Waste water treating method in aluminum section bar oxidizing technology

Abstract

The invention provides a waste water treating method in an aluminum section bar oxidizing technology, wherein the method comprises the treatment steps of waste water containing acids, alkalis and heavy metals: coagulating, deposing, filtrating, ultrafiltrating and nanofiltrating waste water containing no heavy metals, acids and alkalis, directly reusing the reclaimed water after treatment, and integrally utilizing the sludge generated in a production line after dehydrated; and (2) individually treating the waste water containing heavy metals by a recovery device, directly backflowing the treated and recovered heavy metals into a coloring tank and a hole sealing tank, and directly supplementing the fresh water obtained after treatment into a rinsing bath. The waste water treatment method of the invention has advantages of water cyclic utilization, small waste water discharge, integration utilization of sludge, no dangerous waste generation, etc.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method for aluminum profile oxidation wastewater. Background technique [0002] Anodizing is the most commonly used surface treatment technology for aluminum alloys. After surface oxidation, aluminum alloys have a high surface porosity, strong adsorption, easy staining, and easy pollution. Therefore, sealing treatment is required immediately after oxidation. At present, the aluminum profile oxidation process usually includes "degreasing-alkali washing-neutralization-oxidation-coloring-sealing" and other processes, in which the colorant and sealing agent used contain heavy metals such as nickel, and the coloring tank and sealing tank The final cleaning wastewater contains a large amount of heavy metals, and other processes will also produce a large amount of cleaning wastewater containing acids and alkalis. The traditional wastewater treatment process is to bring all t...

AI Technical Summary

Problems solved by technology

The traditional wastewater treatment process is used to treat wastewater, which requires high treatment costs and requires a large amount of water treatment chemicals. The treated effluent is directly discharged, which wastes a lot of water resources.

The treated wastewater contains heavy metals, which seriously affects the natural environment of the surrounding sewage receiving water

The heavy metal content in the sludge generated during the treatment process is very high, which belongs to hazardous waste and requires special disposal, and the sludge disposal cost is extremely high

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