Heavy metal sewage treatment system

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a heavy metal sewage treatment system. The heavy metal sewage treatment system comprises a regulation andcontrol auxiliary system, a primary treatment unit, a secondary treatment unit and an effluent safety guarantee unit, and the primary treatment unit, the secondary treatment unit and the effluent safety guarantee unit are connected in sequence. Meanwhile, the invention also provides a method for treating heavy metal sewage by adopting the system. By utilizing the system and the process, the characteristics and advantages of reagents can be fully exerted; the problem that different heavy metals need different precipitation pH values is solved, the process is concise and clear, a new structure is not needed, removal of other pollutants is not affected, the matching degree with a built sewage treatment process is high, dosing control in the process and method is automatically controlled in aPLC mode, and the comprehensive operation cost is effectively reduced.

Description

Technical field: [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a heavy metal sewage treatment system. Background technique: [0002] With the rapid development of industries such as electroplating, chemical industry, metal pickling, metallurgy and electronics, industrial wastewater with high concentrations of heavy metals will be produced during production. After the enterprise adopts necessary pollution control facilities, the content of different heavy metals in wastewater can be significantly reduced to the discharge standard of 0.05-5.0 mg / L, but the concentration of heavy metals is still higher than the acceptance limit of municipal sewage treatment plants. Heavy metals are already a part of municipal sewage. important and common pollutants. At the same time, the lack of advanced industrial wastewater treatment technology, illegal discharge and sudden heavy metal pollution accidents directly lead to the heavy meta...

AI Technical Summary

Problems solved by technology

In view of the fact that the residual heavy metals discharged from the factory into the municipal sewage plant exist in suspended, free and complex states at the same time, different methods or water treatment chemicals are required to remove heavy metals in different forms, which increases the difficulty of operation; on the other hand, the existing water treatment chemicals In order to achieve the discharge of heavy metals in industrial wastewater, it is often necessary to overdosing, but excessive dosing in municipal sewage will lead to the collapse of the biochemical system on the one hand, and on the other hand, the residual chemicals in the factory water will increase biological toxicity and endanger environmental health; at the same time, urban sewage plants in my country It has covered the whole country, and the sewage plant is limited by space and operating cost control. It does not have the ability to build additional structures to treat heavy metals and cannot use high-cost treatment methods such as electrochemistry and reverse osmosis membranes.

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