High-efficiency dephosphorization agent used for sewage treatment

Abstract

The invention discloses a high-efficiency dephosphorization agent used for sewage treatment. The dephosphorization agent is characterized by being prepared from the following components, in percentages by mass: 30-50% of anhydrous ferrous sulfate, 8-20% of an aluminum salt, 1-10% of anhydrous ferric chloride, 0.01-0.5% of anhydrous copper sulfate, 0.01% of polydimethyldiallylammonium chloride, andthe balance of a coagulant and water. In practical use of the dephosphorization agent provided by the invention, metal ions in the dephosphorization agent are rapidly combined with phosphate radicalsto form a water-insoluble precipitate, the flocculent precipitate is formed through mutual contact under the action of a flow speed gradient or a mixed diffusion process, if phosphorus exists in thesewage in the form of a polyphosphate, the phosphate radicals in the polyphosphate react with the metal ions to form the precipitate, and the formed precipitate is flocculent, so that the precipitatecan adsorb the polyphosphate to remove a part of the phosphorus; and the polyaluminum chloride and the coagulant can effectively remove phosphorus through coagulating sedimentation.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a high-efficiency phosphorus removal agent for sewage treatment. Background technique [0002] In recent years, with the development of industry and agriculture and the growth of population, the production and consumption of chemical fertilizers, pesticides, and phosphorus-containing detergents in China have increased rapidly, and the eutrophication of water bodies caused by water pollution has become increasingly serious. Agriculture, fishery, tourism and many other industries also pose a huge threat to drinking water sanitation and food safety. The main nutrients that cause water eutrophication include organic carbon, nitrogen, phosphorus, potassium, etc. The organic carbon in sewage is generally processed. It can be basically removed after biological treatment, and the content of other components except nitrogen and phosphorus is extremely low relative to the demand in the proce...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problems in the prior art that currently the agents used for chemically assisted phosphorus removal from sewage can be mainly divided into aluminum salts, iron salts, calcium salts, natural adsorbents and flocculants, etc. It is poor, and it is easy to cause new pollution, and the scope of application is narrow. Although the natural adsorbent has a huge specific surface area, if it is not modified, it can only remove phosphorus through physical adsorption, and the effect is poor. It usually plays an auxiliary role in the process, and when these phosphorus removal agents are used alone, the pH range of the sewage is narrow. To provide a high-efficiency phosphorus removal agent for sewage treatment, it is applied by changing the traditional phosphorus removal agent. The active ingredient formula, using the copper sulfate and other ingredients contained in it, has a complex reaction with organic phosphorus to remove most of the phosphorus-containing substances in the sewage, and has a good effect on the sewage produced by different industries, so its treatment range wider