Converting biogas into electricity

"The organic material in that waste can be broken down to produce biogas rich in methane.

Wastewater contains concentrated amounts of nitrogen that can lead toxic algae blooms and oxygen depletion or dead zones if it enters natural waterways. Most wastewater treatment facilities use ethanol for nitrogen removal, costing millions of dollars each year.

Dr Hu said this expensive process used up almost half the organic matter in the waste, meaning less was available for conversion to methane. "The new technology we are developing can recover more methane without requiring ethanol to be used to remove nitrogen," he said. "This also means we can recover almost all of the organic matter in the wastewater to produce even more biogas."

Thanks to a $300,000 Advance Queensland Research Fellowship, Dr Hu can upscale his work, with potential for it to be implemented in many more wastewater facilities. "We expect this technology will be rapidly adopted," he said. "It means the energy-intensive water treatment industry can go from big energy consumers to being energy neutral.

"It would save hundreds of thousands of dollars for large facilities and it is more sustainable for the planet." Dr Hu said his research with Queensland Urban Utilities since 2011 had enabled him to get insight from operators and to work translate laboratory research to 1.2 kilometres of piping at Luggage Point.