Abstract
The research was aimed at eliminating Vibrio cholerae from raw sewage collected from home spills of Chegutu, Zimbabwe. An experimental approach was used in which homogenized raw sewage, inoculated with Chlorella vulgaris culture was distributed equally into three tanks and left to stand for three weeks. Samples were extracted from the three tanks and tested for the presence of Vibrio cholerae and physico-chemical parameters once in seven days. Results showed a continuous decrease in the quantities of Vibrio cholerae as well as physico-chemical parameters. Vibrio cholerae was totally eliminated from the sewage within 21 days. Chlorella vulgaris can be used as a bioremediation agent to eliminate the Vibrio cholerae from sewage. The research recommends that the prototype designed from this research could be used at a large scale in the elimination of Vibrio cholerae in Municipal raw sewage.
Highlights
Wastewater and sewage treatment is one of the obligatory services municipalities worldwide have to provide their residents with (Nathanson and Ambulkar, 2018)
Results from this study have shown that Vibrio cholerae was eliminated completely within 21 days of treatment due to the influence of Chlorella vulgaris
Samples of raw sewage taken from home spills in Chegutu contained large quantities of Vibrio cholerae that were too many to be counted
Summary
Wastewater and sewage treatment is one of the obligatory services municipalities worldwide have to provide their residents with (Nathanson and Ambulkar, 2018). Many developing countries fail to efficiently treat wastewater because conventional plants are too technical and expensive in their construction and maintenance (Wang et al, 2014). These wastewater treatment plants use expensive chemicals and require massive energy input (Sabuda et al, 2020). Chegutu sewer pipes were laid more than 50 years ago catering for a smaller population (15,000); the population has since ballooned to approximately over 60,000 to date the need for a more efficient sewage reticulation system (Chegutu Municipal Newsletter, 2018).
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