Multistage fermentation device containing fermentation liquor reflux and denitrification system

Abstract

The invention provides a multistage fermentation device containing a fermentation liquor reflux and denitrification system, and belongs to the technical field of biomass resource recovery. The device comprises a feeding system, a multistage fermentation system, a biogas residue treatment system, a solid-liquid separation system, a fermentation liquor denitrification system, a biogas liquid reflux system, biogas liquid and biogas residue pipelines, pumps, valves and flowmeters. The feeding system comprises a biomass pretreatment device and a mixed feeding device; the multistage fermentation system is formed by multiple fermentation tanks which are connected in series or in parallel; the fermentation liquor denitrification system is composed of a reactor, an aeration device with replaceable steel mesh, a stirring device, a water quality regulating device and a struvite recovery tank; the biogas liquid reflux system is composed of the biogas liquid pipeline, the pump, the valve and the flowmeter. The multistage fermentation device containing the fermentation liquor reflux and denitrification system has the advantages of being capable of cycling struvite crystals, effectively reducing ammonia nitrogen concentration in reflux fermentation liquid, relieving the fermentation system ammonia inhibition effect and improving the fermentation system performance and capable of being applied to anaerobic fermentation of biomass.

Description

technical field

[0001] The invention relates to the technical field of biomass resource utilization, in particular to a multi-stage fermentation device including a fermentation liquid reflux denitrification system. Background technique

[0002] At present, anaerobic fermentation is one of the effective means to treat biomass raw materials and organic components in municipal waste, such as kitchen waste. After anaerobic fermentation treatment, these organic matters are transformed into a large number of secondary products, biogas and solid-liquid mixed residue. Among them, biogas can be used for power generation or as fuel; solid-liquid mixed residues cannot be directly landfilled or entered into sewage treatment plants, but must undergo dehydration treatment. The biogas residue and biogas slurry formed after dehydration are finally treated, and the biogas residue can be made into organic fertilizer through aerobic fermentation; biogas slurry cannot be used directly as ferti...

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