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Research Publications (Academic Support)

Permanent URI for this collectionhttp://ir-dev.dut.ac.za/handle/10321/211

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Author: search.filters.author.Otieno, Fredrick Alfred O.Has files: No

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    Integrating quality and cost of surface raw water : upper and middle Vaal water management areas South Africa
    (IWA Publishing, 2010) Dzwairo, Bloodless; Otieno, Fredrick Alfred O.
    The user-pays principle encourages use of a water tariff structure that incorporates pollution and/or depletion of a water resource because that water represents a capital resource base. Development of a tool that models variability of surface raw water quality in order to predict cost of treatment thus makes economic sense. This paper forms the backbone for an on-going doctoral study in South Africa's Upper and Middle Vaal Water Management Areas (U&MVWMAs) of the Vaal River (VR). Specific objectives of the overall research are; to carry out pollutant tracer hydrochemistry of specific reaches of the U&MVWMAs including producing an integrated ecological functionality for the whole study area, and to develop a tool that models the variability of surface raw water quality using surface raw water tariffs and water quality data for years 2003–2008. This paper concluded that downstream water boards (WBs) paid a higher water resources management charge (WRMC) for more polluted raw water than upstream WBs. It was recommended that a quality-cost model be incorporated at tier1 of the cost chain for water services to ensure fairness of service delivery and spread of burden to consumers.
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    Treating high nitrate groundwater using surfactant modified zeolite in fixed bed column
    (Taylor and Francis, 2011-05-02) Masukume, Mike; Eskandarpour, Akbar; Onyango, Maurice S.; Ochieng, Aoyi; Otieno, Fredrick Alfred O.
    High levels of nitrate in South African groundwater used for drinking purposes are a cause of concern due to the possible human health risks associated with consuming nitrate contaminated water. In this study, nitrate removal using surfactant modified zeolite (SMZ) in fixed bed column is explored. The performance of SMZ is studied as a function of bed height, initial concentration, flow rate, and bed diameter. The number of bed volumes processed and capacity of the bed at breakthrough point are used as performance indicators. The bed performance improves with a decrease in bed height while column diameter has no influence on bed performance. Within the studied flow rate range, the highest number of bed volumes processed and bed capacity are observed at a flow rate of 5 mL/min. In an adsorption-desorption process, the performance of SMZ is found to be poor in the subsequent cycle suggesting that the media is suited for single-use only.