The author regrets that the following Acknowledgements section was omitted from their original paper and apologise for any inconvenience caused.
This research study was supported by Water Research Commission (WRC), South Africa, under a grant research project, K5/1813//3 with the University of Western Cape. The study was conducted in collaboration with the University of Venda and Centre for Scientific and Industrial Research (CSIR).
© IWA Publishing 2016
© IWA Publishing 2016
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