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Hyde, K., D. Peak, A. Schebel, S. Chomyshen, K. Bradshaw, S.D. Siciliano, et al.
RemTech 2019: Remediation Technologies Symposium, 16-18 October, Banff, 22 slides, 2019

As part of the Sustainable In Situ Remediation Cooperative Alliance, two experiments were conducted to test the passive anode-cathode technology (PACT) with different electron acceptors (EA) on the degradation of benzene in liquid media by anaerobic benzene-degrading microbial consortia. The first experiment tested the PACT with no EA, Fe3+, SO42-, and Fe3++ SO42-. The second experiment tested the PACT effect with NO3-+SO42-+Fe3+, PACT with no EA, no PACT with no EA, and no PACT with all EAs. Benzene degradation rates increased in the presence of the PACT and in particular, in treatments with high SO42-. The Fe3++ SO42- EA treatment showed the most benzene degradation. Gene sequencing analysis showed genera such as Geobacter, Thauera, and Thiobacillus, microbes capable of direct interspecies electron transfer. These transfer processes are the predicted reason for increased benzene degradation rates and unique benzene:EA ratios. As the area of influence of the PACT is limited, transitioning this work to the field will involve an in situ biostimulant solution that includes nano-sized graphite powder, SO42-, Fe3+, a nitrogen source, and phosphate. Longer abstract: Slides: More information about SIRCA research:

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