Abstract
The rapid growth of the automobile industry has led to the abundance and indiscriminate disposal of waste tyres which causes environmental pollution and also lead to serious health problems. The absorption of crude oil using waste tyre powder (WTP) was investigated. A three variable Box-Behnken design was used to study the effect of particle size, contact time and temperature on the oil sorption capacity of WTP. Optimization was carried out using Response Surface Methodology (RSM). A quadratic model was obtained to predict the oil sorption capacity of WTP as a function of particle size, contact time and temperature. The optimum conditions of the sorption process obtained from RSM gave a temperature of 30.19oC, contact time 59.04 mins and particle size 0.15mm. A maximum oil sorption capacity of 4.71 g/g was obtained at these optimized conditions. Also, a comparison between the oil sorption efficiency of fresh tyre powder and regenerated tyre powder subjected to the same conditions of particle size, contact time and temperature were carried out. It was shown that the oil sorption capacity of the fresh tyre powder was higher than that of regenerated tyre powder.
Highlights
Nigeria can be considered as a densely populated nation and with it comes acquisition of automobiles of different grades
A maximum oil sorption capacity of 4.71 g/g was obtained at these optimized conditions
Multiple regression was applied on the experimental data and the following second-degree polynomial was found to represent the relationship between the oil sorption capacity (Y) and particle size (X1), contact time (X2) and temperature (X3) in terms of the actual factors
Summary
Nigeria can be considered as a densely populated nation and with it comes acquisition of automobiles of different grades. Connected with these automobiles are waste tyres that have raised so much environmental concerns due to its negative impact on the environment (Adhikari et al, 2000; Kumaravel et al, 2016). Waste tyres are not biodegradable and take up landfill spaces (Williams et al, 1990; Kar, 2011). Ebewele and Dzong (1990) estimated the volume of waste tyres to be about 5 million in a study they carried out between 1979 and 1983. It is envisaged that the volume of waste tyres would quadruple
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