Abstract
The objective of present study was to assess the performance of electro-Fenton (EF) process for treatment of the simulated sulphidic SCS (sulphide concentration = 10 g/L and pH = 13.7) using iron electrodes. The experimental runs were performed with simulated wastewater at an adjusted pH of ~ 5 with varying H2O2 dosages of 0.31–1.56 M. The current density, electrode spacing and agitation speed were maintained at 1 mA/cm2, 3 cm and 500 rpm, respectively. The treatment process resulted in complete degradation of sulphides, though the chemical oxygen demand (COD) was not fully removed (upto ~91%). It was observed that the addition of super-stoichiometric H2O2 dosage (i.e., 1.56 M) even caused a decrease in the COD removal. Mere adjustment of wastewater pH to 5 resulted in ~ 48% sulphide removal due to H2S stripping which is just almost 50% of the overall sulphide removal during EF process. Hence, EF process can be considered a potential alternative for the removal of sulphides from spent caustic stream.
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James, M.S., Garg, A. (2022). Electrochemical Treatment of Sulphidic Spent Caustic Waste Stream Generated from Petroleum Refineries. In: Ratan, J.K., Sahu, D., Pandhare, N.N., Bhavanam, A. (eds) Advances in Chemical, Bio and Environmental Engineering. CHEMBIOEN 2021. Environmental Science and Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-96554-9_74
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