Electro-Oxidation of Pistachio Processing Industry Wastewater Using Graphite Anode

In the present study, removal of chemical oxygen demand (COD), total organic carbon (TOC), and total phenols (TP) from pistachio processing industry wastewater was investigated using electro‐oxidation. COD, TOC, and TP removal efficiencies were compared considering stirring speed, support electrolyt...

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Veröffentlicht in:Clean : soil, air, water air, water, 2014-09, Vol.42 (9), p.1232-1238
Hauptverfasser: Fıl, Baybars Ali, Boncukcuoğlu, Recep, Yilmaz, Alper Erdem, Bayar, Serkan
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Sprache:eng
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Zusammenfassung:In the present study, removal of chemical oxygen demand (COD), total organic carbon (TOC), and total phenols (TP) from pistachio processing industry wastewater was investigated using electro‐oxidation. COD, TOC, and TP removal efficiencies were compared considering stirring speed, support electrolyte types, support electrolyte concentrations, wastewater initial pH, and current density by using stainless steel cathodes and graphite anodes. Results showed that optimum values of operating variables, i.e., processing time, stirring speed, wastewater pH, current density, and support electrolyte (NaCl), were 5 h, 400 rpm, 3, 30 mA/cm2, and 1.25 M, respectively. Removal efficiencies of 99.79, 76.55, and 100% were obtained with these values for COD, TOC, and TP, respectively. Removal of COD, TOC, and TP increased with increased chloride concentration and current density at acidic pH. During the electrolytic oxidation of PPIW, removal of COD, TOC, and TP may be primarily due to indirect oxidation, utilizing chlorine/hypochlorite formed by anodic oxidation of chlorine originally existing or added in the wastewater, although in a direct anodic oxidation process, the pollutants are first adsorbed on the anode surface and then destroyed by the anodic electron transfer.
ISSN:1863-0650
1863-0669
DOI:10.1002/clen.201300560