Stanford Researchers Developing Rocket-Powered Sewage Treatment System

this is a very misleading title, Rocket powered sewerage treatment, rather this is about 'sewerage powered rockets' since the byproduct of the bacteria which is breaking down the sewerage, Nitrous oxide, can later be used to power a rocket.

Nitrus can be used for many things, it is generally the propellant in food products that come in pressurized cans (whipped cream is an example). What about the non-gaseous by-product of the bacteria, those of us in the wastewater treatment field work dilligently to find new ways to dispose of the bulk of the waste -currently going into landfills or being burned in incinerators at great expense, or converted into soil conditioner by composting with wood chips, also expensive and not yet generally accepted by the general public -