Biogas slurry reduction treatment and biogas collaborative purification system and purification method

Abstract

According to a biogas liquid reducing treatment and a biogas collaborative purification system and purification method disclosed by the present invention, by adding plant ash into the biogas liquid, alkalinity and pH value of the biogas liquid are increased, biogas liquid COD and suspended matter concentration of the biogas liquid are reduced, and by film decompression concentration technology, ammonia is recovered from the biogas liquid and biogas liquid concentration is performed, and therefore an objective of ammonia nitrogen content control in the biogas liquid and biogas liquid reducing treatment is achieved. In the biogas liquid film decompression process, ammonia enrichment can be further achieved, biogas can be desulfurized and decarburized at the same time by using enriched ammonia from the biogas liquid, and therefore preliminary purification of the biogas is achieved, then ammonia gas (NH3) entrained in the biogas is washed and CO2 in the biogas is further absorbed by using concentrated biogas liquid with high pH value, and therefore the biogas is purified and nitrogen content in the biogas liquid is controlled. The present invention can realize the biogas liquid reducing treatment, increase the nutrient content in the biogas liquid, and ensure that the ammonia nitrogen content is in a reasonable utilization range; and meanwhile the present invention is relied on low grade energy, and can therefore reduce costs.

Description

technical field [0001] The invention relates to the technical field of biogas liquid treatment and biogas purification in biogas engineering, in particular to a biogas liquid reduction treatment and biogas synergistic purification system and purification method. [0002] technical background [0003] Biogas, biogas residue and biogas slurry can be obtained by anaerobic fermentation of organic wastes such as livestock and poultry manure, crop straw, kitchen waste, etc. Among them, biogas, as a clean renewable energy, can realize carbon dioxide (CO2) in the energy utilization process. 2 ) near zero emissions, 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. However, at this stage, China's major large and medium-sized biogas projects all use mature wet anaerobic fermentation technology, which produces a large amount ...

AI Technical Summary

Problems solved by technology

Plant ash can be used as fertilizer directly, but because of its high alkalinity, low fertilizer efficiency, and bulky volume, its utilization rate is low, and it is piled up around the biomass power plant in large quantities, becoming the waste of the biomass power plant

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