The nominal treatment of
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aluminum profiles requires a large amount of water, resulting in a large amount of waste water and the continuous discharge of harmful substances in the waste water. The aluminum alloy profile industry is the most widely used non-ferrous metal structural material, used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, decoration and other fields. If it is not treated, it will pollute the environment. Coupled with China's emissions tax, it will also increase the company's costs and responsibilities. Therefore, it is necessary and necessary to treat sewage from the two aspects of corporate social responsibility and benefits. Summarized years of research and treatment experience in
aluminum profile nominal treatment and wastewater treatment technology, and proposed a set of feasible wastewater treatment and reuse plans for peers' reference. 1. Sources and types of aluminum profile wastewater treatment. The nominal wastewater treatment of aluminum profiles includes acidic washing water after degreasing, alkaline washing water after alkaline rot, acidic washing water after acid corrosion, acidic washing water after oxidation, waste acid acidic washing water containing Ni2+ and Sn2+ , Acidic washing water produced by electrophoretic paint ion exchange equipment, waste acid and alkali and a small amount of wastewater after electrophoretic paint coloring Aluminum alloy profile is the most widely used non-ferrous metal structural material in industry, in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, decoration and so on. The waste water is acidic after mixing, rich in Al3+, Ni2+, Sn2+, Sn4+, Na+, Cr3+ and other cations, as well as SO42-, F-, NO3-, Cl-, AlO2-, Ac- and other organic substances, as well as nominal active agents and Organic substances such as propionic acid resin. 2. Measures to reduce waste water and waste water discharge The method to reduce waste water and waste liquid is to fairly control the water control time and control the loading angle to reduce the discharge of tank liquid, and try to use two-stage and three-stage countercurrent rinsing to reduce water consumption. The aluminum alloy profile industry is the most widely used non-ferrous metal structural material in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, decoration and so on. In order to reduce or avoid the discharge of waste water and waste tank liquid, the production line should plan and apply various recycling equipment, such as acid corrosion recycling equipment, alkali corrosion recycling equipment, anodizing aluminum removal equipment, coloring liquid RO recycling equipment, electrophoretic paint RO recycling equipment , The application of these recycling equipment can reduce the discharge of waste water and waste liquid to the maximum, and also reduce the production cost to the maximum. 3. The principle and method of nominal treatment of aluminum profile wastewater The waste water produced by the nominal treatment of aluminum profile is Acid-base wastewater is rich in harmful anions and cations such as Ni2+, Sn2+, F-, etc. The purchase method is acid-base. The wastewater is generally acidic, followed by alkaline, and the pH value is adjusted to 7≤8.5. At the same time, the cations Al3+, Ni2+, Sn2+, Cr3+, etc. all form hydroxide deposits in the process. The waste water through the middle heel and sedimentation is pumped into the aggregating tank, together with a quantitative pump, the dissolved polyamide flocculant and waste water are coagulated. After agglomeration, the waste water enters the sedimentation tank. The deposition methods include inclined plate deposition and air flotation. The author believes that the centrifugal sedimentation method is more firmly applied. After sedimentation, the clear liquid overflows from the upper overflow and falls into the discharge pool or reprocessing reservoir. The wastewater through the above treatment may be eligible for discharge. If the wastewater is to be reused, the wastewater at this moment may be passed into the RO equipment through coarse filtration to remove residual anions, cations, and organics. The pH value of the water at this moment may be low and may pass After adjustment, the anion and cation exchange equipment reaches the reuse standard. The sludge generated by the deposition is regularly discharged into the sludge pond, and then becomes industrial waste after being treated by a plate-type cake press or a belt-type dehydrator, and sent to an industrial waste treatment plant.
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