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Analysis Of Basic Process Flow Of Electroplating Waster Water Treatment

Analysis of Basic Process Flow of Electroplating Waster Water Treatment

Electroplating is the use of chemical and electrochemical methods in the metal or other materials in the surface coated with a variety of metals. Electroplating technology is widely used in machine manufacturing, light industry, electronics and other industries. Electroplating wastewater composition is very complex, Waster Water Treatment in addition to cyanide (CN-) wastewater and acid-base waste water, the heavy metal wastewater is the electroplating industry potentially hazardous waste water category. According to the classification of heavy metal elements contained in heavy metal wastewater, it can be divided into waste water containing chromium (Cr), nickel (Ni), cadmium (Cd), copper (Cu) Gold (Au) wastewater, silver (Ag) wastewater.

Electroplating Waster Water Treatment at home and abroad generally attention, developed a variety of governance techniques, through the toxic treatment for non-toxic, harmful into harmless, recycling precious metals, water recycling and other measures to eliminate and reduce heavy metal emissions. With the rapid development of electroplating industry and the increasing demand for environmental protection, electroplating Waster Water Treatment has begun to enter the clean production process, total control and recycling economy integration stage, resource recycling and closed loop is the mainstream direction of development.

Electroplating is the use of chemical and electrochemical methods in the metal or other materials in the surface coated with a variety of metals. Waster Water Treatment Electroplating technology is widely used in machine manufacturing, light industry, electronics and other industries. Electroplating wastewater is more complex, electroplating wastewater containing chromium, zinc, copper, nickel, cadmium and other heavy metal ions and acid, alkali, cyanide and other substances with great toxicity. Electroplating wastewater composition is complex, pollutants can be divided into two major categories of inorganic pollutants and organic pollutants, water quality change range, the production of various types of wastewater pollutant species diversity, CODcr coefficient of change; Waster Water Treatment and electroplating wastewater toxicity, containing a lot of heavy metals Ions, if not treated directly to the surrounding water will cause great pollution.

For my country's current electroplating industry Waster Water Treatment status quo statistics and surveys, widely used electroplating Waster Water Treatment methods are mainly seven categories:

(1) chemical precipitation method, and is divided into neutralization and sulfide precipitation method.

(2) oxidation and reduction treatment, divided into chemical reduction method, ferrite method and electrolysis.

(3) solvent extraction separation method.

(4) Adsorption method.

(5) membrane separation technology.

(6) ion exchange method.

(7) biological treatment technology, including bioflocculation, biosorption, biochemical methods, phytoremediation.

1, electroplating heavy metal Waster Water Treatment technology status quo

The traditional electroplating Waster Water Treatment methods are: chemical method, ion exchange method, electrolysis and so on. However, the traditional method of dealing with electroplating wastewater has the following problems:

(1) the cost is too high - water can not be recycled, water and sewage treatment costs accounted for 15% of the total production costs to 20%;

(2) waste of resources - precious metals discharged into the water, can not be recycled;

(3) environmental pollution - electroplating wastewater in the heavy metals as "permanent pollutants" in the biological chain in the transfer and accumulation, and ultimately endanger human health.

The typical process of electroplating wastewater by membrane technology is as follows:

Using membrane technology for electroplating Waster Water Treatment to provide the perfect solution to promote the electroplating industry technology upgrades. Its main features:

(1) reduce costs - water and precious metals recycling, reduce material consumption

(2) recycling of resources - precious metals recycling

(3) to protect the environment - zero discharge of waste water or micro-emissions

Electroplating production process of high water consumption and emissions of heavy metals on the water environment pollution, greatly hampered the sustainable development of the electroplating industry. The cost of the traditional electroplating Waster Water Treatment process is too high, Waster Water Treatment heavy metal is not recycled to the water body, easy to cause harm to the biological. The membrane separation technology for water and heavy metal recycling, through the membrane separation technology to deal with the electroplating wastewater, can achieve heavy metal "zero emissions" or "micro-emissions", so that production costs greatly reduced.

The use of membrane separation technology, from the electroplating wastewater recovery of heavy metals and water resources to reduce or eliminate its pollution to the environment, to achieve clean production of electroplating, higher value-added gold, silver, nickel, copper and other electroplating wastewater separation Technology can achieve closed-circuit, and produce good economic benefits. For the integrated electroplating wastewater, after a simple physical and chemical treatment, the use of membrane separation technology can reuse most of the water, Waster Water Treatment the recovery rate of up to 60% to 80%, reduce the total discharge of sewage, reduce emissions to the water pollutants.

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