Method and system for biogas slurry fertilizer preparing by anaerobically fermenting organic perishable waste through combined heat and power generation

Abstract

The invention provides a method and system for biogas slurry fertilizer preparing by anaerobically fermenting organic perishable waste through combined heat and power generation. The system comprises a pretreatment system, an anaerobic fermentation system, a three-sectional type cyclic fermentation system, a biogas generator combined heat and power generation and waste heat coupling utilizing system and a biogas slurry producing organic fertilizer system which are connected sequentially. The pretreatment system comprises a reception tank, a bag breaking machine, a trammel screen, a winnowing and magnetic separation device, a smashing slurrying device and a sand-gravel heavy substance removing device which are connected sequentially. The anaerobic fermentation system comprises a buffer acidification tank, a pre-fermentation tank, a post-fermentation tank and a biogas storing cabinet. The biogas slurry preparing organic fertilizer system comprises a biogas slurry and biogas residue separation device, a liquid organic fertilizer preparing device and a solid fertilizer preparing device. According to the design of the method and system for biogas slurry fertilizer preparing, the biogas production rate is increased through the mode of double fermentation of the pre-fermentation and the post-fermentation and partial backflow, post-fermentation discharging which is more sufficient in digestion and more stable in property is beneficial for preparing the liquid organic fertilizer through the biogas slurry, and comprehensive energy and resource utilization efficiency of fruit and vegetable waste is improved through biogas generation and biogas slurry fertilizer preparing.

Description

[technical field] [0001] The invention relates to the technical field of organic perishable domestic waste treatment, in particular to a biogas slurry system for organic perishable waste anaerobic fermentation cogeneration of heat and power, which can make full and reasonable use of energy and significantly improve the comprehensive energy and resource utilization efficiency of fruit and vegetable waste. Fertilizer method and system. [Background technique] [0002] In March 2017, the National Development and Reform Commission and the Ministry of Housing and Urban-Rural Development jointly issued the "Implementation Plan for the Domestic Garbage Classification System". It has become increasingly prominent and has become a restrictive factor for the development of new urbanization; by the end of 2020, the implementation plan of the domestic waste classification system will basically establish a system of laws, regulations and standards related to waste classification, and form...

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Problems solved by technology

This kind of organic perishable waste has high moisture content and low calorific value. The current landfill and incineration methods result in high waste of resources and high environmental risks.

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