(520) 621-2573

Research Area
•    Reuse of domestic and municipal wastewater for potable and non-potable applications
•    Development of novel analytical and bioanalytical methods for characterizing emerging contaminants in the environment
•    Evaluation of human and environmental health impacts from complex environmental contaminant mixtures
•    Development and implementation of sensor technologies/networds for water treatment and conveyance systems
•    Advanced oxidation and membrane technologies, including ceramic membranes, ozone/UV oxidation, and catalytic oxidation/reduction

Curriculum Vitae

Educational Qualifications
•    B.S., Chemistry, Thiel College – Greenville Pennsylvania, 1994
•    Ph.D., Environmental Toxicology, CMichigan State University – East Lansing, Michigan, 2000

The Snyder Research Group focuses on safe and sustainable water for urban, agricultural, and industrial needs.  Our team expertise is composed of three major disciplines: engineering, chemistry, and toxicology.  Our engineering research focuses on the development of water treatment technologies that minimize energy consumption and maximize water quality. In chemistry, we develop and apply methodologies to identify and quantify both known and unknown environmental contaminants using a wide-array of state of the art analytical instrumentation.  Our toxicology research primarily involves the use of in vitro bioassays to quantify cumulative toxicity of complex chemical mixtures.  By combining these three areas of research, we are able to comprehensively address challenging environmental issues such as potable water reuse, municipal biosolids for agricultural applications, and novel disinfection byproducts.

One of our recent studies seeks to determine the compounds responsible for observed mutagenicity in potable water following UV disinfection.  The use of polychromatic light from medium pressure (MP) UV systems has been widely employed for highly efficient disinfection and contaminant oxidation.  However, byproducts from MP UV light have been determined to be mutagenic and genotoxic.  Our team is investigating the factors influencing byproduct formation from UV light using both bench-scale and pilot-scale UV reactors.  We then conduct mutagenicity and genotoxicity tests in vitro and compare these to data from our high-resolution mass spectrometer instruments.  In this way, we are coming closer to identifying those byproducts which exert bioactivity while also determining the water quality and UV operational parameters that are most responsible for the formation of toxic byproducts.

Our research team also focuses on the development of sensor systems for on-line real time water quality monitoring and treatment process control. Currently, many water quality constituents (i.e., pesticides) are monitored by off-line methods where data reporting may take days if not weeks. In modern water treatment facilities, such as direct potable reuse, response times need to be faster if not instantaneous. For instance, we have developed fluorescence-based algorithms to monitor granulated activated carbon adsorption processes. Using our technique, we are able to monitor specific excitation/emission pairs and correlate the intensity to the degree of breakthrough of specific organic contaminants of concern. We also are working with partners in Optical Sciences to develop a compact and highly sensitive on-line monitor based on our discoveries.

Cross-cutting interdisciplinary research with the Colleges of Pharmacy, Medicine, and Public Health is another important, yet unique, characteristic of our research team.  Using our advanced mass spectrometers coupled with novel human cell assays, we are able to pioneer research in metabolomic responses of complex environmental exposures.  We are now better able to explore disease mechanistic pathways and progression by determining the impact to human cell metabolism from environmental contaminants.

•    American Water Works Association Best Paper of the Year Award (2011)

Selected Publications
2012    Mawhinney DB, Vanderford BJ, Snyder SA.  Transformation of 1H-Benzotriazole by Ozone in Aqueous Solution. Environmental Science & Technology.  46(13):7102-7111.

2012    Pisarenko AN, Stanford BD, Yan DX, Gerrity D, Snyder SA.  Effects of ozone and ozone/peroxide on trace organic contaminants and NDMA in drinking water and water reuse applications.

2011    Stanford BD, Pisarenko AN, Holbrook RD, Snyder SA.  Preozonation Effects on the Reduction of Reverse Osmosis Membrane Fouling in Water Reuse. Ozone: Science & Engineering. 33(5):379-388.ater Research. 46(2):316-326.

2011    Gerrity D, Gamage S, Holady JC, Mawhinney DB, Quinones O, Trenholm RA, Snyder SA.  Pilot-scale evaluation of ozone and biological activated carbon for trace organic contaminant mitigation and disinfection.  Water Research 45(5):2155-2165.

2011    Mawhinney DB, Young RB, Vanderford BJ, Borch T, Snyder SA.  The Artificial Sweetener Sucralose in U.S. Drinking Water Systems.  Environmental Science and Technology.  45:8716-8722

2010    Bruce GM, Pleus RC, Snyder SA.  Toxicological Relevance of Pharmaceuticals in Drinking Water.  Environmental Science & Technology.  41(14):5619-5626.

2010    Stanford BD, Trenholm RA, Holady JC, Vanderford BJ, Snyder SA.  Estrogenic Activity of US Drinking Waters:  A Relative Exposure Comparison.  Journal of the American Water Works Association.

2010    Snyder SA and Benotti MJ.  Endocrine Disruptors and Pharmaceuticals: Implications for Water Sustainability.  Water Science and Technology.  61.1:145-154.11):55-65.

2010    Rosario-Ortiz FL, Wert EC, Snyder SA.  Evaluation of UV/H2O2 Treatment for the Oxidation of Pharmaceuticals in Wastewater.  Water Research.  44:1440-1448.


University of Arizona College of Engineering