Method for producing bioethanol through anaerobic fermentation of kitchen waste

An anaerobic fermentation, kitchen waste technology, applied in the field of environmental engineering, can solve the problems of extremely high equipment quality requirements, difficult practical application, complex pretreatment process, etc., to achieve both environmental and economic benefits, and improve the abundance of yeast. the effect of reducing equipment investment

Inactive Publication Date: 2020-05-08
长沙工研院环保有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This patented technology uses multi-stage pretreatment technology to improve the conversion efficiency of food waste and increase the yield of ethanol, but the pretreatment process of this technology is complicated, requiring exclusive ethanol-type fermentation bacteria, and the hydrothermal and microwave pretreatment stages need to maintain a high Pressure or temperature requires extremely high equipment quality, so the practical application of this technology is difficult

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  • Method for producing bioethanol through anaerobic fermentation of kitchen waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) After the food waste collected and transported by a food waste harmless and resourceful treatment plant has been sorted, crushed, and oil extracted, the particle size of the crushed food waste is below 8mm. The TS of the mixed slurry is 5%, the SCOD is 20000mg / L, and the pH is 6.

[0032] (2) The slurry is transported to an ultrasonic device for joint pretreatment, wherein the ultrasonic frequency is 50 Hz, the temperature is controlled at 20 °C, and the H 2 o 2 The dosage of the solution is 50mg / g TS, and the pH of the system is adjusted to 7 by using 5M NaOH solution. After ultrasonication for 30 minutes, the dissolution rate of kitchen waste was 35%.

[0033](3) After pretreatment, the mixed slurry is pumped into an anaerobic fermentation tank, and activated yeast powder and biochar are added at the same time. Among them, the dosage of yeast powder is 0.1%, and the activation steps of yeast powder include: dissolving in 10 times the mass of distilled water, ke...

Embodiment 2

[0035] After the food waste is sorted, crushed, and oil-extracted, the mixed slurry has a TS of 15%, a SCOD of 60,000 mg / L, and a pH of 4. Dosing H according to the dry matter of kitchen waste 2 o 2 The dosage is 350mg / g TS, the pH of the control system is 11, the ultrasonic device is started, the ultrasonic frequency is adjusted to 250Hz, the ultrasonic time is 90min, the temperature is controlled at 80°C, and the corresponding kitchen waste dissolution rate is 75%. Add activated yeast powder and biochar to the anaerobic fermentation tank, the dosage is 0.3% and 1.5g / gTS respectively, and the BET of biochar is 500m 2 / g, electron transfer ability EDC and EAC are 0.5mmol e / g. The fermentation temperature is 40°C, and the fermentation time is 10 days. The ethanol concentration in the final distillate fraction was 29530mg / L.

Embodiment 3

[0037] After the food waste is sorted, crushed, and oil-extracted, the TS of the mixed slurry is 10%, the SCOD is 40,000 mg / L, and the pH is 5. Dosing H according to the dry matter of kitchen waste 2 o 2 The dosage is 200mg / g TS, the pH of the control system is 9, the ultrasonic device is started, the ultrasonic frequency is adjusted to 150Hz, the ultrasonic time is 60min, the temperature is controlled at 50°C, and the corresponding kitchen waste dissolution rate is 55%. Add activated yeast powder and biochar into the anaerobic fermentation tank, the dosage is 0.2% and 1.0g / gTS respectively, and the BET of biochar is 800m 2 / g, the electron transfer ability EDC and EAC are both 0.9mmol e / g. The fermentation temperature is 35°C, and the fermentation time is 7.5 days. The ethanol concentration in the final distillate fraction was 33530mg / L. The implementation effect is better than that reported in the published patent CN109761465A "A Method for Anaerobic Ethanol Production f...

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Abstract

The invention discloses a method for producing ethanol through anaerobic fermentation of kitchen waste. The method comprises the following steps: carrying out sorting pretreatment on the collected andtransported kitchen waste; carrying out ultrasonic/alkali/H2O2 combined pretreatment on the sorted and oil-extracted kitchen waste to promote the hydrolysis process of the kitchen waste; and carryingout anaerobic fermentation on pretreated slurry, and conducting separating after fermentation to obtain the bioethanol. According to the method, the ethanol yield of the anaerobic fermentation of thekitchen waste is increased; and meanwhile, preparation process is simplified, and a technical method with higher feasibility is provided for recycling of the kitchen waste.

Description

technical field [0001] The invention relates to a treatment method for kitchen waste, in particular to a method for producing bioethanol by anaerobic fermentation of kitchen waste, and belongs to the technical field of environmental engineering. Background technique [0002] Kitchen waste comes from restaurants, canteens and other catering industries in cities. Although the composition and characteristics of food waste are affected by factors such as regional differences, economic conditions, and eating habits, in general, its general characteristics are high moisture content, a large amount of organic substances such as starch and cellulose, and it is easy to be corrupted and smelly. If germs and pathogenic microorganisms are not handled properly, they will seriously affect the appearance of the city and the living environment of people. Therefore, it is imperative to harmless, reduce and recycle food waste. [0003] In view of the high biodegradability of food waste, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/08C12R1/645
CPCC12P7/08
Inventor 尹常凯李昌武史学峰吴志恒宾震东廖栩葛燚
Owner 长沙工研院环保有限公司
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