Method for strengthening anaerobic digestion of sludge by utilizing pre-alcoholization of kitchen waste

A technology for kitchen waste and anaerobic digestion, which is applied in chemical instruments and methods, biological sludge treatment, oxidized water/sewage treatment, etc. The problems of low ethanol production efficiency, etc., achieve excellent application prospects and economic benefits, strengthen resource recovery and biogas upgrading, and achieve the effects of high methane yield

Active Publication Date: 2020-12-08
TONGJI UNIV
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Problems solved by technology

However, because straw contains refractory organic matter such as hemicellulose and lignin, the efficiency of fermentation to produce ethanol is low, and no matter whether it is straw or kitchen waste, after the alcohol is produced, it is directly mixed with sludge for anaerobic digestion, which still cannot solve the problem of pollution. The substantial problems of complex mud structure and low degradation rate limit the application and promotion of technology

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  • Method for strengthening anaerobic digestion of sludge by utilizing pre-alcoholization of kitchen waste

Examples

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Embodiment 1

[0027]This example aims to implement a method of using food waste prealcoholization to strengthen sludge anaerobic digestion in the high-solid anaerobic digestion experiment using dewatered sludge as the substrate, illustrating that the present invention can improve the organic matter degradation rate and methane production rate superior performance on.

[0028] The food waste used in the experiment comes from Xueyuan Canteen of Tongji University, and its total solid (TS) and volatile solid (VS) are 16.78% and 16.33%, respectively, VS / TS=97.32%. The sludge used was dewatered sludge from a sewage treatment plant (VS / TS=46.2-68.8%, TS=18.1-25.5%).

[0029] The food waste is evenly crushed and then enters the alcohol-producing phase reactor. The effective volume of the reactor is 1 L, and the alcohol-producing reaction is carried out at a temperature of 25° C. and a pH of 5.0 for 8 hours. The fermentation residue and dewatered sludge are mixed according to the VS mass ratio of 2...

Embodiment 2

[0037] This example aims to implement a method of using food waste pre-alcoholization to strengthen sludge anaerobic digestion in the low-solid anaerobic digestion experiment using excess sludge as the substrate, illustrating that the present invention can improve the enrichment of electroactive microorganisms, improve the Superior performance in anaerobic digestion efficiency.

[0038] The food waste used in the experiment came from Xiyuan Canteen of Tongji University (TS=14.33%, VS / TS=92.15%). The sludge used was thickened sludge from a sewage treatment plant (VS / TS=50.1-65.7%, TS=3.9-5.6%).

[0039] The food waste is evenly crushed and enters the alcohol-producing phase reactor with an effective volume of 0.5 L. The alcohol-producing reaction is carried out at a temperature of 30° C. and a pH of 4.5 for 4 hours. Fermentation residue and dewatered sludge are mixed according to the VS mass ratio of 1:1 and then enter the pretreatment reactor. Ultrasonic (frequency 24kHz, pow...

Embodiment 3

[0047] This example aims to implement a method of using food waste pre-alcoholization to strengthen sludge anaerobic digestion in the high-solid anaerobic digestion experiment using mixed sludge as the substrate, illustrating that the present invention strengthens sludge anaerobic digestion to produce methane, Improve the superior performance of methane in the proportion of biogas.

[0048] The food waste used in the experiment came from Nanyuan Canteen of Tongji University (TS=13.71%, VS / TS=82.99%). What used for the sludge was the mixed sludge (VS / TS=47.7-62.1%, TS=17.3-25.2%) of the secondary sedimentation tank sludge and the dewatered sludge of the sewage treatment plant.

[0049] The food waste is evenly crushed and then enters the alcohol-producing phase reactor. The effective volume of the reactor is 4L, and the alcohol-producing reaction is carried out at a temperature of 23°C and a pH of 4.3 for 10 hours. Fermentation residue and mixed sludge are mixed according to t...

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Abstract

The invention relates to a method for strengthening anaerobic digestion of sludge by utilizing kitchen waste pre-alcoholization. The method mainly comprises the following steps: (1) performing ethanolpre-fermentation on kitchen wastes, namely feeding uniformly crushed kitchen wastes into an alcohol production phase reactor, adding yeast or adjusting the pH value and the like to make the kitchen wastes subjected to rapid and efficient anaerobic fermentation to produce ethanol, and respectively collecting fermentation liquor and fermentation residues; (2) pretreating sludge: mixing the sludge with kitchen waste fermentation residues, and then carrying out pretreatment; and (3) carrying out anaerobic digestion to produce methane: mixing the pretreated product with the kitchen waste fermentation liquor, and carrying out anaerobic digestion in a methane production phase reactor to produce methane. The invention provides a novel thought of synergistic anaerobic digestion, and ethanol in thekitchen waste fermentation liquor can enrich electroactive microorganisms in a methanogenesis phase, so that the interspecific electron transfer rate of the microorganisms is increased, and the methanogenesis efficiency is improved. According to the invention, through a multiphase reaction, resource recovery and biogas upgrading are enhanced while sludge and kitchen waste are effectively treated.

Description

technical field [0001] The invention relates to the field of organic waste treatment and resource utilization, in particular to a method for strengthening anaerobic digestion of sludge by prealcoholization of kitchen waste. Background technique [0002] Social development and human activities have produced a large amount of organic waste. In China, more than 100 million tons of kitchen waste and 60 million tons of urban sludge are produced every year. Sustained development must solve the problem. Anaerobic digestion technology is the mainstream technology for the treatment of organic waste. It realizes resource recovery while promoting the reduction, stabilization and harmlessness of organic waste. An important technical guarantee for the construction of a zero-waste city. In the anaerobic digestion process of organic waste, complex organic components need to undergo a series of biochemical steps such as hydrolysis, acidification, and acetic acidification to become small m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCC02F11/04C02F3/347C02F1/36C02F1/46C02F1/78C02F2103/32C02F2303/26C02F1/302C02F3/005C02F2203/00C02F2303/06
Inventor 戴晓虎李磊高君许颖董滨戴翎翎刘志刚
Owner TONGJI UNIV
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