Abstract
Electrocoagulation (EC) was investigated as a potential landfill leachate treatment technique. EC was performed using a laboratory-scale 2L reactor, with aluminum electrodes, with an aim to find the most efficient conditions of current density (J) and electrolysis time. The rate of coagulant generation was observed to be high for a high applied current. The best removal efficiencies were obtained by applying J of 128 A m−² for 90 min of electrolysis, removing 82 %, 82 %, 40 %, 90 %, and 40 % of color, turbidity, chemical oxygen demand, biological oxygen demand, and ultraviolet absorbance at a wavelength of 254 (Abs254), respectively. The removal rates were slow for the smallest J applied. The sulfates showed complete removal with a J of 96 and 64 A m−² and the pH of the leachate increased with increasing electrolysis time and J owing to electrogenerated hydroxyl (OH−) ions. Electrocoagulation exhibited more efficient BOD removal (84 %–90 %), indicating its excellent capability of removing biodegradable organic material from wastewater.
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