A resource-based, harmless and reduced-volume kitchen waste treatment process

Abstract

The invention relates to the field of kitchen waste treatment, and particularly discloses a kitchen waste treatment process with reclamation, harmlessness and reduction. In the aspect of reclamation, the composition of nutrient ingredients of kitchen waste is fully taken into account, and main ingredients such as starch, free sugar, oil and fat, proteins, cellulose and inorganic salt are collected in classification and converted as much as possible; in the aspect of harmlessness, pollution and hazards possibly caused by kitchen waste are fully taken into account for a plurality of technical improvements; in the aspect of reduction, firstly, no water is added in the pretreatment stage, then various products and byproducts such as carbon dioxide, oil and fat, ethyl alcohol, vinasse and vinasse waste fluid are gradually separated in the technical process so as to fulfill the purpose of full reduction, and remaining water is recycled after evaporation purification, so that the reduction effect is obvious. The kitchen waste treatment process disclosed by the invention has environment-friendly and low-carbon effects.

Description

technical field [0001] The invention relates to the field of kitchen waste treatment, and more specifically, relates to a resource-based, harmless, and volume-reduced kitchen waste treatment process. Background technique [0002] Kitchen waste refers to the leftovers left over by people in dining places such as restaurants, restaurants, restaurants, unit collective canteens, and school canteens. It is a huge amount and occupies a very large proportion of urban domestic waste. According to incomplete statistics, the national annual output of kitchen waste exceeds 60 million tons. Kitchen waste is rich in nutrients, mainly including starch, free sugar, protein, fat, cellulose, inorganic salts, etc., so it is very easy to spoil, emit foul smell, spread bacteria and viruses, and cause serious environmental pollution. Due to its high water content, it is not suitable for incineration to generate electricity, but it is mostly used to make biogas and compost, etc., but the convers...

AI Technical Summary

Problems solved by technology

[0004]① Low degree of recycling: kitchen waste can be said to be full of treasures, including starch, free sugar, fat, protein, cellulose, inorganic salts, etc. They are all useful nutrients, but the current conventional processing methods have not fully utilized these useful ingredients

For example, Qunhui et al. (a method for producing fuel ethanol by fermentation of food waste ZL 200610114006.7), Qiao Changsheng et al. Method for producing ethanol by fermenting kitchen waste 201210311827.5), Jiao Yan et al. (201210393707.4), the technology developed by Jiao Yan et al. et al. (A method for producing fuel ethanol from food waste 201110207485.8), Shi Dayong (A method for synchronously saccharifying and fermenting food waste to produce ethanol using Zymomonas mobilis 201210311827.5) did not even take into The protein, cellulose, inorganic salts and bacterial cells produced by fermentation are used as resources and processed into distiller's grains feed; while Zhang Jinghui et al. Method for Comprehensive Utilization of Food Waste 201110134297.7) Although both oil and distiller's grains are recycled into feed, it is still negligent. Like all the above-mentioned processes, it does not recover the carbon dioxide produced in the fermentation process.

Carbon dioxide is one of the largest by-products in the fermentation industry. Its output is almost equal to that of ethanol, and it has a wide range of uses in industry as protective gas and fire extinguishing equipment. Therefore, it is easy to discharge without recycling, which is a resource. The loss will cause secondary pollution to the environment

[0005]②Low oil recovery efficiency: At present, the conventional method of recovering oil from kitchen waste is to directly dehydrate the material after impurity removal, and then adopt the method of oil-water separation Recover oil from it, such as Zhang Jinghui et al. (A method for full biomass resource utilization of kitchen waste 201110435696.7), Xi Limin et al. (A method for comprehensive utilization of kitchen waste 201110134297.7). There are a lot of fat in solid state (such as fat meat, etc.) and many greases adsorbed on the surface of solid residues in kitchen waste. These greases cannot be removed by simple dehydration, and the residues in distiller's grains will eventually be processed into feed, which is easy to further rancidity of feed

[0006]③The strains are outdated: the strains used in the current process of using kitchen waste to ferment ethanol are all traditional wild-type strains, usually unable to independently secrete amylase, Glucoamylase and protease cannot directly degrade and utilize nutrients such as starch, oligosaccharides and protein in kitchen waste

This process has various advantages such as simple operation, low cost, thorough saccharification, and simple regulation. It is an ideal ethanol fermentation process. The processing aspect has not been effectively applied

[0008]⑤ Incomplete harmlessness: the current process of using kitchen waste to prepare ethanol and feed is not thoughtful enough in terms of harmlessness

[0010] From the above situation, it can be seen that the current technology of using kitchen waste to produce ethanol still has many imperfections, and it is impossible to truly realize the harmless production of kitchen waste. Recycling, Recycling, and Reduction

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