Professor Ronald Hofmann

Associate Professor,  NSERC Associate Industrial Research Chair

Environmental Engineering Icon Environmental Engineering Research Section

Professor Ronald Hofmann

Contact me

Ron Hofmann
Dept. of Civil Engineering
University of Toronto
35 St. George St.
Toronto, Ontario
Canada, M5S 1A4

Room GB319C

Tel: 416-946-7508
ron.hofmann@utoronto.ca

Research Interests

Drinking water treatment optimization.

Education

Ph.D. (University of Toronto), P.Eng.
M.A.Sc (University of Toronto)
B.Eng. (Condordia University)

Teaching

Course Code Title & Description Instructor Session Location(s) Day(s) Start Time End
CIV1308H Prof. Ron Hofmann Winter 2017 GB 405 (Mondays), LM6 (Thursdays) Mondays 1-3pm and Thursdays 1-4pm
CME270H1 Prof. Ron Hofmann Fall 2016 Scheduled by the Office of the Faculty Registrar.

Research

My research focuses on drinking water treatment technologies, with an emphasis on disinfection and oxidation technologies and microbiological systems.  I routinely work with municipalities, consultants, manufacturers, government, and academia on a wide range of projects.

A more complete description of my work is given on the Drinking Water Research Group website.

Publications

Published Refereed Journal Articles

 

  1. Lakghomi, B., Lawryshyn, Y., Hofmann, R. (2015) A model of particle removal in a dissolved air flotation tank: importance of stratified flow and bubble size. Water Research. 68:1:262-272.
  2. Wang, D., Bolton, J.R., Andrews, S.A.A., Hofmann, R. (2015) Formation of disinfection by-products in the ultraviolet/chlorine advanced oxidation process. Science of the Total Environment, 518-519:49-57.
  3. Zhang, J. and Hofmann, R. (2013) Modeling the Adsorption of Emerging Contaminants on Activated Carbon: Classical and Quantum QSAR Approaches. Water Science and Technology: Water Supply, 13:6:1543-155.
  4. Wu, S.K., Smith, K., Hofmann, R., and R.E. Cantwell. (2013) Factors influencing nitrification in point of use BioSand Filters. Journal of Water Supply: Research and Technology-Aqua, 62:6:359-366.
  5. Smith, K., Zhang, X. and Hofmann, R. (2012) Assessment of alternative characterization tests for prediction of taste and odour control by granular activated carbon. Water Science and Technology: Water Supply, 12:4:531‐539.
  6. Wang, D., Bolton, J. and Hofmann, R. (2012) The UV/Chlorine advanced oxidation process for the destruction of trichloroethylene in drinking water. Water Research, 46:15:4677‐4686.
  7. Lakghomi, B., Lawryshyn, Y. and Hofmann, R. (2012) Importance of flow stratification and bubble‐bubble interaction in the separation zone of dissolved air flotation. Water Research, 46:14:4468‐4476.
  8. Simhon, M.V., Minnery, J.G., Hofmann, R. (2012) Adenovirus control in small drinking water systems: risks and strategies. Journal of Water Technology: Research and Supply—Aqua, 61:2:94‐102.
  9. Watts, M.J., Hofmann, R., and Rosenfeldt, E.J. (2012) Low‐pressure UV/Cl2 for advanced oxidation of taste and odor. Journal of the American Water Works Association, 104:1:47‐48.
  10. Hofmann, R., Amiri, F., Wilson, S., Garvey, E., Metcalfe, C., Ishida, C., and Lin, K. (2011) Comparing methods to remove emerging contaminants and disinfection by‐product precursors at pilot scale. Journal of Water Technology: Research and Supply—Aqua, 60:7:425‐433.
  11. Cantwell, R., and Hofmann, R. (2011) Errors in UV Fluence Calculations due to Particles in Wastewater Samples. Environmental Engineering Science, 28:2:159‐162.
  12. Cantwell, R., and Hofmann, R. (2011) Ultraviolet Absorption Properties of Suspended Particulate Matter in Untreated Surface Water.Water Research, 45:3:1322‐1328.
  13. Cantwell, R., Hofmann, R., Rand, J., Devine, P. and VanderMarck, M. (2010) Case Study of Particle‐Related UV Shielding of Microorganisms when Disinfecting Unfiltered Surface Water. Water Quality Research Journal of Canada, 45:3:343‐351.
  14. Wojcicka, L., Baxter, C. and Hofmann, R. (2009) Impact of Particulate Matter on Distribution System Disinfection Efficacy. Water Quality Research Journal of Canada, 43:1:55‐62.
  15. Templeton, M., Cantwell, R., Quinn, C., Hofmann, R., and Andrews, R.C. (2009) Pilot‐Scale Assessment of the Impacts of Transient Particulate Water Quality Events on the UV Disinfection of Indigenous Total Coliform Bacteria in Drinking Water. Journal of Water Supply: Research and Technology – Aqua, 58:1:11‐20.
  16. Templeton, M.R., Andrews, R.C., and Hofmann, R. (2008) Particle‐Associated Viruses in Water: Impact on Disinfection Processes. Critical Reviews in Environmental Science and Technology, 38:3:137‐164.
  17. Cantwell, R., Hofmann, R., and Templeton, M. (2008) Interactions Between Humic Matter and Bacteria when Disinfecting Water with UV Light. Journal of Applied Microbiology, 105:1:25‐35.
  18. Cantwell, R., and Hofmann, R. (2008) Inactivation of Indigenous Coliform Bacteria in Unfiltered Surface Water by Ultraviolet Light. Water Research, 42:10‐11:2729‐2735.
  19. Alam, M.Z.B., Cantwell, R., Hofmann, R., Andrews, R.C., Rand, J., Gagnon, G. and VanderMarck, M. (2008) Effect of ClO2 Preoxidation on Subsequent Water Treatment Processes. ASCE Journal of Environmental Engineering, 134:6:478‐485.
  20. Betanzo, E., Hofmann, R., Hu, Z., Baribeau, H. and Alam, M.Z.B. (2008). Modeling the Impact of Microbial Intrusion on Secondary Disinfection in a Drinking Water Distribution System. ASCE Journal of Environmental Engineering, 134:4:231‐237.
  21. Hofmann, R. and Andrews, R.C. (2007) Potential Side Effects of Using Ammonia to Inhibit Bromate Formation During the Ozonation of Drinking Water. Journal of Environmental Engineering and Science, 6:6:739‐743.
  22. Templeton, M.R., Andrews, R.C., and Hofmann, R. (2007) Reduction of Particle‐Associated Bacteriophages by Dual‐Media Filtration and UV Disinfection. Water Research, 41:11:2393‐2406.
  23. Rand, J., Hofmann, R., Alam, Z.B., Chauret, C., Cantwell, R., Andrews, R., and Gagnon, G. (2007) A Field Study Evaluation for Mitigating Biofouling with Chlorine Dioxide or Chlorine Integrated with UV. Water Research, 41:9:1939‐1948.
  24. Wojcicka, L., Hofmann, R., Baxter, C., Auvray, I., Liere, J., Miller, T., Baribeau, H., Andrews, R.C. and Chauret, C. (2007) Inactivation of Environmental and Reference Strains of Heterotrophic Bacteria and Escherichia coli O157:H7 by Free Chlorine and Monochloramine.Journal of Water Supply: Research and Technology (Aqua), 56:2:137‐150.
  25. Templeton, M.R., Andrews, R.C., and R. Hofmann (2006) Case Study Comparisons of Computational Fluid Dynamics (CFD) Modeling versus Tracer Testing for Determining Clearwell Residence Times in Drinking Water Treatment. Journal of Environmental Engineering and Science, 5:6:529‐536.
  26. Baxter, C., Hofmann, R., Templeton, M.R., Brown, M. and R.C. Andrews (2006) Inactivation of Adenovirus Types 2, 5, and 41 in Drinking Water by UV Light, Free Chlorine, and Monochloramine. ASCE Journal of Environmental Engineering, 133:1:95‐103.
  27. Hofmann, R. and R.C. Andrews (2006) Impact of H2O2 and (Bi)carbonate Alkalinity on Ammonia's Inhibition of Bromate Formation. Water Research, 40:18:3343‐3348.
  28. Templeton, M.R., Hofmann, R., and R.C. Andrews (2006) UV Inactivation of Humic‐coated Bacteriophages MS2 and T4 in Water. Journal of Environmental Engineering and Science, 5:6:537‐543.
  29. Templeton, M.R., Andrews, R.C., and R. Hofmann (2006) Impact of Iron Particles in Groundwater on the UV Inactivation of Bacteriophages MS2 and T4. Journal of Applied Microbiology, 101:3:732‐741.
  30. Templeton, M.R., Hofmann, R., Andrews, R.C., and G.E. Whitby (2006) Biodosimetry Testing of a Simplified Computational Model for the UV Disinfection of Wastewater. Journal of Environmental Engineering and Science, 5:1:29‐36.
  31. Templeton, M.R., Andrews, R.C., and R. Hofmann (2005) Inactivation of particle‐associated viral surrogates by ultraviolet light. Water Research, 39:15:3487‐3500.
  32. Hofmann, R., Andrews, R.C., and P. Lachmaniuk (2004) Guidelines for Ultraviolet Disinfection of Drinking Water: Considerations for Ontario. Journal of Toxicology and Environmental Health, 67:20‐22:1805‐1812.
  33. Hofmann, R., Andrews, R.C., and G. Ranger (2003) Water Quality and Disinfection Impact of ClO2 Contamination by Free Chlorine: A Case Study. Journal of Environmental Engineering and Science, 3:2:75‐80.
  34. Verhille, S., Hofmann, R., Chauret, C. and R.C. Andrews (2003) Indigenous Bacterial Spores as Indicators of Cryptosporidium Inactivation Using Chlorine Dioxide. Journal of Water and Health, 1:2:91‐100.
  35. Hofmann, R., Larcher, S. and R. Andrews (2002) Effect of Several Natural Water Constituents on Bromate Formation During Ozonation.Water Science and Technology: Water Supply, 2:5‐6:501‐507.
  36. Volk, C.J., Hofmann, R., Chauret, C., Gagnon, G.A., Ranger, G., and R.C. Andrews (2002) Implementation of Chlorine Dioxide Disinfection: Effects of the Treatment Change on Drinking Water Quality in a Full‐Scale Distribution System. Journal of Environmental Engineering and Science, 1:323‐330.
  37. Hofmann, R. and R.C. Andrews (2001) Ammoniacal Bromamines: A Review of Their Influence on Bromate Formation During Ozonation.Water Research, 35:3:599‐604.
  38. Hofmann, R., Andrews, R.C. and Q. Ye (1999) Impact of Giardia Inactivation Requirements on ClO2 By‐Products. Environmental Technology, 20:147‐158.
  39. Hofmann, R., Andrews, R.C. and Q. Ye (1998) Comparison of Spectrophotometric Methods for Measuring Chlorine Dioxide in Drinking Water. Environmental Technology, 19:761‐773.
  40. Bagley, D.M. and R. Hofmann (1998) Discussion: Environmental Impacts of Nutrient Removal Processes: Case Study. ASCE Journal of Environmental Engineering, 124:5:481.