Pretreatment method for preparing biomass fuel by using restaurant garbage

Abstract

The invention discloses a pretreatment method for preparing biomass fuel by using restaurant garbage. The pretreatment method is completed according to the steps as follows: (1) bulk sundries are separated from the collected and conveyed restaurant garbage via a thick grid; (2) materials are separated into a liquid phase and solid matters through solid-liquid separation, the liquid phase is subject to oil-water separation, an oil phase is sold as a primary product and used for preparing biodiesel, and a water phase is mixed with the solid matters; (3) a mixture of the water phase and the solid matters is sent into a shearer, the materials are shorn into half-pasty matters in the shearer, and the sundries difficult to separate, such as meat, bones, metal, ceramic glass, fruit stones, and the like cannot be shorn; and (4) the meat, the bones, the metal, the ceramic glass, the fruit stones, and the like are separated from the pasty materials obtained in the step (3) via a thin grid, and the separated pasty materials are pulped and used for being biologically fermented to prepare ethanol or biogas. Not only can relative thick sundries and oil be removed, but the meat, the metal, the ceramic glass, the bones and the like which are relatively thin can be removed at the same time. Therefore, an energy regeneration treatment technology and energy regeneration treatment equipment are efficient, simple, economic and practical.

Description

Technical field [0001] The invention belongs to a pretreatment method of food waste, and particularly relates to a pretreatment method of using food waste to prepare biomass fuels such as biogas, ethanol and the like. Background technique [0002] Food waste, also known as sloppy water, mainly comes from hotels, restaurants, canteens of enterprises and institutions, households, and catering industries. It is large in quantity and mixed. The main components are starch, cellulose, protein, and lipids. At the same time, it is mixed with a little lunch box. , Chopsticks, tableware fragments, plastic bottles (bags), meat, bones and other debris. Because of its high water content, high organic content, and high salt content, it is not suitable for incineration, landfill is easy to putrefaction and smells, and produces a large amount of leachate. The high salt content restricts the application of compost. At present, there are some reports on resource utilization technologies such as m...

AI Technical Summary

Problems solved by technology

[0003] Due to the extremely complex composition of kitchen waste, the existing pretreatment process and sorting equipment such as CN200810226945.X announced a pretreatment equipment suitable for ethanol fermentation of kitchen waste, which consists of oil-water separation device, feed liquid storage tank , homogeneous device, but the equipment can remove and recycle the coarser debris and grease, but cannot remove the finer hard debris (metal, ceramic glass, meat, bone, etc.)

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