Margaret Walsh - Faculty

Dr. Walsh graduated from the Technical University of Nova Scotia (TUNS) in 1993 with a Bachelor in Chemical Engineering and McGill University in 1994 with a Master of Engineering degree. After working in the specialty chemical industry for seven years, she completed her PhD degree in Civil Engineering at Dalhousie University in 2005. Her research is within the water and wastewater treatment field. Dr. Walsh is currently serving as the Technical Director on the Board of Directors for the Atlantic Canada Water and Wastewater Association (ACWWA), and is also the Regional Director Atlantic for the Executive Committee and Board of Directors for the Canadian Association on Water Quality (CAWQ).



Drinking Water Treatment


  • Coagulation and ion exchange pretreatment for membrane filtration
  • Membrane Integrity monitoring and failure detection
  • Reclamation of backwash water and concentrate streams

Water Treatment Plant Residuals

  • Filter backwash water (FBWW) recovery and reuse
  • Impact of FBWW recycle on WTP operations & finished water quality
  • Recovery of backwash water wastes from membrane systems

Wastewater Treatment

  • Active treatment systems for acid mine drainage (AMD)
  • Offshore oil and gas produced water treatment



2002-05  Ph.D., Civil Engineering
Dalhousie University, Halifax, NS, Canada

1993-94  M.Eng., Chemical Engineering, Pulp & Paper Center
McGill University, Montreal, QC, Canada

1990-93  B.Eng., Chemical Engineering
Technical University of Nova Scotia, Halifax, NS, Canada

1988-90  Engineering Diploma
St. Francis Xavier University, Antigonish, NS, Canada




Undergraduate Courses

  • CIVL4440 - Water and Wastewater Treatment
  • CIVL4460 - Solid Waste Management
  • ENGI2300 - Fluid Mechanics
  • CPST3030 - Engineering and Society II

Graduate Courses

  • CIVL6115 - Water Treatment Plant Design
  • CIVL6116 - Biological Waste Treatment


Journal Papers

Gora, S.L. and M.E. Walsh (2011) Recycle of waste backwash water in ultrafiltration drinking water treatment processes, In press, Journal of Water Supply: Research & Technology – AQUA, In press.

N. McCormick, M. Porter and M.E. Walsh (2010) Disinfection by-products in filter backwash water: implications to water quality in recycle designs, Water Research, 44(15): 4581-4589.

Mackie, A., Boilard, S., Walsh, M.E. and C.B. Lake (2009) Physicochemical characterization of cement kiln dust (CKD) for potential reuse in acidic wastewater treatment, Journal of Hazardous Materials, 173: 283-291.

Walsh, M.E., N. Zhao, N., Gora, S.L. and G.A. Gagnon (2009) Effect of coagulation and flocculation conditions on water quality in an immersed ultrafiltration process, Environmental Technology, 30(9): 927-938.

Gottfried, A., Sheppard, A.D., Hardiman, K. and M.E. Walsh (2008) Impact of recycling filter backwash water on organic removal in coagulation-sedimentation processes, Water Research, 42(18): 4683-4691.

Walsh, M.E., Lake, C.B. and G.A. Gagnon (2008) Strategic options for the sustainable management of water treatment plant waste residuals, Journ. Env. Eng. & Sci., 7(1): 45-52.

Conference Proceedings and Presentations

Walsh, M.E. and L. McDermott (2010) Bench-scale evaluation of combined magnetic ion exchange (MIEX) and coagulation for disinfection by-product precursor removal. 14th Canadian National Conference and 2nd Policy Forum on Drinking Water, Saskatoon, SK, October 30 – November 2, 2010.

Mackie, A., Farmer, H. and M.E. Walsh (2010) Mine water treatment with cement kiln dust, International Mine Water Association (IMWA) Symposium, Sydney, Nova Scotia, September 5-12, 2010.

McCormick, N., Younker, J., Mackie, A. and M.E. Walsh (2010) Data review from full-scale installations for water treatment plant residuals treatment processes, American Water Works Association Annual Conference (ACE), Chicago, IL, USA, June 20-24, 2010.

Mackie, A., Porter, M. and M.E. Walsh (2009) Bench-scale evaluation of coagulant program design in dissolved air flotation (DAF) systems, Atlantic Canada Water and Wastewater Association (ACWWA) Annual Conference, Halifax, Nova Scotia, Canada, October 2009.

Walsh, M.E. and C.B. Lake (2008) Investigation into the Use of Cement Kiln Dust (CKD) for Wastewater Treatment. Portland Cement Association, Manufacturing Technical Committee Meeting, IEEE-IAS Cement Industry Technical Conference, Miami, FL, May 18 – 22, 2008.

Gottfried, A. and M.E. Walsh (2008) Natural organic matter removal in coagulation-sedimentation processes with backwash water recycle, AWWA Water Quality & Technology Conference, Cincinnati, OH, November 16 – 20, 2008.

Gora, S.L., Chaulk, M. and M.E. Walsh (2008) Recycling membrane backwash water: effects on recovery, coagulant demand and organic removal in UF membrane filtration, 24th CAWQ Eastern Canada Symposium, Canadian Association on Water Quality (CAWQ), Montreal, PQ, Nov. 7, 2008.