![Steam. Pressure. Oxygen. And Presto — More Biogas.](https://cole-tpomag.imgix.net/https%3A%2F%2Fwww.tpomag.com%2Fuploads%2Fimages%2F200328_birgitte_-fermentation_reactor_11.jpg?crop=focalpoint&fit=crop&fp-x=0.5&fp-y=0.5&h=620&ixlib=php-1.1.0&q=75&w=1024&s=3e8e466f673f543e16f970de4e90642b)
Birgitte Ahring, Ph.D., with the biodigesters used in her pilot project for pretreating wastewater treatment solids with steam and pressure.
A pilot project significantly boosted biogas yield by pretreating biosolids with steam, pressure and oxygen before anaerobic digestion.
The process converted 80-85% of the organic material to biogas, versus the typical 50% without pretreatment, says Birgitte Ahring, Ph.D., a...