title: Colour removal from landfill leachate by coagulation and flocculation processes.
abstract: A study was conducted to investigate the efficiency of coagulation and flocculation processes for removing colour from a semi-aerobic landfill leachate from one of the landfill sites in Malaysia. Four types of coagulant namely aluminium (III) sulphate (alum), ferric (III) chloride, ferrous (II) sulphate and ferric (III) sulphate were studied using standard jar test apparatus. Results indicated that ferric chloride was superior to the other coagulants and removed 94% of colour at an optimum dose of 800 mg/l at pH 4. The effect of coagulant dosages on colour removal showed similar trend as for COD, turbidity and suspended solids. This suggested that colour in landfill leachate was mainly contributed by organic matters with some insoluble forms that exhibited turbidity and suspended solids readings. The results from this study suggested that ferric chloride could be a viable coagulant in managing colour problems associated with landfill leachate.
authors.affiliation: School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia. cehamidi@eng.usm.my
authors.forename: Hamidi Abdul
authors.initials: HA
authors.lastname: Aziz
authors.forename: Salina
authors.initials: S
authors.lastname: Alias
authors.forename: Mohd Nordin
authors.initials: MN
authors.lastname: Adlan
authors.lastname: Faridah
authors.forename: A H
authors.initials: AH
authors.lastname: Asaari
authors.forename: Mohd Shahrir
authors.initials: MS
authors.lastname: Zahari
mesh_terms: D003116:Color; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D012037:Refuse Disposal / Q000379:methods; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical