grease recovery rea systems

When the City of Danbury decided to renovate its wastewater treatment plant, it incorporated our FOG-To-Biodiesel system to eliminate the economic and environmental costs associated with landfilling and incinerating its FOG. The solution we proposed not only reduced their overall O&M costs, but created a new revenue stream from the monetization of this waste stream.

Our FOG-To-Biodiesel system produces premium-grade biodiesel (ASTM B100) from virtually any feedstock, including brown grease. This is a quantum leap in innovation, as all other attempts to produce B100 biodiesel from brown grease have failed.

For this project, we designed a FOG receiving facility to increase Danbury’s capacity to accept FOG waste trucked in from food-service establishments and other sources. Our Grease Recovery Units work in tandem with our decanting process to eliminate water content and prepare the FOG for conversion to biodiesel. Water separated in the decanting process is fed back into its wastewater treatment system, from where it discharges as effluent.

As a result of our FOG-To-Biodiesel technology, the City of Danbury is able to fuel its municipal fleets and reduce respective carbon emissions by up to 74%. Biodiesel not consumed by Danbury can be sold to local or regional fuel distributors for a considerable profit. Over the past 10 years, B100 biodiesel has been consistently more valuable than other alternative fuels.

Life-cycle analysis conducted by Argonne National Laboratory found emissions for B100 biodiesel to be 74% lower than those from petroleum diesel. The California Air Resources Board has also arrived at similar results for its life-cycle analysis of biodiesel.

fuel municipal operations rea systems
rea systems fog to biodisel school bus


Eliminates environmental and economic costs associated with FOG disposal
Creates new revenue stream from valorization of FOG
Addresses environmental-stewardship and decarbonization mandates that have become central to public policy