Electrocoagulation with polarity switch for fast oil removal from oil in water emulsions

Journal of Environmental Management
Lorena C A GobbiPaulo S S Porto

Abstract

An electrocoagulation technique using a 3.5 L reactor, with aluminum electrodes in a monopolar arrangement with polarity switch at each 10 s was used to separate oil from synthetic oily water similar in oil concentration to produced water from offshore platforms. Up to 98% of oil removal was achieved after 20 min of processing. Processing time dependence of the oil removal and pH was measured and successfully adjusted to exponential models, indicating a pseudo first order behavior. Statistical analysis was used to prove that electrical conductivity and total solids depend significantly on the concentration of electrolyte (NaCl) in the medium. Oil removal depends mostly on the distance between the electrodes but is proportional to electrolyte concentration when initial pH is 8. Electrocoagulation with polarity switch maximizes the lifetime of the electrodes. The process reduced oil concentration to a value below that stipulated by law, proving it can be an efficient technology to minimize the offshore drilling impact in the environment.

Citations

Jul 14, 2020·Environmental Science and Pollution Research International·Shanshan ZhuKeqiang Qiu
Nov 6, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Mohammad Malakootian, Mohammad Reza Heidari
Nov 6, 2020·Environmental Technology·Nasibu Samson ShonzaPaulo Sérgio da Silva Porto
Jul 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Chao LiuRuby N Michael
Jul 12, 2021·Environmental Science and Pollution Research International·Mahsa Payami ShabestarElnaz Karamati-Niaragh
Nov 24, 2021·Environmental Science and Pollution Research International·Mahdieh MehriBahram Nasernejad

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