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Asef Redwan
Asef Redwan

PhD Candidate
Texas Tech University

I am a Ph.D. candidate at Dr. Kayleigh Millerick lab in Texas Tech University (TTU), and will be defending my dissertation in this Spring 2021 term. My focus area is Applied Environmental Microbiology. In my Ph.D. project, I am investigating factors influencing microbially-mediated redox transformation reactions by semi-conductive materials (activated carbon, ZVI) for enhanced bioremediation. I have completed my Masters in Environmental Engineering from TTU at 2017. Before joining TTU, I graduated from Bangladesh University of Engineering and Technology.


Biologically sulfidated Fe(0) materials promote abiotic trichloroethene dechlorination while minimally influencing indigenous sulfate-reducing communities

Zero valent iron (ZVI) particles facilitate abiotic degradation of chlorinated ethenes, including trichloroethene (TCE), but ZVI reactions can be non-specific and negatively influence native microbial communities. The objectives of this work are to: i) Examine ZVI behavior in the presence of an indigenous sulfate-reducing enrichment (AMR-1) and ii) Compare behavior of AMR-1 in the presence of unsulfidated and surface-sulfidated nanoscale ZVI particles (S-nZVI). Results show that AMR-1 generated dissolved sulfide species that, when added to ZVI postsynthesis, formed S-nZVI particles and attained TCE degradation results consistent with chemical sulfidation of ZVI. AMR-1 exposed to surface-sulfidated ZVI particles showed limited methanogenic enrichment and community composition more consistent with the baseline enrichment, compared to AMR-1 cultures exposed to unsulfidated ZVI. High particle reactivity with minimal disruption to AMR-1 community structure suggest that ZVI particles sulfidated in situ are a promising technology for TCE remediation.

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