Coupling Gliding Discharge Treatment and Catalysis by Oyster Shell Powder for Pollution Abatement of Surface Waters

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• 作者：Estella Njoyim ; Paul Ghogomu ; Samuel Laminsi ; Serge Nzali ; Avaly Doubla ; Jean-Louis Brisset
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2009
• 出版时间：November 18, 2009
• 年：2009
• 卷：48
• 期：22
• 页码：9773-9780
• 全文大小：169K
• 年卷期：v.48,no.22(November 18, 2009)
• ISSN：1520-5045

文摘

Adsorption on oyster shell powder (OS) was combined with gliding electric discharge to abate pollution of surface waters sampled in brooks passing through large Cameroonian cities and collecting industrial and domestic wastes. OS powder incorporated into the aqueous samples after exposure to the discharge improved pollutant abatement as compared to the plasma treatment alone. The process kinetics involved pseudo zero-order reactions for treatments longer than 5 min. Total organic carbon linearly decreases with increasing exposure time to the discharge (k ≈ 0.13 mg_C Lp>−1p> minp>−1p> for a 1 g Lp>−1p> standard OS charge). The rate constant linearly increases with the incorporated OS mass, which increases the sample pH. The coupled process is more efficient than a single plasma treatment of the polluted liquid in terms of operation cost, waste abatement ratio, and reaction rate. A chemical model involving known plasma generated species and matching acid−base effects is proposed.