A5045123804- Water Treatment and Disinfection
- Advanced oxidation water treatment
- Environmental Chemistry and Analysis
- Wastewater Treatment and Nitrogen Removal
- Wastewater Treatment and Reuse
- Chemical Analysis and Environmental Impact
- Water Systems and Optimization
- Environmental remediation with nanomaterials
- Urban Stormwater Management Solutions
- Legionella and Acanthamoeba research
- Fecal contamination and water quality
- Membrane Separation Technologies
- Pharmaceutical and Antibiotic Environmental Impacts
- Toxic Organic Pollutants Impact
- Water Quality Monitoring and Analysis
- Marine and coastal ecosystems
- Atmospheric chemistry and aerosols
- Carbon Dioxide Capture Technologies
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Industrial Gas Emission Control
- Odor and Emission Control Technologies
- Marine Toxins and Detection Methods
- Listeria monocytogenes in Food Safety
- Membrane-based Ion Separation Techniques
Stanford University
2016-2025
University of South Carolina
2025
Hong Kong University of Science and Technology
2025
University of Hong Kong
2025
Zhejiang University
2025
Shenzhen University
2025
Soochow University
2025
Chinese Academy of Sciences
2025
Nanjing University
2025
Harbin Institute of Technology
2025
The effect of halides on organic contaminant destruction efficiency was compared for UV/H2O2 and UV/S2O8(2-) AOP treatments saline waters; benzoic acid, 3-cyclohexene-1-carboxylic cyclohexanecarboxylic acid were used as models aromatic, alkene, alkane constituents naphthenic acids in oil-field waters. In model freshwater, degradation higher by because the quantum S2O8(2-) than H2O2 photolysis. conversion (•)OH SO4(•-) radicals to less reactive halogen presence seawater reduced acid. more...
Advanced oxidation processes (AOPs) generating nonselective hydroxyl radicals (HO*) provide a broad-spectrum contaminant destruction option for the decontamination of waters. Halide ions are scavengers HO* during AOP treatment, such that treatment saline waters would be anticipated to ineffective. However, scavenging by halides converts radical reactive halogen species (RHS) participate in but react more selectively with electron-rich organic compounds. The effects Cl-, Br-, and carbonates...
While drinking water disinfection has effectively prevented waterborne diseases, an unintended consequence is the generation of byproducts (DBPs). Epidemiological studies have consistently observed association between consumption chlorinated with increased risk bladder cancer. Out >600 DBPs identified, regulations focus on a few classes, such as trihalomethanes (THMs), whose concentrations were hypothesized to correlate driving toxicity disinfected waters. However, responsible for cancer...
Chlorine disinfection of secondary wastewater effluent and drinking water can result in the production potent carcinogen N-nitrosodimethylamine (NDMA) at concentra tions approximately 100 10 parts per trillion (ng/L), respectively. Laboratory experiments with potential NDMA precursors indicate that formation form during chlorination dimethylamine other amines. The may involve slow 1,1-dimethylhydrazine by reaction monochloramine followed its rapid oxidation to products including...
Utilities incorporating the potable reuse of municipal wastewater are interested in converting from UV/H2O2 to UV/free chlorine advanced oxidation process (AOP). The AOP treatment reverse osmosis (RO) permeate often includes de facto UV/chloramine because chloramines applied upstream RO membranes. Models needed that accurately predict oxidant photolysis and subsequent radical reactions. By combining scavengers kinetic modeling, we have derived quantum yields for generation by UV HOCl, OCl–,...
The potent carcinogen, N-nitrosodimethylamine (NDMA), is produced during disinfection of municipal wastewater effluent from the reaction monochloramine and organic nitrogen-containing precursors. To delineate sources fate NDMA precursors treatment, formation was measured after extended chloramination both model samples conventional advanced treatment plants. Of precursors, only dimethylamine, tertiary amines with dimethylamine functional groups, dimethylamides formed significant...
The expansion of unconventional shale gas and hydraulic fracturing has increased the volume oil wastewater (OGW) generated in U.S. Here we demonstrate that OGW from Marcellus Fayetteville flowback fluids Appalachian conventional produced waters is characterized by high chloride, bromide, iodide (up to 56 mg/L), ammonium 420 mg/L). Br/Cl ratios were consistent for all brines, which reflect an origin a common parent brine, while I/Cl NH4/Cl varied among brines different geological formations,...
Significance Scavenging by halides to produce halogen radicals is recognized as a significant sink for hydroxyl radical ( • OH) in seawater. However, the contribution of transformation marine organic constituents has not been explored. Here, we demonstrate that are formed predominantly direct oxidation seawater (i.e., Cl − , Br ) excited-state triplet dissolved matter chromophores, an OH-independent pathway. The resulting increase photochemical rates important algal products, including...
The reported toxicity of oxybenzone-based sunscreens to corals has raised concerns about the impacts ecotourist-shed on already weakened by global stressors. However, oxybenzone’s mechanism(s) are not understood, hampering development safer sunscreens. We found that oxybenzone caused high mortality a sea anemone under simulated sunlight including ultraviolet (UV) radiation (290 370 nanometers). Although itself protected against UV-induced photo-oxidation, both and mushroom coral formed...
Nitrosamine formation during chloramination previously has been linked to a reaction between monochloramine and organic nitrogen precursors via unsymmetrical dialkylhydrazine intermediates. Our results demonstrate the critical importance of dichloramine dissolved oxygen. We propose new nitrosamine pathway in which reacts with secondary amine form chlorinated Oxidation these intermediates by oxygen nitrosamines competes their oxidation chloramines. Even when preformed was applied, our model...
The formation of the potent carcinogen, N-nitrosodimethylamine (NDMA), during chlorine disinfection has caused significant concern among drinking water and wastewater recycling utilities practicing intentional or unintentional chloramination. Previous research modeled NDMA as arising from a reaction between monochloramine organic nitrogen precursors, such dimethylamine, via an unsymmetrical dimethylhydrazine (UDMH) intermediate. Contrary to importance indicated by previous studies,...
The disposal and leaks of hydraulic fracturing wastewater (HFW) to the environment pose human health risks. Since HFW is typically characterized by elevated salinity, concerns have been raised whether high bromide iodide in may promote formation disinfection byproducts (DBPs) alter their speciation more toxic brominated iodinated analogues. This study evaluated minimum volume percentage two Marcellus Shale one Fayetteville HFWs diluted fresh water collected from Ohio Allegheny Rivers that...
Recent research has demonstrated that black carbons catalyze the transformation of a range nitrated explosives sorbed to carbon surfaces in presence sulfides. Although surface oxygenated functional groups, particularly quinones, and electrical conductivity have both been hypothesized promote these reactions, importance properties not tested. In this work, was addressed by producing chars increasing via pyrolysis wood shavings at temperature. The reactivity with respect explosive RDX sulfides...