Keywords: leachate treatment, landfill leachate, limestone, zeolite, GAC, granular activated carbon, filtration, coagulation, PAC, polyaluminium chloride, aluminium sulphate, Malaysia
Application of combined filtration and coagulation for semi-aerobic leachate treatment
The landfill leachate was taken from the Pulau Burung Landfill Site (PBLS), Malaysia. Filtration by limestone-zeolite (15 : 25) and limestone-GAC (15 : 25) with filtration rate = 0.01 m3/m2.minute showed that 70% and 85% of colour and 42% and 70% COD were removed, respectively. Maximum colour removal (93% and 92%) and COD removal (56% and 46%) were achieved by the addition of 2000 mg/L PAC and 9000 mg/L alum respectively. Filtration by limestone-zeolite (15 : 25) and limestone-GAC (15 : 25) followed by coagulation at optimum dosage of 800 mg/L PAC, was efficient to reduce colour (98% and 99%) and COD (70% and 86%) respectively.