Faculty of Engineering and Built Environment
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Item Pilot study of a horizontal roughing filtration system treating greywater generated from a peri-urban community in Durban, South Africa(IWA Publishing, 2019-02-19) Bakare, B. F.; Mtsweni, S.; Rathilal, S.There is a growing pressure on the available freshwater resources in South Africa and many other countries around the world. This has led to a large scale of interest in the application of water reclamation and reuse of wastewater as alternative water supply sources. This is becoming critical to sustain development and economic growth in the southern Africa region. This study investigated the performance of a horizontal roughing filtration system treating greywater generated from a peri-urban settlement in Durban, South Africa. The horizontal roughing filtration system consists of three compartments containing different sizes of gravels that serve as the filter media. The horizontal roughing filter was operated at a filtration rate of 0.3 m/hr for 90 days. The results indicated that at this low filtration rate, effective reduction in turbidity, conductivity, chemical oxygen demand and total solids can be achieved. Overall average removal efficiencies of 90% turbidity, 70% chemical oxygen demand, 86% conductivity, and 84% total solids were obtained for the entire duration of operation of the horizontal roughing filtration system. Thus, it was concluded that the horizontal roughing filtration system is suitable for the treatment of greywater for non-potable reuse applications although further investigation needs to be conducted for the microbial removal during the treatment.Item Performance of horizontal roughing filter using principal component regression and multiple linear regression treating informal settlement greywater(WCECS, 2019) Mtsweni, S.; Bakare, B. F.; Rathilal, S.Water scarcity remain a major challenge facing many countries around the world. These water challenges results to seeking other possible water alternatives techniques to save available water. Greywater reuse is one such alternative to save water if it can be treated successfully to meet greywater standards for reuse. However, within the usability of greywater at the core is the ability to monitor its quality during treatment that will meet the required standard of water for reuse particularly when water reuse alternatives are considered. The aim of the this paper is to demonstrate beyond the potential usability of the Horizontal Roughing Filter (HRF) which was identified as a possible greywater reuse treatment option/technology while monitoring its performance and effluent greywater quality using principal component approach and principal component regression techniques in HRF as a tool of provision of possible practical solution in community facing water challenges. The study was conducted using a pilot scale HRF to treat informal settlement greywater in the study area in Durban Umlazi, Southern Africa. Results showed that HRF was able to achieve removal efficiency of turbidity in greywater effluent above 90% at a filtration ate of 0.3 m/h and 60% chemical oxygen demand (COD). The predictor variables were temperature, COD, conductivity, total solids and pH. The principal component regression was more robust to identify performance relationship in the data better than multiple linear regression.