A method for treating passivation wastewater

By using modified adsorbents and composite flocculants, combined with strong oxidants and denitrification steps, the problem of low removal efficiency of aluminum and fluoride ions in existing technologies has been solved, achieving efficient wastewater treatment and maintenance of biochemical reaction efficiency.

CN119569250BActive Publication Date: 2026-05-26DONGGUAN SANRENXING ENVIRONMENTAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGGUAN SANRENXING ENVIRONMENTAL TECH CO LTD
Filing Date
2024-07-24
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies are ineffective at removing aluminum and fluoride ions when treating aluminum-containing pickling and passivation wastewater, leading to reduced biochemical reaction efficiency. At the same time, the use of calcium hydroxide can easily cause the wastewater to have excessively high pH and increased salinity.

Method used

A modified adsorbent, a specific ratio of sodium hydroxide and calcium chloride to adjust the pH, combined with a composite flocculant of polydimethyldiallylammonium chloride, polyaluminum chloride and chitosan, is used to remove aluminum ions and fluoride ions, and the ammonia nitrogen content is reduced through a strong oxidant and denitrification denitrification steps.

Benefits of technology

It effectively removes aluminum and fluoride ions from wastewater, reduces ammonia nitrogen content, maintains biochemical reaction efficiency, avoids salinity increase, and improves total nitrogen removal efficiency.

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Abstract

This invention relates to the field of pickling and passivation wastewater, specifically disclosing a method for treating passivation wastewater. The method involves: adding a modified adsorbent to the passivation wastewater and stirring; then adding sodium hydroxide and calcium chloride to adjust the pH and precipitate and separate aluminum and fluoride ions; next, adding an oxidant to remove high concentrations of ammonia nitrogen from the wastewater; finally, sequentially performing aerobic treatment, anoxic treatment, precipitation treatment, and disinfection treatment to achieve efficient removal of total nitrogen. This method can efficiently remove aluminum ions, fluoride ions, and total nitrogen from passivation wastewater.
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