Bioelectrocatalyzed Nitrogen Fixation under Standard Conditions
Technical Report,01 Oct 2014,30 Sep 2016
Fulcrum Bioscience Salt Lake City United States
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Report developed under topic A13A-T007, contract W911NF-14-C0162. This final report describes the development of a bioelectrocatalyzed nitrogen fixation process using algae biofilm electrodes. The Phase II effort included Algae biofilm testing of lifetime and robustness, isolation and investigation of nitrogenase, nitritenitrate reductase enzymes, electrochemical stimulation of algae, electrolyte concentration and cation identity, process scale-up, ammonia separation, in-situ ammonia generation, studies on the nitrogen fixation method in algae including modelling and cost modelling of the process. The process achieved 16 uM ammonia at 8 coulombic efficiency in a 400mL volume. Ammonia separation without additional chemicals reached 90 efficiency. The process was scaled from 20 cm2 to 200 cm2.Results suggest that the process is viable for a small-scale industrial process, tonsday, with further improvements. Potential applications include distributed commodity chemical manufacturing for fuel, propellants and fertilizer.