phosphate inhibitor treatments for lead pipes
1 view
Skip to first unread message
j sinopoli
Aug 13, 2019, 1:23:40 PM8/13/19
to legacy lead
slightly off subject from soil, but still relevant re using phosphate treatments to make lead less bioavailable
I was listening to a radio interview about Newark where the water itself had become corrosive and was leaching lead from old pipes, in part from the chemical treatments the city was using (they have since changed their treatment strategy)
I was listening to a radio interview about Newark where the water itself had become corrosive and was leaching lead from old pipes, in part from the chemical treatments the city was using (they have since changed their treatment strategy)
"Construction of the new corrosion control treatment (CCT) system at the City's Rechlorination Station in Montclair is complete. The system, which adds zinc orthophosphate to the water system, is online and optimization of the system is ongoing."
https://www.newarkleadserviceline.com/program-overview
https://en.wikipedia.org/wiki/Zinc_phosphate
I've heard of bottled water brands being acidic (leading to alkaline 9.5 pH products like Essentia) but not drinking water mains. anyway of course their solution is a phosphate treatment
https://www.newarkleadserviceline.com/program-overview
https://en.wikipedia.org/wiki/Zinc_phosphate
I've heard of bottled water brands being acidic (leading to alkaline 9.5 pH products like Essentia) but not drinking water mains. anyway of course their solution is a phosphate treatment
does anybody know what NYC uses for water corrosion control, if anything?
https://www.hydroviv.com/blogs/water-smarts/orthophosphate
"Orthophosphate is a common corrosion inhibitor used by water suppliers to prevent lead pipes from leaching. When orthophosphate water treatment is added to a water source, it reacts with lead to create a mineral-like crust inside of the lead pipe. This crust acts as a coating which prevents further lead corrosion. The use of orthophosphate treatment in drinking water became popularized in 2001, during the lead crisis in Washington, D.C. Lead contamination in many cities including D.C. and Flint, occurs when a city’s water becomes more corrosive, which can allow for lead from pipes to leach into the drinking water supply. When the lead problem initially occurred, cities such as Flint, Michigan, Durham and Greenville, North Carolina, and Jackson, Mississippi didn’t learn from D.C’s mistakes and all had lead outbreaks.
https://www.youtube.com/watch?v=LC6OJ92-uEI
Does orthophosphate fix lead contamination? It certainly can. Once the protective layer is formed, cities can find that lead concentrations in the water drop by 90%. However, Orthophosphate is somewhat of a bandaid to temporarily fix the presence of lead in drinking water. For example, if the protective layer is corroded away or otherwise disturbed (e.g. in the case of a partial service line replacement or the water’s corrosivity changes), lead can leach back into the water. Finally, not all municipalities are adding orthophosphate to drinking water because of its cost."
"Orthophosphate is a common corrosion inhibitor used by water suppliers to prevent lead pipes from leaching. When orthophosphate water treatment is added to a water source, it reacts with lead to create a mineral-like crust inside of the lead pipe. This crust acts as a coating which prevents further lead corrosion. The use of orthophosphate treatment in drinking water became popularized in 2001, during the lead crisis in Washington, D.C. Lead contamination in many cities including D.C. and Flint, occurs when a city’s water becomes more corrosive, which can allow for lead from pipes to leach into the drinking water supply. When the lead problem initially occurred, cities such as Flint, Michigan, Durham and Greenville, North Carolina, and Jackson, Mississippi didn’t learn from D.C’s mistakes and all had lead outbreaks.
https://www.youtube.com/watch?v=LC6OJ92-uEI
Does orthophosphate fix lead contamination? It certainly can. Once the protective layer is formed, cities can find that lead concentrations in the water drop by 90%. However, Orthophosphate is somewhat of a bandaid to temporarily fix the presence of lead in drinking water. For example, if the protective layer is corroded away or otherwise disturbed (e.g. in the case of a partial service line replacement or the water’s corrosivity changes), lead can leach back into the water. Finally, not all municipalities are adding orthophosphate to drinking water because of its cost."
Reply all
Reply to author
Forward
0 new messages