Preliminary field and laboratory testing were conducted to determine the effectiveness of
point-of-use (POU) filters in removing Pb and other corrosion byproducts from drinking
water 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 highly
effective for removing lead (Pb), cadmium (Cd), iron (Fe), and turbidity. The principal
operating concern was that the filters would plug prematurely with iron particulates in
buildings with older galvanized steel piping causing reduced flow rates. Results of field
sampling were used to develop laboratory bench-top testing of the filter system. Testing
was conducted on a filter system that consisted of a 5µm pre-filter and cartridge carbon
filter. Preliminary bench-top testing results indicate that the filter system removed Pb to
levels typically less than or equal to 10 ppb before exhausting its capacity for Pb. Results
also 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 with
intermittent (ON/OFF) flows did not appear to affect Pb removal efficiency. Additional
laboratory testing results showed that elevated iron levels in the influent water stream
caused reduced flow rates and reduced total throughput capacity of the filter system. Includes table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 11/01/2005 |
