Biogas liquid and biogas residue solid-liquid separation method

Abstract

The invention relates to a biogas liquid and biogas residue solid-liquid separation method, and belongs to the technical field of general physical separating operation. The method adopts a centrifugal mechanism, an auxiliary stirring mechanism, a non-shaft spiral pressing mechanism and a squeezing mechanism for separation of a biogas liquid and a biogas residue, and the centrifugal mechanism, the auxiliary stirring mechanism, the non-shaft spiral pressing mechanism and the squeezing mechanism communicate with one another through pipe connectors orderly from front to back. The method comprises the following steps: 1) the biogas liquid and the biogas residue are subjected to first-stage centrifugal dehydration with the centrifugal mechanism, at the moment, 15-20% of water is removed, the separated biogas liquid is discharged, and the separated biogas residue is transported to the auxiliary stirring mechanism; 2) with addition of rice hull or straw powder, the rice hull or straw powder is stirred and mixed with the biogas residue in the auxiliary stirring mechanism, then the mixed material is discharged from the interior of the auxiliary stirring mechanism; and 3) the material after being mixed evenly is transported to the squeezing mechanism from the auxiliary stirring mechanism through the non-shaft spiral pressing mechanism and is subjected to second-stage squeezing dehydration with the squeezing mechanism, and at the moment, 10-15% of water is removed. The method has the advantages that the separation efficiency of the biogas liquid and the biogas residue is high, the raw materials have good adaptability and the water content of a filter cake is low.

Description

technical field [0001] The invention relates to a method for solid-liquid separation of biogas slurry and biogas residue, which belongs to the technical field of general physical separation operations. Background technique [0002] At present, the function of biogas slurry and biogas residue separation equipment is mainly to separate the biogas slurry that has been preliminarily treated, so that the residual biogas residue can be highly filtered, and the sewage can reach the standard of self-use and further treatment and discharge or make biogas slurry fertilizer . [0003] The existing biogas slurry and biogas residue separation equipment is mainly composed of fixed filter screen, screw shaft, cylinder, frame, power and other parts. The principle of the equipment with this structure is that the biogas residue is separated by the screw shaft. The biogas slurry is rotated and pushed out, and the biogas slurry is precipitated by extrusion. After separation, the biogas slurry ...

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Problems solved by technology

[0003] The existing biogas slurry and biogas residue separation equipment is mainly composed of fixed filter screen, screw shaft, cylinder, frame, power and other parts. The principle of the equipment with this structure is that the biogas residue is separated by the screw shaft. The biogas slurry is rotated and pushed out, and the biogas slurry is precipitated by extrusion. After separation, the biogas slurry has a high slag content and the sewage is turbid. It is far away from the discharge and living utilization standards, and the value of the biogas slurry cannot be fully utilized. jam

[0004] Considering the material characteristics of biogas slurry and biogas residue (moisture content is about 95%), that is, the water in the biogas slurry and biogas residue is closely combined with the material to form a state of bound water, and contains more colloidal substances, which makes it difficult to separate the biogas slurry and biogas residue. The solid-liquid separation method of biogas slurry and biogas residue is not effective

[0005] According to the applicant's understanding, the traditional separation method is mostly extensive separation, and most of the materials enter through the main axis of rotation, and all of them are gathered in the inner cylinder of the centrifuge. The materials exist in the centrifuge in a state similar to a solid cylinder, not only the machine workload Large, and low efficiency, large noise, large vibration amplitude

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