Abstract
Kinetics models are very vital to dumpsite operators and planners as they provide relevant information for effective treatment of leachates. The aim of this work is to model the kinetic process of treatment of Lagos dumpsite leachate using Musa sapientum peels as bio-sorbent with a view of establishing the kinetic parameters of the treatment process. Musa sapientum peels which were collected from Ayetoro market in Epe Local Government area of Lagos State were used to prepare the bio-sorbent. Kinetic process was carried out using 1 g of the prepared bio-sorbent in 100 ml Lagos dumpsite leachate in different conical flasks and at various contacting time. The kinetic data obtained were fitted to different kinetics models. The kinetics models tested were Fractional power model, Lagregren pseudo first – order model, Pseudo second – order model, Kuo – Lotse kinetic model, Blanchard kinetic model and Elovich kinetic model. Other kinetics models considered were Sobkowsk – Czerwi kinetic model, Intraparticle diffusion (IPD) model, Behnajady – Modirshahla – Ghanbery (BMG) model and Diffusion – Chemisorption model. Coefficient of determination (R2) values and the expected nature of the plots of the models were used to screen the tested models. The results revealed that the Pseudo second – order kinetic model has the best R2 value of 0.99996 and the graph followed the expected nature of the plot hence it was adopted in this work. It was concluded that Pseudo second – order kinetic model can be used to navigate the treatment process of Lagos dumpsite using Musa sapientum peels as bio-sorbent.
Highlights
The poor management of solid wastes generated by human activities is really contributing immensely to the environmental problems
The results revealed that the Pseudo second – order kinetic model has the best R2 value of 0.99996 and the graph followed the expected nature of the plot it was adopted in this work
The effect of contact time on the treatment of Lagos dumpsite leachate using Musa sapientum peels as bio-sorbent is shown in Figure 1 which depicts the graph of percentage removal against contact time
Summary
The poor management of solid wastes generated by human activities is really contributing immensely to the environmental problems. The leachates generated from the dumpsites pollute our environment and as a result, the leachates need to be treated before discharging to the environment or water bodies. Leachates can be treated by the use of activated carbons produced from agricultural wastes such as banana peels, woods, coconut shell, orange peels, rice straw, soya cake, cactus leaves, beech leaves and moss [1]. Saima et al (2008) [2] evaluated banana peels in the treatement of arsenic contaminated water. El – Nafaty et al (2013) [3]studied the biosorption and kinetic of oil removal from polluted water using banana peels. The study showed that banana peels obeyed Pseudo second – order kinetic model in the removal of oil from polluted water.
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