Utilization of Polyaluminium Chloride (PAC) and Tapioca Peel Powder (TPP) in Coagulation of Leachate for Degradation of Suspended Solids, Color, and Chemical Oxygen Demand

Treatment of leachate requires highly chemical treatment method that may contribute hazard to environment. Hence, a verdant composite coagulant is utilized as an alternative to excessive usage of inorganic coagulant in treatment of leachate. The new composite coagulant (PACTPP) developed in this study is from polyaluminium chloride (PAC) and tapioca peel powder (TPP). The aim of this study is to evaluate the efficiency of different ratio of PACTPP in coagulation of leachate through degradation of suspended solids (SS), color, and chemical oxygen demand (COD) in Simpang Renggam landfill under the optimum leachate pH and dose of coagulant. The leachate can be categorized as old leachate. From this study, the result obtained for optimum ratio was 4(TPP): 7(PAC) and optimum dosage of 3000 mg/L with percentage removal for SS, colour, and COD was 70.0%, 86.1%, 65.34% respectively. Meanwhile the optimum pH of leachate sample was at pH 6, by removing 63.0% of SS, 76.26% of color, and 58.6% of COD. Thus, by the utilization of PACTPP, the discharge standard requirement were able to achieve except for colour parameter.