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Optimization of aluminium recovery from water treatment sludge using Response Surface Methodology

Theam, Yiew Ooi and Ee, Ling Yong and Md. Din, Mohd. Fadhil and Rezania, Shahabaldin and Aminudin, Eeydzah and Chelliapan, Shreeshivadasan and Abdul Rahman, Azlan and Park, Junboum (2018) Optimization of aluminium recovery from water treatment sludge using Response Surface Methodology. Journal of Environmental Management, 228 . pp. 13-19. ISSN 0301-4797

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Official URL: http://dx.doi.org/10.1016/j.jenvman.2018.09.008

Abstract

For decades, water treatment plants in Malaysia have widely employed aluminium-based coagulant for the removal of colloidal particles in surface water. This generates huge amount of by-product, known as sludge that is either reused for land applications or disposed to landfills. As sludge contains high concentration of aluminium, both can pose severe environmental issues. Therefore, this study explored the potential to recover aluminium from water treatment sludge using acid leaching process. The evaluation of aluminium recovery efficiency was conducted in two phases. The first phase used the one factor at a time (OFAT) approach to study the effects of acid concentration, solid to liquid ratio, temperature and heating time. Meanwhile, second phase emphasized on the optimization of aluminium recovery using Response Surface Methodology (RSM). OFAT results indicated that aluminium recovery increased with the rising temperature and heating time. Acid concentration and solid to liquid ratio, however, showed an initial increment followed by reduction of recovery with increasing concentration and ratio. Due to the solidification of sludge when acid concentration exceeded 4 M, this variable was fixed in the optimization study. RSM predicted that aluminium recovery can achieve 70.3% at optimal values of 4 M, 20.9%, 90 °C and 4.4 h of acid concentration, solid to liquid ratio, temperature and heating time, respectively. Experimental validation demonstrated a recovery of 68.8 ± 0.3%. The small discrepancy of 2.2 ± 0.4% between predicted and validated recovery suggests that RSM was a suitable tool in optimizing aluminium recovery conditions for water treatment sludge.

Item Type:Article
Uncontrolled Keywords:acid leaching, aluminium recovery, response surface methodology, water treatment sludge
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Civil Engineering
ID Code:85434
Deposited By: Yanti Mohd Shah
Deposited On:30 Jun 2020 16:39
Last Modified:30 Jun 2020 16:39

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