A5065915537- Atmospheric and Environmental Gas Dynamics
- Hydraulic Fracturing and Reservoir Analysis
- Microplastics and Plastic Pollution
- Membrane Separation Technologies
- biodegradable polymer synthesis and properties
- Reservoir Engineering and Simulation Methods
- Groundwater flow and contamination studies
- Advanced Polymer Synthesis and Characterization
- Membrane-based Ion Separation Techniques
- Water Treatment and Disinfection
- Child Nutrition and Water Access
- Environmental Justice and Health Disparities
- Wastewater Treatment and Reuse
- Hydrocarbon exploration and reservoir analysis
- Analytical chemistry methods development
- Nanoparticles: synthesis and applications
- Polymer crystallization and properties
- Biofuel production and bioconversion
- Vibrio bacteria research studies
- Healthcare and Environmental Waste Management
- Pregnancy and Medication Impact
- Forensic Fingerprint Detection Methods
- Cyclone Separators and Fluid Dynamics
- Advanced Cellulose Research Studies
- Polymer composites and self-healing
University of Minnesota
2019-2025
Massachusetts Institute of Technology
2019-2024
Parsons (United States)
2021-2024
Twin Cities Orthopedics
2024
Grantmakers for Effective Organizations
2019-2021
Pennsylvania State University
2015-2019
University of Minnesota System
2019
McMaster University
2009
Abstract High molecular weight (10 6 –3 × 10 7 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, soil conditioner, viscosity modifier friction reducer both enhanced oil recovery high volume hydraulic fracturing. These applications of PAM can result significant environmental challenges, management contamination local supplies after accidental spills. This paper provides short review current PAM, including the potential for degradation by chemical,...
Polyacrylamide (PAM) based friction reducers are a primary ingredient of slickwater hydraulic fracturing fluids. Little is known regarding the fate these polymers under downhole conditions, which could have important environmental impacts including decisions on strategies for reuse or treatment flowback water. The objective this study was to evaluate chemical degradation high molecular weight PAM, effects shale, oxygen, temperature, pressure, and salinity. Data were obtained with fluid...
External reuse of shale gas flowback and produced water using the UF-RO process membrane fouling evaluation.
If challenges such as mechanical stability, scaling, biofouling and concentration polarization at high pressures are addressed, high-pressure RO could be used to efficiently remove water from high-salinity waste brines part of a zero-liquid-discharge disposal process.
Abstract Contamination from anthropogenic activities is a long-standing challenge to the sustainability of groundwater resources. Physically based (PB) models are often used in risk assessments, but their application large scale problems requiring high spatial resolution remains computationally intractable. Machine learning (ML) have emerged as an alternative PB era big data, necessary number observations may be impractical obtain when events rare, such episodic contamination incidents. The...
Health studies report associations between metrics of residential proximity to unconventional oil and gas (UOG) development adverse health endpoints. We investigated whether exposure through household groundwater is captured by existing a newly developed metric incorporating flow paths. compared with detection frequencies/concentrations 64 organic inorganic UOG-related chemicals/groups in from 255 homes (Pennsylvania n = 94 Ohio 161). Twenty-seven chemicals were detected ≥20% water samples...
The purpose of this work is to determine parameters for the design a Moringa seed sand filter water purification. oleifera seeds containing cationic antimicrobial proteins have been used as natural coagulants removal turbidity; however, low efficiency and high residual organic levels limit their applications. In work, extracts were reverse charge (f-sand) 10 mV at dosage 5.6 g seeds/m2 sand. This f-sand demonstrated ∼4 log 1 μm polystyrene particles >8 Escherichia coli compared <0.1 bare...
Abstract The rapid expansion of unconventional oil and gas development (UD), made possible by horizontal drilling hydraulic fracturing, has triggered concerns over groundwater contamination public health risks. To improve our understanding the risks posed UD, we develop a physically based, spatially explicit framework for evaluating well vulnerability to aqueous phase contaminants released from surface spills leaks at UD pad locations. proposed utilizes concept capture probability...
There is a growing concern that nanoplastic pollution may pose planetary threats to human and ecosystem health. However, quantitative mechanistic understanding of release via nanoscale mechanical degradation bulk plastics its interplay with photoweathering remains elusive. We developed lateral force microscope (LFM)-based nanoscratch method investigate mechanisms abrasive wear low-density polyethylene (LDPE) surfaces by single sand particle (simulated 300 nm tip) under environmentally...
Feed spacer biofouling is a major challenge in membrane processes such as nanofiltration and reverse osmosis. The bubbling of gas using air can be effective partially controlling biofouling, but additional chemical control still needed, pressurized systems difficult to integrate into existing systems. A simpler approach that combines both cleaning was developed here on the basis intermittently adding low concentration hydrogen peroxide (H2O2) feedwater. With periodic dosing (every 12 h) 0.3%...
Viral contamination of drinking water due to fecal is difficult detect and treat effectively, leading frequent outbreaks worldwide. The purpose this paper report on the molecular mechanism for unprecedented high virus removal from a practical sand filter. Sand filters functionalized using extract Moringa oleifera (MO) seeds, (f-sand) filters, achieved ∼7 log10 removal. These tests were conducted with MS2 bacteriophage, recognized surrogate pathogenic norovirus rotavirus. We studied since it...
Hydrogeologic transport contributes to limited organic chemical contamination in a region of intense gas extraction, even 10 years post-development.
Conflicting evidence exists as to whether or not unconventional oil and gas (UOG) development has enhanced methane transport into groundwater aquifers over the past 15 years. In this study, recent samples were collected from 90 domestic wells 4 springs in Northeastern Pennsylvania located above Marcellus Shale after more than a decade of UOG development. No statistically significant correlations observed between level various geospatial metrics, including proximity well violations, number...