Feces desander and desanding method

Abstract

The invention relates to a device for removing sand from excrement, which comprises a grit chamber. The grit chamber is separated into multistage overflow structures through a detachable gate, and the sand in the excrement is separated through gradual overflow of the grit chamber after the excrement and water are mixed. The invention also relates to a method for removing sand from excrement. The sand in the excrement is separated through a gradual overflow mode, the sand with the particle diameter lower than fine sand can be separated, and the sand content after sand removal can be lower than 3 percent. In addition, the method can adopt measures such as stirring, greenhouses, heating and the like to further improve the sand removing effect. The adopted grit chamber can be as long as about 100 meters, the width of the grit chamber is suitable for a vehicle to clean sand and stone, particularly suitable for large-scale industrialized excrement treatment, and both the sand removing effect and the efficiency are superior to a small settling or rotational flow treating process. The livestock excrement treated by sand removal can be used for generating marsh gas by fermentation or burning for power generation after drying.

Description

technical field [0001] The invention relates to a dung sand removing device, which is used for removing sand contained in dung such as cow dung from the dung by a deposition method, and belongs to the field of separation equipment. The present invention also relates to a method for removing sand from feces. Background technique [0002] Livestock and poultry manure can be used for fermentation to generate biogas or burned to generate electricity after drying, which is conducive to reducing the pollution of manure to the environment and can generate clean energy that can be used by humans. The general dairy cow breeding factory adopts sand bed, and in addition to impurities such as long grass, there is also a part of sand in the feces, which contains coarse sand with a diameter of 0.5-1.0 mm, fine sand with a diameter of 0.125-0.25 mm, and powder sand with a diameter of 0.05-0.005 mm. , the clay particle diameter is less than 0.005mm. The sand of various particle sizes cont...

AI Technical Summary

Problems solved by technology

The specific gravity of wet and fresh feces is higher than that of water, but close to that of fine sand. General centrifugation and other methods can only remove part of the sand with a particle size larger than coarse sand, and it is still difficult to completely remove the sand below the size of fine sand.

In addition, for the cold areas in the north, the lower outdoor temperature will also make it difficult for the feces to disperse, and the sand mixed in the feces is also difficult to handle.

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