Reclaimed Water system：
The source of electroplating wastewater is: (1) plating cleaning water; (2) waste electroplating bath; (3) other wastewater, including scouring workshop ground, scrubbing pad wash water, condensed water, ventilation, and due to the plating tank leakage or improper operation management of "run, run, drip, leak" various bath and drainage; (4) the cooling water of the equipment is not polluted unless the temperature is raised during the use of the cooling water. The water quality of electroplating wastewater is related to the technological conditions of electroplating production, production load, operation management and water usage. Complicated water quality of electroplating wastewater, composition is not easy to control, containing chromium, cadmium, nickel, copper, zinc, gold, silver and other heavy metal ions and cyanide, etc., some belong to the carcinogenic, teratogenic and mutagenic toxic substances.
The source of electroplating wastewater is generally:
(1) wash water for plating;
(2) waste electroplating bath;
(3) other wastewater, including scouring workshop ground, scrubbing pad wash water, condensed water, ventilation, and due to the plating tank leakage or improper operation management of "run, run, drip, leak" various bath and drainage;
(4) the cooling water of the equipment is not polluted unless the temperature is raised during the use of the cooling water.
(5) metal surface treatment: metal surface
Characteristic of Wastewater
For metal matrix materials, the electroplating can be divided into:
1. (including polishing, polishing, sand blasting, rolling, brushing, etc.)
2. (including oil removal, rust removal and erosion, etc.)
3. Electrochemical treatment (including electrochemical deoil and electrochemical erosion, etc.)
Alkaline compound is commonly used in degreasing process, such as NaOH, Na2CO3, Na3PO4, Na2SiO3, sometimes also used for oil pollution especially serious parts of kerosene, gasoline, acetone, toluene, trichloroethylene, carbon tetrachloride and other organic solvent degreasing, chemical alkaline degreasing again. In order to remove certain mineral oil, a certain amount of emulsifier, such as OP emulsifier, AE emulsifier and triethanolamine oleic soap, is usually added to the oil. Therefore, the waste water produced in the oil removal process and the replacement of waste liquid are alkaline effluents, which often contain oil and other organic compounds.
It is commonly used in acid cleaning and rust removal to prevent corrosion of the substrate, and it is often added to some corrosion inhibitors such as thiourea, sulfonated coal tar, and ulotto benzidine. The cleaning water produced by the process of pickling and rust removal is generally high and contains heavy metal ions and a small amount of organic additives.
Wastewater treatment is an important part of electroplating wastewater treatment, accounts for about 50% of the total electroplating waste water, waste water containing a certain amount of salt, free acid, organic compound, such as composition changed, along with the process before plating, and factory management level, etc.
Electroplating wastewater treatment
The current general use of physicochemical treatment.
The processing method is more, effective also many, but can achieve the overall standard not much.
But to do good is also some, such as, shaanxi f tianbao company DTCR - heavy metal ion trap agent, heavy metal ions in waste water by DTCR and form a kind of macromolecular chelate, then after flocculation, can well remove the heavy metal ions in the electroplating wastewater, and reach the national standard.
The main source of zinc in electroplating and metal-processing wastewater is the electroplating or acid - cleaning mop.
The pollutants are then washed away through the process of metal rinse.
The pickling process involves soaking the metal (zinc or copper) first in a strong acid to remove the surface oxide, and then immersing it in a bright agent containing the strong chromic acid.
The waste water containing large amounts of hydrochloric acid and zinc, copper and other heavy metal ions and organic brightener, etc, and toxicity is bigger, some also contain carcinogenic, teratogenic and mutagenic toxic substances, great harm to human beings.
Therefore, the electroplating wastewater must be seriously recycled to eliminate or reduce its pollution to the environment.
Electroplating wastewater treatment equipment by adjusting pool, add medicine cabinet, reduction, neutralization reaction pool, pool pH adjustment pool, flocculation pool, inclined tube sedimentation tank, box filter press, clear water reserviors, air flotation, activated carbon filter, etc.
There are several main ways.
1. Air flotation
Air flotation is bubbled into the air to the water, tiny air bubbles, due to the adhesion between bubble and fine suspended solids, flotation will form, using the bubbles rise, rise to the surface, the formation of bubbles or scum, hence leading to the separation of suspended material in the water.
According to the different ways of bubbles, it can be divided into three types: aeration gas float, dissolved gas float and electric degassing.
The air float method is a new solid-liquid separation method for the precipitation method. In 1978, Shanghai tongji university first applied the air flotation method to treat the treatment of heavy metal wastewater.
Subsequently, due to the continuous process of processing, the equipment is compact, the space is small, easy to automate and has been widely used.
It is adaptable to the separation technology of air float and solid liquid, which can be used to treat chrome-plated wastewater, chromium-containing passivation wastewater and mixed wastewater.
Not only can remove the heavy metal hydroxide, but also can remove other suspension, emulsified oil, surfactant etc.
Air flotation is used for chromium plating wastewater treatment principle is: under the condition of acid ferrous sulfate and hexavalent chromium for REDOX reaction, and then in alkaline conditions to produce flocculation body, under the effect of the micro bubbles make the flocculation body surface, make the water clear.
2. Ion exchange method
Ion exchange method is mainly used to exchange ions in ion exchange resin to exchange some ions in electroplating wastewater to remove it and purify the wastewater.
Domestic electroplating wastewater treatment with ion exchange technology starts, test and research in the 1960 s to 70 s, because of an urgent need to solve the problem of environmental pollution, this technology got great development, has become a current electroplating wastewater treatment and recycling, one of the effective means of certain metals is also make certain kinds of plating electroplating effluent achieve closed-circuit circulation is an important link.
But by ion exchange method of the investment cost is very high, the system design and operation management is relatively complex, generally of small and medium enterprises difficult to adapt, often due to improper maintenance, management and so on and can not reach the desired effect, therefore, is limited by some on the popularization and application.
At present, ion-exchange treatment is more common in electroplating wastewater containing chromium and nickel, and has more mature experience in design, operation and management.
After treatment, the water can meet the emission standard, and the water quality is better, and can be used for recycling.
After the resin exchange adsorption saturation, the regenerative eluting solution can be used for plating bath after adjustment and purification of electroplating technology, and the closed-loop cycle is basically realized.
In addition, ion exchange method can also be used to treat wastewater containing copper, zinc and gold.
3. The electrolytic process
The electrolysis process mainly causes the harmful substances in the wastewater to be oxidized and reduced to harmless substances through the electrolytic process.
Or use electrode oxidation and reduction products to react with harmful substances in waste water, generate sediment that is insoluble in water, and then separate or remove the metal through electrolytic reaction.
Domestic began in the 1960 s by electrolysis treatment electroplating wastewater containing chromium, in the late 70 s the experimental study on the wastewater containing silver, copper, etc, the recovery of silver, copper and other metals, has obtained the good effect.
Electrolysis treatment of electroplating wastewater is commonly used in medium and small factory, its main characteristic is without adding the reagent, the process is simple, easy to operate, less of production area, at the same time due to the recovery of high purity metal, used for recovery of precious metals have very good economic benefits.
However, when the water volume is larger, the power consumption of the electrolysis method is larger, and the amount of iron plate consumed is larger, and the separation of sludge and chemical treatment is not easy to dispose of, so it is less used.
4. The extraction method
Extraction method is to use a kind of insoluble in water and can dissolve in water a substance (called a solute or extract) of solvent in wastewater, the solute dissolves in the solvent, thereby to remove or reclaim a substance in waste water from the method.
The extraction operation consists of three main processes: mixing, separating and recovering.
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Company: Wuxi Blue Sky Water Treatment Equipment Co., Ltd.
Add: No 5,rongqiang Road, Wuxi city, Jiangsu Prov, china
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