The effect of zinc orthophosphate and pH/alkalinity adjustment on copper and lead levels in drinking water

Churchill, D M

doi:10.14288/1.0050311

Cited by 1 publication

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“…Orthophosphate corrosion inhibitors have been widely reported in the literature for being successful at reducing lead and copper corrosion (Boffardi & Sherbondy, 1991;Bradley & Horscroft, 2018;Cardew, 2009;Churchill, 1997;Dodrill & Edwards, 1995;Kirmeyer et al, 2004;Reiber, 1989;Schock et al, 1996;Schock & Fox, 2001;Tully et al, 2019). The ideal pH range for orthophosphate effectiveness for controlling lead corrosion is between 7.2 and 7.8 (Schock, 1989;Schock et al, 1996), similar to the finished water quality in the Denver Water system before March 2020.…”

Section: Comparison Of Orthophosphate Treatment In Coupon and Pipe Ra...mentioning

confidence: 88%

Comparison of coupon and pipe rack studies for selecting corrosion control treatment

Masters

Poncelet‐Johnson²,

Walsh³

et al. 2022

AWWA Water Science

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This study directly compared the data obtained from coupon studies and flow‐through pipe rack studies from two sources in the Denver Water system. The pipe rack study was completed over multiple years using harvested lead service lines. The coupon studies were completed in about 2 months using pure lead coupons. Orthophosphate at 2 mg/L was found to reduce lead concentrations by about 81% in the pipe racks, whereas 74%–81% was observed in the coupons. At an orthophosphate dose of 1 mg/L lead concentrations were reduced by 62%–65% in the pipe loop and by 55%–75% in the coupons, pH at 8.8 reduced lead by 45%–60% in the pipe racks and by 27%–48% in the coupons. The pipe racks were able to give insights into the transition from one condition to another, which is time‐based and dependent on existing pipe scales. Both types of demonstration studies produced similar conclusions about treatment options. The pipe rack was more representative of conditions in the distribution system while the coupon studies were performed in a fraction of the time.

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Section: Comparison Of Orthophosphate Treatment In Coupon and Pipe Ra...mentioning

confidence: 88%

Comparison of coupon and pipe rack studies for selecting corrosion control treatment

Masters

Poncelet‐Johnson²,

Walsh³

et al. 2022

AWWA Water Science

View full text Add to dashboard Cite

show abstract

The effect of zinc orthophosphate and pH/alkalinity adjustment on copper and lead levels in drinking water

Cited by 1 publication

References 0 publications

Comparison of coupon and pipe rack studies for selecting corrosion control treatment

Comparison of coupon and pipe rack studies for selecting corrosion control treatment

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