6. Conclusion

Pseudomonas aeruginosa, isolated from wastewater in the Notwane Sewage Treatment Plant was successfully used in biodegradation of recalcitrant polychlorinated biphenyls (PCBs). This having been successfully employed at the micro level, and further tests can be carried out to validate the results obtained in this study. With this recommendation in place, it is ideal to say that employing bacteria in the biodegradation processes of recalcitrant PCBs will be highly cost effective as it is a biotechnological process. The process will enable developing countries to employ effective but easy to maintain at a cost effective mode means of wastewater treatment. This wholly will also enable these countries to address the problem of water shortage at the same time practicing water conservation strategies. This is in a way contributing toward addressing the sustainable development goals (SDGs). With the findings from this study, a recommendation for further experimentation on a larger scale is made so as to safely recycle the sewage water for purposes of redirecting to Gaborone dam. This in a way will aid in curbing the problem of water shortage, of course, taking into consideration other factors, such as total coliforms, Escherichia coli, and other pathogenic organisms and chemicals. These have to be within the expected standards according to Botswana Bureau of Standards (BOBS) limits as well as international World Health Organization (WHO) standards.

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