Electroplating factory wastewater treatment

< rrContact person: Manager Liu
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< r > >Zhejiang Jinhua Shenzhou Centrifuge Co., Ltd.
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< r. > >Factory address: Jinlong Road, Bailong Bridge, Wucheng District, Jinhua City, Zhejiang Province
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Wastewater treatment in electroplating factory
1. Water quality characteristics of electroplating wastewater reuse and treatment system
br>Electroplating wastewater is characterized by many types, high turbidity, high (chemical oxygen demand), and deep color. Most of them contain biodegradable petroleum, (anionic surfactants) and other pollutants.
2. Treatment method of electroplating wastewater reuse treatment system, treatment process of dosing, coagulation, sedimentation and filtration. The water quality compliance rate after treatment with this method is low and cannot meet increasingly stringent environmental protection requirements, and the treatment costs often exceed the ability of enterprises to bear.
Electrochemical plating wastewater treatment technology is a competitive wastewater treatment process developed in recent years, including electroflocculation, electrochemical oxidation, electrochemical reduction, etc.
3. Analysis of the reasons why daily electroplating wastewater does not meet the standards
br>The current wastewater treatment method generally adopts physical and chemical diversion and comprehensive two-stage treatment. The front-end treatment is divided into three categories: chromium-containing wastewater, cyanide-containing wastewater and comprehensive water (copper-nickel-zinc water). The chromium-containing wastewater is reduced with a reducing agent at a reduced price, the cyanide-containing wastewater is broken down by two-stage oxidation, and the copper-nickel-zinc water is directly combined with the first two streams to become comprehensive water. The post-processing of comprehensive water basically uses alkali (caustic soda or lime), polyaluminum chloride () and organic flocculant (). The specific operation is: raise the value of the comprehensive water. The large alkali concentration will force the alkali to combine with heavy metals. The reaction proceeds towards the formation of hydroxide. Due to the value, the discharge port must be neutralized with acid to reduce the value below. Heavy metals such as copper, nickel, and zinc all have amphoteric reducing properties, which is why chemical treatment of heavy metals cannot meet the standards.
4. Analysis of the mechanism of removing various pollution factors in the electroplating wastewater reuse treatment system
Reduction and removal of hexavalent chromium The oxidation-reduction reaction on the anode produces a large amount of ferrous ions, which have a strong reducing effect. It can reduce the hexavalent chromium r in the wastewater to r+. A reduction reaction occurs on the cathode. The r+ in the wastewater is directly reduced to r+. The electric flocculation method is simple to operate and the treatment effect is stable and can be reduced to below.
Oxidation removal and: The new ecological oxygen generated by the anode has strong oxidation ability and can oxidize organic and inorganic substances including ions in the water to achieve the purpose of removing and neutralizing the water. The chlorine ions in the waste water can generate chlorine and hypochlorite on the anode, which also has a chlorination effect on inorganic (such as) and organic matter () in the water. At the same time, active chlorine has obvious sterilization and disinfection effects.
, sulfur removal by precipitation, cyanide removal by complexation, arsenic removal by oxidation and coagulation, and fluorine and phosphorus removal by adsorption:
The ferrous ion+ dissolved from the anode can react with it to form a precipitate and be removed: ++ rrr
Under acidic aerobic conditions + can precipitate with iron blue complex [()] or [()] to form cyanide removal, with a removal rate of %. The reaction principle is expressed by the following overall reaction formula:
+++
rr[()](iron blue)r++
When the electrode plate is , the removal rate of both + and + can reach % The above may be due to the surface complexation with () after + was oxidized to + during the electrocoagulation process, and then went out after coagulation and co-precipitation.
The essence of electrocoagulation fluoride removal is to use the hydrolysis polymerization product of aluminum or iron ions formed during the electrocoagulation process to perform electrostatic adsorption, ion exchange adsorption or complex adsorption of fluoride ions in water under acidic conditions.
The removal of soluble phosphate is mainly accomplished by the adsorption of hydrolysis polymerization products of aluminum or iron ions. In addition, it may also be removed by the formation of phosphate or hydroxyphosphate precipitation.
br>To summarize: Electrochemical wastewater treatment technology integrates electrochemical oxidation, electrochemical reduction, electrochemical condensation, and electrochemical air flotation. While removing heavy metal ions, it also degrades and At present, environmental protection requires electroplating wastewater to meet the discharge standards.
We will wholeheartedly provide users with a full range of high-quality services and can design and manufacture products with special specifications and special requirements as well as water treatment solution consultation according to user requirements. Users are welcome to come to negotiate and look forward to cooperating with you! Our company promises: three guarantees of quality for all factory products, one-year warranty and lifelong maintenance. Manager Liu of Jinhua Shenzhou Centrifuge Co., Ltd.