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Rhodococcus bacteria are among the strains useful in bioremediation for their absorption of mineral contaminates.  (Source: University of Cambridge)
New research promises sustainable filters, fuel, and a better understanding of fluid dynamics

Bioremediation, the study of using living organisms to remove pollutants or contaminants from the environment, is a hot new field of research.  Nanotechnology, including carbon nanotubes, nanoparticles, and nanomembranes is another extremely hot field, which promises to one day provide revolutionary improvements to nearly every field of science.  Combine the two fields and you get the University of Nottingham's new research.

Rather than just study nanofilters with nanopores or waste-eating bacteria, the English researchers at the University of Nottingham -- headed by Nidal Hilal, Professor of Chemical and Process Engineering in the Centre for Clean Water Technologies -- combined the two exciting fields to develop a new prototype system, which provides a glimpse at the potential future of water filtration.

The water enters the system and is first passed through colonies of bacteria, which eat contaminants.  The water then flows through an adjacent nanofilter, featuring pores, which are between ten thousandths of a millimeter to one nanometer thick. 

The work is similar to other research funded by the Middle East Desalination Research Centre on nanofiltration and ultrafiltration.  The goal is to be able to create pure, drinkable fresh water from sea water or water contaminated from industrial processes.

The key improvement in the Professor Hilal's system is the use of bacteria.  The bacteria eat the contaminates which prevent the filter from getting clogged and keep the water flowing.  The tech can thus be used in a closed system without the need for regular membrane replacement. 

The research is sponsored by a tech partnership with Cardev International, an oil filtration company based in Harrogate, England.

One fortunate benefit of the process is that the waste it generates in the form of contaminate-laden bacteria has a high calorific content, meaning that it makes an ideal fuel.  This could improve the efficiency of many types of industrial power generation. 

Another benefit of the research is by using state-of-the-art atomic force microscope equipment at the University, researchers are studying fluid movement at the nanoscale, which will allow for a better understanding of how liquids flow and pull apart at the nanoscale.  This could have broad applications in mechanical engineering, including improving oil flow and thus efficiency in automotive engines.  Researchers are testing liquids over a broad temperature range from -50 deg. C to 150 deg. C, which should help to yield a broad understanding of behavior.

Professor Hilal sees the research as unparalleled in terms of both the study of fluids at an atomic level and in providing a sustainable nanofiltration system.  He states proudly, "Examining the properties of liquids has never been done before at this scale.  By using bioremediation and nanofiltration technology combined, the water cleaning process is integrated — using far less energy than current processes. Add to this the recycling of waste products as fuels and you have a greener technology."



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RE: How?
By AnnihilatorX on 2/22/2008 12:07:05 PM , Rating: 2
For some strains of bacteria you can extract oil from them.
I wouldn't think they mean directly combusting them.

The word ideal means the fuel is green because the energy is generated from bacteria eating waste.


RE: How?
By JasonMick (blog) on 2/22/2008 12:15:02 PM , Rating: 2
Somewhat.

Its ideal in its "calorific content" meaning it has lots of energy in a small space. Caloric/calorific content is a key measure of how good a combustible fuel a resource would make/contains. Calorific content is why oil is a better fuel than carpet or the silicon in your pc -- aside from other chemistry involved, it simply contains more energy released during oxygen combustion reactions, hence why it burns so readily and nicely ("There Will Be Blood", anyone?).

The idea is that the waste material contains a lot of combustible material in a small space. If the excess bacteria could be harvested and this fuel extracted, it could easily be burned to produce substantial power.

The burn might not be green or "clean" as it would likely release carbon, just like any fossil fuel, but at least it would raise total efficiency of power generation, but squeezing a bit more energy out of power plant's waste.


RE: How?
By clovell on 2/22/2008 1:57:22 PM , Rating: 2
Very cool.


RE: How?
By drank12quartsstrohsbeer on 2/22/2008 3:49:07 PM , Rating: 2
Depending on the contaminant, burning the bacteria would just release the pollutants back into the environment.

The atricle doen't specify what types of pollutants could be used with this process.


RE: How?
By Xs1t0ry on 2/28/2008 7:06:27 PM , Rating: 2
Yeah, it's all about the caloric content. Every substance has one... things like fossil fuels just have higher caloric content. It's funny... if you drink gasoline you will get a temporary burst of energy (then die). They used to give it to cheap horses to carry heavy loads up hills because it was cheaper to replace them when they died at the top (gold rush era).


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