Introduction to related knowledge of aluminum profile surface treatment wastewater treatment technology

The nominal amount of water used for the treatment of aluminum profiles is large, a lot of waste water is generated, and harmful substances in the waste water are continuously discharged. The most widely used non-ferrous metal structure material in the aluminum alloy profile industry is in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, and decoration. If left untreated, the environment will be contaminated. At the same time, along with my country's taxation of pollution, it will also increase the cost and burden of enterprises. Therefore, considering the social obligations and benefits of enterprises, wastewater treatment is necessary and necessary. 1. The source and variety of wastewater treated by aluminum profiles: Answer: The wastewater treated by aluminum profiles includes pre-treatment degreasing, followed by acidic washing water, alkaline washing water after alkali corrosion, acidic washing water after acid etching, and oxidation. After the acid washing water, the colored Ni2+, Sn2+, acid washing water, the waste acid and the waste alkali produced by the electrophoretic coating ion exchange device, and a small amount of electrophoretic coating wastewater. The most widely used non-ferrous metal structure material in the aluminum alloy profile industry is in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, and decoration. The waste water is acidic after being mixed up, 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 the nominal active agent and acrylic acid Organic matter such as resin. The waste liquid includes waste sulfuric acid produced during degreasing, waste nitric acid and waste sulfuric acid produced by oxidation, waste liquid produced by coloring, waste acrylic liquid produced by electrophoretic painting, and waste liquid containing Ni2+ and F- produced by sealing. 2. Ways to reduce the discharge of waste water and waste liquid: Answer: The way to reduce waste water and waste liquid is to rationally control the water control time and control the filling angle to reduce the amount of tank liquid carried out. Try to use secondary and tertiary countercurrent rinsing to reduce water consumption. . The most widely used non-ferrous metal structure material in the aluminum alloy profile industry is in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, and decoration. The washing water after acid etching and degreasing is used for washing after alkali corrosion, and the washing water after oxidation is used for washing after acid etching and degreasing. In addition, in order to reduce or avoid the discharge of waste water and waste tank liquid, the production line should be designed and utilized various recovery devices, such as acid corrosion recovery device, alkali corrosion recovery device, anodized aluminum removal device, coloring liquid RO recovery device, electrophoretic paint RO Recycling devices, the use of these recycling devices may reduce the amount of waste water and waste liquid discharge to a greater limit, and at the same time, reduce the production cost to a greater extent. 3. Principles and methods of wastewater treatment for aluminum profile treatment: Answer: The wastewater produced by the aluminum profile treatment is mainly acid-base wastewater, which contains a small amount of harmful anions and cations such as Ni2+, Sn2+, and F-. The treatment method is acid-base medium. The wastewater is acidic, so it is necessary to add alkali to adjust the PH value to about 7~8.5. At the same time, the cations Al3+, Ni2+, Sn2+, Cr3+, etc. all form hydroxide deposits in the middle of the process. The waste water that has passed through the middle heel and the deposition is pumped into the aggregating tank with a pump, and at the same time, the dissolved polyamide flocculant is pumped into the agglomeration tank with a quantitative pump. After agglomeration, the wastewater enters the deposition tank. The deposition methods include inclined plate deposition and air flotation The author believes that the centrifugal deposition method is more firmly used. After the deposition, the clear liquid overflows from the upper overflow and falls into the discharge pool or reprocessing reservoir. The wastewater after the above treatment may be discharged up to the standard. If the wastewater is to be reused, the wastewater may be treated by coarse filtration and outdated into the RO device to remove excess anions, cations, and organics. At this time, the pH value of the water may be low. , It may reach the reuse standard after adjustment by the anion and cation exchange device. The sludge produced by the accumulation is discharged into the sludge pond on schedule, and turned into industrial waste after being treated by a plate press or belt dehydrator, and sent to an industrial waste treatment plant.
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