5 g of sodium nitrate, 0.5 g of ammonium chloride, and 0.5 g of potassium phosphate to 500 mL of water, stir and mix evenly to obtain the nutrient solution;

[0068] S4. Add 10 g of nutrient-rich biochar to 100 mL of bacterial solution, and freeze-dry to obtain green carbon-based fertilizer;

[0069] The bacterial solution is a suspension of Bacillus subtilis and Bacillus licheniformis, with a bacterial content of 10 10 -10 11 cfu / mL, and the mass ratio of Bacillus subtilis to Bacillus licheniformis is 6:3.

[0070] Example 5 Preparation of Green Carbon-based Fertilizer

[0071] The method is as follows:

[0072] T1. Add 10 g of the brewer's waste biochar prepared in Example 1 to 200 mL of water, add 2.5 g of tannic acid, 1.2 g of humic acid and 1 g of catalyst, heat to 45 °C, stir and react for 3 h, filter, wash, and dry to obtain modified brewer's waste biochar;

[0073] The catalyst is a Tris-HCl solution with pH = 9;

[0074] T2. Add 10 g of the modified brewer's waste biochar to 500 mL of water, add 5.5 g of NHS and 4 g of EDC, activate and react at 4 °C for 30 min, add 4 g of silk fibroin peptide, and stir and react for 12 h to obtain porous reticular brewer's waste biochar;

[0075] T3. Add 10 g of the porous reticular brewer's waste biochar to 100 mL of nutrient solution, evaporate the solvent to dryness to obtain nutrient-rich biochar;

[0076] The preparation method of the nutrient solution is as follows: Add 11 g of glucose, 9 g of urea, 2 g of vitamin C, 0.5 g of threonine, 0.5 g of alanine, 0.5 g of magnesium sulfate, 0.5 g of potassium sulfate, 0.5 g of sodium nitrate, 0.5 g of ammonium chloride, and 0.5 g of potassium phosphate to 500 mL of water, stir and mix evenly to obtain the nutrient solution;

[0077] T4. Add 10 g of the nutrient-rich biochar to 100 mL of bacterial solution, and freeze-dry to obtain the green carbon-based fertilizer;

[0078] The bacterial solution is a suspension of Bacillus subtilis and Bacillus licheniformis, with a bacterial content of 10 10 -10 11 cfu / mL, and the mass ratio of Bacillus subtilis to Bacillus licheniformis is 6:3.

[0079] Comparative Example 1

[0080] Compared with Example 4, the difference is that step S1 is not carried out.

[0081] The method is as follows:

[0082] S1. Dissolve 6 g of chitosan in 500 mL of 2 wt% acetic acid solution, add 10 g of the brewer's waste biochar prepared in Example 1, stir and react for 13 h, filter, wash, and dry to obtain modified brewer's waste biochar;

[0083] S2. Add 10 g of modified brewer's waste biochar to 100 mL of nutrient solution, evaporate the solvent to dryness, and obtain nutrient-rich biochar;

[0084] The preparation method of the nutrient solution is as follows: Add 11 g of glucose, 9 g of urea, 2 g of vitamin C, 0.5 g of threonine, 0.5 g of alanine, 0.5 g of magnesium sulfate, 0.5 g of potassium sulfate, 0.5 g of sodium nitrate, 0.5 g of ammonium chloride, and 0.5 g of potassium phosphate to 500 mL of water, stir and mix evenly to obtain the nutrient solution;

[0085] S3. Add 10 g of nutrient-rich biochar to 100 mL of bacterial solution, and freeze-dry to obtain green carbon-based fertilizer;

[0086] The bacterial solution is a suspension of Bacillus subtilis and Bacillus licheniformis, with a bacterial content of 10 10 -10 11 cfu / mL, and the mass ratio of Bacillus subtilis to Bacillus licheniformis is 6:3.

[0087] Comparative Example 2

[0088] Compared with Example 5, the difference is that step T1 is not carried out.

[0089] The method is as follows:

[0090] T1. Add 10 g of the brewer's waste biochar prepared in Example 1 to 500 mL of water, add 5.5 g of NHS and 4 g of EDC, activate and react at 4 °C for 30 min, add 4 g of silk fibroin peptide, and stir and react for 12 h to obtain modified brewer's waste biochar;

[0091] T2. Add 10 g of modified brewer's waste biochar to 100 mL of nutrient solution, evaporate the solvent to dryness, and obtain nutrient-rich biochar;

[0092] The preparation method of the nutrient solution is as follows: Add 11 g of glucose, 9 g of urea, 2 g of vitamin C, 0.5 g of threonine, 0.5 g of alanine, 0.5 g of magnesium sulfate, 0.5 g of potassium sulfate, 0.5 g of sodium nitrate, 0.5 g of ammonium chloride, and 0.5 g of potassium phosphate to 500 mL of water, stir and mix evenly to obtain the nutrient solution;

[0093] T3. Add 10 g of nutrient-rich biochar to 100 mL of bacterial solution, and freeze-dry to obtain green carbon-based fertilizer;

[0094] The bacterial solution is a suspension of Bacillus subtilis and Bacillus licheniformis, with a bacterial content of 10 10 -10 11 cfu / mL, and the mass ratio of Bacillus subtilis to Bacillus licheniformis is 6:3.

[0095] Comparative Example 3

[0096] Compared with Example 5, the difference lies in that steps T1 and T2 are not carried out.

[0097] The method is as follows:

[0098] T1. Add 10 g of the biochar of brewing waste obtained in Example 1 to 100 mL of nutrient solution, evaporate the solvent to dryness to obtain nutrient-rich biochar;

[0099] The preparation method of the nutrient solution is as follows: Add 11 g of glucose, 9 g of urea, 2 g of vitamin C, 0.5 g of threonine, 0.5 g of alanine, 0.5 g of magnesium sulfate, 0.5 g of potassium sulfate, 0.5 g of sodium nitrate, 0.5 g of ammonium chloride, and 0.5 g of potassium phosphate to 500 mL of water, stir and mix evenly to obtain the nutrient solution;

[0100] T2. Add 10 g of the nutrient-rich biochar to 100 mL of bacterial solution, and freeze-dry to obtain a green carbon-based fertilizer;

[0101] The bacterial solution is a suspension of Bacillus subtilis and Bacillus licheniformis, with a bacterial content of 10 10 -10 11 cfu / mL, and the mass ratio of Bacillus subtilis to Bacillus licheniformis is 6:3.

[0102] Comparative Example 4

[0103] The green carbon-based fertilizer is the biochar of brewing waste obtained in Example 1.

[0104] Test Example 1

[0105] Test materials: The test soil was collected from a low-fertility sandy land plot in Hanjiazhuang, Sizhilan Town, Ningjin County, Hebei Province. Before the test, the soil sample was air-dried, passed through a 50-mesh sieve, and plant roots and small stones and other sundries were removed.

[0106] Test objects: The green carbon-based fertilizers prepared in Examples 4-5 and Comparative Examples 1-4.

[0107] Test method: Each pot of sandy soil weighs 1500 g, 50 g of green carbon-based fertilizer is mixed into each pot, and an equal amount of sandy soil is mixed into the blank group. After mixing evenly, add 500 mL of water, treat at room temperature for 7 d, and measure various indexes. The results are shown in Table 1.

[0108] Table 1

[0109]

[0110]

[0111] As can be seen from the above table, the green carbon-based fertilizer prepared in Examples 4-5 of the present invention has the effect of regulating low-fertility soil, can significantly improve soil fertility, increase the total water-stable aggregates, increase the contents of organic matter, N, P, and soil bacteria, reduce the heavy metal content in the soil, and adjust the soil pH value.

[0112] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for coupling the resource utilization and energy utilization of brewing waste, characterized in that, It includes the following steps: (1) Coarse screening: Screening the brewing waste generated from the brewing process through a sieve with a size of 6 - 7 mm. The brewing waste in the undersize part is subjected to thermal drying, and the inorganic impurities in the oversize part of the pit mud are treated as waste; (2) Thermal drying: The brewing waste in the undersize part in step (1) is dried by thermal drying, and the moisture content of the thermally dried brewing waste is reduced to less than 30%; (3) Fine screening: The brewing waste obtained by thermal drying in step (2) is screened through a sieve with a size of 4 - 5 mm. The brewing waste in the oversize part is subjected to pyrolysis carbonization treatment, and the brewing waste in the undersize part is used as a feed additive for ecological breeding; (4) Pyrolysis carbonization: The brewing waste after fine screening is transported to a pyrolysis device for pyrolysis to prepare biochar from brewing waste. The biochar from brewing waste is used as a green carbon-based fertilizer for green planting to increase soil organic carbon and crop yield. After the crops are harvested, they are re-used as brewing raw materials and put into the brewing process; The preparation method of the green carbon-based fertilizer is as follows: T1. Add biochar from brewing waste into water, add tannic acid, humic acid and a catalyst, heat and stir for reaction, filter, wash and dry to obtain modified biochar from brewing waste; T2. Add the modified biochar from brewing waste into water, add N-hydroxysuccinimide and 1-ethyl-(3-dimethylaminopropyl)carbodiimide, carry out an activation reaction, add silk fibroin peptide, and stir for reaction to obtain porous network biochar from brewing waste; T3. Add the porous network biochar from brewing waste into a nutrient solution, evaporate the solvent to obtain nutrient-rich biochar; T4. Add the nutrient-rich biochar into a bacterial solution, and freeze-dry to obtain the green carbon-based fertilizer; (5) Energy conversion: The pyrolysis gas generated during the pyrolysis carbonization process is converted into hot water through energy conversion, and the heat energy is transferred to the thermal drying process to achieve energy recovery and utilization. At the same time, the remaining heat energy is used for steam generation; (6) Tail gas treatment: The odors generated during the pyrolysis of brewing waste and the tail gases generated during the energy utilization of pyrolysis gas are collected and treated, and the tail gas emissions meet the relevant national emission standards; (7) Liquid-phase products: The liquid-phase products generated during the pyrolysis of brewing waste are collected through pipelines and processed to prepare high-value added products.

2. The method according to claim 1, wherein The brewing waste is selected from one or more of sorghum, wheat, rice, and sweet potato brewing residues.

3. The method according to claim 1, wherein During the drying process in step (2), the temperature of the brewing waste is between 60 - 100 °C.

4. The method according to claim 1, wherein In step (4), the temperature of the pyrolysis is 400 - 800 °C, the heating rate is 10 - 100 °C / min, and the residence time of the brewing waste in the device is 20 - 120 min.

5. The method according to claim 1, characterized in that, In step (4), gas is generated through a continuous pyrolysis device, and a low-oxygen or oxygen-free environment is achieved inside the device, or a protective gas such as nitrogen, argon, carbon dioxide, or water vapor is introduced.

6. The method according to claim 1, wherein The brewing raw materials are selected from one or more of sorghum, wheat, rice, and sweet potato.

7. The method according to claim 1, characterized in that The collection method described in step (6) is closed pipeline collection or negative pressure hood collection; the treatment method is desulfurization and denitrification treatment by at least one of the processes of catalytic oxidation / catalytic reduction, washing absorption, biological filtration, and activated carbon filtration.

8. The method according to claim 1, wherein The treatment method described in step (7) is separation and / or purification technology.

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