Biochemical-thermochemical multi-point cross-linking method and system for treating biomass waste

Abstract

The present invention discloses a biochemical-thermochemical method and system for multipoint crosslinking a biomass waste. The present invention applies solid, gaseous and liquid products of a thermochemical treatment subsystem to a biochemical treatment subsystem, and applies the heat generated by the biochemical treatment subsystem to the thermochemical treatment subsystem to form a multipoint two-way interconnection between the biochemical treatment subsystem and the thermochemical treatment subsystem, thereby increasing the yield and stability of gas energy of the biochemical treatment subsystem and reducing the pollution and energy consumption of the thermochemical treatment subsystem respectively. The present invention is suitable to be used for treating biomass wastes having high moisture content and low moisture content at the same time, producing a soil amendment, liquid fuel and biogas, and has features of low secondary pollution and significant reduction of greenhouse gas emission. The solid production thereof as a soil amendment has high biological stability, humus content and nitrogen content, and is convenient for storage and transportation.

Description

technical field [0001] The invention belongs to the fields of environmental protection and resource comprehensive utilization, and in particular relates to a biochemical-thermochemical multi-point cross-linking method and system for treating biomass waste. Background technique [0002] Biomass waste covers various wastes generated during biomass processing and consumption, such as the biodegradable part of municipal solid waste such as kitchen waste peels and catering waste, agricultural waste such as livestock and poultry manure, straw, etc., slaughterhouse processing waste, and brewing residue and other industrial waste, as well as municipal sludge. Biomass waste is an important renewable energy feedstock. Anaerobic digestion is a biochemical technique traditionally used to recover energy from biomass waste. Through anaerobic digestion technology, the conversion of biomass waste into green energy gas - methane can obtain the dual benefits of energy and greenhouse gas emi...

AI Technical Summary

Problems solved by technology

But in fact, the benefits of anaerobic digestion technology for treating biomass waste are far lower than expected, as shown in: 1) High concentrations of organic acids and ammonia will be produced when degradable wastes (such as kitchen waste peels, livestock and poultry manure) are degraded , these metabolites will inhibit the anaerobic digestion process after accumulating in the anaerobic digestion reactor, resulting in reduced anaerobic digestion efficiency, unstable operation or even failure, and further recovery will take a long time; 2) Refractory waste (such as , lignocellulose-rich straw, litter) due to the high lignin and cellulose content, its anaerobic degradation rate is low, and it needs to stay in the anaerobic reactor for a long time; 3) the residue after anaerobic digestion Biogas residues need to be separated into biogas slurry and biogas residue for further utilization, but the solid-liquid separation efficiency is not high, and the solid content of biogas residue can only reach about 8% to 25%, while the solid content of biogas slurry is often There are still 3% to 5%, which means that if the biogas slurry is not directly applied to the land, but is discharged into the municipal sewer, it needs further treatment, and the treatment cost of the biogas slurry is quite high; 4) due to anaerobic digestion Incomplete, there will be a large amount of degradable organic matter remaining in the biogas residue, which will lead to unstable properties of the biogas residue, easy corruption, rancidity, leachate seepage, and often require further composting before land utilization; 5) Biogas slurry and biogas residue The traditional way of consumption is land use, but as an organic fertilizer, its fertilizer effect is not as significant as that of chemical fertilizers in the short term, so its competitiveness in the market is far lower than that of chemical fertilizers; and the application of fertilizers is affected by crop planting seasons, requiring a large amount of space for biogas slurry and residue storage; especially for biomass waste generated in urban areas, due to the lack of land use places, the biogas slurry and residue produced after anaerobic digestion can only be transported to suburbs, rural areas and other places over long distances, greatly Increased shipping cost and difficulty

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