A kind of polyaluminum-zinc composite flocculant and its application

Abstract

The invention discloses an aluminum-zinc polysilicate composite flocculating agent and application thereof. Sodium silicate solution and excessive sulfuric acid are mixed with each other to prepare polysilicate solution, zinc sulfate and aluminum sulfate solution, polyacrylamide, calcium hydroxide and sodium hypochlorite are sequentially added into the polysilicate solution, and reaction is carried out to obtain the aluminum-zinc polysilicate composite flocculating agent. The aluminum-zinc polysilicate composite flocculating agent and the application have the advantages that the aluminum-zinc polysilicate composite flocculating agent can be applied to the field of water treatment, accordingly, excellent effects of removing colors, turbidity and carbon can be realized, coagulated floc particles are large, the aluminum-zinc polysilicate composite flocculating agent is high in floc settling velocity, excellent net capturing effects can be realized, and the excellent effects of removing the colors and the turbidity can be realized; raw materials for the aluminum-zinc polysilicate composite flocculating agent can come from wide sources, the aluminum-zinc polysilicate composite flocculating agent is easy to prepare and can be widely applied to the field of wastewater from dyeing and printing and papermaking industries and the like and the field of advanced municipal sewage treatment, and the like.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a polyaluminum-zinc composite flocculant and its application. Background technique [0002] With the rapid development of my country's economy and the acceleration of urbanization, the discharge of urban sewage and industrial wastewater has increased year by year. How to deal with these wastewater has become a major problem in urban construction. Flocculation is a commonly used wastewater treatment method, which occupies an important position in water treatment. In recent years, flocculation technology has developed rapidly in recent years, and more and more types of flocculants have been developed. Flocculants can be divided into organic flocculation agent, inorganic flocculant and microbial flocculant. Traditional inorganic flocculants are difficult to control the formation of hydrolysis products, while inorganic polymer flocculants can control the flocculation chemistry, a...

AI Technical Summary

Problems solved by technology

The invention patent with the publication number CN104478051A discloses a preparation method of a polyaluminum iron silicate flocculant, which uses tetraethyl orthosilicate as a silicon source, first reacts with boiling water to form polysilicic acid, and then reacts with aluminum salt and iron Salt is mixed to prepare polyaluminum silicate iron flocculant. This invention uses boiling water to prepare polysilicic acid. The preparation process is complicated, the cost is high, and it is difficult to popularize. Moreover, after excessive iron salt is added, the decolorization effect of the flocculant will be greatly reduced; Publication No. The invention patent of CN104445236A discloses a polymeric aluminum zinc silicate flocculant and its preparation method and application. In this invention, a crosslinking agent is added to the silicate solution to adjust the pH to obtain a polysilicate solution, and then sequentially added to the solution Aluminum salt and zinc salt are used to prepare polyaluminum-zinc polysilicate flocculants. In this invention, an external cross-linking agent is required, and the dosage is relatively large, and the pH adjustment requires precision. The preparation cost is high and the process is complicated.

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