Abstract:
One of the clays contained in Riau is Cengar clay. This study utilizes Cengar clay as a
liquid coagulant. Liquid coagulant was obtained by calcining clay at a temperature of
700 °C for 2 hours and leaching with 0.2 mol H2SO4. Variations for leaching conditions
was selected at temperatures of 80 and 100 °C for 2 hours. The liquid coagulant was
used in peat water treatment processes with parameters TSS (Total Suspended Solid)
and TDS (Total Dissolved Solid). Peat water parameters after treatment were compared
to PP 82 of 2001 and PERMENKES/416/Health Minister/PER/IV/1990. The produced
liquid coagulants have pH between 7.8 and 8.0, levels Al3+ between 0.3355 and 0452
mg/L, and levels Fe3+ between 0.0795 and 0.115 mg/L. Coagulation processes to peat
water by using liquid coagulant reduced parameters TSS between 59.09 and 65.9% and
TDS between 3.2 and 18.98% and that peat water after coagulation agree with water
quality standards.
