Abstract:
Cengar clay has been used as a basic material for getting a liquid coagulant. Based on the content of Al and Fe which were given, three types of liquid coagulants were
selected to use in coagulation process for decreasing the turbidity and total dissolved
solid of peat water. The three types of liquid coagulants selected were the coagulant
with cation content 28,118 mg/L for Al and 26,818 mg/L for Fe which called liquid
coagulant of Al>Fe, the coagulant with cation content 29,368 mg/L for Al and 29,993
mg/L for Fe which called liquid coagulant of Al≈Fe and the coagulant with cation
content 23,926 mg/L for Al and 34,993 mg/L for Fe which called liquid coagulant of
Al<Fe. The coagulation treatment of each liquid coagulant showed the turbidity and
total dissolved solid were 5 NTU and 187 mg/L for Al>Fe coagulant, 3 NTU and 133
mg/L for Al≈Fe coagulant and 3 NTU and 24 mg/L for Al<Fe coagulant. From
preanalyses of the peat water by conductometer and turbidimeter, they showed that the turbidity and total dissolved solid were 9 NTU and 226 mg/L respectively. The result showed that the liquid coagulant of Al<Fe was the most effective liquid coagulant for decreasing the turbidity and total dissolved solid of peat water. The three results conformed with the PERMENKES No.492/Menkes/Per/IV/2010 about the rule of
drinking water, especially in turbidity and total dissolved solid
