Process and device for efficiently treating mixed raw material biogas slurry

Abstract

The invention discloses a process and a device for efficiently treating mixed raw material biogas slurry. The process for efficiently treating the mixed raw material biogas slurry comprises the following steps: S1, primary filtration; S2, ultrasonic scattering; S3, primary dosing and flocculation; S4, secondary dosing and flocculation; S5, efficient air flotation; and S6, efficient filter pressing. The device for the process for efficiently treating the mixed raw material biogas slurry comprises a grille dirt cleaner, an ultrasonic generator, a doser, an air floater and a filter press, wherein the output end of the ultrasonic generator is connected with the water inlet of the air floater through a dosing pipeline, the doser is communicated with the middle of the dosing pipeline through a first branch, and the doser is communicated with the dosing port of the air floater through a second branch. According to the invention, the diameter of suspended matter particles in the treated biogas slurry is controlled to be 63 microns or below, the indexes of the biogas slurry meet the requirements of various indexes of NY / T2596-2014 biogas manure, the requirement for using the biogas slurry by using a drip irrigation pipe network is met, and the national call about drip irrigation development is complied with.

Description

technical field [0001] The invention relates to the technical field of biogas slurry treatment, in particular to a process and a device for efficiently treating mixed raw material biogas slurry. Background technique [0002] Mixed biogas slurry refers to the mixed waste liquid obtained after the feces produced by animal husbandry and planting industry (straw and plant pressing residues, etc.) are mixed to prepare biogas through anaerobic fermentation. The color of the mixed biogas slurry is usually dark brown or black, has an odor, and is rich in nitrogen, phosphorus, potassium and other beneficial ingredients for crops, and can be used for farmland irrigation. Returning the biogas slurry to the field for flood irrigation will pollute the environment of the planting area and the irrigation efficiency is low. Therefore, before using the mixed biogas slurry to irrigate the farmland, it is necessary to treat the mixed biogas slurry to make the content of COD and SS in the mixed...

AI Technical Summary

Problems solved by technology

[0003] At present, the treatment methods of mixed biogas slurry generally include biochemical method and air flotation method. The biochemical method is PM dosing, which is to reduce the content of COD and SS in the mixed biogas slurry, and the COD in the mixed biogas slurry is 8000 ~15000mg / L, SS content is 9000~16300mg / L, need to use more dosage, so the cost of using PM dosing is higher; the air flotation method is to flocculate the mixed biogas slurry by filling air bubbles The final solid particles are carried to the surface of the biogas slurry, and then the flocs are removed. This method requires the diameter of the floc particles to be appropriate. However, the traditional air flotation method cannot completely match the floc particles and the bubble water, resulting in The flocs in the biogas slurry cannot completely float up, and the treated biogas slurry still contains a lot of impurities. The suspended solid particles in the biogas slurry are larger than 63 microns, which cannot meet the requirements of using drip irrigation pipe network to irrigate the biogas slurry

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