A method for removing nitrogen and phosphorus and strengthening the removal of suspended solids

Abstract

The invention provides a method for removing nitrogen and phosphorus and strongly removing suspended matter. The method is realized by a nylon filtering net and a double-layer filtering material filtering device. The filtering device consists of a bearing layer, double filtering material layers, an aeration device, a backwashing device, a water intake system and a water drainage system. The basic operation method comprises the following steps of filling equipment with two different filtering materials; treating the to-be-treated sewage by a lower biological filtering device; removing the remaining suspended matter at high efficiency under the actions of physical trapping and biological membranes of the nylon filtering net; treating by an upper biological filtering device, so as to obtain the purified drained water. The device is used for realizing the different aeration and backwashing types. The method has the advantages that according to different requirements, the operation conditions, such as aeration time and intensity, type of filtering material, and backwashing cycle, are adjusted at any time; the richness of water treatment microbial populations in the filtering device and on the nylon filtering net is improved, and the effect of removing the suspended matter, nitrogen and phosphorus is better.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for treating domestic sewage, denitrifying and dephosphorizing the domestic sewage, and strengthening the removal of suspended solids. Background technique [0002] The input and enrichment of nutrients such as nitrogen and phosphorus are the most important reasons for the eutrophication of water bodies. Therefore, the removal of nitrogen and phosphorus from sewage is the most urgent requirement to solve the eutrophication of water bodies. [0003] Biological filtration is a kind of biological treatment of sewage. It is a water treatment method formed by combining biological treatment and filtration technology on the basis of ordinary filters and according to the principle that microorganisms can use pollutants in water to complete their own metabolism. [0004] Biological filtration avoids the disadvantages of low efficiency of physical treatment, h...

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the defects of single function of biological filtration treatment unit, frequent backwashing, difficulty in effectively removing different excessive pollutants, difficulty in adjusting special operating conditions, complex denitrification and dephosphorization process, and undeterminable operating parameters, and provides a method for improving the above-mentioned defects. A kind of nylon filter combined with double-layer filter material filter device, and provide a practical and feasible operation method

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