Method for removing grit and light impurities in kitchen waste slurry and grit settling system

Abstract

The invention relates to a method for removing settled sand and light-weight foreign matters in slurry of kitchen wastes and a sand settlement system for same. The slurry entering the desanding tank is treated through a plurality of separation plates to block sand foreign matters step by step, wherein the sand foreign matters are settled into a sand bin; the light foreign matters flow along with the slurry and are discharged into the mixing tank; during sand cleaning, water feeding is stopped, sand washing is conducted, most of slurry is discharged into the mixing tank, then a shaftless screwconveyor is started to turn over the sand foreign matters, and meanwhile the high-pressure nozzles spray high-pressure water to wash the settled sand; and after sand washing is finished, the shaftlessscrew conveyor outputs the settled sand, a stirrer in the mixing tank is used for fully stirring the collected slurry subjected to sand removal, and the uniformly mixed slurry is pumped into a scum removal system through the slurry; and a screw blade in the conveying screw conveyor pushes the mixed solution to separate the light-weight foreign matters from the wastewater, and the separated lightimpurities are discharged after being extruded. According to the method, the sand-containing oak impurities and the scum in the kitchen waste slurry can be effectively removed, and the loss of easilydegradable organic matters and grease can be reduced.

Description

technical field [0001] The invention relates to a method for removing grit and light sundries of kitchen waste slurry and a grit settling system thereof, belonging to the technical field of kitchen waste treatment. Background technique [0002] The composition of the food waste slurry includes the following situations: 1. The waste water mixture after the food waste receiving hopper is drained and the food sorting and crushing is separated by solid and liquid; 2. The food waste hopper is drained and the food waste is sorted and crushed The material mixture after high-temperature cooking; 3. The comprehensive wastewater containing oil, sand and scum produced in the pretreatment process of other processes, its TS≤15%. In addition to the kitchen waste slurry, the slurry contains grit of ceramics, glass, bones and other inert inorganic substances, as well as light debris such as plastic sheets, fibers, fabrics and other refractory light debris. [0003] The basic composition of...

AI Technical Summary

Problems solved by technology

At present, during the use of the three-phase oil extraction machine, there are mainly the following problems: 1. Light debris such as plastic sheets, fibers, etc. will block the oil outlet and water outlet, resulting in frequent disassembly, cleaning and dredging of the equipment, affecting production

2. Heavy substances such as gravel, bones and ceramic particles entering the three-phase oil extraction will increase wear, reduce equipment service life and increase maintenance costs

Similarly, the current anaerobic system also has the following problems in the treatment of kitchen waste slurry: 1. Due to the accumulation of sand at the bottom of the anaerobic tank, the effective volume of the anaerobic tank will be reduced over time. To a certain extent, the tank must be cleaned

2. The accumulation of scum including fibers and plastics in the upper part of the anaerobic tank will also affect the normal operation of the anaerobic system and bring adverse effects

Due to the use of fans or air compressors for aeration, not only the noise is large, but also it is not conducive to the sedimentation of sand and gravel

Furthermore, the separation equipment cannot solve the problem of scum mixture in the garbage slurry, and it will still affect the normal operation of the subsequent oil extraction and anaerobic system

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