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Application of response surface methodology (RSM) to optimize coagulation–flocculation treatment of leachate using poly–aluminum chloride (PAC) and alum

Ghafari, S. and Aziz, H.A. and Isa, M.H. and Zinatizadeh, A.A. (2009) Application of response surface methodology (RSM) to optimize coagulation–flocculation treatment of leachate using poly–aluminum chloride (PAC) and alum. [Citation Index Journal]

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Abstract

Coagulation–flocculation is a relatively simple physical–chemical technique in treatment of old and stabilized leachate which has been practiced using a variety of conventional coagulants. Polymeric forms of metal coagulants which are increasingly applied in water treatment are not well documented in leachate treatment. In this research, capability of poly-aluminum chloride (PAC) in the treatment of stabilized leachate from Pulau Burung Landfill Site (PBLS), Penang, Malaysia was studied. The removal efficiencies for chemical oxygen demand (COD), turbidity, color and total suspended solid (TSS) obtained using PAC were compared with those obtained using alum as a conventional coagulant. Central composite design (CCD) and response surface method (RSM)were applied to optimize the operating variables viz. coagulant dosage and pH. Quadratic models developed for the four responses (COD, turbidity, color and TSS) studied indicated the optimum conditions to be PAC dosage of 2 g/L atpH7.5 and alum dosage of 9.5 g/L atpH7. The experimental data and model predictions agreed well. COD, turbidity, color and TSS removal efficiencies of 43.1, 94.0, 90.7, and 92.2% for PAC, and 62.8, 88.4, 86.4, and 90.1% for alum were demonstrated.

Item Type:Citation Index Journal
Impact Factor:2.975
Uncontrolled Keywords:Coagulation–flocculation, Leachate, Poly-aluminum chloride (PAC), Response surface methodology (RSM), Central composite design (CCD), Analysis of variances (ANOVA)
Subjects:T Technology > TD Environmental technology. Sanitary engineering
Departments / MOR / COE:Departments > Civil Engineering
ID Code:1336
Deposited By: Assoc Prof Dr Mohamed Hasnain Isa
Deposited On:20 Apr 2010 06:00
Last Modified:19 Jan 2017 08:25

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