Biogas slurry ecological purification method based on microalgae cultivation

Abstract

The invention discloses a biogas slurry ecological purification method based on microalgae cultivation. The method comprises the following steps: (1) biogas slurry pretreatment; (2) habituated culture of autotrophic microalgae, namely, obtaining algae strains capable of rapidly growing in 70%-100% biogas slurry; (3) preparation of a seed solution; (4) a biogas slurry purification method during growing of microalgae, namely, after expanded cultivation, inoculating the habituated algae species into an open photobioreactor for cultivation, obtaining chlorella biomass growing by high density through a semi-continuous culture method and optimized methods such as fed-batch cultivation, and purifying the biogas slurry; (5) biochemical breaking of microalgae cell walls, namely, introducing the microalgae cells into a biochemical wall breaking pool, putting freshwater fish into the pool, and obtaining algae slurry subjected to wall breaking; and (6) collection of the microalgae cells and recycling of the biogas slurry. According to the method, not only is a method provided for purifying the biogas slurry, but also the obtained algae cells and the biogas slurry can be recycled, so that ecologicalization treatment of the biogas slurry is realized, the environment is improved, and furthermore, the economic and social benefits are produced.

Description

technical field [0001] The invention relates to a purification method of biogas slurry, in particular to an ecological purification method of biogas slurry based on microalgae cultivation. Background technique [0002] Biogas slurry, also known as "anaerobic fermentation liquid", is a water-soluble by-product remaining after anaerobic fermentation of organic matter such as animal manure and straw. With the adjustment of agricultural industrial structure and the construction of new countryside, the intensive livestock and poultry breeding industry has developed rapidly. As the product of anaerobic fermentation of biogas, the biogas slurry produced in my country is about 200 million tons per year. These waste liquids are used as agricultural fertilizers. Or direct discharge, rarely consider whether the discharge is up to standard or not and its agricultural safety. In fact, after anaerobic digestion, the biogas slurry still contains a large amount of nitrogen, phosphorus and m...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a biogas slurry ecological purification method based on microalgae cultivation, which solves the problem that a large amount of biogas slurry produced by livestock and poultry breeding is directly discharged to pollute the environment without treatment, and conventional sewage treatment methods are costly, difficult to operate, and denitrification. , Phosphorus removal effect is poor, common problems that are difficult to promote

Images