Optimization of tapioca wastewater treatment by electrocoagulation has been conducted. Taguchi design experiment was used to calculate the optimum condition. Electrode distance, an electrical resistance of the wastewater and time of operation were used as the parameters. The results show that the electrocoagulation using bipolar stainless steel electrode was able to treat the cassava starch wastewater. The maximum pollutant removal percentage was achieved by the electrical resistance of 60 ohms at 1.5 cm electrode distance for 30 minutes.
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