System and method for preparing high-concentration biomass carbon source from kitchen waste

Abstract

The invention discloses a system and method for preparing a high-concentration biomass carbon source by using kitchen waste. The method comprises the following steps: an extrusion cooking fat extraction hydrothermal treatment subsystem is separately provided with a kitchen waste inlet, a slurry outlet and at least one steam inlet, and the slurry outlet is connected with a biodegradation device; a biological hydrolysis device is provided with a fermentation liquid outlet and a fermentation residue outlet separately, the fermentation liquid outlet is connected with a filtering and purifying device, and the fermentation residue outlet is connected with an anaerobic fermentation device; a biogas outlet of the anaerobic fermentation device is connected with a fuel gas heating device; the fuel gas heating device is provided with at least one steam output port, and the steam output port is connected with the steam inlet of the extrusion cooking fat extraction hydrothermal treatment subsystem; and the filtering and purifying device is provided with a high-concentration biomass carbon source output port. According to the system, macromolecular organic matters such as cellulose, fat, carbohydrate and protein in the kitchen waste can be efficiently hydrolyzed, the macromolecular organic matters are converted into easily-biodegraded micromolecular organic matters, the utilization rate of the organic matters is increased, and a carbon source with a high COD concentration is prepared.

Description

technical field [0001] The invention relates to the field of resource utilization of kitchen waste, in particular to a system and method for preparing a high-concentration biomass carbon source by using kitchen waste. Background technique [0002] At present, the common treatment methods of food waste mainly include anaerobic digestion for methane production, composting, feed, etc. These processes can achieve the reduction and recycling of urban organic waste to a certain extent. However, due to many reasons such as low product income and difficulty in digesting biogas residues, most of the existing kitchen waste disposal projects have low actual operating load rates, poor profitability, low resource utilization rates, and secondary pollution during the disposal process. . [0003] In sewage treatment plants, especially those in the south where C / N is seriously unbalanced, the high cost of carbon sources is still a key consideration in the process of sewage treatment. The q...

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Problems solved by technology

[0004] In recent years, relevant research institutions at home and abroad have done some research on the preparation of carbon sources from organic waste, but the existing schemes (such as: a kind of denitrification soluble carbon source disclosed in Chinese patent CN201410628408.3 using kitchen waste to produce wastewater Method; Chinese patent CN201310164723.0 discloses a method for utilizing food waste anaerobic carbon source; Chinese patent CN201410281875.3 discloses a method for producing volatile fatty acids through facultative anaerobic fermentation of food waste), the The prepared carbon source only performs simple hydrolysis and acidification on the organic waste after pretreatment such as simple physical crushing, and the effective COD equivalent of the obtained carbon source product is not high, which belongs to the low-concentration carbon source product. In use, it is calculated according to the effective COD equivalent. Compared with traditional carbon source products, the amount used is larger, and the transportation radius is limited and the transportation cost is high. At the same time, the existing scheme uses a large amount of chemicals, which will cause secondary pollution.

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