A method for reducing total phosphorus content in sewage

Abstract

The invention discloses a method for reducing the total phosphorus content in sewage, which adopts a contact oxidation treatment process, and further includes the following treatment steps: preparing an aluminum sulfate aqueous solution with a mass concentration of 5-70 g / L as a phosphorus removal agent 1; The aqueous solution of polyaluminum sulfate with a concentration of 25-50 g / L is used as the phosphorus removal agent 2; the prepared phosphorus removal agent 1 is added to the water at the outlet of the contact oxidation tank, and stirred by the aeration of the contact oxidation tank to make the aluminum ions and the water Phosphate root reacts: add phosphorus removal agent 2 at the outlet of the contact oxidation tank or at the inlet of the sedimentation tank. The method of the invention has the characteristics of simple operation, less dosing, low cost, and no other pollution; the method of the invention improves the treatment process of the contact oxidation method, so that the removal rate of total phosphorus in sewage increases from 2.40% to 99.47% %, has a good treatment effect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to a method for reducing the total phosphorus content in sewage. Background technique [0002] As of the end of June 2013, a total of 3,479 urban sewage treatment plants have been built in cities and counties across the country, with a sewage treatment capacity of 145.47 million m 3 / sky. But at the same time, there are still many enterprises whose sewage treatment stations directly enter the rivers, lakes and seas, causing serious water pollution; phosphorus is one of the main culprits of water pollution, if excessive phosphorus is contained in sewage, it will cause algae and other planktonic The rapid reproduction of organisms reduces the dissolved oxygen in the water body and deteriorates the water quality; with the introduction of the new environmental protection law and the increasingly severe environmental situation, if the sewage treatment plant cannot control the tota...

AI Technical Summary

Problems solved by technology

However, these existing phosphorus removal methods still have certain defects, such as the traditional biological method that is most widely used in sewage treatment plants (stations), although it has the advantages of simple operation and low price, its effect on phosphorus The removal effect is not good, and it is sensitive to changes in process conditions. At the same time, once the sludge in the biological method is in an anaerobic state, phosphorus will also be released; the constructed wetland occupies too large an area, and the effect is not easy to show. Moreover, the local climate and environment have a great influence on the plants in the constructed wetland, making the constructed wetland unable to stably exert the phosphorus removal effect

[0004] In view of this, the chemical method is of great help to the upgrading and transformation of sewage treatment plants (stations) or treatment plants (stations) with high treatment requirements; however, the current chemical method has a large dosage and poor effect question

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