Oil palm ash as partial replacement of cement for solidification/stabilization of nickel hydroxide sludge

In this study, solidification/stabilization (S/S) of nickel hydroxide sludge using ordinary Portland cement (OPC) and oil palm ash (OPA) was carried out. The effects of increased substitution of OPA wt% in the S/S mix designs on the treated samples’ physical and chemical characteristics were investi...

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Bibliographic Details
Published in:Journal of hazardous materials 2008-01, Vol.150 (2), p.413-418
Main Authors: Yin, Chun Yang, Wan Ali, Wan Shabuddin, Lim, Ying Pei
Format: Article
Language:English
Subjects:
Applied sciences
Carbon
Coal Ash
Construction Materials
Exact sciences and technology
General treatment and storage processes
Hydrogen-Ion Concentration
Hydroxides - chemistry
Nickel - chemistry
Nickel hydroxide sludge
Oil palm ash
Ordinary Portland cement
Palm Oil
Particulate Matter
Plant Oils - chemistry
Pollution
Sewage - chemistry
Solidification/stabilization
Waste Management - methods
Wastes
X-Ray Diffraction
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Summary:In this study, solidification/stabilization (S/S) of nickel hydroxide sludge using ordinary Portland cement (OPC) and oil palm ash (OPA) was carried out. The effects of increased substitution of OPA wt% in the S/S mix designs on the treated samples’ physical and chemical characteristics were investigated. The physical characteristics studied were unconfined compressive strength (UCS) and changes in crystalline phases while chemical characteristics studied were leachability of nickel and leachate pH. Results indicated the optimum mix design for S/S of nickel hydroxide sludge using both OPC and OPA at B/S d = 1 in terms of cost-effectiveness and treatment efficiency was 15 wt% OPA, 35 wt% OPC and 50 wt% sludge. The sufficient UCS and low leached nickel concentrations shown for this mix design indicate the viability of using OPA as substitute of OPC as it can significantly reduce cost normally incurred by usage of high amounts of OPC.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2007.04.119