Winery Wastewater Treatment by integrating Fenton's process with biofiltration by Corbicula fluminea

BACKGROUND Corbicula fluminea is an invasive freshwater clam with strong environmental and economic impact. This pest management should include its application, thus biofiltration by C. fluminea was successfully tested for the treatment of winery wastewater. Fenton's process was used in order to reduce the initial effluent toxicity. RESULTS Clam mortality was observed to significantly decrease when exposed to Fenton's treated samples as compared to untreated wastewater. Although COD depletion by oxidation was strongly affected by the reactants concentration applied, the toxicity of the output effluent did not change considerably even when higher iron and hydrogen peroxide loads were used. Biofiltration led to COD abatements near 100% both when applied to raw and Fenton-treated effluents. However, for the raw effluent significant COD removal only occurred after an initial period where the organic load remained unchanged. CONCLUSION It seems advisable to integrate biofiltration with Fenton's peroxidation as a pre-treatment. The results discussed here support the integration of C. fluminea in wastewater treatment as a potential contribution to pest management.

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