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It is well known that increased turbidity in drinking water hasa negative effect on an ultraviolet (UV) disinfection system.Current published research supports the use of UV disinfectionafter filtration only when turbitidy is 1 ntu and lower. Fordrinking water with elevated levels of turbidity from 1 to 10 ntuand beyond, the effectiveness of UV light for disinfection is notwell understood.The authors studied the effects of elevated turbidity on thetransmission of UV light, as well as on UV reactor design andoperation. Their conclusions provide evidence that UV light disinfectioncan be implemented into systems with elevated turbidityof up to 10 ntu, such as before filtration and for unfiltered systems.Especially when used for large, unfiltered systems, thistechnique will provide cost-effective water disinfection. Theauthors also offer information about how to account for theeffects of elevated turbidity by properly measuring unfiltered UVabsorbance, which is a key water quality parameter for UV reactordesign and operation. Includes 32 references, tables, figures.

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Edition: Vol. 95 - No. 4 Published: 04/01/2003 Number of Pages: 11File Size: 1 file , 560 KB