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Method adopting hydro-thermal treatment to facilitate producing ethyl alcohol and lactic acid through kitchen waste

A technology for kitchen waste and hydrothermal treatment, which is applied in the directions of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of complex composition of biological bacteria liquid and mixed enzyme preparations, difficult to obtain bacteria species, and complicated configuration methods. , to achieve the effect of good application value, low production cost and high utilization rate of raw materials

Active Publication Date: 2014-01-01
SOUTH CHINA AGRI UNIV
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Problems solved by technology

Invention patent "A method for producing ethanol by using food waste" (CN102321722 A) uses biological bacteria liquid and mixed enzyme preparation to ferment food waste to produce ethanol, but the composition of biological bacteria liquid and mixed enzyme preparation is complicated, and the bacteria are not easy to obtain , the configuration method is relatively cumbersome, and there are certain difficulties in practical applications

Method used

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  • Method adopting hydro-thermal treatment to facilitate producing ethyl alcohol and lactic acid through kitchen waste

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Embodiment 1

[0037] 1. Preliminarily sort the collected food waste, remove the debris that is not easy to ferment, put it into the hydrothermal reactor hydrothermal chamber, add 2 times the volume of water, and conduct hydrothermal treatment at 130°C for 60 minutes; turn on the motor and stir for 10 minutes closure.

[0038] 2. After the hydrothermal treatment is completed, the kitchen waste is sprayed to the three-phase separator, and after standing still, the grease and water-containing solid kitchen waste are separated.

[0039]3. Send the separated water-containing solid food waste to the fermenter, add the stored three-phase separated food waste water to make the solid-liquid volume ratio 1:10, and then add 20% of the weight of the solid food waste mixed bacteria Groups were fermented at 35°C for 96 hours. The ratio of each strain in the mixed flora is Pichia pastoris: Zymomonas mobilis: Aspergillus niger: Rhizopus tokyo: Saccharomyces cerevisiae: Trichoderma reesei=1:1:1:1:1:1. Aft...

Embodiment 2

[0043] The main steps of this embodiment are the same as in Example 1, except that in step 1, when the food waste contains a lot of water, after removing the impurities that are not easy to ferment, it is directly hydrothermally treated at 200°C for 10 minutes, and the stirring motor is not turned on at the same time. After the hydrothermal treatment, the pressure is released. When the pressure of the hydrothermal reactor is released to 1.5atm, the kitchen waste is sprayed into the three-phase separator, and after standing still, the oil and the water exceeding the range of solid-liquid ratio required for ethanol fermentation are separated. , so that the solid-liquid ratio reaches 1:15. The remaining solids and water were sent to the fermenter, and 40% of the solid weight of the mixed flora was added to ferment at 42°C for 120 hours.

Embodiment 3

[0045] The main steps of this embodiment are the same as in Example 1, the difference is that in step 1, 10 times the volume of solid food waste is added; in step 3, water is no longer added, and 40% of the solid weight of the mixed flora is directly added, 38 220 hours of fermentation at ℃. Among them, the ratio of each strain in the mixed flora is Pichia pastoris: Zymomonas mobilis: Aspergillus niger: Rhizopus Tokyo: Saccharomyces cerevisiae: Trichoderma reesei=3:6:4:3:6:6 .

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Abstract

The invention discloses a method adopting hydro-thermal treatment to facilitate producing ethyl alcohol and lactic acid through kitchen waste. The kitchen waste is used as raw materials for producing energy sources and chemical products, so that waste is fully utilized while energy-from-waste and recycling utilization of biomass is realized. According to the method, the kitchen waste is subjected to sorting, hydro-thermal treatment and three-phase separation, and then solid waste obtained after the separation is added with microorganisms, so as to be fermented and generate the ethyl alcohol and the lactic acid; waste water obtained after the separation can be reused in a fermentation tank, and residual waste water of the kitchen waste can be purified and then be discharged or reused; grease obtained after the separation can be used for preparing biodiesel after being subjected to the transesterification. According to the invention, the kitchen waste is more thoroughly hydrolyzed as the hydro-thermal treatment technology is adopted; meanwhile, mixed florae are adopted for fermentation to produce the ethyl alcohol, selected cultures are simple and can be easily obtained, the preparation method is simple, the fermentation technology is simple and convenient, the fermentation effect is excellent, and the method is particularly suitable for industrialized application.

Description

technical field [0001] The invention belongs to the field of kitchen waste treatment, in particular to a method for producing ethanol and lactic acid from kitchen waste. Background technique [0002] Food waste has the characteristics of high moisture content, high content of oil and organic matter. The current processing technology mainly focuses on oil refining biodiesel, anaerobic fermentation to produce biogas and ethanol, microbial fermentation to produce feed, fertilizer, etc. Among them, biodiesel is obtained by directly separating kitchen waste oil through transesterification; ethanol is usually produced by saccharification and hydrolysis of kitchen waste and then adding yeast to ferment. The invention patent "a lactic acid antibacterial method suitable for the fermentation of food waste" (CN101665809B) is to add lactic acid bacteria to the food waste to produce lactic acid to achieve bacteriostasis, and then add yeast to ferment. Invention patent "a method for com...

Claims

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Application Information

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IPC IPC(8): C12P39/00C12P7/14C12P7/08C12P7/56C12R1/84C12R1/66C12R1/845C12R1/865C12R1/885C12R1/25C12R1/01
CPCY02P20/582
Inventor 王春铭
Owner SOUTH CHINA AGRI UNIV
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