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Our peer-reviewed paper (Energies 2020, 13, 4972;
doi:10.3390/en13184972) reports anaerobic digestion of biomass with
the methane/carbon dioxide mixture fed into an Allam Cycle power
plant produces electricity with zero emissions plus high pressure
pure CO2 ready for deep aquifer sequestration without additional
pressurizing. The income from the electricity, plus income from the
sequestered CO2, and potentially digestate sales, make this
economically interesting.
Hopefully, the digestate (if using pure food waste) can be sold as
a high quality fertilizer that can be used on organic and other
food crops and rangelands. If the organics are mixed with sewage
sludge or other impure wastes, the digestate could be used to
enrich shrublands and forests to increase natural sequestration. In
addition the digestate could be added as a liquid to other organics
in the composting process.
Such profitable use of biomass is essential, especially with the
requirement under SB 1383 to divert millions of tons of organic
wastes now going to landfills every year.
Hope CARB can model this opportunity for economical carbon negative
electricity. You may contact me for more information, references
and spreadsheets.