Biogas fermentation liquor recycling method

Abstract

The invention discloses a method for recycling biogas fermentation liquor and belongs to the technical field of biological fermentation. Aiming at the defects in the prior art, the invention provides a biogas fermentation method which is environment-friendly, low in energy consumption and low in cost. The method comprises the following steps: extracting supernate from 1 / 3-1 / 2 of the middle upper part of a biogas fermentation tank, heating the supernate to 30-40 DEG C through a pipeline with a heating device, then enabling the supernate to pass through a box body with a positive electrode group and a negative electrode group at the voltage of 220V and the current of 60-120A, and finally enabling the supernate to pass through a box body filled with an activated carbon box, all the treated fermentation liquor returns to the biogas fermentation tank to continue fermentation. The supernate is extracted from the middle upper part of the biogas fermentation tank, and harmful ions in the biogas fermentation liquid are reduced through heating. Fine particles such as pigments and colloids in the biogas fermentation liquid are further adsorbed through activated carbon filtration. Through a series of operations, harmful substances in the biogas fermentation liquid can be removed, so that the requirement of fermentation is met.

Description

technical field [0001] The invention belongs to the technical field of biological fermentation, and in particular relates to a method for reusing biogas fermentation liquid. Background technique [0002] After biogas fermentation, the biogas residue is usually sent to make granular sludge and organic fertilizer, and the fermentation liquid is often reused after simple treatment. Due to the presence of heavy metals, pesticides, excessive ammonia nitrogen, hydrogen sulfide and other toxic substances in the fermentation broth, these harmful substances will have adverse effects on the biogas fermentation bacteria during the fermentation process, especially after repeated reuse, will seriously inhibit the growth of biogas fermentation bacteria At the same time, due to the increasing amount of ammonia nitrogen, calcium and phosphate in the biogas fermentation liquid, a large amount of struvite will be deposited in the pipeline, which will eventually block the pipeline and lead to ...

AI Technical Summary

Problems solved by technology

Due to the presence of heavy metals, pesticides, excessive ammonia nitrogen, hydrogen sulfide and other toxic substances in the fermentation broth, these harmful substances will have adverse effects on the biogas fermentation bacteria during the fermentation process, especially after repeated reuse, will seriously inhibit the growth of biogas fermentation bacteria At the same time, due to the increasing amount of ammonia nitrogen, calcium and phosphate in the biogas fermentation liquid, a large amount of struvite will be deposited in the pipeline, which will eventually block the pipeline and lead to production stagnation

[0003] The currently published technologies show that the use of flocculation and plate-and-frame filtration is a common treatment method, but the need for flocculation requires the addition of chemicals, and the energy consumption and labor costs of plate-and-frame filtration are relatively high

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