System and method for generating methane and synchronously removing heavy metal from heavy metal-containing organic solid wastes

Abstract

The invention discloses a system and a method for generating methane and synchronously removing heavy metal from heavy metal-containing organic solid wastes, and belongs to the technical field of the digestion of organic solid wastes. The system comprises a biological acidification reactor, a chemical acidification reactor, a pH regulation reactor, a solid-liquid separation reactor, a crystallization inducing reactor and a methane generating reactor, wherein stirrers are arranged in the biological acidification reactor, the chemical acidification reactor and the pH regulation reactor. The method comprises the following steps of: biological acidification, chemical leaching, pH regulation, solid-liquid separation, crystallization induction, anaerobic fermentation and the like. By the method, the digestion speed of the solid wastes can be improved effectively, the yield of the methane can be increased, and the heavy metal in the wastes can be removed to realize safe agricultural utilization of fermentation residues.

Description

technical field [0001] The invention belongs to the technical field of organic solid waste digestion, and in particular relates to a system and method for synchronously removing heavy metals by generating methane from organic solid wastes containing heavy metals. Background technique [0002] At present, organic solid waste represented by livestock and poultry manure and residual sludge from sewage treatment plants has a large amount of production and concentrated production areas. A large amount of discharge may cause air, surface water and groundwater pollution, thereby endangering human health. In addition, in addition to the high content of organic matter, the above-mentioned organic solid wastes also contain relatively high concentrations of heavy metals. Considering that the final destination of these solid wastes is generally farmland or soil, they will return to the soil for a long time without treatment. In addition to causing soil and groundwater pollution, it may ...

AI Technical Summary

Problems solved by technology

[0004] However, the anaerobic digestion process can only degrade the organic matter in solid waste, and heavy metals still remain in the biogas slurry and biogas residue after anaerobic digestion treatment, which directly affects the safety of agricultural utilization of biogas slurry and biogas residue

At the same time, the efficiency of traditional anaerobic digestion technology for organic solid waste needs to be further improved

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