i Bioprospecting for Novel Biosurfactants and Biosurfactant Producing Bacteria in Wastewater by Thando Ndlovu Dissertation presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy at the University of Stellenbosch Promoter: Prof. Wesaal Khan Co-Promoters: Dr Sehaam Khan and Prof. Marina Rautenbach Faculty of Science Department of Microbiology March 2017