Abstract
Untreated landfill leachate is harmful to the groundwater resources, environment, and human health. Therefore, proper treatment is needed. This study investigates the efficiency of the aerated electrocoagulation (AEC) method in removing ammonia (NH3-N) and colour in leachate under the influence of current density and to review the data from previous research on the removal of NH3-N and colour in AEC under the influence of pH and aeration rate. In this research, leachate samples from Simpang Renggam Landfill are used, and characterisation for biochemical oxygen demand (BOD), chemical oxygen demand (COD), pH, suspended solids (SS), colour, and NH3-N had been conducted. Ferum and aluminium electrodes with a dimension of 200 mm × 50 mm × 1 mm are used in this experiment. From the data obtained, the optimum current density for the removal of NH3-N and colour using AEC was at 200 A/m² with the percentage of removal 40.66% and 85.91%, respectively. For optimum pH and optimum aeration rate, the data was reviewed from the previous studies, and the maximum efficiency of NH3-N and colour removal from stabilised leached occurred at optimum conditions of pH 7 to 8 and 0.5 L/min-1.5 L/min aeration rate). Based on the observation and previous studies reviewed, aeration can increase the efficiency of NH3-N and colour removal in the electrocoagulation process.
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