Cengar clay was used as a liquid coagulant and the residue as an adsorbent in peat water treatment to improve the parameters of peat water treatment such as color, pH, organic acid and turbidity. The produced liquid coagulant and adsorbent were obtained by clay calcinations at temperature 700 °C for 1 hour and leaching use 0,6 mol H2SO4 100 oC for 2 hours. Liquid coagulant was used in two-stag…