Partially stabilized leachate is considered as a highly polluted liquid resulting from solid waste disposals in landfills. Treatment of leachate is crucial because of the potential contamination risk of leachate into the environment. The main aim of this study is to investigate, using the jar test, the effects of the basicity (B), dose, and pH of pre hydrolyzed iron on the enhancement of the coagulation process applied to partially stabilized leachate in terms of the percentage removal of suspended solid (SS), color, chemical oxygen demand (COD), and ammonia (NH3). Higher SS, color, COD, and NH3 removal was recorded at a basicity of 0.2, 0.4, 0.6, and 0.6, respectively. On the other hand, the recorded percentages of removal in terms of the dose were as follows: 99% for B=0.6 and dose=0.3 g/L Fe; 96% for B=0.4 and dose=0.2 g/L Fe; 73% for B=0.4 and dose=0.4 g/L Fe; and 19% for B=0.2 and dose=0.4 g/L Fe. Better SS, color, and COD removal was achieved at lower pH (from 4 to 6). For NH3, higher removal was recorded at pH = 12. The result suggested that the factors that affect the coagulation process are ranked as follows: pH, dose, and basicity.
leachate, coagulation, prehydrolyzed iron