Kitchen waste resource utilization method

Abstract

The invention relates to the technical field of environmental biology, in particular to a kitchen waste resource utilization method which comprises the steps that a natural aerobic pretreatment technology and a plasma pretreatment technology are combined to promote the hydrolysis and fermentation performance of kitchen waste, and a substrate capable of being directly utilized is provided for the subsequent anaerobic digestion stage; meanwhile, the pretreated supernate is rich in small molecular organic acid, enough carbon sources and electron donors are provided for the stage of degrading perchlorate by a biological method, and high-concentration perchlorate is degraded. The technical problems existing in anaerobic fermentation in the prior art are solved, the acid and methane production performance of the kitchen waste is remarkably improved, and meanwhile an economical and effective electron donor is provided for degrading perchlorate through a microbiological method.

Description

technical field [0001] The invention belongs to the field of environmental biotechnology, and specifically relates to a method for resource utilization of food waste, in particular to a pretreatment technology for improving the methane production performance of food waste, and a food waste pretreatment matrix as an electron donor with high degradation rate Chlorate technology. Background technique [0002] As an important part of municipal solid waste, kitchen waste accounts for 40-60%. Therefore, reasonable disposal of kitchen waste is extremely important to the treatment of municipal solid waste, because kitchen waste is rich in various organic substances, including sugar and protein. Fat and fat are prone to corruption in a very short period of time, leading to the breeding of insects and flies and producing a huge odor, endangering the environment and posing a huge threat to human health. [0003] At present, there are many traditional technologies for dealing with food...

AI Technical Summary

Problems solved by technology

[0002] As an important part of municipal solid waste, kitchen waste accounts for 40-60%. Therefore, reasonable disposal of kitchen waste is extremely important to the treatment of municipal solid waste, because kitchen waste is rich in various organic substances, including sugar and protein. and fat, which are prone to corruption in a very short period of time, leading to the breeding of insects and flies and producing a huge odor, endangering the environment and posing a huge threat to human health

[0003] At present, there are many traditional technologies for dealing with food waste, including aerobic composting, incineration and sanitary landfill, but the above methods do not consider the chemical value of food waste, and will also cause secondary pollution; for example, aerobic composting It needs to occupy a large amount of space, and incomplete composting will cause a large number of viruses and bacteria to still exist in the compost body, endangering human health; a large amount of toxic and harmful gases (such as dioxin and 2,3,7,8-tetrachlorodiphenyl And - p - dioxin (2,3,7,8-TCDD) etc.); Sanitary landfill is an unsustainable technology that wastes land resources, and heavy metals and toxic and harmful substances pass through the landfill process Infiltration pollutes groundwater, causing irreversible pollution

[0004] Anaerobic digestion is considered to be a promising resource treatment technology for food waste because it can effectively utilize the organic matter in food waste and convert it into clean energy biogas; There are still many problems in the oxygen digestion process, such as the accumulation of volatile organic acids, the imbalance of C / N ratio, and the lack of trace elements, which lead to unstable operation of the system and low methane production content

In order to solve the above problems, a variety of pretreatment methods have been introduced in the anaerobic digestion process of food waste, which can be generally divided into physical methods (ultrasonic, mechanical crushing, heating, etc.), chemical methods (acid-base adjustment, adding oxidants, etc.) / surfactants, etc.) and biological methods (adding strains), these pretreatment technologies have more or less improved the methane production performance and methane production of anaerobic digestion of kitchen waste, but due to high energy consumption, high cost and other issues, and Not widely used in practical engineering

[0005] In addition, ammonium perchlorate is used as a solid propellant, and the strong oxidants contained in it are often removed by microbial methods, but it is necessary to consider providing sufficient electron donors for the microbial system during the microbial treatment process. Currently, external carbon sources ( Sodium acetate) for degradation, but in actual engineering, the cost of external dosing is high and there are hidden dangers. Therefore, it is imperative to find cost-effective organic matter as an external carbon source and electron donor.

[0006] In summary, it is urgent to find an economical and efficient treatment method to solve the problems of low methane production and unstable system operation in anaerobic digestion of food waste, so as to ensure that a large amount of food waste generated in the environment can be effectively treated and disposed of ; At the same time, a treatment method is needed to provide electron donors and carbon sources for microbial degradation of perchlorate

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