Featured Research

from universities, journals, and other organizations

Device Creates Electricity And Treats Wastewater

Date:
July 15, 2005
Source:
Washington University In St. Louis
Summary:
An environmental engineer at Washington University in St. Louis has created a device similar to a hydrogen fuel cell that uses bacteria to treat wastewater and create electricity. Lars Angenent, Ph.D., an assistant professor of Chemical Engineering, and a member of the University's Environmental Engineering Science Program, has devised a microbial fuel cell which he calls an upflow microbial fuel cell (UMFC) that is fed continually.

Jason He (left) and Lars Angenent inspect their microbial fuel cell. The researchers want to scale up the device for industrial use. (David Kilper / WUSTL Photo)

July 7, 2005 — An environmental engineer at Washington University in St. Louis has created a device similar to a hydrogen fuel cell that uses bacteria to treat wastewater and create electricity.

Lars Angenent, Ph.D., assistant professor of Chemical Engineering, and a member of the University's Environmental Engineering Science Program, has devised a microbial fuel cell which he calls an upflow microbial fuel cell (UMFC) that is fed continually and, unlike most microbial fuel cells, works with chambers atop each other rather than beside each other.

Angenent has created electricity with the device — in its current mode, about the size of a thermos bottle — and says it has to be scaled up considerably to someday handle the two million or so gallons of wastewater it needs to treat to churn out enough power.

"We have proven we can generate electricity on a small scale," Angenent said. "It will take time, but we believe the process has potential to be used for local electricity generation.

"The upflow microbial fuel cell is a promising wastewater treatment process and has, as a lab-scale unit, generated electricity and purified artificial wastewater simultaneously for more than five months."

A description of the process and research is in the July issue of Environmental Science and Technology. Angenent's co-authors are Jason He, his doctoral student, and Shelley D. Minter, Ph.D., of the Saint Louis University Chemistry Department.

Angenent has filed a provisional US patent on the process. He has received a $40,000 Bear Cub award from Washington University to develop the concept. The Bear Cub Fund was initiated by the Washington University vice chancellor for research to support faculty in applied studies not normally supported by federal grants from NIH, NSF, and other sources. The purpose of the awards is to support research or development that is designed to extend basic observations to make them more attractive for licensing by commercial entities or to serve as the "foundation" for a start-up company.

Angenent uses a carbon-based foam with a large pore size on which biofilm grows, allowing him to connect two electrodes in the anode and cathode chambers with a conductive wire. In a hydrogen fuel cell a membrane separates the anode and cathode chambers. When hydrogen meets the anode electrode, it splits into protons and electrons, with protons going across the membrane to the cathode chamber, and electrons passing over the wire between electrodes to create a current. Oxygen is added to the cathode chamber, and on the electrode there is a reaction of electron plus proton plus oxygen to form water. Catalysts, such as platinum, are needed on both electrodes to promote the reactions.

"We are doing basically the same thing as is done in a hydrogen fuel cell with our microbial fuel cell," said Angenent, whose graduate student, Jason He has done all the research on the process. "We've found that the bacteria on the anode electrode can act as the catalyst instead of platinum,"

"The bacteria form a biofilm on the anode electrodes, and what I want to do is optimize this process so that we get higher currents, which should allow us to scale up the system,' Angenent said.

Angenent said that producing energy from wastewater should be a high international priority because of population growth and worldwide depletion of energy resources. Wastewater, with its high-content organic matter, also can produce methane and hydrogen fuels, however, that theoretically more readily usable energy can be produced when electricity is produced directly in a microbial fuel cell. He noted that a bioelectricity generating wastewater treatment system in just one large food-processing plant could power as much as 900 American single-family households.


Story Source:

The above story is based on materials provided by Washington University In St. Louis. Note: Materials may be edited for content and length.


Cite This Page:

Washington University In St. Louis. "Device Creates Electricity And Treats Wastewater." ScienceDaily. ScienceDaily, 15 July 2005. <www.sciencedaily.com/releases/2005/07/050712225342.htm>.
Washington University In St. Louis. (2005, July 15). Device Creates Electricity And Treats Wastewater. ScienceDaily. Retrieved April 24, 2014 from www.sciencedaily.com/releases/2005/07/050712225342.htm
Washington University In St. Louis. "Device Creates Electricity And Treats Wastewater." ScienceDaily. www.sciencedaily.com/releases/2005/07/050712225342.htm (accessed April 24, 2014).

Share This



More Matter & Energy News

Thursday, April 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

UN Joint Mission Starts Removing Landmines in Cyprus

UN Joint Mission Starts Removing Landmines in Cyprus

AFP (Apr. 23, 2014) The UN mission in Cyprus (UNFICYP) led a mine clearance demonstration on Wednesday in the UN-controlled buffer zone where demining operations are being conducted near the Cypriot village of Mammari. Duration: 01:00 Video provided by AFP
Powered by NewsLook.com
Air Force: $4.2B Saved from Grounding A-10s

Air Force: $4.2B Saved from Grounding A-10s

AP (Apr. 23, 2014) Speaking about the future of the United States Air Force, Chief of Staff Gen. Mark Welsh says the choice to divest the A-10 fleet was logical and least impactful. (April 23) Video provided by AP
Powered by NewsLook.com
Jets Fuel Jump in Boeing's Revenue

Jets Fuel Jump in Boeing's Revenue

Reuters - Business Video Online (Apr. 23, 2014) A sharp rise in revenue for commercial jets offset a decline in Boeing's defense business. And a big increase in deliveries lifted profitability. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Is North Korea Planning Nuclear Test #4?

Is North Korea Planning Nuclear Test #4?

Newsy (Apr. 22, 2014) South Korean officials say North Korea is preparing to conduct another nuclear test, but is Pyongyang just bluffing this time? Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins