A5090596417- Per- and polyfluoroalkyl substances research
- Toxic Organic Pollutants Impact
- Atmospheric chemistry and aerosols
- Wastewater Treatment and Nitrogen Removal
- Enzyme-mediated dye degradation
- Analytical chemistry methods development
- Water Systems and Optimization
- Water resources management and optimization
- Water Treatment and Disinfection
- Microbial Fuel Cells and Bioremediation
- Water-Energy-Food Nexus Studies
- Air Quality and Health Impacts
- Tracheal and airway disorders
- Modular Robots and Swarm Intelligence
- Chemical Analysis and Environmental Impact
University of California, Berkeley
2022-2025
Sites impacted by aqueous film-forming foam (AFFF) contain co-contaminants that can stimulate biotransformation of polyfluoroalkyl substances. Here, we compare how microbial enrichments from AFFF-impacted soil amended with diethyl glycol monobutyl ether (found in AFFF), aromatic hydrocarbons (present co-released fuels), acetate, and methane (substrates used or formed during bioremediation) impact the aerobic an AFFF-derived six-carbon electrochemical fluorination (ECF) precursor N-dimethyl...
Per- and polyfluoroalkyl substances (PFASs) are a class of synthetic, organic chemicals that contaminate drinking water natural ecosystems. PFAS source apportionment is challenging because there many sources, standard analytical methods quantify fewer than 100 the thousands PFASs in commerce. The total oxidizable precursor (TOP) assay augments number can be quantified increasingly incorporated into routine site investigation. Here we examine ability TOP to identify including aqueous...
Despite the fact that thousands of perfluoroalkyl and polyfluoroalkyl substances (PFASs) are in widespread commercial use, analytical methods capable quantifying them environmental samples available for less than 100 compounds. The total oxidizable precursor (TOP) assay provides a means unknown PFASs by oxidizing into carboxylates (PFCAs), which readily measured liquid chromatography–tandem mass spectrometry. To improve reproducibility TOP assay, [13C8] perfluorooctane sulfonamide was added...
Fungi and laccase mediator systems (LMSs) have a proven track record of oxidizing recalcitrant organic compounds. There has been considerable interest in applying LMSs to the treatment perfluoroalkyl acids (PFAAs), class ubiquitous persistent environmental contaminants. Some laboratory experiments indicated modest losses PFAAs over extended periods, but there no clear demonstrations transformation mechanism or kinetics that would be needed for remediation applications. We set out determine...
Perfluoroalkyl acid (PFAA) precursors are a diverse subclass of per- and polyfluoroalkyl substances (PFASs) that can be transformed into PFAAs public health concern. Unlike strongly acidic PFAAs, anionic, cationic, neutral, or zwitterionic. Precursor charge affects the environmental fate, but existing quantification techniques struggle to ascertain abundance compounds within each group. To fill this gap, we developed validated solid-phase extraction procedure separates by quantifies sum in...
Despite the prevalence of nitrate reduction in groundwater, biotransformation per- and polyfluoroalkyl substances (PFAS) under nitrate-reducing conditions remains mostly unknown compared with aerobic or strong reducing conditions. We constructed microcosms to simulate occurring at groundwater sites impacted by aqueous film-forming foams (AFFFs). investigated 6:2 fluorotelomer thioether amido sulfonate (6:2 FtTAoS), a principal PFAS constituent several AFFF formulations using both...
Per- and polyfluoroalkyl substances (PFASs) from aqueous film forming foams (AFFFs) can hinder bioremediation of co-contaminants such as trichloroethene (TCE) benzene, toluene, ethylbenzene, xylene (BTEX). Anaerobic dechlorination require bioaugmentation Dehalococcoides, for BTEX, oxygen is often sparged to stimulate in situ aerobic biodegradation. We tested PFAS inhibition TCE BTEX by exposing an anaerobic TCE-dechlorinating coculture, BTEX-degrading enrichment culture, toluene-degrading...
Anaerobic ammonium oxidizing (anammox) bacteria are utilized for high efficiency nitrogen removal from nitrogen-laden sidestreams in wastewater treatment plants. The anammox form a variety of competitive and mutualistic interactions with heterotrophic that often employ denitrification or dissimilatory nitrate reduction to (DNRA) energy generation. These can be heavily influenced by the influent ratio nitrite, NH 4 + :NO 2 − , where deviations widely acknowledged stoichiometric (1:1.32) have...
Changing climate threatens our water systems: Droughts, fires, and floods disrupt access to safe no country is immune. The aging infrastructure crisis offers an opportunity build resiliency into future systems with approaches like (non-)potable reuse. Such strategies require participation by end-users, which we propose can be championed utilities through: (1) Raising awareness of challenges, (2) education about current realities opportunities, (3) providing resources implement sustain solutions.