Integration of electroplating wastewater treatment equipment

wastewater pretreatment
Metal matrix materials, the processing of its plating process can be divided into:
1, the leveling plane (including polishing, polishing, sandblasting, tumbling, brushing, etc.)
2, chemical treatment (including degreasing, rust and erosion, etc.)
3, the electrochemical treatment (including electrochemical degreasing and electrochemical erosion, etc.)

Common basic compounds of NaOH Na2CO3, Na3PO4, of Na2SiO3 degreasing process for oil pollution is particularly serious parts are sometimes also used kerosene, gasoline, acetone, toluene, trichlorethylene, carbon tetrachloride and other organic solvents, degreasing, and thenchemical alkaline degreasing. For the removal of some mineral oil, usually in addition to oil, plus a certain amount of emulsifier, such as the OP emulsifier, AE emulsifiers, triethanolamine, oleic acid soap. Cleaning degreasing process wastewater, and updates waste alkaline wastewater, which often contain oils and other organic compounds.
Pickling rust commonly used are hydrochloric acid, sulfuric acid, in order to prevent the corrosion of plated matrix, often by adding some corrosion inhibitors such as thiourea, sulfonated coal tar, methenamine benzidine. Pickling rust process of cleaning water acidity is high, containing heavy metal ions and a small amount of organic additives.
The pre-treatment wastewater is an important part in the electroplating wastewater treatment, about 50% of the total electroplating wastewater, waste water contains a certain amount of salt, free acid, organic compounds, the components vary greatly, with the kinds of plating, pretreatment technology and factory management level changes.

Plating rinse water
Plating rinse water is a major source of pollution of heavy metals in electroplating operations. The main component of the plating solution of metal salts and complexing agents, including various metal sulfate, chloride, fluoborate, cyanide, ammonium chloride, ammonia acid pyrophosphate, organic phosphonic acids such as. In addition, in order to improve the coating properties, often still in the bath add some organic compounds, such as coumarin as a leveling agent, butynediol thiourea, as a brightener, saccharin, vanillin, Benzylidene acetone, toluene sulfonamide, sulfonic acid. Plating rinse wastewater containing heavy metal ions, but also contain small amounts of organic matter. Rinse wastewater emissions and the type and concentration of heavy metal ions with the physical shape of the plating, the plating solution formulations, methods of rinsing and electroplating operations management level of many factors and change. Especially the rinsing process the concentration of heavy metals from wastewater, a direct impact on resource recovery and waste treatment effect.

Coating after wastewater treatment
Including post-treatment rinsing after passivation, stripping of non-performing coatings and other special surface treatment coating. Post-processing process of the same to produce large amounts of heavy metals in wastewater. In general, which often contain Cr6 +, Cu2 +, Ni2 +, Zn2 +, Fe2 + and other heavy metals; H2SO4, HCl, H3BO3, H3PO4, and NaOH and Na2CO3, acid and alkali material; glycerol, ammonia, acid, hexamethylenetetramine, resist salt S, acetic acid and other organic substances. In general, this type of coating wastewater treatment complex and volatile, water is not stable, generally combined with the mixed wastewater or alkali wastewater processing.

Electroplating wastewater
Plating, passivation, stripping used in the electroplating bath by long-term use or have accumulated a number of other metal ions, or due to some reasons for the destruction of the additive, or some proportion of the active ingredient disorders affect the coating or blunt the quality of the layer. So many factories for the control of impurities in the bath within the scope of the license in the process, the bath abandoned part of the fresh solution, and some factories these failure of Bath discard. Abandoned heavy metal ions of various concentrations of liquid concentration are high, the accumulation of impurities, not only the pollutant types and concentrations of major pollutants, and other metal impurity ion concentration and solution media also tend to have larger differences. These differences determine the special nature of the diversity of technical and process of wastewater treatment.

Currently the treatment of electroplating wastewater is first divided into three categories,
A chromium-containing wastewater
Mainly with the original deal with hexavalent chromium.
B Cyanide wastewater
Mainly breaking cyanide.
C other waste water
Including copper, nickel, zinc, etc.

Electroplating wastewater treatment
The physico-chemical treatment commonly used. Approach is more effective many, but not many can achieve overall compliance. To do good, some, such as Shaanxi Fu Tempo DTCR-heavy metal ion trapping agent, the heavy metal ions in DTCR and wastewater form a macromolecular chelate, and then after flocculation, can be very good remove heavy metal ions in electroplating wastewater, and reach the national standard.
The main source of zinc electroplating and metal processing industrial waste water is towing electroplating or pickling liquid. Pollutants transferred to the rinse water rinsing process by metal. Pickling processes, including metal (zinc or copper) first soaked in strong acid to remove surface oxides, followed by immersion with strong chromic acid brightener credit to deal with. The wastewater contains large amount of hydrochloric acid and zinc, copper and other heavy metal ions and organic brighteners, high toxicity, and some also contain carcinogenic, teratogenic, highly toxic substances, mutagenic hazards to human beings. Electroplating wastewater must be recycled to be done to eliminate or reduce its pollution of the environment.
Electroplating wastewater treatment equipment consists of a regulation pool, plus kits, restoration of the pool, and the reaction cell of pH adjusting tank, flocculation tank, Sedimentation, Van filter, clear water tank, flotation response, activated carbon filter composition

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