AWWA ACE68705

This powerpoint presentation begins by presenting the motivation for research: corroded mains in drinking waterdistribution systems. Therepair option of in situ relining is presented. Study objective was todetermine the water quality andaesthetic effects of a newly installed,cement mortar lining material. Testing protocol and water quality test methodology for the following are given: alkalinity, pH, hardness;metals leaching;disinfectant consumption;disinfection byproduct formation;total organic carbon; and,odor. Presentation conclusions indicate that: water types performed similarly for all pH anddisinfectant combinations;critical point on day 9 - significant decrease in mostleachate release rates;aluminum concentration driven by available aluminumsilicates in uncured cement, bound in mortar matrix ascuring proceeds;high pH, alkalinity and Ca values driven by dissolution ofCa(OH)₂ which is a byproduct of cure reactions;Mg(OH)₂ precipitation occurs due to high pH;TOC release rate is low and decreases rapidly aftertwo days;DBP formation rates are not high and decreaserapidly with time;Cement odor intensity remained moderately high forfirst 14 days of testing;Alkalinity and pH results consistent withprevious AWWARF research (Douglas,Merrill and Caitlin, 1996);high pH and alkalinity may result in consumercomplaints to include a detectable off-taste;odor would be noted by consumers particularly inlow flow or dead end areas;cement mortar lining may not be best choice withlow alkalinity-low hardness waters; and,aluminum concentration is elevated during firstweek of water contact time. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

26

File Size:

1 file , 4.4 MB