Abstract
A Seattle University senior engineering design team evaluated the treatment performance of a point-of-use microfiltration-ultraviolet light (MF-UV) drinking water treatment system and of an ultrafiltration (UF) unit. The MF-UV system reduced turbidity by 70 percent and inactivated 100 percent of E.coli from model water. The UF system removed 100 percent of all turbidity and bacteria. The combined MF-UF-UV treatment system can provide up to 33,120 liters of water per day and meet basic human water needs at an annual cost of approximately US$0.80 per capita. To maintain safe water quality during transport and storage, on-site generated chlorine can be added to the MF-UF-UV treated water. The team evaluated the performance of a chlorine generator and confirmed that chlorine testing strips were excellent surrogates for the N,N-diethyl-p-phenylenediamine (DPD) colorimetric method. Public-private partnerships may be required to ensure long-term sustainability of these drinking water treatment systems in the developing world.
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