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Leachate landfill refers to the liquid that drains from a landfill site, containing organic and inorganic compounds, heavy metals, and harmful pollutants that contribute to environmental risks if it is not treated properly. This study aims to detail characterize the leachate landfill and elucidate the mechanism of coagulation (using aluminium and iron-based coagulant) and electrochemical oxidation for leachate treatment. Jar test was conducted at different dosages of aluminium sulphate and copperas and different initial pH of raw leachate, specifically for COD, BOD and TSS removal. Colour however, a crucial leachate parameter that needs be treated and chemical coagulation was not good enough to remove it. Thus, electro- oxidation has been applied to treat colour in leachate treatment. Overall findings show that aluminium sulphate promoted a better performance in coagulation treatment of leachate compared to copperas when it was successfully removed 75%, 94% and 96% COD, BOD and TSS, respectively, at optimum dosage of 1000ppm and initial pH of 7. The coagulation-adsorption analysis revealed that the use of Alum in coagulation adsorption to remove BOD, COD, and TSS from leachate might be viewed as a multilayer formation with non-uniform distribution of adsorbed particles. While the electro-oxidation (EO) was successfully removed around 80% colour after the treatment process. The integration process of chemical coagulation and electro- oxidation exhibited a good fundamental knowledge that can be applied for pilot and industrial scale of leachate treatment.
Hamzah et al. (Thu,) studied this question.