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On‐line Orthophosphate Monitoring, Automated Dosing Optimize Washington, D.C.'s Lead Reduction Program
Author(s) -
Standard Devin S.
Publication year - 2006
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.2006.tb07766.x
Subject(s) - lead (geology) , dosing , environmental science , residual , computer science , chemistry , organic chemistry , algorithm , geomorphology , geology
This article discusses maintaining adequate orthophosphate residuals in the distribution system at all times, and how it has been a key component of lead reduction strategy. More than 90% of the homes sampled for lead in drinking water in Washington, D.C., during the January‐June 2005 monitoring period had lead levels at or below the US Environmental Protection Agency's (USEPA's) lead action level, the result of an orthophosphate corrosion control program initiated in the summer of 2004. Under plant‐scale implementation of orthophosphate feed for corrosion control, trace amounts of orthophosphate entering the distribution system must now be carefully tracked. Automated dosing control and on‐line orthophosphate analysis supplemented with daily grab sample analysis ensure that proper residual requirements for optimum lead control are met.