New tech turns seawater into drinking water without tons of chemicals(news.umich.edu)

24 pointsby openmaze2 ปีที่แล้ว1 comments

news.umich.edu

New tech turns seawater into drinking water without tons of chemicals

https://news.umich.edu/new-water-purification-technology-helps-turn-seawater-into-drinking-water-without-tons-of-chemicals/

2 comments

tommiegannert2 ปีที่แล้ว

> “Most reverse osmosis membranes don’t remove very much boron, so desalination plants typically have to do some post treatment to get rid of the boron, which can be expensive,” said Jovan Kamcev, U-M assistant professor of chemical engineering and macromolecular science and engineering and a co-corresponding author of the study. “We developed a new technology that’s fairly scalable and can remove boron in an energy-efficient way compared to some of the conventional technologies.”

Goes on to explain how this is post-processing for boron, after reverse osmosis:

> This diagram shows how boron is removed by the researchers’ electrodes. First a majority of the salt ions are removed with reverse osmosis. Then the water flows into a cell containing a membrane with positive (pink) and negative (orange) layers. Similarly charged electrodes face the membrane layers, and when a current is applied, water molecules at the interface of the membranes split into hydrogen and hydroxide ions. The hydroxide ions stick to boron, causing it to stick to the positive electrode.

So the scope of this is boron reduction, not desalination. Useful, but the PR department is taking liberties.

[deleted]2 ปีที่แล้ว