Improved blue algae treatment utilization method

Abstract

This invention is an improved method for dealing with cyanobacteria, which can realize a harmless and resourceful treatment of cyanobacteria with automatic control, low operation cost, no secondary pollution and easy management. The method is characterized in that cyanobacteria and animal manure or sludge and other biomass can be used together as the fermentation material to obtain biogas through anaerobic digestion and the biogas is used to generate power or is burned for a direct use, and the biogas residue and biogas slurry are recovered to field or the biogas residue can be developed into feeds or organic fertilizers.

Description

(1) Technical field [0001] The invention relates to the technical field of waste resource treatment, in particular to a method for producing biogas by anaerobic fermentation of mixed cyanobacteria and livestock manure or sludge. (2) Background technology [0002] In nutrient-rich water bodies, cyanobacteria often multiply in large numbers in summer, and form a layer of blue-green and fishy-smelling floating foam on the water surface, which is called "water bloom", and large-scale cyanobacteria outbreaks are called "green tides". (corresponding to the red tide that the ocean produces). Green tides cause water quality to deteriorate, and in severe cases deplete the oxygen in the water and cause the death of fish. What's more serious is that some species of cyanobacteria (such as Microcystis) also produce toxins (MC for short), and about 50% of green tides contain a large amount of MC. In addition to direct toxicity to fish, humans and animals, MC is also an important cause o...

AI Technical Summary

Problems solved by technology

Compared with other utilization methods, direct returning to the field is the most economical method, but it is not the safest method, because cyanobacteria contain algal toxins, how do these algal toxins affect seeds, roots, stems, and leaves, and how to digest them in soil The law is still unclear. Although farmers along the lake have a tradition of using indigo as fertilizer, this tradition is reasonable, but not necessarily scientific.

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