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Heavy metals refer to metals with a specific gravity greater than 4 or 5, and there are about 45 types. The usual heavy metal pollution mainly refers to the environmental pollution of mercury, lead, cadmium, chromium and arsenic with significant biological toxicity. It also includes heavy metals with certain toxicity such as Zinc, copper, cobalt, nickel, tin, vanadium, etc. Heavy metal wastewater is produced in many production processes in mining and metallurgy, machinery manufacturing, chemical industry, electronics, instrumentation and other industries. Heavy metal pollutants are difficult to treat and become a major environmental problem related to human health and life. In order to make the heavy metals contained in sewage meet the water quality requirements of a certain water body for drainage or reuse, it needs to be purified.
