Monitoring natural organic matter and disinfection by-products at different stages in two South African water treatment plants
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1 janvier 2009
- handle: 10670/1.klctme
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Water treatment Water purification Effluent treatment Purification of water Water treatment Sewage--Disinfection Effluent treatment Sewage treatment Purification of sewageCiter ce document
BB Mamba et al., « Monitoring natural organic matter and disinfection by-products at different stages in two South African water treatment plants », Water SA, ID : 10670/1.klctme
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Natural organic matter (NOM) is a complex organic material present in natural surface water. NOM can cause problems during water treatment most notably the formation of toxic disinfection by-products. This study was undertaken in order to assess the effectiveness of some of the water treatment techniques employed by selected water supply companies in South Africa in dealing with NOM. Total organic carbon (TOC) and ultra violet (UV) absorbance at wavelength of 254 nm were measured and used to calculate specific ultra violet absorbance (SUVA), which was used to determine the changes in NOM concentration throughout the water treatment train. Other parameters measured include pH, turbidity, chemical oxygen demand (COD) and conductivity. Water samples were collected from two water treatment plants in South Africa, namely Sedibeng (Balkfontein) and Midvaal. The overall TOC reduction after the water treatment processes was 33% and 30% at Midvaal and Sedibeng, respectively. SUVA values were generally low (