Treatment method for complex metal wastewater

A technology for complex metal wastewater and a treatment method, which is applied in the field of complex metal wastewater treatment, can solve the problems of biochemical system influence, poor biodegradability, and excessive hardness, and achieves the effect of reducing costs

Inactive Publication Date: 2015-09-23
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The biodegradability of organic matter is poor, but it is difficult to achieve high-efficiency biodegradability through oxidation
[0007] The complexity of complexed heavy metals can only remove organic complexed heavy metals by adding oxidants, and the removal of some inorganic complexed heavy metals is poo

Method used

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  • Treatment method for complex metal wastewater

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Embodiment 1

[0033] Sewage is selected from a sewage plant electroplating wastewater physicochemical precipitation effluent. The heavy metal in the water quality is mainly complex copper. The indicators of the water plant are as follows: COD 476.87mg / L, copper 6.42mg / L, ammonia nitrogen 57.32mg / L.

[0034] Such as figure 1 As shown, the process of treating the electroplating wastewater physical and chemical precipitation effluent is as follows:

[0035] 1. Adjust the pH value of the precipitated water after coagulation and sedimentation pretreatment to 2.5, add ferrous sulfate heptahydrate to 3.055g / L, and add 30% hydrogen peroxide to 1.94ml / L for Fenton Reaction (Fenton), the reaction time is 120 minutes, and the measured COD in the water is 195mg / L, copper 0.26mg / L, ammonia nitrogen 78.54mg / L, in which ferrous sulfate heptahydrate is used as a catalyst, and hydrogen peroxide is used as an oxidant to make Fast and efficient Fenton reaction;

[0036] 2. Adjust the pH of the effluent to 8...

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Abstract

The invention provides a treatment method for complex metal wastewater. The treatment method comprises the following steps of: enabling the complex metal wastewater to flow into an acid regulating tank after carrying out coagulating sedimentation pretreatment so as to regulate pH of the complex metal wastewater to be acidic; introducing the wastewater into a Fenton reaction tank, adding ferrous sulfate and then adding hydrogen peroxide; introducing the reacted wastewater into an alkali regulating tank, adding alkali to regulate the pH of the reacted wastewater to be basic, and introducing the basic wastewater into a sedimentation tank; and introducing liquid supernatant which passes through the sedimentation tank into an ozone active carbon reaction tank, adding active carbon into filtered water, introducing ozone, and enabling reaction outlet water to finally enter a biological reaction tank through the regulating tank to carry out biological treatment. The process can effectively degrade complex formed by zinc, copper, arsenic, nickel, lead, a complexing agent EDTA, citric acid, tartaric acid, ammonium, cyanogens, ethidene diamine and oxalic acid to remove organic complex metal and inorganic complex metals in the complex , and further can recycle part of the heavy metals; and the active carbon which is used as an adsorbent can be recycled, so that the cost of the whole process is reduced.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, more specifically, to a treatment method for complex metal wastewater. Background technique [0002] Heavy metal pollution has seriously threatened human health. When human beings are exposed to high concentrations of heavy metals (such as copper), severe skin diseases will appear. If it exceeds 15mg / L, it will produce peculiar smell. What's more serious is that when the water polluted by heavy metals is used to irrigate farmland, it will accumulate in crops and affect human health after human consumption. In Changtun, Sanhe Village, Wushan Township, Daxin County, Guangxi, due to pollution from the heavy metal cadmium, villagers suffered from arm deformities and other symptoms. [0003] The difficulty in the treatment of heavy metals lies in the complexation of heavy metals, which mainly exist in circuit boards and electroplating wastewater. Heavy metals (such as Cu, Ni, etc.) und...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 刘伟邵云海张同舟
Owner SUN YAT SEN UNIV
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