Method for preparing fuel ethanol from kitchen waste

Abstract

The invention discloses a method for preparing fuel ethanol from kitchen waste. The method includes the steps of (1) subjecting the kitchen waste to solid-liquid separation, and sorting starch waste from the obtained solid-phase kitchen waste; (2) adding water into the starch waste according to a material-water ratio of (2.8-3.4):1, and pulping; (3) heating the pulp at 75-110 DEG C for 30-60 minutes and cooling the pulp to the temperature below 60 DEG C; (4) regulating a pH value of the pulp to 4-5, adding glucoamylase to make the pulp saccharify at 58-60 DEG C for 15-60 minutes, filtering andkeeping filtrate; (5) inoculating the filtrate by composite Saccharomyces cerevisiae and carrying out anaerobic fermentation at 30-37 DEG C for 36-72 hours, wherein the inoculation amount of the composite Saccharomyces cerevisiae is 8-12%wt, and the composite Saccharomyces cerevisiae consists of Saccharomyces cerevisiae RasseII+ Saccharomyces cerevisiae K + Saccharomyces cerevisiae Hakken No.1; (6) sequentially carrying out secondary distillation by a crude distillation tower and a rectifying tower so as to obtain the fuel ethanol. The method for preparing the fuel ethanol from the kitchen waste can turn the starch waste from the kitchen waste into the ethanol efficiently, and the prepared ethanol has high purity.

Description

technical field [0001] The invention belongs to the technical field of kitchen waste resource treatment, and in particular relates to a method for preparing fuel ethanol from kitchen waste. Background technique [0002] Energy is the basic driving force for economic and social development. In the past 50 years, although the application of coal, oil and natural gas has greatly promoted the development of the world economy and the progress of human society, these fossil energy sources are not renewable and cannot achieve sustainable development. Based on the proven reserves and mining speed, the global oil supply can only last for nearly 50 years, natural gas for less than 100 years, and coal for less than 200 years. In other words, the fossil energy resources on the earth will be exhausted in the near future, and global energy security is facing severe challenges. At the same time, the use of fossil energy has an increasingly serious impact on environmental pollution and glo...

AI Technical Summary

Problems solved by technology

[0002] Energy is the basic driving force for economic and social development. In the past 50 years, although the application of coal, oil and natural gas has greatly promoted the development of the world economy and the progress of human society, these fossil energy sources are not renewable and cannot achieve sustainable development. Calculating based on proven reserves and mining speed, the global oil supply can only last for nearly 50 years, natural gas for less than 100 years, and coal for less than 200 years

The production of fuel ethanol as one of the specific applications of energy treatment has rapidly emerged in recent years. However, due to the high moisture content of kitchen waste, the fermentation and distillation processes of ethanol are not perfect, resulting in low resource utilization. , high investment costs, etc.

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