Industrial Aluminum Profile will generate a lot of wastewater during surface treatment, and there will be a certain amount of harmful substances in the wastewater. If it is not treated, it will cause a certain impact on the environment. The technology, the following Modular Pipe
System Manufacturer to let you know in detail.
1. Sources and types of wastewater from aluminum surface treatment
Wastewater treated on the surface of aluminum profiles includes pre-treated degreasing and acidic washing water, alkaline washing water after alkali corrosion, acid washing water after acid etching, acid washing water after oxidation, and Ni2 +, Sn2 +, Acidic washing water, waste acid, waste alkali and a small amount of wastewater from electrophoretic painting and ion exchange. The wastewater is acidic after mixing, as well as organic substances such as surfactants and acrylic resins. The waste liquid includes waste sulfuric acid produced by degreasing and neutralization, waste sulfuric acid produced by oxidation, waste sulfuric acid produced by oxidation, waste liquid produced by coloring, waste acrylic acid produced by electrophoretic painting, and waste liquid containing Ni2 + and F- produced by sealing.
Aluminum Profile
2. Ways to reduce the discharge of wastewater and waste liquid
The methods of reducing wastewater and waste liquid include reasonable control of water control time and control of charging angle to reduce the amount of tank liquid carry-out and try to use two-level and three-level countercurrent rinsing to reduce water consumption. The washing water after acid etching and degreasing is used for washing after alkaline 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 wastewater and waste tank liquid, the production line should design and use various recovery devices, such as acid etching recovery device, alkaline etching recovery device, anodizing aluminum removal device, coloring liquid RO recovery device, electrophoretic paint RO Recovery devices. The use of these recovery devices can reduce the amount of wastewater and waste liquid discharge to a large extent, and also greatly reduce the production cost.
3. Principles and methods of aluminum profile surface treatment wastewater treatment
The wastewater generated from the surface treatment of aluminum profiles is mainly acid-base wastewater, which contains a small number of harmful anions and cations such as Ni2 +, Sn2 +, and F-. The treatment method is acid-base neutralization. Wastewater is generally acidic, and alkali must be added to neutralize it, and the pH value should be adjusted to about 7-8.5. At the same time, during the neutralization process, the cations Al3 +, Ni2 +, Sn2 +, Cr3 +, etc. all form hydroxide precipitates. The neutralized and precipitated wastewater is pumped into the coagulation tank by a pump, and the dissolved polyamide flocculant is coagulated with the wastewater by a quantitative pump. After the coagulation, the wastewater enters the coagulation tank. The precipitation method is an inclined plate precipitation method, air flotation a method, centrifugal sedimentation method, etc., the author believes that the centrifugal sedimentation method is more stable. After sedimentation, the supernatant liquid overflows from the upper overflow port and enters the drainage tank or reprocessing reservoir.
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