Monitoring of Distribution Water Qualities Under Various Source Water Blending |
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Authors: | James Taylor Zhijian Tang Weizhong Xiao Seungkwan Hong |
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Institution: | (1) Civil and Environmental Engineering Department, University of Central Florida, Orlando, FL 32816, USA;(2) Civil and Environmental Engineering Department, Korea University, 1, 5-ka, Anam-dong, Sungbuk-ku, Seoul, 136-701, Korea |
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Abstract: | The main goal of this large-scale pilot distribution study was to systematically investigate the impacts of blending different
source waters on distribution water qualities. The principal source waters investigated were conventionally treated ground
water (G1), surface water processed by enhanced treatment (S1), and desalted seawater by reverse osmosis membranes (RO). Due
to the nature of raw water quality and associated treatment processes, G1 water had high alkalinity, while S1 and RO sources
were characterized as high sulfate and high chloride waters, respectively. One year of pilot pipe study demonstrated that
water quality was significantly deteriorated by increased color when source water blends with characteristics different from
historic groundwater were introduced to pipe distribution systems. Elevated color was associated with release of iron corrosion
products, mainly from aged unlined cast iron pipes. Iron release increased significantly when exposed to RO and S1 waters:
that is, the greater iron release was experienced with alkalinity reduced below the background of G1 water. Lead and copper
release to water, on the other hand, enhanced with the application of RO and G1 waters, respectively. |
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Keywords: | advanced surface water treatment pipe corrosion pipe distribution water qualities seawater desalination source water blending |
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