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Brian Westenhaus

Brian Westenhaus

Brian is the editor of the popular energy technology site New Energy and Fuel. The site’s mission is to inform, stimulate, amuse and abuse the…

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Sewage: The Next Renewable Energy Breakthrough?

  • Washington State University researchers have discovered a new way to treat sewage to create natural gas.
  • They found that they were able to convert more than 85% of the organic material to biogas.
  • Circular sewage processes look to be ahead of trash disposal and this team’s research has closed the gap even further.

Washington State University has announced a new method to treat sewage can efficiently convert leftover sludge to biogas, an advance that could help communities lower their waste treatment costs while helping the environment.

Reporting in the journal, Waste Management, a Washington State University research team tested a pretreatment technology, adding an extra step to typical treatments and using oxygen-containing high pressure steam to break down sewage sludge. They found that they were able to convert more than 85% of the organic material to biogas, which can be used to produce electricity or upgraded to renewable natural gas (RNG) for the natural gas grid or for local use.

Adding the new pretreatment step improves the anaerobic conversion of sewage sludge at the wastewater treatment facility from the current less-than-50% conversion rate, and they produced 98% more methane overall compared to current practice.

Birgitte Ahring, professor in the Gene and Linda Voiland School of Chemical Engineering and Bioengineering, who led the work said, “It was shown to be extremely efficient, and that’s very exciting. This can be applicable and something we could begin to explore in Washington state. Not wasting waste but using its potential instead has major advantages.”

Sewage sludge is not a sought-after product. About half of the wastewater treatment plants in the U.S. use anaerobic digestion to reduce this waste, but the process, in which microbes break down the waste, is inefficient. The leftover sludge, called biosolids, generally ends up in landfills.

Wastewater treatment facilities also use large amounts of electricity to clean up municipal wastewater. They are often the largest user of electricity in a small community.

Ahring, who is also a faculty member in the Bioproducts, Sciences, and Engineering Laboratory at WSU Tri-cities added, “If they could make their own electricity or for some of the large plants, make renewable natural gas and add it to the natural gas grid, then they can reduce the use of fossil fuels. Here we are beginning to move into the idea of the circular economy.”

For their study, the WSU research team treated the sludge at high temperature and pressure with oxygen added before the anaerobic digestion process. The small amount of oxygen under the high-pressure conditions acts as a catalyst breaks down the polymers in the material.

The WSU researchers have been studying this pretreatment process for several years, using it to break down straw and woody materials. They weren’t sure the process would work with the different composition of sewage sludge, such as lipids and proteins, but were positively surprised.

“This is not a very high-tech solution,” Ahring said. “It’s actually a solution that can be useful even at small scale. The efficiency has to be high or else you cannot warrant adding the extra costs to the process.”

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The technology could be particularly helpful for smaller communities, many of which are motivated to reduce waste and their climate impact, she added.

The WSU team is working with Clean-Vantage, a Richland-based clean technology start-up company active in the pretreatment area, as well as with Pacific Northwest National Laboratory (PNNL), which is doing a techno-economic analysis of the new process.

The researchers are now scaling up the work in their pilot facility located at WSU Tri-cities to further demonstrate the process. They are also studying how to efficiently convert the biogas to more valuable renewable natural gas by a new bioprocess. While the biogas can be used to produce electricity, producing renewable natural gas could allow rural communities to produce local transportation fuel for fueling their municipal vehicles.

***

The idea that trash disposal is as simple as dig a hole and throw the garbage in has to be updated to a circular economy. Its amazing what folks will flush down the toilet and grind up in the disposer under the sink.

But most folks just want those materials away from them.

Circular sewage processes look to be ahead of trash disposal and this team’s research has closed the gap even further.

Imagine all your sewage and trash had to be disposed of on your property. There would soon be a market for specialized removal. If there was a porta potty at every home folks would much more careful what when in and how often it had to be serviced.

This team’s work is important. Perhaps there is quite an academic future in sewage, garbage and trash disposal into a circular economy.

By Brian Westenhaus via New Energy and Fuel

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