Treatment of Oily Wastewater by Electrocoagulation Process and Optimization of the Experimental Conditions Using Taguchi Method
Abstract
In this study, electrocoagulation process was
used for chemical oxygen demand (COD), total organic carbon (TOC) and turbidity
removal from oily wastewaters and Taguchi experimental method was used to
determine optimum operational conditions. For this purpose, 5 significant
factors (initial pH, current, electrolysis time, air injection flow and
electrode surface area) effective in COD, TOC and turbidity removal from the
wastewaters were optimized. These experimental factors were handled in 4 levels
and experimental conditions were optimized through performing L16 (54)
tests with orthogonal series of Taguchi method. Optimum conditions were
identified as: initial pH of 6 (pHi level 3), current of 1A (I level
2), electrolysis time of 20 min (ECtime level 4), air injection flow
of 2 L/min (air flow level 3) and
electrode surface area of 210 cm2 (electrode surface area level 2).
Under these conditions, experimental and estimated pollutant removal
efficiencies were respectively identified as 92.1-95.6% for COD, as 78.5-80.2%
for TOC and as 96.2-95.7% for turbidity. Closer experimental and estimated
values indicated the available use of Taguchi method for electrocoagulation
process.
Keywords
Electrocoagulation,Taguchi method,Oily wastewater,Removal of COD,Removal of TOC
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