A kind of dephosphorization flocculant for urban sewage treatment and its preparation method and application

Abstract

The invention discloses a dephosphorization flocculant for urban sewage treatment and its preparation method and application, comprising 40-80 parts of ferric sulfate, 20-40 parts of chitosan, 15-30 parts of sodium silicate, and 25-35 parts of ferrous sulfate. 24-36 parts of manganese dioxide, 14-26 parts of iron oxide, 13-25 parts of hydrochloric acid solution, 14-18 parts of initiator, and 15-19 parts of coagulation aid. The invention also discloses a preparation method based on the dephosphorization flocculant for urban sewage treatment. It solves the problem of low-concentration phosphorus-containing urban sewage treatment and makes up for the deficiency of existing phosphorus-removing flocculants. The product has good stability, small dosage, fast flocculation speed, good flocculation effect, short settling time, high treatment efficiency and wide application range. , The amount of sludge produced is small, and it can simultaneously remove phosphorus and dephosphorization, and has the advantages of low treatment cost and simple process.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a dephosphorization flocculant for urban sewage treatment and a preparation method and application thereof. Background technique [0002] With the development of the city, the discharge of urban sewage has reached the point where it cannot be controlled. In particular, phosphorus in sewage mainly comes from urban sewage such as detergents, feces and phosphating, and its forms include orthophosphate, polyphosphate and organic phosphorus, of which orthophosphate and polyphosphate account for the vast majority. There is mutual conversion between organic phosphorus and inorganic phosphorus, soluble phosphorus and insoluble phosphorus, but the valence state does not change. It is generally used to purify the water, remove or reduce the phosphorus content, and then continue to reuse the clear liquid. The result of this treatment method is good or not, in fact, it mainly depe...

AI Technical Summary

Problems solved by technology

The stability of biological phosphorus removal is poor, and the removal rate of phosphorus is not high. General biological phosphorus removal can only remove about 30% to 40% of phosphorus, and it is difficult to completely remove pollutants such as phosphate

Chemical phosphorus removal requires a large amount of chemicals, high cost, and produces a large amount of chemical sludge. The treatment effect on low-concentration phosphorus-containing urban sewage is poor. The treated urban sewage still needs to be combined with other processes to further treat urban sewage before it can meet the discharge standard.