A5004025009- Microbial Fuel Cells and Bioremediation
- Chemical Analysis and Environmental Impact
- Water Treatment and Disinfection
- Wastewater Treatment and Nitrogen Removal
- Selenium in Biological Systems
- Environmental remediation with nanomaterials
- Microbial bioremediation and biosurfactants
- Per- and polyfluoroalkyl substances research
- Plasma Applications and Diagnostics
- Membrane Separation Technologies
- Ammonia Synthesis and Nitrogen Reduction
- Mercury impact and mitigation studies
- Methane Hydrates and Related Phenomena
- Radioactive element chemistry and processing
- Electrochemical Analysis and Applications
- Chemical Reactions and Isotopes
- Groundwater flow and contamination studies
- Microbial Metabolic Engineering and Bioproduction
- Membrane-based Ion Separation Techniques
- Chromium effects and bioremediation
- Arsenic contamination and mitigation
- Heavy metals in environment
- Surface Modification and Superhydrophobicity
- Lattice Boltzmann Simulation Studies
- Plasma Diagnostics and Applications
Florida A&M University - Florida State University College of Engineering
2015-2024
Florida State University
2015-2023
University of Illinois Urbana-Champaign
2005-2015
Florida Agricultural and Mechanical University
2015
Arizona State University
2010-2014
We studied the microbial functional and structural interactions between nitrate (NO(3)(-)) perchlorate (ClO(4)(-)) reductions in hydrogen (H(2))-based membrane biofilm reactor (MBfR). When H(2) was not limiting, ClO(4)(-) NO(3)(-) were complete, MBfR's composed mainly of bacteria from ε- β-proteobacteria classes, with autotrophic genera Sulfuricurvum, Hydrogenophaga, Dechloromonas dominating biofilm. Based on functional-gene pyrosequencing assays, played most important role reduction, while...
For the first time, we demonstrate chromate (Cr(VI)) bioreduction using methane (CH4) as sole electron donor in a membrane biofilm reactor (MBfR). The experiments were divided into five stages lasting total of 90 days, and each stage achieved steady state for at least 15 days. Due to continued acclimation microbial community, Cr(VI)-reducing capacity kept increasing. Cr(VI) removal end 90-day test reached 95% an influent concentration 3 mg Cr/L surface loading 0.37g Cr m–2 day–1. Meiothermus...
Selenate (SeO4(2-)) bioreduction is possible with oxidation of a range organic or inorganic electron donors, but it never has been reported methane gas (CH4) as the donor. In this study, we achieved complete SeO4(2-) in membrane biofilm reactor (MBfR) using CH4 sole added The introduction nitrate (NO3(-)) slightly inhibited reduction, two oxyanions were simultaneously reduced, even when supply rate was limited. main SeO4(2-)-reduction product nanospherical Se(0), which identified by scanning...
To study the effect of nitrate (NO3(-)) on selenate (SeO4(2-)) reduction, we tested a H2-based biofilm with range influent NO3(-) loadings. When SeO4(2-) was only electron acceptor (stage 1), 40% reduced to insoluble elemental selenium (Se(0)). reduction dramatically inhibited when added at surface loading larger than 1.14 g N m(-2) day(-1), H2 delivery became limiting and 80% input 2). In stage 3, again removed from influent, re-established increased 60% conversion Se(0). remained stable in...
We evaluated a strategy for achieving complete reduction of perchlorate (ClO(4)(-)) in the presence much higher concentrations sulfate (SO(4)(2-)) and nitrate (NO(3)(-)) hydrogen-based membrane biofilm reactor (MBfR). Full ClO(4)(-) was achieved by using two-stage MBfR with controlled NO(3)(-) surface loadings to each stage. With an equivalent loading larger than 0.65 ± 0.04 g N/m(2)-day, lead removed about 87 4% 30 8% ClO(4)(-). This decreased 0.34 0.04-0.53 0.03 N/m(2)-day lag MBfR, which...
[1] This work presents a pore-scale biofilm model that solves the flow field using lattice Boltzmann method, concentration of chemical species finite difference and development cellular automaton method. We adapt from previous expand it by implementing shrinkage in The new is then evaluated against previously published experiment, which two microfluidic cells, one with homogeneous pore network other an aggregate network, were tested for aerobic degradation herbicide. simulated distribution...
1,1,1-Trichloroethane (1,1,1-TCA) and trichloroethene (TCE) are common recalcitrant contaminants that coexist in groundwater. H2-induced reduction over precious-metal catalysts has proven advantageous, but its application to long-term continuous treatment been limited due poor H2-transfer efficiency catalyst loss. Furthermore, catalytic reductions of aqueous 1,1,1-TCA alone or concomitant with TCE co-reductions unstudied. Here, we investigated co-reduction using palladium nanoparticle (PdNP)...
To investigate interactions among multiple electron acceptors in a H2-fed biofilm, we operated membrane biofilm reactor with H2-delivery capacity sufficient to reduce all acceptors. ClO4– and O2 were input stages at surface loadings of 0.08 ± 0.006 g/m2-d (1.0 0.7 e– meq/m2-d) for 0.51 (76 O2. SO42– was added Stage 2 3.77 0.39 (331 34 meq/m2-d), NO3– further 3 0.72 0.03 g N/m2-d (312 13 meq/m2-d). At steady state each stage, ClO4–, O2, (when present the influent) completely reduced; measured...
A multispecies biofilm model is developed for simultaneous reduction of nitrate and perchlorate in the H(2)-based membrane reactor. The one-dimension includes dual-substrate Monod kinetics a steady-state with five solid dissolved components. components are autotrophic denitrifying bacteria, perchlorate-reducing heterotrophic inert biomass, extracellular polymeric substances (EPS). nitrate, perchlorate, hydrogen (H(2)), substrate-utilization-associated products, biomass-associated products...
Anaerobic treatment of dilute wastewater (e.g., municipal sewage) is promising due to energy recovery and lessened operating costs, both which can significantly improve the sustainability management over traditional activated sludge treatment. Discharge dissolved methane lack nitrogen removal are challenges for widespread adoption anaerobic oxidation coupled denitrification (AOM-D) overcome in a complementary way, thus preserving benefits wastewater. This review first presents principles...
Groundwater co-contaminated with 1,4-dioxane, 1,1,1-trichloroethane (TCA), and trichloroethene (TCE) is among the most urgent environmental concerns of U.S. Department Defense (DoD), Environmental Protection Agency (EPA), industries related to chlorinated solvents. Inspired by pressing need remove all three contaminants at many sites, we tested a synergistic platform: catalytic reduction 1,1,1-TCA TCE ethane in H2-based membrane palladium-film reactor (H2-MPfR), followed aerobic...
Denitrification-driven Fe(II) oxidation is an important microbial metabolism that connects iron and nitrogen cycling in the environment. The formation of Fe(III) minerals periplasmic space has a significant effect on electron transfer, but direct evidence ions entering periplasm resulting mineral precipitation conduction properties yet to be conclusively determined. Here, we investigated pathways amounts iron, with different valence states morphologies, denitrifier Pseudomonas sp. JM-7 (P....