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Treatment And Analysis Of Aluminum Surface Wastewater

May 16, 2017

1, aluminum surface treatment of wastewater sources and types

The surface treatment of aluminum surface treatment of the pretreatment of degreasing and after the acid washing water, alkali corrosion after the alkaline washing water, acid water after acid washing, oxidized acid washed water, after coloring with Ni2 +, Sn2 +, Acid water washing, electrophoretic paint ion exchange device produced waste acid, waste alkali and a small amount of electrophoretic paint wastewater. Acid, containing Al3 +, Ni2 +, Sn2 +, Sn4 +, Na +, Cr3 + and other cations, as well as SO42-, F-, NO3-, Cl-, AlO2-, Ac- and other anions, as well as surfactants and acrylic Resin and other organic matter. Waste liquid is degreased and produced by the waste sulfuric acid, waste nitric acid and oxidation of waste sulfuric acid, coloring waste, electrophoresis paint produced by the waste acrylic acid, sealed with Ni2 +, F- and other waste.

2, to reduce waste water and waste discharge approach

Reduce the waste water and waste solution has a reasonable way to control the water control time and control the loading angle to reduce the amount of bath, as far as possible the use of two three-stage countercurrent rinse to reduce water consumption. Acid etching and degreasing water after washing with alkali corrosion, after washing water for acid etching and degreasing after washing. In addition, in order to reduce or avoid the discharge of waste water and waste bath, the production line should design and use various recovery devices such as acid recovery unit, alkali etching recovery device, anodizing aluminum removal device, coloring liquid RO recovery device, electrophoretic paint RO Recycling devices that use these recycling units can minimize the amount of waste water and waste emissions, while also minimizing production costs.

3, aluminum surface treatment of wastewater treatment principles and methods

Aluminum surface treatment of waste water, mainly acid-base wastewater, containing Ni2 +, Sn2 +, F- and other small amount of harmful cations, the treatment is acid and alkali and. Wastewater is generally acidic, to be added alkali and adjust the PH value to 7 ~ 8.5 or so. At the same time in the process of cationic Al3 +, Ni2 +, Sn2 +, Cr3 + and so on the formation of hydroxide precipitation. After the neutralization and precipitation of waste water into the condensate tank with a pump, and with a quantitative pump into the dissolved polyamide flocculant and waste water coagulation, coagulation after the waste water into the sedimentation tank, precipitation method has inclined plate precipitation method, Method, centrifugal precipitation method, the author believes that the use of centrifugal precipitation method is relatively stable, after precipitation, the liquid overflow from the upper overflow into the discharge pool or re-treatment of the reservoir. After the treatment of waste water can be discharged, if you want to waste water reuse, this time the waste water can be filtered through the rough after the RO device for processing, remove the excess yin and cations, organic matter, this time the PH value of water may be low , Can be adjusted through the anion and cation exchange device to meet the reuse criteria. The sludge produced by the precipitation is periodically discharged into the sludge pond and processed into a commercial waste residue by a plate press or a belt dewatering machine and sent to an industrial waste treatment plant.

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