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Adding Vinegar may Help Toxic Water to Clean Itself

by Tanya on March 06, 2009 at 10:28 AM General Health News

Engineers and environmental scientists at UK's University of Leeds are attempting to develop methods that enable the self-clean up of contaminated water with simple organic chemicals like vinegar.

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The harmful chromium compounds found in the groundwater at sites receiving waste from former textiles factories, smelters, and tanneries have been linked to cancer, and excessive exposure can lead to problems with the kidneys, liver, lungs and skin.

The research team, led by Dr Doug Stewart from the School of Civil Engineering and Dr Ian Burke from the School of Earth and Environment, has discovered that adding dilute acetic acid (vinegar) to the affected site stimulates the growth of naturally-occurring bacteria by providing an attractive food source.

In turn, these bacteria then cleanse the affected area by altering the chemical make-up of the chromium compounds to make them harmless.

"The original industrial processes changed these chemicals to become soluble, which means they can easily leach into the groundwater and make it unsafe," said Dr Burke.

"Our treatment method reconverts the oxidised chromate to a non-soluble state, which means it can be left safely in the ground without risk to the environment. As it is no longer 'bio-available', it doesn't present any risk to the surrounding ecosystem," he added.

Chromate chemicals have previously been successfully treated in situ in neutral Ph conditions, but this study is unique in that it concentrates on extremely alkaline conditions, which are potentially much more difficult to treat.

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Adding Vinegar may Help Toxic Water to Clean Itself

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