Found: Bacteria to clean arsenic spills

September 8th, 2008 - 12:04 pm ICT by IANS  

London, Sep 8 (IANS) Scientists have stumbled on a new bacteria that can clean up arsenic spills even in previously inhospitable terrains.The Giant Mine in Canada is in the sub-arctic region. The presence of over 230,000 tonnes of arsenic-containing dust makes it one of the most polluted places on earth, as well as one of the most inhospitable.

“Water seeps through the mine cracks carrying the arsenic with it as it drips down the walls,” said Thomas Osborne of University College London. “We discovered new types of bacteria living in biofilms on the walls of Giant Mine that consume arsenic compounds contained in the polluted water seeping through.”

Arsenic is toxic to all living cells, and in people causes fatal cancers of the lung, liver, kidney and bladder. It also causes cirrhosis and gangrene, and on a wider scale seriously damages wildlife in fragile environments.

Arsenic contamination is a global problem, with parts of India, Bangladesh, Vietnam, Mexico, Canada, Argentina and the US severely affected.

“Until now, no bacteria have ever been isolated that can thrive in cold temperatures and deal with arsenic contamination. The new bacteria we discovered function at temperatures between minus 20 degrees Celsius and four degrees C,” said Osborne.

“These bacteria also live in a community called a biofilm, which means that we can build them into a new system to clean up contaminated areas by removing the arsenic from soil or drinking water, even in the cold far north and south, or in winter.

“The other exciting possibility that this opens up is that we can isolate the enzyme from these new strains of bacteria and develop an arsenic biosensor to use in cold environments.

“This will warn when traces of arsenic are escaping from areas like mine workings, industrial chemical facilities, or even laboratories, alerting us before pollution manages to get into water courses or drinking water supplies. We could also use it to test newly drilled wells in countries like Bangladesh where water supplies are known to be contaminated.”

Many organisms, including all plants and animals, ultimately get their energy from the sun via photosynthesis. But over the last few decades scientists have discovered more and more microbes that can get their energy directly from breaking down chemical bonds.

This enables them to survive in extraordinary and dark environments such as deep inside the earth or at the bottom of the coldest, deepest oceans, where previously no life was expected to exist at all.

These findings were presented Monday at the Society for General Microbiology’s Autumn meeting being held this week at Trinity College, Dublin.

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