A continuous system using microalgae and aquatic plants to jointly treat pig biogas slurry with high ammonia nitrogen

Abstract

The invention discloses a continuous system for processing high ammonia-nitrogen pig raising biogas slurry by combining microalgae and aquatic plants. According to the system, microalgae and aquatic plants are used as the basis for building an efficient low-consumption standard reaching processing continuous system of the high ammonia-nitrogen pig raising biogas slurry; meanwhile, microalgae biomass and plants are harvested. The continuous system has the concrete steps that pig raising waste water is subjected to solid-liquid separation and then enters an anaerobic fermentation pool; the generated high ammonia-nitrogen biogas slurry enters a microalgae and aquatic plant composite system to be processed after pH value and nutrition salt regulation; bio-chemical effluent flows into a flocculating settling pool and a sterilization pool; then, clean water is discharged in a standard reaching way. The continuous system provided by the invention has the advantages that the operation is simple; the nutrition substance removal efficiency is high; the operation cost is low; the harvested microalgae biomass can be used as feed and non-grain raw materials of biodiesel; in addition, secondary pollution is not generated.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a continuous system for jointly treating pig biogas slurry with high ammonia nitrogen by using microalgae and aquatic plants. Background technique [0002] With the continuous development of intensive aquaculture, a large amount of aquaculture wastewater has been brought. At present, the treatment of aquaculture wastewater generally undergoes anaerobic fermentation first, and the generated biogas slurry is then discharged after primary treatment, primary intensive treatment or secondary biochemical treatment. However, the biogas slurry after anaerobic treatment still has high pollutants such as ammonia nitrogen and heavy metals. If it is directly discharged, it will lead to eutrophication of the water body. As the country's requirements for sewage discharge become more and more stringent, the treatment of this type of biogas slurry has become an urgent problem to...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a continuous system that uses microalgae and aquatic plants to jointly treat high-ammonia-nitrogen pig biogas slurry, so as to solve the common problems of high ammonia-nitrogen biogas slurry processing cost, difficult operation, poor effect, and difficult to promote in current pig farms.

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