Instead, unwanted food is donated or sent to anaerobic digestion plants to convert the material into biogas.
The system also works better than an alternative approach to creating electricity from wastewater, based on anaerobic digestion that produces methane.
The method uses biogas, which is produced when waste water sludge is broken down by microbes in a process known as anaerobic digestion.
We have used anaerobic digestion to treat sewage over 100 years.
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Harvest Power is currently in the process of building two large anaerobic digestion facilities, one in Richmond, outside Vancouver, Canada and the other in London, Ontario.
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The brothers power their farm and cheese factory using an anaerobic digestion system, which turns organic waste into fuel, and cuts down on greenhouse gas emissions.
Glendullan is to have a new bio-power plant for anaerobic digestion of distillery waste, and there is to be a new still-house at Mortlach distillery in Dufftown.
He said it was possible to reach a 25% renewable energy target but would need anaerobic digestion to get beyond this, something that could result in an 10% increase in bills by 2020.
Using so-called anaerobic digestion, ExoGen aims to make wastewater treatment for industry and agriculture much more efficient by creating a significant amount of energy throwing off electrons and methane gas during the treatment process that partially offsets the energy required to treat the wastewater.
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The answer that B9 is proposing is a coastal cargo ship that combines massive carbon-fibre DynaRig sails - such as those used on the superyacht, the Maltese Falcon - with an engine that runs on bio-gas made from food waste using a process called anaerobic digestion.
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