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COD removal and toxicity decrease from tannery wastewater by zinc oxide-assisted photocatalysis: a case study.

Maria Claudia Hasegawa, Juliana Feijó de Souza Daniel, Keiko Takashima

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    |June 25, 2014
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    Summary
    This summary is machine-generated.

    Heterogeneous photocatalysis effectively treated tannery wastewater. Optimized conditions using ZnO reduced chemical oxygen demand, total solids, and toxicity, indicating efficient wastewater remediation.

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    Area of Science:

    • Environmental Chemistry
    • Chemical Engineering
    • Materials Science

    Background:

    • Tannery wastewater poses significant environmental challenges due to high organic load and toxicity.
    • Retanning and dyeing steps generate particularly recalcitrant effluent requiring advanced treatment methods.

    Purpose of the Study:

    • To optimize heterogeneous photocatalysis for tannery wastewater treatment.
    • To reduce the toxicity of tannery effluent from retanning and dyeing processes.
    • To investigate the effectiveness of zinc oxide (ZnO) as a photocatalyst.

    Main Methods:

    • Tannery wastewater was filtered and diluted (1:200).
    • Heterogeneous photocatalysis was employed using ZnO (1 g L-1) under optimized conditions (pH 8.0, 30°C, 4h irradiation).
    • Physico-chemical parameters and toxicity (Artemia salina L. lethality assay) were evaluated.

    Main Results:

    • Significant reductions in chemical oxygen demand (COD), biochemical oxygen demand (BODs), total solids, total organic carbon (TOC), and turbidity were achieved.
    • Optimized photocatalysis decreased COD from 15,023 to 350 mg O2 L-1 and BODs from 4374 to 10 mg O2 L-1.
    • Toxicity (LC50) increased from 14.90% to 56.82%, and dissolved oxygen reached 6.45 mg L-1, demonstrating treatment efficacy.

    Conclusions:

    • Optimized heterogeneous photocatalysis using ZnO is a highly effective method for tannery wastewater treatment.
    • The process significantly improves water quality by reducing pollutants and toxicity.
    • This approach offers a sustainable solution for managing challenging industrial effluents.