Preparation process of composite material for solid-state nitrogen removal in circulating aquaculture water

Abstract

A preparation process of composite material for solid-state nitrogen removal in circulating aquaculture water comprises preparing PHBV nanoparticle solution: dissolving PHBV raw material in binary organic phase solvent, and stirring to obtain PHBV polymer solution; preparing antisolvent; adding the PHBV polymer solution into the antisolvent and stirring to form a PHBV nanoparticle solution for standby, wherein that particle size of the PHBV nanoparticle is 100-2000nm. Biomass carbon is prepared by pyrolysis and carbonization of plant raw materials under that protection of inert gas to obtain semi-finished biomass carbon, pulverizing and sieving to obtain biomass carbon. A composite material is prepared by adding biomass carbon into the PHBV nanoparticle solution, stirring to obtain a mixedphase; heating and evaporating the mixed phase to dryness under negative pressure, washing with dilute acid, washing with water and drying to obtain a biomass carbon composite material adsorbing nanometer PHBV particles. The invention can effectively absorb the nutrients of the water body, and improve the biological contact area between the microorganism and the PHBV.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation process of a nano-PHBV particle-biomass charcoal composite material used for solid-phase denitrification of circulating aquaculture water. Background technique [0002] Bio-black carbon is a good water nutrient adsorption material, which can effectively adsorb NO 3 - -N and NH 4 + Nitrogen nutrients such as -N; at the same time, PHBV (polyhydroxybutyrate valeric acid copolyester) is considered to be used by microorganisms as a carbon source for nitrification and denitrification, thereby enhancing the denitrification capacity of the water treatment system and reducing the risk of toxic substances. Cumulative problems in aquaculture. [0003] The current PHBV denitrification technology mainly uses PHBV granular materials without adding nutrient adsorption materials, resulting in a short retention time of nutrients when the water passes through the biofilte...

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Problems solved by technology

[0003] The current PHBV denitrification technology mainly uses PHBV granular materials without adding nutrient adsorption materials, resulting in a short retention time of nutrients when the water passes through the biofilter, and a small contact area between microorganisms and PHBV, making it difficult to achieve effective water purification in a short period of time. effect; on the other hand, the existing PHBV granular material itself also has shortcomings such as too large a particle size, which limits the absorption efficiency of microorganisms on carbon sources

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