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Solving the stink from sewers
Date:9/21/2012

The rotten egg gas leaking from sewer pipes and costing billions of dollars worldwide in odour control may soon be far less of a problem thanks to new research discussed at the 2012 International Water Association (IWA) conference this week.

Trials with a magic mix of chemicals, called Cloevis, on sewers in the Gold Coast region in Australia stopped 99 per cent of the rotten egg gas or hydrogen sulphide emitted from these pipes.

Lead researcher, Professor Zhiguo Yuan from the University of Queensland, told IWA delegates that one week after dosing for a few hours, in most cases the gas level increased to less than one fifth of its emissions prior to the treatment, and this has been repeatedly observed over a period of five months.

"We are currently looking to commercialise Cloevis and are doing a further four trials of the mix in the US and Canada," Professor Yuan says. "Our partners over there are very excited by Cloevis' potential".

The gases causing the bad smells in sewers also play a role in corroding sewer pipes, which is another costly problem especially in warm climates.

Professor Yuan's team, involving active participation from key members of Australia's water industry, is also working on corrosion issues and have another study into chemical free methods for managing hydrogen sulphide gas.

"We have done some trials with oxygenation of sewage using an electrochemical method which has reduced hydrogen sulphide enormously," he says. "We probably won't stop all bad smells from sewers forever but we're well on the way to reducing their extent."

Other speakers at the IWA conference spoke about managing bad smells from sewers and wastewater drains once they had escaped. Dr Valentina Lazarova from France reported on trials on the strong smells coming from the Oued El Harrach River in Algiers. Her team used jasmine-smelling micro sprays on the highway crossing the river and gels on pedestrian brid
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Contact: Jenni Metcalfe, Econnect Communication
jenni@econnect.com.au
61-408-551-866
Econnect Communication Pty Ltd.
Source:Eurekalert

Page: 1 2

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