Preparation method of membrane material capable of promoting denitrification and for pond culture

Abstract

The invention discloses a preparation method of a membrane material capable of promoting denitrification and for pond culture. The membrane material is prepared from the following raw materials: silicon dioxide, 2-(4-phenyl chlorosulfonate)ethyl trimethoxysilane, corn starch, glucose, glacial acetic acid, chitosan, chloroacetic acid, silver nitrate, beta cyclodextrin and polyacrylic acid. Multi-step modification is conducted by selecting the silicon dioxide, the aim of adsorbing nitrite is fulfilled by depending on the huge specific surface area of the silicon dioxide and the stable and ordered pore channel structure, the obtained silver particle loaded chitosan, the modified silicon dioxide and the beta cyclodextrin are embedded on the basis, a stable fiber membrane structure is formed through electrostatic spinning and thermal crosslinking, organic carbon is supplemented for the membrane structure through dipping of the corn starch and the glucose, denitrifying bacteria occupy dominant position in sediment aquaculture, the nitrogen content of the sediment and aquatic water is reduced, a good environment is provided for biological breeding, the quality of aquatic products is improved, and the preparation method is suitable for being widely used in pond culture.

Description

technical field [0001] The invention relates to the technical field of water body purification, in particular to a preparation method of a membrane material for pond culture that promotes denitrification. Background technique [0002] Pond aquaculture occupies an important position in my country's aquaculture system. The 2016 China Fishery Statistical Yearbook shows that: my country's freshwater aquaculture ponds are 2.7×1010 square meters, accounting for more than 43.9% of the total aquaculture production. Due to the one-sided pursuit of high yield in the traditional freshwater pond culture, a large amount of bait and fertilization is used, and the accumulation of residual bait and excrement of the cultured objects will pollute the culture environment. In addition, the wide application of high-density intensive farming models has led to an increase in the concentration of nitrogen, phosphorus and other elements in the water body, and nitrogen, sulfur and other elements in o...

AI Technical Summary

Problems solved by technology

Usually, membrane materials can only retain bacteria and have no antibacterial or bactericidal functions. Therefore, membrane biofouling is a technical problem in the field of membrane use and separation technology.

[0005] Chitosan is a natural cationic polysaccharide, which has the advantages of wide sources, low price, non-toxic and harmless, and degradable. Its molecular chain contains a large number of amino groups and hydroxyl groups, which can form stable chelates with many metal ions. Due to the insoluble properties of chitosan in common solvents, its application is limited