A method for combined chemical precipitation and adsorption for treating industrial wastewater

By combining chemical precipitation-adsorption with plasma oxidation and composite adsorbent treatment, the problem of low pollutant removal efficiency in industrial wastewater was solved, achieving a highly efficient and stable pollutant removal effect.

CN113023932BActive Publication Date: 2026-04-03ANHUI DEQI ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-02-02
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Existing industrial wastewater treatment methods suffer from low pollutant removal efficiency and unstable process operation, making it difficult to effectively treat industrial wastewater containing large amounts of toxic and harmful substances.

Method used

The chemical precipitation-adsorption method was adopted. After plasma oxidation treatment, solid calcium hydroxide and aluminum sulfate aqueous solution were added to adjust the pH value. Then, flocculant was added and solid-liquid separation was performed. Finally, a composite adsorbent was used for adsorption treatment. The composite adsorbent was composed of chitosan, cucurbita-modified attapulgite, activated carbon, activated alumina and sepiolite.

Benefits of technology

It significantly reduces the concentration of organic pollutants, phosphorus, and nitrogen in water, ensuring that the concentrations of COD, ammonia nitrogen, and total phosphorus in the treated effluent meet discharge standards, thus achieving efficient and stable pollutant removal.

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Abstract

This invention discloses a method for combined chemical precipitation-adsorption treatment of industrial wastewater, comprising: subjecting industrial wastewater to plasma oxidation treatment, adding solid calcium hydroxide, adjusting pH to 11-12, stirring, adding aluminum sulfate aqueous solution and ferrous sulfate aqueous solution, stirring, adding flocculant, settling, separating solid and liquid, and adsorbing the obtained treated liquid with a composite adsorbent; the preparation of the composite adsorbent comprises: using chitosan and cucurbita[6]urea as raw materials, controlling the conditions to make the two react to obtain material A; mixing material A with acetic acid aqueous solution, adding a mixture of thermally modified attapulgite and alkali-modified attapulgite, stirring, drying, grinding, sieving and mixing with water, adding ethanol aqueous solution of 3-aminopropyltriethoxysilane, adjusting pH to 4-6, heating and stirring, adding ethanol aqueous solution of citric acid, heating and stirring and carrying out hydrothermal reaction, cooling, filtering, washing, drying and mixing with activated carbon, activated alumina and sepiolite.
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Citation Information

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