A wooden water filter

A recent paper on arXiv.org (also reported on the MIT technology review) suggests an interesting approach to water filtering.


The water filter suggested by Lee, Boutilier, Chambers, Venkatesh, and Karnik

The vessels of plant xylem consist of tubular cells which undergo programmed cell death, leaving long thin tubes which conduct water to the top of even the tallest tree, through capillary action. As illustrated below, the individual xylem vessel elements include perforation plates at their ends; it is these which can act as water filters.

Lee, Boutilier, Chambers, Venkatesh, and Karnik found that the water filter illustrated above could remove particles larger than 0.1 µm – enough to filter out bacteria, though not viruses. Epoxy glue is needed to seal the filtering wood into tubing, however, and the flow rate is a low 180 ml per hour, even under pressure. Still, this is a very interesting low-cost water-purification technique.


Xylem cells (image by Kelvinsong)

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.