Application of a pre-hydrolyzed iron coagulant on partially stabilized leachate

Abstract

Leachate is a liquid produced from the biodegradation of solid waste in landfill and is normally referred as highly polluted wastewater. Various treatment methods are available and it is highly depended on the characteristics of the leachate. One of the common and simplest methods is using coagulation process. The application of pre-hydrolyzed coagulants in coagulation process is well known for water and wastewater treatment. However, information on the application of pre-hydrolyzed coagulants, especially pre-hydrolyzed iron (PHI), in partially stabilized leachate treatments is not well documented. This study examined the application of PHI on the partially stabilized leachate by determining the optimum basicity ratio, pH, and dose through the removals percentage of suspended solid (SS), color, and chemical oxygen demand (COD). Laboratory jar tests revealed that the optimum PHI basicity ratio, pH, and dosage were 0.1, 5, and 0.2 g/L Fe, respectively. The optimum removals of SS, color, and COD were 99, 95, and 58% respectively. The results indicated that PHI could be potentially useful coagulant for removing SS, color, and COD from partially stabilized landfill leachate.

Keywords:

• Coagulant
• Pre-hydrolyzed iron
• Leachate
• Basicity ratio

Acknowledgments

This study was funded by Universiti Sains Malaysia. The authors wish to acknowledge the cooperation of Majlis Perbandaran, Taiping, Perak during the course of the study.