Biogas slurry concentration and nutrient enrichment system for large biogas project and application method thereof

Abstract

The invention relates to a biogas slurry concentration and nutrient enrichment system for a large biogas project and an application method thereof. The system is mainly composed of a biogas slurry pretreatment device, a sand filtration device, an ultrafiltration device, a nanofiltration device, a reverse osmosis device, a low-temperature multiple-effect evaporation device, a sludge thickening tank, a screw pump, a horizontal centrifugation machine, concentration tanks and a slurry storage tank through connection. The application method of the system comprises the steps that biogas residues and biogas slurry produced from the large biogas project firstly pass through the pretreatment device to remove suspended matter in the biogas slurry, coarse filtration is performed through the sand filtration device, the biogas slurry passes through the two-stage ultrafiltration device respectively to obtain penetrated liquid and concentrated liquid, the penetrated liquid obtained after ultrafiltration passes through the nanofiltration device to obtain ionic liquid and concentrated liquid, then the biogas slurry concentrated liquid passes through the low-temperature multiple-effect evaporation device to obtain high-concentration biogas slurry concentration liquid. The costs for capital construction and equipment investment is effectively reduced, the area occupied by equipment is decreased, the equipment utilization rate is improved, the temperature requirement in the biogas slurry concentration process is low, energy is saved, the biogas slurry concentration and nutrient enrichment system is environmentally friendly, turns waste into wealth and is remarkable in application effect.

Description

technical field [0001] The invention relates to an agricultural waste resource utilization system and an application method thereof, in particular to a biogas slurry concentration and nutrient enrichment system for large-scale biogas projects and an application method thereof. Background technique [0002] At present, large-scale biogas projects can obtain biogas, biogas residue and biogas slurry through anaerobic fermentation of organic waste such as livestock and poultry manure, crop straw, etc. Biogas, as a clean and renewable energy source, can realize carbon dioxide (CO2) in the process of energy utilization. 2 ), while biogas residue and biogas slurry are high-quality organic fertilizers, which can reduce the application of chemical fertilizers and pesticides and increase efficiency in agricultural production applications. [0003] With the huge changes in the production and life style in rural China, the seasons of fertilizer use are obvious, the land consumption is l...

AI Technical Summary

Problems solved by technology

[0003] With the huge changes in the production and life style in rural China, the seasons of fertilizer use are obvious, the land consumption is limited, and the added value of biogas residue and biogas slurry is not high. It is very easy to cause the direct discharge of biogas slurry and lead to secondary pollution; and the standard discharge treatment mode of biogas slurry also has problems such as large area occupation, large investment and high operation cost

Images