A5066567292- Groundwater flow and contamination studies
- Environmental remediation with nanomaterials
- Electrokinetic Soil Remediation Techniques
- Per- and polyfluoroalkyl substances research
- Groundwater and Isotope Geochemistry
- Enhanced Oil Recovery Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Arsenic contamination and mitigation
- Urban Heat Island Mitigation
- Coastal and Marine Dynamics
- Toxic Organic Pollutants Impact
- Nanopore and Nanochannel Transport Studies
- Hydrocarbon exploration and reservoir analysis
- Atmospheric chemistry and aerosols
- Geophysical and Geoelectrical Methods
- Nanoparticles: synthesis and applications
- Nanomaterials for catalytic reactions
- Marine and coastal ecosystems
- Fecal contamination and water quality
- Microbial Community Ecology and Physiology
- Soil and Unsaturated Flow
- Electrostatics and Colloid Interactions
- Water Treatment and Disinfection
- Wastewater Treatment and Nitrogen Removal
- CO2 Sequestration and Geologic Interactions
UNSW Sydney
2016-2025
Manly Hospital
2015-2024
Sydney Water
2019-2023
Western University
2012-2023
Queen's University
2023
University of Toronto
2005-2023
Australian Government
2022
Australian Nuclear Science and Technology Organisation
2022
Royal Military College of Canada
2022
WRc (United Kingdom)
2021
Abstract Climate change and urbanization can increase pressures on groundwater resources, but little is known about how quality will change. Here, we use a global synthesis ( n = 9,404) to reveal the drivers of dissolved organic carbon (DOC), which an important component water chemistry substrate for microorganisms that control biogeochemical reactions. Dissolved inorganic chemistry, local climate land explained ~ 31% observed variability in DOC, whilst aquifer age additional 16%. We...
Groundwater comprises 95% of the liquid fresh water on Earth and contains a diverse mix dissolved organic matter (DOM) molecules which play significant role in global carbon cycle. Currently, storage times degradation pathways groundwater DOM are unclear, preventing an accurate estimate sources sinks for budgets. Here we reveal transformations aging using ultra-high resolution mass spectrometry combined with radiocarbon dating. Long-term anoxia lack photodegradation leads to removal oxidised...
Abstract Per- and polyfluoroalkyl substances (PFAS) are a class of fluorinated chemicals used widely in consumer industrial products. Their human toxicity ecosystem impacts have received extensive public, scientific regulatory attention. Regulatory PFAS guidance is rapidly evolving, with the inclusion wider range included advisories continued decrease what deemed safe concentrations. In this study we collated concentration data for over 45,000 surface groundwater samples from around world to...
Engineered multiwalled carbon nanotubes (MWCNTs) are the subject of intense research and expected to gain widespread usage in a broad variety commercial products. However, concerns have been raised regarding potential environmental human health risks. The mobility MWCNTs porous media is examined this study using one-dimensional flow-through column experiments under conditions representative subsurface drinking water treatment systems. Results demonstrate that pore velocity strongly...
Nanoparticles possess unique physical, electrical, and chemical properties which make them attractive for use in a wide range of consumer products. Through their manufacturing, usage, eventual disposal, nanoparticles are expected to ultimately be released the environment after point they may pose environmental human health risks. One critical component understanding modeling those potential risks is transport subsurface environment. This study investigates mobility one important nanoparticle...
Nanoscale zerovalent iron (nZVI) particles were injected into a contaminated sandy subsurface area in Sarnia, Ontario. The nZVI was synthesized on site, creating slurry of 1 g/L nanoparticles using the chemical precipitation method with sodium borohydride (NaBH4) as reductant presence 0.8% wt. carboxymethylcellulose (CMC) polymer to form stable suspension. Individual formed during synthesis had transmission electron microscopy (TEM) quantified particle size 86.0 nm and dynamic light...
Nanoscale zerovalent iron (nZVI) is an emerging technology for the remediation of contaminated sites. However, there are concerns related to impact nZVI on in situ microbial communities. In this study, community composition at a site was monitored over two years following injection stabilized with carboxymethyl cellulose (nZVI–CMC). Enhanced dechlorination chlorinated ethenes nontoxic ethene observed long after expected oxidation. The abundance Dehalococcoides (Dhc) and vinyl chloride...
1,2-Dichloroethane (1,2-DCA) is a chlorinated solvent classified as probable human carcinogen. Due to its extensive use in industrial applications, widespread contamination, and recalcitrance toward abiotic dechlorination, 1,2-DCA remains challenging compound for the remediation community. Over past decade, nano zerovalent iron (nZVI) has been efficiently used treat many of compounds concern. However, thus far, even nZVI (monometallic or bimetallic) unable dechlorinate 1,2-DCA. Therefore, an...
Dissolved organic matter (DOM) in groundwater is fundamentally important with respect to biogeochemical reactions, global carbon cycling, heavy metal transport, water treatability and potability. One source of DOM from the transport vadose zone by rainfall recharge. Changes precipitation patterns associated natural climate variability change are expected alter load character released these areas, which ultimately impacts on quality treatability. In order investigate potential changes after...
Urban greening can potentially help mitigate heat-related mortality and flooding facing the >4 billion urban population worldwide. However, geographical variation of relative combined hydrological thermal performance benefits such interventions are unknown. Here we quantify globally, using a model, how climate-driven trade-offs exist between retention cooling potential as green roofs parks. Using Budyko framework, show that water generally increases with aridity in water-limited...
The polyfluorinated alkyl substance 6:2 fluorotelomer sulfonate (6:2 FTS) has been detected in diverse environments impacted by aqueous film-forming foams used for firefighting. In this study, a bacterial strain (J3) using FTS as sulfur source was isolated from landfill leachate previously exposed to polyfluoroalkyl substances New South Wales, Australia. Strain J3 shares 99.9% similarity with the 16S rRNA gene of Dietzia aurantiaca CCUG 35676T. Genome sequencing yielded draft genome sequence...
Nanoscale zerovalent iron (nZVI) particles have significant potential to remediate contaminated source zones. However, the transport of these through porous media is not well understood, especially at field scale. This paper describes simulation a injection carboxylmethyl cellulose (CMC) stabilized nZVI using 3D compositional simulator, modified include colloidal filtration theory (CFT). The model includes composition dependent viscosity and spatially temporally variable velocity,...
A pilot scale injection of nanoscale zerovalent iron (nZVI) stabilized with carboxymethyl cellulose (CMC) was performed at an active field site contaminated a range chlorinated volatile organic compounds (cVOC). The cVOC concentrations and microbial populations were monitored the before after nZVI injection. remedial successfully reduced parent compound on site. period abiotic degradation followed by enhanced biotic degradation. Results suggest that nZVI/CMC created conditions stimulated...