A heavy metal sewage treatment system

Abstract

The invention discloses a heavy metal sewage treatment system which comprises a first reduction tank, a second reduction tank and a filtering tank, wherein the first reduction tank, the second reduction tank and the filtering tank are sequentially arranged; a water inlet of the first reduction tank is connected with a sewage source, a water outlet of the first reduction tank is connected with a water inlet of the second reduction tank, a water outlet of the second reduction tank is connected with a water inlet of the filtering tank, a water draining opening is formed in the bottom of the filtering tank, the first reduction tank is provided with a heavy metal electrolyzing device, the second reduction tank is provided with an iron electrolyzing device, and the heavy metal electrolyzing device and the iron electrolyzing device are respectively connected with an electric control device. The heavy metal sewage treatment system disclosed by the invention is suitable for all kinds of heavy metal wastewater treatment of mineral separation, smelting, chemical engineering, electroplating and the like and further can make harmful components of the wastewater be oxidized, reduced, air floated, decolored, deodorized and sterilized in an electrolyzing process and be well degraded in a flocculating process; a recovery rate is larger than 95%; recovered wastewater then is subjected to strongoxidation and reduction electrochemical device to ensure that wastewater treatment can stably reach a standard; thus, higher economical benefits and environmental benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a heavy metal sewage treatment system. Background technique [0002] With the development of my country's industrial technology, it has also brought environmental problems, especially the natural resources that human beings rely on - water. At present, more and more pollutants enter the water environment. Environmental and human health pose many problems. Among them, heavy metal pollution is different from pollution of other organic compounds: many organic compounds can be purified physically, chemically or biologically in nature to reduce or eliminate the harmfulness; while heavy metals are enriched and difficult to degrade in the environment. Cd, Cr, Co, Hg, Ce, Mn, Ni, Pb, Zn, etc. are all heavy metals that can pollute water bodies. [0003] The sources of heavy metal pollution in water mainly include the following aspects: First, the discharge of industrial pollutio...

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Problems solved by technology

The second is the pollution of waste batteries. Waste batteries contain a large amount of harmful heavy metals such as Hg, Cd, Pb, Cr, Ni, Mn, which leak into the environment, causing great pollution and harm.

The third is urbanization construction. Damaged high-pressure mercury lamps, neon lights, fluorescent tubes, etc. have not been properly disposed of, and have become a major source of heavy metal pollution; waste batteries and battery fluids in the auto repair industry have caused serious lead pollution; Although the use of gasoline has been discontinued, the pollution hazard of lead to the environment still has a rather long lag effect

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