Method for preparing modified composite biological filler

Abstract

The invention discloses a method for preparing a modified composite biological filler and belongs to the technical field of environmental protection. According to the method, polyvinyl chloride polyhedral hollow spheres serve as a carrier, are subjected to compound-acid oxidation and then are subjected to acrylic acid grafting modification; through introducing oxo polar groups, the surface roughness and microbial film hanging performance are improved, the specific surface area and microbial attachment area are increased; due to adsorption removal capability of zeolite, vermiculite and activated charcoal to wastewater, luffa cylindrica is subjected to carbonizing treatment and then is compounded with the zeolite and the vermiculite, and FeAl precipitates are adsorbed; FeAl oxide doped composite powder is prepared through high-temperature calcination, so as to further improve the adsorption removal capability; meanwhile, due to biological film growth promoting action of Fe, the film hanging time is shortened; and finally, the composite powder is stuck to surfaces of the modified polyvinyl chloride polyhedral hollow spheres treated with polyvinyl alcohol, so as to prepare the modified composite biological filler. The prepared modified composite biological filler has the advantages that the stability is good, the specific surface area is large, the surface is rough, and biological films are difficult in falling-off.

Description

technical field [0001] The invention discloses a preparation method of a modified composite biological filler, which belongs to the technical field of environmental protection. Background technique [0002] In the field of wastewater treatment, due to cost advantages, microorganisms are often used to treat wastewater from various sources, such as urban domestic wastewater, industrial wastewater, and wastewater produced by coal gasification processes. In the process of treating wastewater with microorganisms, fillers are often used as carriers for the reproduction and growth of microorganisms. Microorganisms grow in large numbers and form a film-like biological community on the filler, forming a food chain that can effectively remove organic pollutants in water. This kind of filler is called biological filler. [0003] There are many types of biological fillers, such as shaped fixed fillers, suspended fillers, suspended fillers and combined fillers. This type of filler is g...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: the currently used biological fillers have poor stability, poor microbial film-hanging performance, small specific surface area, smooth surface, and easy biofilm falling off, which often leads to blockage, agglomeration, and gas distribution during use. The defect of uneven water distribution and poor oxygenation performance provides a method for modifying composite biological fillers. The invention uses polyvinyl chloride multifaceted hollow spheres as carriers, and then grafts acrylic acid to modify them after oxidation by composite acids. Oxygen polar groups can improve the surface roughness, increase the specific surface area and the attachment area of ​​microorganisms, and improve the film-hanging performance of microorganisms. Combined with the adsorption and removal capabilities of zeolite, vermiculite and activated carbon for wastewater, the loofah will be carbonized and combined with zeolite , vermiculite compound, and adsorb iron and aluminum precipitation, and then after high temperature calcination, a composite powder doped with iron and aluminum oxides is obtained, which further improves the adsorption and removal ability, and at the same time, through the growth promotion effect of iron on the biofilm, the hanging film is shortened time, and finally the composite powder is adhered to the surface of the modified polyvinyl chloride multifaceted hollow sphere after being treated with polyvinyl alcohol to obtain a modified composite biological filler. The modified composite biological filler prepared by the present invention has good stability , Microbial film-hanging performance and mechanical properties are good, the specific surface area is large, the surface is rough, and the biofilm is not easy to fall off