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Oil palm ash as partial replacement of cement for solidification/stabilization of nickel hydroxide sludge
Journal article   Peer reviewed

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

C-Y Yin, W.S. Wan Ali and Y.P. Lim
Journal of Hazardous Materials, Vol.150(2), pp.413-418
2008
DOI: https://doi.org/10.1016/j.jhazmat.2007.04.119
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Abstract

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/Sd = 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.

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#12 Responsible Consumption & Production

Source: InCites

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21 Times Cited - Web of Science

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Citation topics
7 Engineering & Materials Science
7.121 Concrete Science
7.121.26 Advanced Concrete
Web Of Science research areas
Engineering, Environmental
Environmental Sciences
ESI research areas
Engineering
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