AWWA WQTC62415

Preliminary field and laboratory testing were conducted to determine the effectiveness ofpoint-of-use (POU) filters in removing Pb and other corrosion byproducts from drinkingwater at bubbler fountains and other potable water sources in Seattle Public Schools.POU filter installations and sampling at 9 schools indicated that the filters were highlyeffective for removing lead (Pb), cadmium (Cd), iron (Fe), and turbidity. The principaloperating concern was that the filters would plug prematurely with iron particulates inbuildings with older galvanized steel piping causing reduced flow rates. Results of fieldsampling were used to develop laboratory bench-top testing of the filter system. Testingwas conducted on a filter system that consisted of a 5µm pre-filter and cartridge carbonfilter. Preliminary bench-top testing results indicate that the filter system removed Pb tolevels typically less than or equal to 10 ppb before exhausting its capacity for Pb. Resultsalso indicate that the pre-filter provided significant removal of Pb. Pre-conditioning (e.g.,soaking) of the filter system prior to installation or operating the filter system withintermittent (ON/OFF) flows did not appear to affect Pb removal efficiency. Additionallaboratory testing results showed that elevated iron levels in the influent water streamcaused reduced flow rates and reduced total throughput capacity of the filter system. Includes table, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2005

Number of Pages:

13

File Size:

1 file , 1.1 MB