Microbes with a taste for toxic waste may hold the solution to cleaning
up contaminated industrial sites and poisoned waterways across the
globe, saving billions of dollars in cleanup bills, an Australian
scientist said. Microbes found in old waste sites in Australia not only
tolerate lethal soil and water cocktails created by waste petroleum and
chlorine, but can break them down so they no longer threaten humans, the
scientist said on Friday.
"We have isolated bacteria which can live on those waste compounds,"
Megha Mallavarapu, from a government-backed environmental research
centre based in South Australia state, told Reuters.
"We are enhancing the microbes present," Mallavarapu said, adding the
altered bacteria were able to break down toxins faster. Industrial
contamination, he said, was one of the greatest threats facing societies
world-wide, with Australia alone facing a A$5 billion (US$3.8 billion)
cleanup bill.
"Anywhere there has been a fuel dump, a munitions store, an old chemical
factory or heavy manufacturing plant, there is potential for toxic
substances to leak into groundwater underneath," said Mallavarapu.
The researchers said there were millions of toxic dumps scattered
through Asia, with waste from the regions mega cities often pouring
untreated into waterways meant to be lifelines for nearby communities.
The centre, set up to develop and export new ways to repair ravaged
environments, said it was training researchers in Bangladesh, India,
China and South Korea to deal with the problem.
But Mallavarapu said there was no single super-bug or solution,
especially in heavily contaminated sites. He said scientists first had
to look for new types of bacteria and enhance them, or provide oxygen or
food to lift their numbers.
"It depends on the nature of the contaminant at each particular site,"
he said. "Sometimes we have to help nature." (US$1 = A$1.31)
(
Planet Ark, 11/09/2006)