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Electrocoagulation for COD and diesel removal from oily wastewater
Safari, S.; Azadi Aghdam, M. & Kariminia, H.-R.
Abstract
This study investigated the diesel and COD
removal from oily wastewater by electrocoagulation.
Experiments were conducted in a 2-l reactor using aluminum
and iron electrodes. Effects of different parameters
including pH (3–11), time (10–60 min), voltage
(4.5–10.5 V), supporting electrolyte (NaCl concentration),
electrode material and initial diesel concentration
(3500–11,000 mg/L) were studied in order to evaluate the
efficiency of electrocoagulation. Furthermore, the consumption
of energy and the amount of sludge produced by
this method were evaluated. The highest removal efficiency
(COD removal of 99.1 ± 0.2 % and diesel removal of
98.8 ± 0.2 %) was observed under the following conditions:
pH 7, 40 min, 10.5 V, NaCl concentration of 0.5 g/
L, diesel concentration of 3500 mg/L. The consumption of
energy was estimated to be 6.47 kWh/m3, and the amount
of sludge generated was 1995 mg/L. The results demonstrated
that the electrocoagulation is a feasible technique
for treatment of heavily contaminated petroleum refinery
wastewater.
Keywords
COD removal; Diesel removal; Electrocoagulation; GC–MS; Oily wastewater
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