Biochar/polyvinyl formal porous composite filler, and preparation method and application thereof

Abstract

The invention provides a biochar / polyvinyl formal porous composite filler, and a preparation method and application thereof. The biochar / polyvinyl formal porous composite filler has the advantages that foamed mixed liquid is obtained by adding foaming agents, surfactants, biochar powder, a formaldehyde solution and a sulfuric acid solution into an aqueous solution of polyvinyl alcohol and continuously stirring the aqueous solution, the biochar / polyvinyl formal porous composite filler is obtained through in-situ synthesis based on aldolization reaction after heating, and the composite filler prepared by the process has a coarse surface, a large specific area, high hydrophilic and biological affinity, and the advantages that traditional fillers can't match in water treatment application.

Description

(1) Technical field [0001] The invention relates to the field of water treatment fillers and porous composite materials, in particular to a biochar-polyvinyl formal porous composite filler, a preparation method thereof, and an application in water treatment. (2) Background technology [0002] At present, the effluent water quality standard of most urban sewage treatment plants in my country is not high, and most of them implement the first-class A effluent standard. High, the effluent still contains more pollutants, which will cause eutrophication of the water after entering the water body and have a certain impact on the environment. Under the general background of "five waters co-governance", it is urgent to upgrade the sewage treatment plant. By putting natural or artificial fillers into the biochemical reaction tank, microorganisms will attach, reproduce and grow on the surface of the fillers, forming a layer of purification. Biofilm maintains a large biomass in the reac...

AI Technical Summary

Problems solved by technology

The cost of fixed packing is high, and the requirements for the uniformity of water distribution and air distribution are very high, and it is easy to cause difficulty in removing the film, which will cause clogging. Once clogged, its treatment efficiency will drop sharply, and even damage the structure.

During the operation of the hanging packing, the packing wires will clump together, which greatly reduces the actual specific surface area used, and is prone to broken wires and central rope breaks, which affects the service life. The service life is generally 1-2 years

The specific gravity of the suspended filler is close to that of water, the volume of the monomer is small, and there is no need for a fixed support. It can be suspended in the water with aeration and stirring in the pool and is in a fluidized state. The energy consumption is low, and it is fully in contact with water and air in the fluidized state. , can promote the aging biofilm to fall off automatically and form a new film, but the specific surface area is small, the amount of film formation is small, and the surface is smooth and difficult to form a film

[0004] The performance of the filler directly determines the removal rate of pollutants. Traditional fillers have more or less problems such as small specific surface area, difficulty in film formation, relatively small biomass and easy biofilm fall off, and low treatment efficiency.

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