Cork boiling wastewater treatment at pilot plant scale: Comparison of solar photo-Fenton and ozone (O₃, O₃/H₂O₂). Toxicity and biodegradability assessment

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• 作者：E. De Torres-Soc铆as ; I. Fern谩ndez-Calderero ; I. Oller ; M.J. Trinidad-Lozano ; F.J. Yuste ; S. Malato
• 关键词：Biodegradability ; Cork boiling wastewater ; Industrial wastewater ; Ozonation ; Solar photo-Fenton
• 刊名：Chemical Engineering Journal
• 出版年：December, 2013
• 年：2013
• 卷：234
• 期：Complete
• 页码：232-239
• 全文大小：409 K

文摘

Remediation of cork boiling wastewater was studied as an example of complex industrial wastewater treatment by applying a protocol based on a combination of advanced technologies and chemical-biological assays. Solar photo-Fenton and ozone (alone or in combination with hydrogen peroxide at different pH conditions), at pilot plant scale have been used as chemical oxidation step. Additionally, the effect of a physic-chemical pre-treatment using different flocculants (FeSO₄ and FeCl₃) was evaluated. Although physic-chemical pre-treatment with Fe³⁺ provided good removals of COD, DOC and TSS, it was found that it did not enhance solar photo-Fenton post-treatment. On the contrary, ozone-based process was improved after physic-chemical pre-treatment with Fe³⁺, attaining higher degradation efficiencies with lower ozone consumptions for the combination with O₃ at initial pH 7. Toxicity and biodegradability assays were performed to evaluate possible variations along the oxidation processes. After solar photo-Fenton treatment, toxicity and biodegradability remained constant at their initial values. Then, Zahn-Wellens test was carried out to study long term biodegradability and possible biomass adaptation to the partially photo-treated effluent. Decrease in toxicity values and short term biodegradability enhancement were observed for cork boiling wastewater treated by ozonation systems.