Heavy metal wastewater treatment system and method

Abstract

The invention discloses a heavy metal wastewater treatment system. The system comprises a pH regulation tank, a coagulation tank, a flocculation tank, a sedimentation tank, a pH back regulation tank,a middle pool, a multimedia filter, an ultrafiltration system, a first concentrated water tank, a reverse osmosis system and a reuse water tank which are sequentially connected; the system also comprises a first pretreatment system and a second pretreatment system; the first pretreatment system comprises a first oil separator and a first regulation tank; the second pretreatment system comprises asecond oil separator, a second regulation tank and a microelectrolysis tower. The invention also discloses a heavy metal wastewater treatment method. The system can perform centralized treatment on pretreatment wastewater and posttreatment wastewater produced in the circuit board production process, effectively remove suspended solids, COD and heavy metals in the wastewater and realize water reuseand has the characteristics of good heavy metal removal effect and high treatment efficiency.

Description

technical field [0001] The invention relates to a wastewater treatment system, in particular to a heavy metal wastewater treatment system and method. Background technique [0002] Heavy metal wastewater refers to wastewater containing heavy metals discharged from industrial production processes such as mining and metallurgy, machinery manufacturing, chemical industry, electronics, and instrumentation. For example, in the process of circuit board production, the wastewater mainly contains copper, chromium, nickel, zinc, acid and alkali and other polluting components. If the above wastewater is not effectively treated, it will cause serious pollution to the environment. When natural water bodies are polluted by acid, alkali, and heavy metals, the buffering effect of the water body is destroyed, which deteriorates the water quality, inhibits or prevents microbial activities, reduces the self-purification ability of water, and also causes harm to crops. Heavy metal ions have a ...

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Problems solved by technology

If the above wastewater is not effectively treated, it will cause serious pollution to the environment.

When natural water bodies are polluted by acid, alkali, and heavy metals, the buffering effect of the water body is destroyed, which deteriorates the water quality, inhibits or prevents microbial activities, reduces the self-purification ability of water, and also causes harm to crops. Heavy metal ions have a great impact on human health. Harmful, and heavy metal ions in water will not be degraded by microorganisms, they can be adsorbed, accumulated and enriched in organisms, which is extremely harmful to humans, fish, and plankton, and may cause crop production reduction or livestock death in severe cases

At present, the heavy metal wastewater in the circuit board production process is mainly copper ions and a small amount of nickel ions. Because pre-treatment wastewater and post-treatment wastewater are generated in the production process, separate treatment methods are generally used in the prior art. The complexing agent will be added, and the complexing agent forms a very stable complex with copper ions and other heavy metal ions. It is difficult to treat the wastewater to meet the discharge standard by using the general flocculation precipitation method.

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