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Abstract

An eFuels plant and process for producing synthetic hydrocarbons using renewable energy are disclosed. The eFuels plant comprises a hydrocarbon synthesis (HS) system and a renewable feed and carbon/energy recovery (RFCER) system. A process for treating wastewater in the eFuels production system comprises adding wastewater streams from the HS system to an anaerobic buffer tank to produce an inventory of untreated wastewater. The relative amounts of the HS system wastewater streams are controlled such that the inventory of untreated wastewater has a target chemical oxygen demand (COD) and/or a target biochemical oxygen demand (BOD). A first amount of the inventory of untreated water is added to an anaerobic biodigester to produce a first treated water stream and a biogas stream, and a second amount of the inventory of untreated water and the first treated water stream are added to an aerobic buffer tank to produce an inventory of aerobic feed water. The relative amounts of the first treated water and the untreated water added to the aerobic buffer tank such that the inventory of aerobic feed water are controlled such that the inventory of aerobic feed water has a target COD and/or a target BOD. A portion of the inventory of aerobic feed and an amount of air to an aerobic biodigester to produce a second treated water stream and a first sludge.

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First Claim