Method for producing marsh gas through mixed anaerobic fermentation of blue algae and sludge

Abstract

The invention provides a method for producing biogas by the anaerobic fermentation of mixed blue algae and sludge, which belongs to the technical field of environmental protection purification and waste resource treatment. In the method, the blue algae and the sludge are mixed for the anaerobic fermentation to produce the biogas, and the whole process is completed in an anaerobic reactor; the blue algae and the sludge are mixed in the rector, N2 is introduced to form the anaerobic state, and the blue algae and the sludge are fermented at a temperature of between 35 and 37 DEG C; and in the rector, the blue algae is discontinuously and periodically added, the degradation condition of the material is observed, at the same time, the organic matter concentration of the discharged material and the concentrations of CH4 and CO2 in gas generated from fermentation are measured until the reactor is stably operated. The biogas generated is subjected to desulphurization treatment and supplied to users for combustion or collected for power generation; and the dregs generated are used as a fertilizer for farmlands. The method for producing the biogas by the anaerobic fermentation of the mixed blue algae and the municipal sludge has the advantages of having the effect of answering multiple purposes, thoroughly eliminating algae toxins, combining the blue algae utilization and the treatment of the sludge from a municipal sewage plant, and solving organic pollution problems in both the rural and urban areas.

Description

technical field [0001] The invention discloses a method for producing biogas by mixed anaerobic fermentation of cyanobacteria and sludge, which belongs to the technical field of environmental protection purification and waste resource treatment. Background technique [0002] The massive reproduction of algae in eutrophic water body causes the outbreak of algae bloom, which has a serious impact on the surface water quality and ecosystem: the water quality is polluted and smelly, the transparency decreases, the sensory properties deteriorate, and the concentration of dissolved oxygen in the water body decreases rapidly, causing Aquatic organisms die in large numbers due to lack of oxygen. The most worrying thing is that when some algae (mainly Microcystis aeruginosa) break down and die, their cell lysis will lead to the release of intracellular toxins, which will bring cyanobacteria resources. difficult. The research results show that the main target organ of microcystins (MC...

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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