speitelGerald E. Speitel Jr., Ph.D., P.E.

John J. McKetta Professor in Engineering and
Associate Dean for Academic Affairs

The University of Texas at Austin
Cockrell School of Engineering
1 University Station C2100
Austin, TX 78712-0284
Phone 512-471-4996
Fax 512-475-6743
speitel@mail.utexas.edu
 

  • Link to BiOFiLM: a computer simulation model of electron donor and acceptor removal in packed-bed bioreactors containing deep biofilms.
  • Link to Steady: a steady-state wastewater treatment plant modeling program.

 

Recent Research Projects

Monochloramine Cometabolism: the Missing Link in Understanding Disinfectant Loss during Nitrification Episodes in Distribution Systems

Treatment of Perchlorate-Contaminated Water using a Combined Biotic/Abiotic Process

Removal of Trihalomethanes in Drinking Water by Cometabolism in Nitrifying Biofilters

Disinfection By-Product Formation and Control during Chloramination

Surface Complexation and Dynamic Transport Modeling of Arsenic Removal on Adsorptive Media

The Significance of Trihalomethanes in Preventing Distribution System Nitrification in Chloraminated Waters

Awards and Honors

Best Paper Award, Water Science and Technology Division, American Water Works Association (2002).

Best of Sessions Award, Texas Section, American Society of Civil Engineers, for paper presented at annual meeting (1999).

Thesis Advisor Award, Association of Environmental Engineering Professors, for advising recipient of first place award in the Montgomery Watson/AEEP Master's Thesis competition (1996).

Major Advisor Award, American Water Works Association, for advising recipient of first place award in the Master's Thesis competition (1994).

Faculty Excellence Award, College of Engineering, University of Texas (1990).

Rudolph Hering Medal, American Society of Civil Engineers (1988)


Refereed Publications

Wahman, D.W., Kirisits, M.J., Katz, L.E., and Speitel, G.E. Jr.  “Ammonia-Oxidizing Bacteria in Trihalomethane Removing Biofilters,” Applied and Environmental Microbiology (in press).

Alsulaili, A., Katz, L.E., and Speitel, G.E. Jr. “Monochloramine and Total Haloamine Decay After a Short Prechlorination Time in the Presence of Bromide,” Water Science and Technology: Water Supply, 10(4): 512-516.

Wahman, D.W., Katz, L.E., and Speitel, G.E. Jr. “Performance and Biofilm Activity of Nitrifying Biofilters Removing Trihalomethanes,“ Water Research, 45: 1669-1680, 2011.

Speitel, G.E., Jr., Kannappan, R., and Bayer, B.M. “Nitrification Index: a Unified Concept for Quantifying the Risk of Distribution System Nitrification,” Journal American Water Works Association, 103(1): 69-80, 2011.

Speitel, G.E., Jr., Katz, L., Chen, C.C., Stokes, S., Westerhoff, P., and Shafeiean, P., Surface Complexation and Dynamic Transport Modeling of Arsenic Removal on Adsorptive Media, American Water Works Association Research Foundation, Denver, CO, 2010.

Speitel, G.E., Jr., Bayer, B.M. and Kannappan, R., The Significance of Trihalomethanes in Preventing Distribution System Nitrification in Chloraminated Waters, American Water Works Association Research Foundation, Denver, CO, 2010.

Russell, C.G., Lawler, D.F., Speitel, G.E. Jr., and Katz, L.E. “Effect of Softening Precipitate Composition and Surface Characteristics on Natural Organic Matter Adsorption,” Environmental Science and Technology, 43(20): 7873-7842, 2009.

Russell, C.G., Lawler, D.F. and Speitel, G.E. Jr., “NOM Coprecipitation with Solids Formed during Softening,” Journal American Water Works Association, 101(4): 112-124, 2009.

Pope, P.G. and Speitel, G.E. Jr. “Reactivity of Bromine-Substituted Haloamines in Forming Haloacetic Acids,” in Disinfection By-Products in Drinking Water: Occurrence, Formation, Health Effects and Control, T. Karanfil, S.W. Krasner, P. Westerhoff, Y. Xie (eds.), ACS Symposium Series, 995, American Chemical Society, Washington, DC, 2008.

Pope, P.G., Martin Doole, M., Speitel, G.E., Jr., and Collins, M.R. “Relative Significance of Factors Influencing DXAA Formation during Chloramination,” Journal American Water Works Association, 99(9): 144-156, 2007.

Fairey, J.L., Katz, L.E., and Speitel, G.E. Jr. “Monochloramine Destruction with Granular Activated Carbon in Drinking Water Filters,” Journal American Water Works Association, 99(7): 110-120, 2007.

Lampert, D.J., Frisch, M.A., and Speitel, G.E. Jr. “Removal of Perfluorooctanoic Acid and Perfluorooctane Sulfonate from Wastewater by Ion Exchange,” Practice Periodical of Hazardous, Toxic, and Radioactive Waste Management, 11(1): 60-68, 2007.

Wahman, D.W., Katz, L.E., and Speitel, G.E. Jr. “Modeling of Trihalomethane Cometabolism in Nitrifying Biofilters,” Water Research, 41(2): 449-457, 2006.

Wahman, D.W., Katz, L.E., and Speitel, G.E. Jr. “Cometabolism of Trihalomethanes by a Mixed-Culture Nitrifying Biofilter,” Journal American Water Works Association, 98 (12): 48-60, 2006.

Pope, P.G., Speitel, G.E., Jr., and Collins, M.R. “DXAA Formation Kinetics during Chloramination,” Journal American Water Works Association, 98 (11): 107-120, 2006.

Wahman, D.W., Katz, L.E., and Speitel, G.E. Jr. “Cometabolism of Trihalomethanes by Mixed Culture Nitrifiers,” Water Research, 40 (18): 3349-3358, 2006.

Kalscheur, K.N., Gerwe, C.G., Kweon, J.H., Lawler, D.F., and Speitel, G.E., Jr., “Enhanced Softening: Effects of Source Water Quality on Natural Organic Matter Removal and Disinfection By-Product Formation,” Journal American Water Works Association, 98 (11): 93-106, 2006.

Fairey, J.L., Speitel, G.E. Jr., and Katz, L.E.  “Impact of Natural Organic Matter on Monochloramine Reduction by Granular Activated Carbon:  The Role of Porosity and Electrostatic Surface Properties,” Environmental Science and Technology,40 (13): 4268-4273, 2006.

Morley, M.C., Yamamoto, H., Speitel, G.E., Jr., and Clausen, J. “Fate and Transport of High Explosives in a Saturated Sandy Soil:  Particle Dissolution Kinetics,” Journal of Contaminant Hydrology, 85: 141– 158, 2006.

Morley, M.C., Speitel, G.E., Jr, and Fatemi, M. “Enhanced Desorption of RDX from Granular Activated Carbon,” Water Environment Research, 78 (3): 312-320, 2006.

Wahman, D.W., Katz, L.E., and Speitel, G.E. Jr. “Cometabolism of Trihalomethanes by Nitrosomonas europaea,” Applied and Environmental Microbiology, 71 (12): 7980-7986, 2005.

Pressman, J.G., Georgiou, G., and Speitel, G.E. Jr., “Scale-Up Considerations for a Hollow Fiber Membrane BioreactorTreating Trichloroethylene-Contaminated Water,” Water Environment Research, 77 (5): 533-542, 2005.

Speitel, G.E. Jr., Katz, L.E., Wahman, D.W., and Fairey, J.L. Cometabolism of Trihalomethanes in Nitrifying Biofilters, Report No. 91100F, American Water Works Association Research Foundation, Denver, CO, 2005.

Putz, A.H., Losh, D.E., and Speitel, G.E., Jr., “Removal of Nonbiodegradable Chemicals from Mixtures during GAC Bioregeneration,” Journal of Environmental Engineering, American Society of Civil Engineers, 131 (2): 196-205, 2005.

Morley, M.C., Henke, J.L., and Speitel, G.E., Jr.,  “Adsorption of RDX and HMX in Rapid Small-Scale Column Tests: Implications for Full Scale Adsorbers,” Journal of Environmental Engineering, American Society of Civil Engineers, 131 (1): 29-37, 2005.

Speitel, G.E. Jr., Pope, P.G., Collins, M.R., and Martin-Doole, M.  Disinfection By-Product Formation and Control During Chloramination, Report No. 91040F, American Water Works Association Research Foundation, Denver, CO, 2004.

Yamamoto, H., Morley, M.C., Speitel, G.E., Jr., and Clausen, J.,  “Fate and Transport of High Explosives in a Sandy Soil: Adsorption and Desorption,” Soil and Sediment Contamination, 13:361–379, 2004.

Nishijima, W. and Speitel, G.E., Jr., “Fate of Biodegradable Dissolved Organic Carbon Produced by Ozonation on Biological Activated Carbon,” Chemosphere, 56: 113–119, 2004.

Roalson, S.R., Kweon, J.H., Lawler, D.F., and Speitel, G.E., Jr., “Enhanced Softening: Effects of Lime Dose and Chemical Additions,” Journal American Water Works Association, 95 (11): 85-96, 2003.

Morley, M.C., Shammas, S.N., and Speitel, G.E., Jr., “Biodegradation of RDX and HMX Mixtures: Batch Screening Experiments and Sequencing Batch Reactors,” Environmental Engineering Science, 19 (4): 237-250, 2002.

Alvarez-Cohen, L. and Speitel, G.E. Jr., "Kinetics of Aerobic Cometabolism of Chlorinated Solvents," Biodegradation, 12 (2): 105-126, 2001.

Liu, C.Y., Speitel, G.E. Jr., and Georgiou, G.,  “Kinetics of MTBE Cometabolism at Low Concentrations by Pure Cultures of Butane Degrading Bacteria,” Applied and Environmental Microbiology, 67 (5): 2197-2201, 2001.

Shull, T.L., Speitel, G.E. Jr., and McKinney, D.C., “Biodegradation of RDX in Unsaturated Soil,” Bioremediation Journal, 5 (1): 1-11, 2001.

Speitel, G.E. Jr., Symons, J.M., Davis, J.M., and Wanielista, M.M., "AOP/Biofilm Processes for DOX Precursors,” Journal American Water Works Association, 92 (10): 59-73, 2000.

Diehl, A.C., Speitel, G.E. Jr., Symons, J.M., Krasner, S.W., Hwang, C.J., and Barrett, S.E., “Disinfection By-Product Formation During Chloramination” Journal American Water Works Association, 92 (6): 76-90, 2000.

Pressman, J.G., Georgiou, G., and Speitel, G.E. Jr., "A Hollow Fiber Membrane Bioreactor for the Removal of Trichloroethylene from the Vapor Phase," Biotechnology and Bioengineering, 68 (5): 548-556, 2000.

Aziz, C.E., Georgiou, G. and Speitel, G.E. Jr.  "Cometabolism of Chlorinated Solvents and Binary Chlorinated Solvent Mixtures Using M. trichosporium OB3b PP358," Biotechnology and Bioengineering, 65: 100-107, 1999.

Speitel, G.E. Jr., Symons, J.M., Davis, J.M., and Wanielista, M.M., Destruction of TOC and Disinfection By-Product Precursors through Advanced Oxidation and Biodegradation, American Water Works Association Research Foundation, Denver, CO, 1999.

Pressman, J.G., Georgiou, G., and Speitel, G.E. Jr., "Demonstration of Efficient Trichloroethylene Biodegradation in a Hollow Fiber Membrane Bioreactor," Biotechnology and Bioengineering, 62 (6): 681-692, 1999.

Symons, J.M., Xia, R., Speitel, G.E. Jr., Diehl, A.C., Hwang, C.J., Krasner, S.W., and Barrett, S.E.  Factors Affecting Disinfection By-Product Formation During Chloramination, Report No. 90728, American Water Works Association Research Foundation, Denver, CO, 1998.

Erlanson, B.C., Dvorak, B.I., Lawler, D.F., and Speitel, G.E. Jr., “Equilibrium Model for Biodegradation and Adsorption of Mixtures in GAC Columns,” Journal of Environmental Engineering, American Society of Civil Engineers, 123 (5): 469-478, 1997.

Cipparone, L.A., Diehl, A.C. and Speitel, G.E. Jr., "Ozonation and BDOC Removal: Effect on Water Quality,” Journal American Water Works Association, 89 (2): 84-97, 1997.

de Blanc, P.C., McKinney, D.C., Speitel, G.E. Jr., Sepehrnoori, K., and Delshad, M., “A Three-Dimensional, Multi-Component Model of Non-Aqueous Phase Liquid Flow and Biodegradation in Porous Media,” in Non-Aqueous Phase Liquids (NAPLs) in the Subsurface Environment: Assessment and Remediation, L.N. Reddi, ed., American Society of Civil Engineers, New York, 1996.

Fitch, M.W., Weissman, D., Phelps, P., Georgiou, G., and Speitel, G.E. Jr., “Trichloroethylene Degradation by Methylosinus trichosporium OB3b in a Sequencing Biofilm Reactor,” Water Research, 30 (11): 2655-2664, 1996.

Symons, J.M., Xia, R., Diehl, A.C., Speitel, G.E. Jr., Hwang, C.J., Krasner, S.W., and Barrett, S.E., “The Influence of Operational Variables on the Formation of Dissolved Organic Halogen During Chloramination,” in Water Disinfection and Natural Organic Matter: Characterization and Control, R.A. Minear and G.L. Amy (eds.), ACS Symposium Series 649, American Chemical Society: Washington, DC: 78-104, 1996.

Dvorak, B.I., Lawler, D.F., and Speitel, G.E. Jr., “The Niche for Steam Stripping in Treating Dilute SOC-Contaminated Waters,” Journal of Environmental Engineering, American Society of Civil Engineers, 122 (9): 871-874, 1996.

Dvorak, B.I., Herbeck, C.J., Meurer, C.P., Lawler, D.F., and Speitel, G.E. Jr., "Selecting Among Physical/Chemical Processes for Removing Synthetic Organics from Water," Journal of Environmental Engineering, American Society of Civil Engineers, 122 (7): 571-580, 1996.

Fitch, M.W., Speitel, G.E. Jr., and Georgiou, G., “Degradation of Trichloroethylene by Methanol-Grown Cultures of Methylosinus trichosporium OB3b PP358,” Applied and Environmental Microbiology, 26 (3): 1124-1128, 1996.

Symons, J.M., Krasner, S.W., Sclimenti, M.J., Simms, L.A., Sorensen, H.W. Jr., Speitel, G.E. Jr. and Diehl, A.C. " Influence of Bromide Ion on Trihalomethane and Haloacetic Acid Formation," in Disinfection By-Products in Water Treatment, The Chemistry of Their Formation and Control, R.A. Minear and G.L. Amy (eds.), Lewis Publishers/CRC Press, Inc., Boca Raton, FL: 91-130, 1996.

Aziz, C.E., Fitch, M.W., Linquist, L.K., Georgiou, G. and Speitel, G.E. Jr.  "Methanotrophic Biodegradation of Trichloroethylene in a Hollow Fiber Membrane Bioreactor," Environmental Science and Technology, 29 (10): 2574-2582, 1995.

Segar, R.L. Jr. and Speitel, G.E. Jr., “Cometabolism of Chloroethene Mixtures by Biofilms Grown on Phenol,” Bioremediation of Chlorinated Chemicals, R.E. Hinchee, A. Leeson, and L. Semprini (eds.), Battelle Press, Columbus, OH, p. 245-253, 1995.

Segar, R.L. Jr., DeWys, S.L. and Speitel, G.E. Jr., "Sustained Trichloroethylene Cometabolism by Phenol-Degrading Bacteria in Sequencing Biofilm Reactors," Water Environment Research, 67 (5): 764-774, 1995.

Speitel, G.E. Jr. and Segar, R.L. Jr.,  "Cometabolism in Biofilm Reactors," Water Science and Technology, 31 (1): 215-225, 1995.

Symons, J.M., Speitel, G.E. Jr., Diehl, A.C. and Sorensen, H.W., "Precursor Control in Water Containing Bromide,” Journal American Water Works Association, 86 (6): 48-60, 1994.

Speitel, G.E. Jr., Segar, R.L. Jr. and DeWys, S.L., "Trichloroethylene Cometabolism by Phenol-Degrading Bacteria in Sequencing Biofilm Reactors," in Bioremediation of Chlorinated and Polycyclic Aromatic Hydrocarbon Compounds, R.E. Hinchee, A. Leeson, L. Semprini, and S.K. Ong (eds.), Lewis Publishers, Boca Raton, FL, p. 333-338, 1994.

Fitch, M.W., Graham, D.W., Arnold, R.G., Agarwal, S.K., Phelps, P., Speitel, G.E. Jr. and Georgiou, G., "Phenotypic Characterization of Copper-Resistant Mutants of Methylosinus trichosporium OB3b," Applied and Environmental Microbiology, 59: 2771-2776, 1993.

Dvorak, B.I., Lawler, D.F., Speitel, G.E. Jr., Jones, D.L., and Boadway, D.A., "Selection Among Treatment Technologies for Waters Contaminated with Synthetic Organic Chemicals,"  Water Environment Research, 65 (7): 827-838, 1993.

Speitel, G.E. Jr. and McLay, D.S., "Biofilm Reactors for the Treatment of Gas Streams Containing Chlorinated Solvents," Journal of Environmental Engineering, American Society of Civil Engineers, 119 (4): 658-678, 1993.

Speitel, G.E. Jr., Symons, J.M., Diehl, A.C., Sorensen, H.W., and Cipparone, L.A., "Effect of Ozone Dose and Subsequent Biodegradation on Removal of Disinfection By-Product Precursors," Journal American Water Works Association, 85 (5): 86-95, 1993.

Speitel, G.E. Jr., Thompson, R.C. and Weissman, D.,  "Biodegradation Kinetics of Methylosinus trichosporium OB3b at Low Concentrations of Chloroform in the Presence and Absence of Enzyme Competition by Methane," Water Research, 27 (1): 15-24, 1993.

Phelps, P., Agarwal, S., Speitel, G.E. Jr. and Georgiou, G., "Methylosinus trichosporium OB3b Mutants Having Constitutive Expression of Soluble Methane Monooxygenase in the Presence and Absence of High Levels of Copper," Applied and Environmental Microbiology, 58 (11): 3701-3708, 1992.

Speitel, G.E. Jr. and Leonard, J.M., "A Sequencing Biofilm Reactor for the Treatment of Chlorinated Solvents Using Methanotrophs," Water Environment Research, 64 (5): 712-719, 1992.

Speitel, G.E. Jr. and Alley, E.R. Jr., "Bioremediation of Unsaturated Soils Contaminated with Chlorinated Solvents," Journal of Hazardous Materials, 28: 81-90, 1991.

Speitel, G.E. Jr. and Closmann, F.B., "Chlorinated Solvent Biodegradation by Methanotrophs in Unsaturated Soils," Journal of Environmental Engineering, American Society of Civil Engineers, 117, (5): 541-558, 1991.

Lu, C.J. and Speitel, G.E. Jr., "Effect of Natural Organic Matter on Biodegradation of a Recalcitrant Synthetic Organic Chemical," Journal American Water Works Association, 83 (2): 56-61, 1991.

Speitel, G. E. Jr. and Zhu, X. J., "Sensitivity Analyses of Biodegradation/Adsorption Models," Journal of Environmental Engineering, American Society of Civil Engineers, 116 (1): 32-48, 1990.

Speitel, G. E. Jr., Turakhia, M. H. and Lu, C. J., "Initiation of Micropollutant Biodegradation in Virgin GAC Columns," Journal American Water Works Association, 81 (4): 168-176, 1989.

Speitel, G. E. Jr., Lu, C. J., Turakhia, M. H. and Zhu, X. J., "Biodegradation and Adsorption of a Bisolute Mixture in GAC Columns," Journal Water Pollution Control Federation, 61 (2): 221-229, 1989.

Speitel, G. E. Jr., Lu, C. J. and Turakhia, M. H., "Biodegradation of Trace Concentrations of Substituted Phenols in GAC Columns," Environmental Science and Technology, 23 (1):68-74, 1989.

Speitel, G. E. Jr., Lu, C. J. and Turakhia, M. H., "Biodegradation of Synthetic Organic Chemicals in GAC Beds," Water Science and Technology, 20 (11/12): 463-465, 1988.

Speitel, G. E. Jr. and DiGiano, F. A., "Determination of Microbial Kinetic Coefficients through Measurement of Initial Rates by Radiochemical Techniques," Water Research, 22 (7): 829-835, 1988.

Speitel, G. E. Jr. and DiGiano, F. A., "Biofilm Shearing under Dynamic Condi­tions," Journal of Environmental Engineering, American Society of Civil Engineers, 113 (3):  464-475, 1987.

Speitel, G. E., Jr., Dovantzis, K. and DiGiano, F. A., "Mathematical Modeling of Bioregeneration in GAC Columns," Journal of Environmental Engineering, American Society of Civil Engineers, 113 (1):  32-48, 1987.

Speitel, G. E. Jr. and DiGiano, F. A., "The Bioregeneration of GAC Used to Treat Micropollutants," Journal American Water Works Association, 79 (1):  64-73, 1987.

Speitel, G. E. Jr. and Hughes, M. M., "Considerations in Modeling Activated Sludge Process," Journal of the Environmental Engineering Division, American Society of Civil Engineers, 108 (5):  990-1002, 1982.


Conference Proceedings

Carter, E.M., Katz, L.E., and Speitel, G.E. Jr.,  “Gas-phase formaldehyde adsorption studies on multiple types of activated carbon” Proceedings of Healthy Buildings 9th International Conference & Exhibition, September 13-17, Syracuse, NY, 2009.

Katz, L., Chen, C.C., Speitel, G.E., Jr., and Stokes, S. “Modeling of Metal Ion Adsorption in Packed Bed Reactor Systems, Abstracts of Papers, 237nd American Chemical Society National Meeting, Salt Lake City, UT, 2009.

Kannappan, R. and Speitel, G.E., Jr. “Combined Effect of Trihalomethanes and Monochloramine on Distribution System Nitrification,” Annual Conference Proceedings, American Water Works Association, 2008.

Bayer, B.M. and Speitel, G.E. Jr. “Significance of Trihalomethanes in Preventing Distribution System Nitrification,” Annual Conference Proceedings, American Water Works Association, 2007.

Katz, L., Stokes, S., Speitel, G.E., Jr., and Chen, C.C.  “Experimental and Modeling Approaches for Investigation of Systems Involving Metal-Anion Pairing at Solid/Water Interfaces,” Abstracts of Papers, 232nd American Chemical Society National Meeting, San Francisco, CA, 2006.

Stokes, S., Chen, C.C., Speitel, G.E., Jr., and Katz, L.  “Diffuse Layer Modeling (DLM) of Arsenic Adsorption to Three Commercially Available Granular Media,” Abstracts of Papers, 231st American Chemical Society National Meeting, Atlanta, GA, 2006.

Pope, P.G., Speitel, G.E., Jr.  “Relative Reactivity of Haloamine Species in DXAA Formation,” Annual Conference Proceedings, American Water Works Association, 2006.

Fairey, J.L., Katz, L.E., and Speitel, G.E. Jr. “Understanding physicochemical properties of GAC for monochloramine destruction,” Annual Conference Proceedings, American Water Works Association, 2006.

Wahman, D.G., Speitel, G.E., Jr., and Katz, L.E.  “Trihalomethane Cometabolism by Nitrifying Bacteria: Biofilter Performance,” Proceedings of the Water Quality Technology Conference, American Water Works Association, 2004.

Fairey, J.L., Katz, L.E., and Speitel, G.E., Jr.  “Monochloramine Destruction in GAC Beds,” Proceedings of the Water Quality Technology Conference, American Water Works Association, 2004.

Pressman, J.G., Georgiou, G., Speitel, G.E. Jr., "Hollow Fiber Membrane Bioreactor for Cometabolic Degradation of Chlorinated Solvents - Experimental Results and Model Development," Proceedings, Specialized Conference on Water Environment-Membrane Technology, International Water Association, Seoul, Korea, 2004.

Sanchez, A.F.J., Katz, L.E., and Speitel, G.E., Jr. “Perchlorate Remediation Using Combined Biotic/Zero Valent Iron Treatment,” Proceedings, Fourth International Conference on Remediation of Chlorinated and Recalicitrant Compounds, Monterey, CA, 2004.

Wahman, D.G., Henry, A.E., and Speitel, G.E., Jr.  “Trihalomethane Cometabolism by Nitrifying Bacteria: Kinetics and Biofilter Performance,” Proceedings of the Water Quality Technology Conference, American Water Works Association, 2003.

Gerwe, C.E., Lawler, D.F., Speitel, G.E. Jr., Katz, L.E., and Bennett, P.C.  “Natural Organic Matter (NOM) Adsorption onto and Coprecipitation with Solids Formed during Softening,”  Annual Conference Proceedings, American Water Works Association, 2003.

Pope, P.G., Speitel, G.E., Jr., Martin-Doole, M., and Collins, M.R.,  “DXAA Formation Kinetics during Chloramination,”  Annual Conference Proceedings, American Water Works Association, 2003.

Wahman, D.G. and Speitel, G.E., Jr.  “Cometabolism of Trihalomethanes by Nitrifying Bacteria under Drinking Water Conditions,” Proceedings of Texas Water 2003.

Pope, P.G., Speitel, G.E., Jr., Martin-Doole, M., and Collins, M.R.,  “Factors Contributing to DXAA Formation during Chloramination,” Proceedings of the Water Quality Technology Conference, American Water Works Association, 2002.

Putz, A.R.H. and Speitel, G.E., Jr., “The Role of Cometabolism in the Bioregeneration of Granular Activated Carbon Columns,” Proceedings of Water Environment Federation Annual Conference and Exposition, 2002.

Pressman, J.G., Georgiou, G., and Speitel, G.E. Jr., “Development of a Hollow Fiber Membrane Bioreactor for Cometabolic Degradation of Chlorinated Solvents,” Proceedings of Water Environment Federation Annual Conference and Exposition, 2002.

Martin-Doole, M., Collins, M.R., Speitel, G.E., Jr., and Pope, P.G., “Evaluating Chloramination Factors and NOM Characteristics in the Formation of DXAA,” Annual Conference Proceedings, American Water Works Association, 2002.

Smith, K.N., Gerwe, C., Kweon, J.H., Speitel, G.E., Jr, and Lawler, D.F., “Guidelines for Enhanced Softening: Raw Water Characteristics, NOM Removal, and DBP Formation,” Annual Conference Proceedings, American Water Works Association, 2002.

Morley, M.C. and Speitel, G.E., Jr., “Methods for Enhancing the Desorption of High Explosives from Activated Carbon,” Proceedings of Water Environment Federation Annual Conference and Exposition, 2001.

Putz, A.H., Losh, D.E., and Speitel, G.E., Jr., “Biological Activated Carbon: Understanding the Role of Metabolism in Extending Service Life and Improving Process Performance,” Annual Conference Proceedings, Water Research, American Water Works Association, 2001.

Kweon, J.H., Gerwe, C.E., Lawler, D.F., and Speitel, G.E., Jr., “Enhanced Softening: Effects of Raw Water Characteristics and Chemical Additions,” Annual Conference Proceedings, Water Research, American Water Works Association, 2000.

Liu, C.Y., Speitel, G.E. Jr., and Georgiou, G., “Biodegradation of MTBE by Butane-Oxidizing Arthrobacter, “Poster Abstracts, Second International Conference on Remediation of Chlorinated and Recalicitrant Compounds, Monterey, CA, 2000.

Ralls, S.M., Kweon, J.H., Speitel, G.E., Jr., and Lawler, D.F., “Enhanced Softening for Disinfection By-Product Precusor Removal,” Annual Conference Proceedings, Water Research, American Water Works Association, 1999.

Morley, M.C., Shammas, S., and Speitel, G.E., Jr., "Adsorption and Biodegradation of High Explosives on Granular Activated Carbon," Environmental Engineering 1999: Proceedings of the ASCE-CSCE National Conference on Environmental Engineering, American Society of Civil Engineers, Reston, VA: 254-262, 1999.

de Blanc, P.C., D.C. McKinney and G.E. Speitel, “UTCHEM: A Multiphase Flow and Biodegradation Model,” Society of Petroleum Engineers paper number 52734, Presented at the SPE/EPA Exploration and Production Environmental Conference, Austin, Texas, March 1-3, 1999.

Speitel, G.E.  Jr., "Control of Disinfection By-Product Formation Using Chloramines," In: Formation and Control of Disinfection By-Products in Drinking Water, P.C. Singer (ed.), American Water Works Association, Denver, CO, 1999.

Morley, M.C., Shammas, S., and Speitel, G.E., Jr., "Bioregeneration of Granular Activated Carbon Contaminated High Explosives Compounds," In: Bioremediation of Nitroaromatic and Haloaromatic Compounds, B.C. Alleman and A. Leeson (eds.), Battelle Press, Columbus, OH, 1999.

Pressman, J.G., Georgiou, G., and Speitel, G.E. Jr., "Demonstration of Efficient Trichloroethylene Biodegradation in a Hollow Fiber Membrane Bioreactor," Proceedings of Water Environment Federation 71st Annual Conference, Vol. 1, Orlando, FL: 153-164, 1998.

Speitel, G.E. Jr., Symons, J.M., Davis, J.M., and Wanielista, M.M., "Destruction of TOC and Disinfection By-Product Precursors through Advanced Oxidation and Biodegradation," ,” Annual Conference Proceedings, Water Research, Vol. C, American Water Works Association, Dallas, TX: 405-422, 1998.

Morley, M.C., Henke, J.L., Shammas, S., and Speitel, G.E. Jr., "Adsorption and Biodegradation of High Explosives on Granular Activated Carbon," 1998 Researchers' Conference Proceedings, Amarillo National Resource Center for Plutonium, Amarillo, TX: 81-82, 1998.

Gerwe, C.E., Shull, T.L., McKinney, D.C., and Speitel, G.E. Jr., "Fate and Transport of High Explosives within the Vadose Zone at Pantex," 1998 Researchers' Conference Proceedings, Amarillo National Resource Center for Plutonium, Amarillo, TX: 89-90, 1998.

Shull, T.L., Speitel, G.E. Jr., and McKinney, D.C. "Remediation of High Explosives in Pantex Soil," Proceedings, Texas Section American Society of Civil Engineers, Spring Meeting, South Padre Island, TX, 72-81, 1998.

Pope, G., Sepehrnoori, K., Sharma, M.M., McKinney, D.C., Speitel, G.E. Jr., and Jackson, R.E., "Three Dimensional NAPL Fate and Transport Model," Environmental Research Brief, USEPA, Robert S. Kerr Environmental Research Laboratory, 1998.

Pressman, J.G., Fitch, M.W., Georgiou, G., and Speitel, G.E. Jr., "Degradation of Trichloroethylene by Methylosinus trichosporium OB3b PP358 in a Hollow Fiber Membrane Bioreactor," Proceedings 5th Annual BPREC Meeting,  KAIST, S. Korea, 1997.

Symons, J.M., Speitel, G.E. Jr., Hwang, C.J., Krasner, S.W., Barrett, S.E., Diehl, A.C., and Xia, R., “Factors Affecting Disinfection By-Product Formation During Chloramination,” DBP Chemistry: A Seminar Designed for Water Quality Engineers and Chemists, Proceedings, Water Quality Technology, Boston, MA, 1997.

Aziz, C.E., Georgiou, G., and Speitel, G.E. Jr.  "Cometabolic Degradation of Chlorinated Solvent Mixtures by M. trichosporium OB3b PP358," in In Situ and On-Site Bioremediation: Volume 3 Battelle Press, Columbus, OH: 79-84, 1997.

de Blanc, P.C., C.L. Brown, McKinney, D.C., Speitel, G.E. Jr., and Pope, G.A., “Surfactant Flushing and Bioremediation - Striking a Balance,” In Situ and On-Site Bioremediation: Volume 2 Battelle Press, Columbus, OH: 565-574, 1997.

de Blanc, P.C., McKinney, D.C., and Speitel, G.E. Jr., “Modeling Subsurface Biodegradation of Non-Aqueous Phase Liquids,” in Advances in Porous Media, Volume 3, M.Y. Coaragcioglu (ed.), Elsevier Science, Amsterdam, The Netherlands: 1-82, 1996.

Pressman, J.G., Aziz, C.E., Georgiou, G., and Speitel, G.E. Jr.  "Treatment of Chlorinated Solvents in Hollow Fiber Membrane Bioreactors," Proceedings of 2nd Annual Symposium on Energy and the Environment, Rice University, Houston, TX: 99-104, 1996.

Aziz, C.E., Fitch, M.W., Pressman, J.G., Georgiou, G., and Speitel, G.E. Jr.  "Hollow Fiber Membrane Bioreactor Treatment of Chlorinated Solvent-Contaminated Groundwater," Proceedings of Water Environment Federation Conference, Vol. 1, Wastewater Treatment Research Symposia, Dallas, TX: 369-377, 1996.

deBlanc, P.C., Sepehrnoori, K., Speitel, G.E. Jr, and McKinney, D.C. “Investigation of Numerical Solution Techniques for Biodegradation Equations in a Groundwater Flow Model,”  Computational Methods in Water Resources XI, Volume 1: Computational Methods in Subsurface Flow and Transport Problems, A.A. Aldama, J. Aparicio, C.A. Brebbia, W.G. Gray, I. Herrera, and G.F.Pinder (eds.), Computational Mechanics Publications, Southhampton, 1996.

Krasner, S.W., Symons, J.M., Speitel, G.E. Jr., Diehl, A.C., Hwang, C.J., Xia, R., and Barrett, S.E., “Effects of Water Quality Parameters on DBP Formation During Chloramination,” Annual Conference Proceedings - Water Quality (D), American Water Works Association, Toronto, Canada: 601-628, 1996.

Symons, J.M., C.J., Xia, Speitel, G.E. Jr., Diehl, A.C., Hwang, C.J., Barrett, S.E., and Krasner, S.W., “Disinfection By-Product Formation During Pilot-Scale Chloramination of Three Different Surface Waters,” Annual Conference Proceedings - Water Quality (D), American Water Works Association, Toronto, Canada: 651-680, 1996.

Oppelt, M.K., Speitel, G.E. Jr., and Loehr, R.C., “Sorptive Properties of Refinery Sludge Under Deep Well Injection Conditions,” American Institute of Chemical Engineers Spring National Meeting, Paper No. 61B, New Orleans, LA, 1996.

Dvorak, B.I., Erlanson, B.E., Speitel, G.E. Jr., and Lawler, D.F., “An Equilibrium Model for Combined Biodegradation and Adsorption in GAC Columns: Model Development, Process Performance, and Economic Comparisons,” Proceedings of Water Environment Federation Conference, Miami Beach, FL, Vol. 1, Part I: 179-190, 1995.

Diehl, A.C., Speitel, G.E. Jr., Symons, J.M., Krasner, S.W., and Hwang, C.J., “Factors Affecting Disinfection By-Product Formation During Chloramination,” Proceedings of  American Water Works Association Annual Conference, Water Quality, Anaheim, CA: 535-546, 1995.

Sclimenti, M.J., Hwang, C.J., Speitel, G.E. Jr., and Diehl, A.C., “The Simultaneous Determination of Cyanogen Chloride and Cyanogen Bromide in Chloraminated Waters by a Simplified Microextraction, GC/ECD Technique,” Proceedings of American Water Works Association Water Quality Technology Conference, San Francisco, CA: 489-507, 1994.

Speitel, G.E. Jr. and Diehl, A.C., "Biodegradation of Natural Organic Matter and Disinfection By-Product Precursors," Proceedings of  American Water Works Association Annual Conference, Water Research, New York, NY: 75-95, 1994.

Dvorak, B.I., Lawler, D.F. and Speitel, G.E. Jr., "Process Selection for Treatment of SOC Contaminated Waters," Proceedings of Environmental Engineering Specialty Conference, American Society of Civil Engineers, Boulder, CO: 601-608, 1994.

Dvorak, B.I., Lawler, D.F. and Speitel, G.E. Jr., "Treatment Process Selection for Waters Contaminated by Synthetic Organic Chemicals," Preprints of Papers Presented at the 207th American Chemical Society National Meeting, Division of Environmental Chemistry, San Deigo, CA, 34(1): 183-186, 1994.

Speitel, G.E. Jr., Georgiou, G., Linquist, L.K. and Fitch, M.W., "Biodegradation of TCE by Methylosinus trichosporium OB3b in Hollow Fiber Membrane Reactors," Abstracts of American Chemical Society Symposium, Emerging Technologies in Hazardous Waste Management V, Atlanta, GA: 526-529, 1993.

Cipparone, L.A., Diehl, A.C. and Speitel, G.E. Jr., "The Effect of Biodegradable Organic Carbon Removal on the Bacterial Regrowth Potential and Disinfection By-Product Formation of Ozonated Water," Proceedings of  American Water Works Association Annual Conference, Water Research, San Antonio, TX: 529-539, 1993.

Segar, R.L. Jr. and Speitel, G.E. Jr., "Sequencing Biofilm Reactors for the Treatment of Groundwater Contaminated with Chlorinated Solvents," Proceedings of  American Water Works Association Annual Conference, Water Research, San Antonio, TX: 651-666, 1993.

Symons, J.M., Speitel, G.E. Jr., Diehl, A.C. and Sorensen, H.W., "Behavior of Bromine-Substituted THMs and HAAs during Ozonation and Biodegradation," Proceedings of  American Water Works Association Annual Conference, Water Quality, San Antonio, TX: 775-808, 1993.

DiGiano, F.A. and Speitel, G.E. Jr., "Biofilm Computer Models: Time for Practical Applications?" Journal American Water Works Association, 85 (5): 26, 1993.

Segar, R.L. Jr., Speitel, G.E. Jr., and DeWys, S.L., "Feeding Strategies That Sustain TCE Cometabolism in Sequencing Biofilm Reactors," Proceedings of Water Environment Federation Conference, Vol. 1-, New Orleans, LA: 285-296, 1992.

Speitel, G.E. Jr., Symons, J.M., Cipparone, L.A., Diehl, A.C. and Sorensen, H.W., "Removal of Disinfection By-Product Precursors and Biodegradable Organic Carbon through Ozonation and Biodegradation," Proceedings of  American Water Works Association Annual Conference, Water Research, Vancouver, B.C.: 543-551, 1992.

Segar, R.L. Jr., DeWys, S.L. and Speitel, G.E. Jr., "Sequential Biofilm Reactors for the Treatment of Chlorinated Solvents," Proceedings of HMC-South '92 Conference, New Orleans, LA: 136-139, 1992.

Dvorak, B.I., Lawler, D.F., Jones, D.L., Boadway, D.A. and Speitel, G.E. Jr., "Sytematic Approach for the Selection of the Least Cost Treatment Technology for Aqueous Organic Hazardous and Industrial Wastes," Proceedings of 46th Annual Purdue Industrial Waste Conference, West Layfayette, IN, 1991.

Speitel, G.E. Jr. and Alley, E.R. Jr., "Bioremediation of Unsaturated Soil Contaminated with Chlorinated Solvents," Proceedings of 3rd Annual Symposium of the Gulf Coast Hazardous Substance Research Center, Beaumont, TX, 1991.

Speitel, G.E., Jr., Segar, R.L., Jr. and Leonard, J.M., "Bioreactor Technology for the Treatment of Trace Levels of Chlorinated Solvents," Proceedings of Petroleum Hydrocarbons and Organic Chemicals in Ground Water, National Water Well Association, Houston, TX, 1990.

Segar, R.L., Jr. and Speitel, G.E., Jr., "Bioreactors for the Cometabolism of Chlorinated Solvents by Microorganisms Growing on Aromatic Chemicals," Abstracts of Water Pollution Control Federation Annual Conference, Washington, DC, 1990.

Speitel, G.E. Jr. and McLay, D.S., "Biofilm Reactors for Treatment of Gas Streams Containing Chlorinated Solvents," Proceedings of Environmental Engineering Specialty Conference, American Society of Civil Engineers, Washington, DC, 1990.

Speitel, G.E. Jr., Thompson, R.C., Segar, R.L. Jr. and Leonard, J.M., "Effect of Growth Substrate and Microbial Population on the Biotransformation of Chlorinated Aliphatic Chemicals," proceedings of American Water Works Association Annual Conference, Cincinnati, OH, 1990.

Closmann, F.B. and Speitel, G.E. Jr., "Aerobic Biodegradation of Chlorinated Solvents in Unsaturated Soils," Proceedings of Haztech International 90, Houston, TX: 76-82, 1990.

Speitel, G.E. Jr., Patterson, A.M., Lu, C.J. and Thompson, R.C., "Aerobic Biodegradation of Chloroform and Trichloroethylene in Drinking Water Treatment," Proceedings of American Water Works Association Annual Conference, Los Angeles, CA : 1443-1450, 1989.

Closmann, F.B. and Speitel, G.E. Jr., "Aerobic Biodegradation of Chlorinated Solvents in Unsaturated Soils," Proceedings of Environmental Engineering Specialty Conference, American Society of Civil Engineers, Austin, TX: 734-741, 1989.

Lu, C.J. and Speitel, G.E. Jr., "The Effect of Structurally Similar Chemicals on the Biodegradation of Recalcitrant Compounds," Abstracts of Water Pollution Control Federation Annual Conference, Dallas, TX, 1988.

Speitel, G. E. Jr., "Mass Transport and Microbial Kinetics Considerations for Biodegradation in GAC Columns," Extended Abstracts of Summer National Meeting of American Institute of Chemical Engineers, Denver, CO, 1988.

Lu, C.J. and Speitel, G.E. Jr., "Enhanced Biodegradation of Recalcitrant Compounds by Analogous Enrichment," Proceedings of American Water Works Association Annual Conference, Orlando, FL: 1813-1825, 1988.

Speitel, G. E. Jr., Lu, C. J. and Turakhia, M. H., "Biodegradation of Synthetic Organic Chemicals in GAC Beds," Proceedings of International Conference for Water and Wastewater Microbiology, Newport Beach, CA, Volume 2, Paper 88, 1988.

Speitel, G. E. Jr., Lu, C. J., Turakhia, M. H. and Zhu, X. J., "Biodegradation and Adsorption of Multi-Component Mixtures in GAC Beds," Abstracts of Water Pollution Control Federation Annual Conference, Philadelphia, PA, 1987.

Speitel, G. E. Jr., and Zhu, X. J., "Mathematical Modeling of Adsorption and Biodegradation in GAC Beds," Proceedings of ASCE Environmental Engineering Specialty Conference, Orlando, FL:  559-566, 1987.

Speitel, G. E. Jr., Turakhia, M. H. and Lu, C. J., "Biodegradation and Adsorption of Synthetic Organic Chemicals in GAC Columns," Proceedings of American Water Works Association Annual Conference, Kansas City, MO: 1089-1097, 1987.

Speitel, G. E. Jr. and DiGiano, F. A., "Bioregeneration at Micropollutant Concen­trations in GAC Columns," Proceedings of American Water Works Association Annual Conference, Washington, DC:  981-1005, 1985.

DiGiano, F. A. and Speitel, G. E. Jr., Discussion of:  "Organic Removal Mechanisms in Biophysical Treatment Systems," Schultz, J. R. and Keinath, T. M., Proceedings of 12th Biennial International Conference of International Association on Water Pollution Research and Control, Amsterdam, 1984.

DiGiano, F. A., Dovantzis, K. and Speitel, G. E. Jr., "Influence of Adsorption on Biofilm Development," Proceedings of Environmental Engineering Specialty Conference, American Society of Civil Engineers, Los Angeles, CA:  382-393, 1984.

Speitel, G. E. Jr. and DiGiano, F. A., "Interpretation of Microbial Kinetics in Adsorptive Systems at Low Substrate Concentrations," Proceedings of American Water Works Association Annual Conference, Las Vegas, NV:  487-502, 1983.

Speitel, G. E. Jr., Discussion of:  "Powdered Versus Granular Activated Carbon for Oil Refinery Treatment," C. G. Grieves et al., Journal Water Pollution Control Federation, 54 (3):  318-319, 1982.

Lamb, J. C., III, Singer, P. C., Rader, R., Reckhow, D. and Speitel, G., "Characterization and Biological Treatability of Coal Conversion Wastewaters," Pro­ceedings 34th Purdue Industrial Waste Conference, West Layfayette, IN, Ann Arbor Science, 1979.

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