R. Ryan Dupont

Utah State University

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Treatability Study of Car Wash Wastewater Using Upgraded Physical Technique with Sustainable Flocculant

Sustainability (2023)

Mai Fayed M. A. Shewitah R. Ryan Dupont M. Fatouh Mai M. Badr

Grease, oil, hydrocarbon residues, heavy metals, and surfactants are all present in car wash wastewater (CWW), which all can have detrimental effects on the environment and human health. This study was designed to assess CWW treatment using an upgraded physical technique combined with a range of conventional and more sustainable coagulants. Physical treatment effectively lowered the oil and grease (O&G) and chemical oxygen demand (COD) of the CWW by 79 ± 15% and 97 ± 1.6%, respectively. Additional treatment was provided using chemical coagulation–flocculation–settling. In jar test studies, humic acid (HA) and alum were found to provide significantly higher turbidity removal, 79.2 ± 3.1% and 69.8 ± 8.0%, respectively, than anionic polyacrylamide (APA), 7.9 ± 5.6% under influent turbidity values from 89 to 1000 NTU. Overall physical/chemical treatment of CWW yielded 97.3 ± 0.8% COD removal, and 99.2 ± 0.4% O&G removal using HA and alum. Due to the numerous problems created when using synthetic coagulants, naturally occurring coagulants that have no impact on human health, such as HA, are highly desirable options. The findings of this study show that treating CWW provides several advantages for sustainable development, health and well-being, and raising public knowledge and support for water reuse.

Turbidity

Alum

Grease

Polyacrylamide

Settling

10.3390/su15118581

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Citations (7)

Mineralogy and geochemistry affecting arsenic solubility in sediment profiles from the shallow basin-fill aquifer of Cache Valley Basin, Utah

Applied Geochemistry (2015)

Xianyu Meng R. Ryan Dupont Darwin L. Sorensen Astrid R. Jacobson Joan E. McLean

Carbonate minerals

10.1016/j.apgeochem.2015.12.011

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Citations (11)

Dehalococcoides abundance and alternate electron acceptor effects on large, flow-through trichloroethene dechlorinating columns

Applied Microbiology and Biotechnology (2015)

Babur S. Mirza Darwin L. Sorensen R. Ryan Dupont Joan E. McLean

Dehalococcoides

Electron acceptor

Electron flow

10.1007/s00253-015-7112-1

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Citations (9)

Arsenic Release and Attenuation Processes in a Groundwater Aquifer During Anaerobic Remediation of TCE with Biostimulation

Groundwater Monitoring & Remediation (2019)

Suzy Smith R. Ryan Dupont Joan E. McLean

Abstract Arsenic in groundwater in excess of the drinking water limit is usually from natural sources. The release of As, however, can be amplified by anthropogenic inputs of carbon, including those associated with the remediation of chlorinated solvents such as trichloroethylene (TCE). Large laboratory columns (15.2 cm diameter, 183 cm long) packed with aquifer solids from a TCE contaminated site near Hill Air Force Base (Utah) were fed with groundwater containing TCE and were biostimulated, bioaugmented, and monitored for TCE dechlorination over 7.5 years. This is a basin‐fill aquifer with As bearing geologic features. The objective of this study was to evaluate the biogeochemical changes that affect As solubilization that occurred after 7.5 years of feeding the columns with either whey or two formulations of Newman Zone® emulsified oil, and a no carbon addition control. The columns were analyzed in 10.16 cm sections for pore water and sediment quality parameters, parameters descriptive of redox conditions, and As geochemistry. The whey treatment resulted in 52.9% (±1.36%) (average ± standard deviation) of the total As in the solids leaching from the columns. The oil treatments promoted loss of 20.9% (±6.40%) of the total As. Arsenic solubility was associated with strongly reducing conditions developed with whey addition, leading to dissolution of crystalline Fe oxides and release of As. Arsenic was attenuated within the oil treated columns with As associated with carbonates in the lower layers. A consequence of adding whey, resulting in the desired full dechlorination of TCE in this aquifer, is the mobilization of As in groundwater.

Tetrachloroethylene

Biostimulation

Groundwater Remediation

10.1111/gwmr.12340

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Citations (9)

Field monitoring and performance evaluation of an in situ air sparging system at a gasoline-contaminated site

Journal of Hazardous Materials (2000)

Barbara L. Hall Thomas E. Lachmar R. Ryan Dupont

Air sparging

Sparging

Secondary air injection

10.1016/s0304-3894(99)00189-2

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Citations (14)

Arsenic solubilization and redistribution under anoxic conditions in three aquifer sediments from a basin-fill aquifer in Northern Utah: The role of natural organic carbon and carbonate minerals

Applied Geochemistry (2016)

Xianyu Meng R. Ryan Dupont Darwin L. Sorensen Astrid R. Jacobson Joan E. McLean

Carbonate minerals

10.1016/j.apgeochem.2016.01.004

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Citations (15)

Tracer studies for evaluation of in situ air sparging and in-well aeration system performance at a gasoline-contaminated site

Journal of Hazardous Materials (2003)

Jennifer S. Berkey Thomas E. Lachmar William J. Doucette R. Ryan Dupont

TRACER

Air sparging

Groundwater Remediation

10.1016/s0304-3894(02)00293-5

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Citations (6)

Effect of Biostimulation on Bacterial Communities of TCE Contaminated Aquifers

S. Muruganandam Joan E. McLean Darwin L. Sorensen R. Ryan Dupont Jeanette M. Norton

Biostimulation

Source

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Citations (0)

Volatilization of Trichloroethylene from Trees and Soil: Measurement and Scaling Approaches

Environmental Science & Technology (2013)

William J. Doucette H. A. Klein Julie K. Chard R. Ryan Dupont William A. Plaehn

Trichloroethylene (TCE) volatilization from leaves, trunk, and soil was measured to assess the significance of these pathways from phytoremediation sites at Travis and Fairchild Air Force Bases. Measurements were scaled temporally and spatially to estimate the annual volatilization of TCE at the Travis (0.82 ± 0.51 kg/yr) and Fairchild sites (0.014 ± 0.008 kg/yr). Volatilization was primarily through the leaf (0.34 ± 0.16 kg/yr at Travis and 0.01 ± 0.06 kg/yr at Fairchild) and soil (0.48 ± 0.36 kg/yr at Travis, 0.003 ± 0.002 kg/yr at Fairchild) pathways. The larger volatilization estimate at Travis was expected because of the site's higher TCE groundwater concentrations. Using groundwater data collected in 2004 and 2009, calculations show that over the 5 year period, 1.7 and 0.015 kg of TCE were removed each year at the Travis and Fairchild sites, respectively. On the basis of the scaled field measurements, volatilization from the leaves and soil may play a significant role in TCE removal at both sites. Daily and seasonal variations were not addressed during the limited daytime sampling events, but the methods described here provide a novel and practical framework for evaluating the potential importance of volatilization of TCE and similar compounds at phytoremediation sites.

Volatilisation

10.1021/es304115c

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Citations (27)

Evaluation of the Use of Solar Irradiation for the Decontamination of Soils Containing Wood Treating Wastes

Journal of the Air & Waste Management Association (1990)

R. Ryan Dupont Joan E. McLean Richard H. Hoff William M. Moore

Laboratory evaluation of the efficacy of soil phase photodegradation of recalcitrant hazardous organic components of wood treating wastes is described. The photodecomposition of anthracene, biphenyl, 9H-carbazole, m-cresol, dibenzofuran, fluorene, pentachlorophenol, phenanthrene, pyrene and quinoline under UV and visible light was monitored over a 50-day reaction period in three test soils. Methylene blue, riboflavin, hydrogen peroxide, peat moss and diethylamine soil amendments were evaluated as to their effect on the enhancement of compound photoreaction rates in the test soil systems. Dark control samples monitored over the entire study period were utilized to quantify non-photo mediated reaction losses. Compounds losses in both the dark control and irradiated samples were found to follow first order kinetics, allowing the calculation of first order photodegradation reaction rate constants for each test soil/compound combination. Degradation due to photochemical activity was observed for all test compounds, with compound photolytic half-lives ranging from 7 to approximately 180 days. None of the soil amendments were found to improve soil phase photodegradation, although photosensitization by anthracene was shown to significantly enhance the rate of photodegradation of the other test compounds. Soil type, and its characteristic of internal reflectance, proved to be the most significant factor affecting compound degradation rates suggesting the necessity for site specific assessments of soil phase photodegradation potential.

Photodegradation

Pentachlorophenol

10.1080/10473289.1990.10466780

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Citations (18)