Application of psyllium husk as coagulant and coagulant aid in semi-aerobic landfill leachate treatment

• Published in: Journal of hazardous materials Vol. 190; no. 1; pp. 582 - 587
• Main Authors: Al-Hamadani, Yasir A.J., Yusoff, Mohd Suffian, Umar, Muhammad, Bashir, Mohammed J.K., Adlan, Mohd Nordin
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15-06-2011; Elsevier
• Subjects: Aerobiosis; Alum; Alum Compounds - chemistry; Aluminum Compounds - chemistry; aluminum sulfate; Applied sciences; chemical oxygen demand; Chlorides - chemistry; Coagulants; Coagulation–flocculation; Color; Crack opening displacement; Dosage; Environmental Restoration and Remediation - methods; Exact sciences and technology; Flocculation; General treatment and storage processes; hulls; Landfill; landfill leachates; Landfills; Optimization; Plantago; Pollution; Poly-aluminum chloride (PACl); Psyllium - chemistry; solid wastes; Stabilized leachate; Wastes; Water Pollutants, Chemical - isolation & purification; Water Purification - methods; zeta potential; Coagulation–flocculation; Stabilized leachate; Poly-aluminum chloride (PACl); Alum; Landfill; Water infiltration; Waste dumping; Coagulation; Color; Aerobe; Coagulation-flocculation; Pollution; Flocculation reagent; Chemical oxygen demand; Chlorides; Flocculation; Water quality; Solid waste; pH; Electrokinetic potential; Physicochemical purification; Poly-aluminum chloride (PACI); Leachate; Aluminium sulfate
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2011.03.087

Landfill leachate is a heavily polluted and a likely hazardous liquid that is produced as a result of water infiltration through solid wastes generated industrially and domestically. This study investigates the potential of using psyllium husk as coagulant and coagulant aid for the treatment of landfill leachate. Psyllium husk has been tested as primary coagulant and as coagulant aid with poly-aluminum chloride (PACl) and aluminum sulfate (alum). As primary coagulant, the optimum dosage and pH for PACl were 7.2 and 7.5
g/L, respectively, with removal efficiencies of 55, 80 and 95% for COD, color and TSS, respectively. For alum, the optimum conditions were 11
g/L alum dosage and pH 6.5 with removal efficiencies of 58, 79 and 78% for COD, color and TSS, respectively. The maximum removal efficiencies of COD, color and TSS were 64, 90 and 96%, respectively, when psyllium husk was used as coagulant aid with PACl. Based on the results, psyllium husk was found to be more effective as coagulant aid with PACl in the removal of COD, color and TSS as compared to alum. Zeta potential test was carried out for leachate, PACl, alum and psyllium husk before and after running the jar test to enhance the results of the jar test experiments.