Abstract
The performance of a water treatment plant comprising of the Horizontal f Iow Roughing F i Iter (HRF) / Slow Sand Filter (SSF) System was evaluated by monitoring the water quality of the inlet water and the plant filtrates for a Improper operational procedures and period of two months. the absence of adequate maintenance of the plant was found to have resulted to relatively Iow removal efficiency. This subsequently improved as a result of plant rehabilitation and introduction of new operational procedures and became comparable to the performance of HRE/SSF plants documented in literature. For example, as a result of the changes introduced, the mean overall plant removal efficiency of apparent colour, turbidity and Faecal Coliforms increased from 23.1, 43.1 and 79.7 8, respectively to 58.7, 69.3 and 97.8 8. The increase in the total hardness of the HRF filtrate observed was possibly caused by the partial dissolution of The authors recommend that the filter media in the HRF. careful selection of the filter media for HRF is necessary This study in order to avoid or minimize such incidences. also showed that adequate knowledge and skills of the plant caretaker is crucial to the successful operation of HRF/SSF plants especially those operating at declining rate of filtration.
Recommended Citation
A, M. T. (1992). The Performance of a Horizontal Flow Roughing Filter/Slow Sand Filter Water Treatment Plant in Tanzania. Tanzania Journal of Engineering and Technology (TJET), 16(1), 62-82. https://doi.org/https://doi.org/10.52339/tjet.v16i1.138
Publisher Name
University of Dar es Salaam