Scum and settled sand forced discharge type dry anaerobic digestion system for kitchen garbage

Abstract

The invention discloses a scum and settled sand forced discharge type kitchen garbage dry anaerobic digestion system, and relates to the technical field of kitchen garbage treatment equipment. Comprising an anaerobic reactor, a scum forced discharge system and a settled sand forced discharge system, a feed port, a discharge port, a scum discharge port, a biogas outlet and a settled sand discharge port are formed in the anaerobic reactor; the scum forced discharge system comprises a scum forced discharge screw and a first star-shaped discharge valve which are sequentially arranged at the scum discharge port; and the settled sand forced discharge system comprises a settled sand forced discharge screw and a second star-shaped discharge valve which are sequentially arranged at the settled sand discharge port. According to the device, the scum and the settled sand are timely and effectively discharged, the situation that the scum and the settled sand occupy the volume of the reactor to affect the reaction effect is effectively avoided, and the situation that the scum is gathered into layers to block the biogas outlet is avoided. And the treatment effect of treating the kitchen garbage with complex components and low solid content is greatly improved.

Description

technical field [0001] The present application relates to the technical field of kitchen waste treatment equipment, in particular to a dry-type anaerobic digestion system for kitchen waste with strong discharge of scum and settling sand. Background technique [0002] Kitchen waste comes from household kitchens, catering industries, farmer’s markets, etc. It is composed of discarded vegetables, leftovers, leftovers, fruit peels, eggshells, tea dregs, bones, etc. Therefore, the organic matter and moisture are extremely high, and it is easy to be corrupted and produces foul smells. , which need to be properly treated to convert it into biogas, fertilizer and other products. Among them, anaerobic biogas production is a common technology for organic waste recycling, including dry anaerobic and wet anaerobic methods. Among them, dry anaerobic has low pretreatment requirements, less biogas slurry production, small reactor volume, Convenient management and other advantages, so it i...

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Problems solved by technology

[0003] Some of the current kitchen waste dry-type anaerobic equipment are generally in poor operating conditions. The reason is that the solid content of kitchen waste feed is low, failing to meet the requirements of 25% to 45%. Low solid content means that the material The viscosity is low, which causes the materials in the reactor to be stratified. The top forms scum mainly composed of plant fibers, broken plastics, fine cloth strips, etc., and the middle is an anaerobic fermentation mixture composed of organic matter, inorganic matter and microorganisms. At the bottom, there is a settling sand mainly composed of sand, broken glass, broken porcelain pieces, etc.

[0004] After the material is stratified, the scum at the top of the reactor will accumulate into layers or even form a hard shell because it cannot be discharged, which will hinder the mass transfer of the system, occupy the volume of the reactor, affect the reaction effect, and may block the biogas outlet, causing Potential safety hazard; the grit at the bottom of the reactor accumulates thicker because it cannot be discharged, which will occupy the volume of the reactor, increase the rotational resistance of the agitator, and may also block the inlet and outlet

Therefore, material stratification is very unfavorable for the long-term stable operation of the anaerobic reaction system.

In fact, common dry anaerobic reaction systems, such as Kompogas in Switzerland and Strabag in Germany, are mainly used to treat organic waste with relatively single components and high material viscosity, such as crop stalks, livestock and poultry manure, and Not completely suitable for processing kitchen waste with complex components and low solid content

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