Abstract:
Natural clay was used as a raw material for manufacture liquid coagulant. Natural clay was calcined at temperature of 700oC for 1 hour. Then, calcined clay was leached by 0,2 moles sulfuric acid at various temperature of 80oC and 100oC for 2 hours. Liquid coagulant was coded as KLC80 for leached at temperature 80oC and KLC100 for leached at temperature 100oC. Liquid coagulant was characterized by Atomic Absorption Spectrometer (AAS) to determine ion content of extracted Al3+ and Fe3+ after leaching process. Coagulation process by KLC80 and KLC100 for treatment of peat water with volume ratio of coagulant : peat water of 0,5:10 (v/v) in 500 mL of peat water has high efficiency in reducing color content, organic matter and turbidity. KLC100 was better than KLC80 for removal the parameters of peat water. The result showed that efficiency of coagulation was able to have the largest decrease with a value of 89.02% for color content, 69.78% for organic matter content, and 71.4% for turbidity. However, the efficiency value obtained after coagulation was still out of the trunk threshold allowed by PERMENKES/No.416/MENKES/PER/IX/1990
