(253e) In-Situ Hydrogen Sulfide Removal and Biogas Upgrading Via a One-Reactor System Integrating Solid-State Anaerobic Digestion of Food Waste and Bioelectrochemical Treatment
AIChE Annual Meeting
Tuesday, November 12, 2019 - 10:05am to 10:30am
To fill in this knowledge gap, an innovative one-reactor system incorporating SSAD of FW and bioelectrochemical (BEC) treatment of leachate was studied. In the upper layer of this reactor, FW was hydrolyzed and VFAs were produced and washed down into the leachate. In the lower layer of reactor inserts the BEC unit. A pair of electrodes made of low carbon steel were submersed into the leachate and applied a voltage of 0.7 V, which secured the removal of most H2S with relatively less material consumption of electrodes and increased the buffering capacity of leachate. A cyclic flow of leachate was created so that the BEC-treated leachate with a stronger buffering capacity was pumped back to upper layer for a more thorough mass transfer of SSAD. Moreover, the biogas profile was upgraded since the BEC treatment contributed to the reduction of some CO2 to CH4. Consequently, in-situ H2S removal, biogas upgrading, and process stabilization were simultaneously achieved through this one-reactor design integrating SSAD of FW and BEC treatment of leachate.