Olduvaiblog: Musings on the coming collapse

Home » Posts tagged 'MIT'

Tag Archives: MIT

Need a Water Filter? Peel a Tree Branch – Our World

Need a Water Filter? Peel a Tree Branch – Our World.

2014•03•05 Jennifer Chu MIT News
  • Need a Water Filter? Peel a Tree Branch
A false-color electron microscope image showing E. coli bacteria (green) trapped over xylem pit membranes (red and blue) in the sapwood after filtration. Image courtesy of the MIT researchers.

MIT News: MIT group shows xylem tissue in sapwood can filter bacteria from contaminated water.

•••

If you’ve run out of drinking water during a lakeside camping trip, there’s a simple solution: Break off a branch from the nearest pine tree, peel away the bark, and slowly pour lake water through the stick. The improvised filter should trap any bacteria, producing fresh, uncontaminated water.

In fact, an MIT team has discovered that this low-tech filtration system can produce up to four litres of drinking water a day — enough to quench the thirst of a typical person.

In a paper published this week in the journal PLoS ONE, the researchers demonstrate that a small piece of sapwood can filter out more than 99 percent of the bacteria E. coli from water. They say the size of the pores in sapwood — which contains xylem tissue evolved to transport sap up the length of a tree — also allows water through while blocking most types of bacteria.

Co-author Rohit Karnik, an associate professor of mechanical engineering at MIT, says sapwood is a promising, low-cost, and efficient material for water filtration, particularly for rural communities where more advanced filtration systems are not readily accessible.

“Today’s filtration membranes have nanoscale pores that are not something you can manufacture in a garage very easily,” Karnik says. “The idea here is that we don’t need to fabricate a membrane, because it’s easily available. You can just take a piece of wood and make a filter out of it.”

The paper’s co-authors include Michael Boutilier and Jongho Lee from MIT, Valerie Chambers from Fletcher-Maynard Academy in Cambridge, Mass., and Varsha Venkatesh from Jericho High School in Jericho, N.Y.

Tapping the flow of sap

There are a number of water-purification technologies on the market today, although many come with drawbacks: Systems that rely on chlorine treatment work well at large scales, but are expensive. Boiling water to remove contaminants requires a great deal of fuel to heat the water. Membrane-based filters, while able to remove microbes, are expensive, require a pump, and can become easily clogged.

Sapwood may offer a low-cost, small-scale alternative. The wood is comprised of xylem, porous tissue that conducts sap from a tree’s roots to its crown through a system of vessels and pores. Each vessel wall is pockmarked with tiny pores called pit membranes, through which sap can essentially hopscotch, flowing from one vessel to another as it feeds structures along a tree’s length. The pores also limit cavitation, a process by which air bubbles can grow and spread in xylem, eventually killing a tree. The xylem’s tiny pores can trap bubbles, preventing them from spreading in the wood.

“Plants have had to figure out how to filter out bubbles but allow easy flow of sap,” Karnik observes. “It’s the same problem with water filtration where we want to filter out microbes but maintain a high flow rate. So it’s a nice coincidence that the problems are similar.”

Seeing red

To study sapwood’s water-filtering potential, the researchers collected branches of white pine and stripped off the outer bark. They cut small sections of sapwood measuring about an inch long and half an inch wide, and mounted each in plastic tubing, sealed with epoxy and secured with clamps.

Before experimenting with contaminated water, the group used water mixed with red ink particles ranging from 70 to 500 nanometers in size. After all the liquid passed through, the researchers sliced the sapwood in half lengthwise, and observed that much of the red dye was contained within the very top layers of the wood, while the filtrate, or filtered water, was clear. This experiment showed that sapwood is naturally able to filter out particles bigger than about 70 nanometers.

However, in another experiment, the team found that sapwood was unable to separate out 20-nanometer particles from water, suggesting that there is a limit to the size of particles coniferous sapwood can filter.

Picking the right plant

Finally, the team flowed inactivated, E. coli-contaminated water through the wood filter. When they examined the xylem under a fluorescent microscope, they saw that bacteria had accumulated around pit membranes in the first few millimeters of the wood. Counting the bacterial cells in the filtered water, the researchers found that the sapwood was able to filter out more than 99 percent of E. coli from water.

Karnik says sapwood likely can filter most types of bacteria, the smallest of which measure about 200 nanometers. However, the filter probably cannot trap most viruses, which are much smaller in size.

Karnik says his group now plans to evaluate the filtering potential of other types of sapwood. In general, flowering trees have smaller pores than coniferous trees, suggesting that they may be able to filter out even smaller particles. However, vessels in flowering trees tend to be much longer, which may be less practical for designing a compact water filter.

Designers interested in using sapwood as a filtering material will also have to find ways to keep the wood damp, or to dry it while retaining the xylem function. In other experiments with dried sapwood, Karnik found that water either did not flow through well, or flowed through cracks, but did not filter out contaminants.

“There’s huge variation between plants,” Karnik says. “There could be much better plants out there that are suitable for this process. Ideally, a filter would be a thin slice of wood you could use for a few days, then throw it away and replace at almost no cost. It’s orders of magnitude cheaper than the high-end membranes on the market today.”

While the pores in sapwood are too big to filter out salts, Saurya Prakash, an assistant professor of mechanical engineering at Ohio State University, says the design could be useful in parts of the world where people collect surface water, which can be polluted with fine dust and particles of decaying plant and animal matter. Most of this detritus, Prakash says, could easily be filtered out by the group’s design.

“The xylem tissue acts as a natural filter, similar to a manmade membrane,” says Prakash, who was not involved in the research. “The study by the Karnik group shows that use of abundant, naturally occurring materials could pave the way for a new generation of water filters that are potentially low-cost enough to be disposable.”

This research was supported by the James H. Ferry Jr. Fund for Innovation in Research Education.

MIT Research on Global Water Stress by 2050 | Peak Resources

MIT Research on Global Water Stress by 2050 | Peak Resources.

Peak Resources investigates the growing concern of global water stress. It is no big secret that the world population of humans is growing at an exponential rate. The growth of the human population has caused almost every nation around the globe to focus its attention on the available of freshwater for the future while some nations must focus on having fresh water today. Add into the mix the continual pressure from global climate change, and you have a lot of trouble. Hotter temperatures mean less ground water, shallower lakes, and rivers, and less water for crops, drinking, and bathing. To set this into motion, MIT researchers developed a new tool that models the ability of the hydrologic cycle to meet the growing needs of the world population through the year 2050.

Water Stress
Water resources are tied to populations of people. By 2050, the world population, is expected to rise to 9.7 Billion. Of those 9.7 billion people, 5 billion are expected to be living in water-stressed communities or regions. Of those 5 billion people, 1 billion are expected to live where there is not enough water to meet daily needs of people, environment, and agriculture. For some nations, this is not news, India, and Middle Eastern countries are already facing water stress issues.

MIT Model
What the MIT model does is it allows researchers to look at the two variables that are going to have the most impact on freshwater over time. Those being socioeconomics, and global climate change. What they find when they look into how the socioeconomic data changes over time, they discovered that the rate at which populations grow and the changes to economic growth lead to situations of water-stress. What they are talking about are emerging markets, where water is already limited. The impact of the situation is made worse by adding in global climate change.

Results of the MIT Model
As populations of villages and cities grow more food is needed, more drinking water is needed, and more water is needed for industry, but water is finite and the amount of available water is decreased as temperatures rise. But emerging markets and developing countries are not the only people hit by water issues and global warming. The study shows that developed nations are also going to feel increased water-stress as time passes and global warming increases. Overall, global warming is expected to impact how, when, and where rain falls. Changing patterns of precipitation will impact most countries around the globe.

While this model shows a good picture of what the future will look like, it shows something even more valuable. It shows that studies and modeling of this nature are deeply important to humanity. Peak Resources sees clearly that those who have the knowledge to forecast accurately, will be the ones who have the power to make changes. Those changes represent resource investment opportunities. Knowledge is the tool that will shape the future. Water demand is getting worse, and as time goes by the question is how do we deal with it today.

%d bloggers like this: