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lead pipes



Transcript

SPEAKER: Turning underground lead pipes into giant electrochemical circuits could be one way to keep drinking water safe. Fast and inexpensive, the technique could give hope to the more than 18 million people in the US who are at risk of developing health problems due to lead contamination, including those affected by the water crisis in Flint, Michigan.

Given the known dangers of lead poisoning, the use of lead pipes today to deliver clean water may seem like a risky practice. But the process can be made safe. The key is to protect pipe surfaces from corroding. Corrosion due to compounds, like naturally occurring dissolved oxygen or chlorine-based disinfectants, can cause lead to leach into water supplies.

Fortunately, that process can be stalled by introducing minute amounts of harmless additives, such as phosphates. These reactive molecules bind to free-floating lead ions and build up an impenetrable layer that keeps all lead safely locked away. To ensure long-term protection, these lead scavengers must be steadily streamed in. The tapering off of this stream is partially what led to the crisis in Flint. While that protective layer can be reformed, it can take years to happen naturally.

That, according to Ashok Gadgil and his team at the University of California Berkeley, shouldn't be the case. Reporting their findings at the latest spring meeting of the American Chemical Society, Gadgil and his colleagues have discovered how to jumpstart the chemical reaction responsible for forming a protective lining in the pipes. By threading a wire through a sample pipe and applying a small external voltage, the team sped up the rate at which phosphate ions clung to the inside of the pipe in the lab. Like running a battery in reverse, that process could reduce the build-up period from a few years to a few hours.

The researchers have yet to run any trials on existing water distribution systems. Currently, they're working on optimizing the process and collaborating with experts at a local water utility in California to understand how real world conditions will affect their setup. If proven feasible, the team's low-tech solution could help millions forego the tremendous cost of replacing their plumbing. More importantly, it could help them reclaim their quality of life with safe drinking water.
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