Journal
DESALINATION AND WATER TREATMENT
Volume 51, Issue 34-36, Pages 6580-6591Publisher
DESALINATION PUBL
DOI: 10.1080/19443994.2013.767215
Keywords
Electro-oxidation; Current density; Stainless steel electrodes; Petroleum wastewater; Phenol; Oil
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Funding
- King Fahd University of Petroleum and Minerals, Saudi Arabia
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A continuous electrochemical process was investigated for the treatment of synthetic petroleum refinery wastewater. Phenol, crude oil, and kaolin were added in concentrations typical to that found in a refinery wastewater to simulate the soluble, immiscible, and colloidal phases, respectively. Stainless steel (AISI 304) electrodes were used in the electrochemical cell, while an immersed ZW-1 ultrafiltration membrane module was utilized for solid-liquid separation. Different operational conditions were investigated by varying current density and contact time. The optimum current density was noted to be 30mAcm(-2) with 20min of contact time. Tap water having a conductivity of 5,000 ohm/cm was used as for the preparation of the synthetic wastewater. The results from series of experiments showed that high total dissolved solids (1,300mg/L) in raw water produced a significant interference in degradation of phenol. However, a removal efficiency of 99 percent was achieved for turbidity, while oil was below the minimum detection limit of 1.4mg/L for the EPA method 1664 used to detect oil in the treated samples.
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