Composite technology for treatment of urban wastewater in complete set of physical and chemical methods

Abstract

The invention provides a composite technology for treatment of urban wastewater in a complete set of physical and chemical methods. When the urban wastewater flows into the system, large-particle impurities are basically removed through a grille, the wastewater is then rapidly mixed with a plurality of compound medical preparations and returning chemical sludge in a multi-point dosing mixer and then flows into an efficient complex coagulation-precipitation system for flocculation and precipitation, the supernate after precipitation flows into a multi-phase composite filter, and water is finally discharged after filtration, ion exchange and adsorption. The chemical sludge can be further used for processing building materials after stabilization, acidification, alkalization and chemical phosphorus recovery, thereby realizing the utilization of the sludge resource. The invention has the advantages of low requirements for the ambient temperature and flexible starting and operation. Compared with the complex process for advanced treatment with serial combination of the traditional secondary biological treatment, coagulation, precipitation and filtration, the invention shortens the overall treatment flow, and effectively reduces the infrastructure investment cost.

Description

Technical field: [0001] The patent of the invention belongs to the technical field of water treatment, and relates to a composite process technology for treating urban sewage with a complete set of physical and chemical methods. Background technique: [0002] With the rapid development of the national economy, my country's water environment is facing serious pressure and great challenges. my country has built a large number of urban sewage treatment plants, which play a key role in reducing environmental burdens, reducing pollutant discharge, and improving water environment. According to the "Statistical Bulletin on National Economic and Social Development", by 2010, more than 1,000 urban sewage treatment plants need to be built nationwide, with an additional treatment capacity of 26 million m 3 / d. But sewage treatment is an energy-intensive industry. At present, most of the existing and newly built urban sewage treatment plants in my country are biological secondary tre...

AI Technical Summary

Problems solved by technology

The traditional sewage treatment process has been difficult to adapt to today's strict discharge standards

Along the traditional technological route, only traditional "three-level treatment" systems such as coagulation and sedimentation and filtration can be added, which greatly increases the complexity of the system, construction investment and operating costs

In addition, the biochemical properties of urban sewage in my country are poor, and biological treatment methods are not widely applicable.

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