A kind of advanced treatment method of urban sewage

Abstract

The invention discloses a deep treatment method for urban sewage. The method comprises the following steps: step one: performing impurity removal through a grating, sand setting, primary sedimentation, biological treatment and secondary sedimentation on sewage, so as to enable the sewage to be preliminarily separated from sludge; second two: treating the sewage treated in the first step through a physical, chemical or biological method, performing disinfection and sterilization to meet the discharging index, and discharging the sewage; step three: performing physical wall breaking on the sludge treated in the first step through grinding, then performing chemical wall breaking and deodorization through a chemical reagent, finally performing pressure filtration dehydration, so as to enable the sludge to be discharged after pressure filtration, and water subjected to recycling and pressure filtration is recycled and treated through the second step. By adopting the deep treatment method, deodorization and sterilization can be effectively achieved, the water content in the sludge is greatly reduced, and the operation cost is low.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for advanced treatment of urban sewage. Background technique [0002] Municipal sewage is all drainage collected through the sewer system, and it is the mixed water of various domestic sewage, industrial wastewater and urban rainfall runoff discharged into the sewer system. Domestic sewage is the water discharged in people's daily life. The water quality of this type of sewage is characterized by high organic matter, such as starch, protein, oil, etc., as well as inorganic matter such as nitrogen, phosphorus, etc. In addition, it also contains pathogenic microorganisms and more of suspended matter. Compared with industrial wastewater, the water quality of domestic sewage is generally more stable and the concentration is lower. Industrial wastewater is the wastewater discharged during the production process, including production process wastewater, circulating ...

AI Technical Summary

Problems solved by technology

High-temperature drying technology produces harmful waste gas such as dioxin during the sludge treatment process, causing secondary pollution to the environment

Using mechanical and ultrasonic technology to break the cell wall, in addition to the large investment in equipment, it also consumes a lot of power during operation

Therefore, the operating cost is high

Using a strong oxidizing agent to break the sludge cell wall, due to the high concentration of sludge with a water content of 80%, it is difficult to fully integrate the agent, the amount of addition is large, and the cost is also high

Due to the addition of chemical agents, it may bring unfavorable factors to the subsequent treatment of sludge

[0008] Therefore, there is an urgent need to provide a new treatment method for urban sewage to solve the technical problems of long sludge deodorization time and difficult dehydration reduction during the existing urban sewage treatment.

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