Applied microbiologist, with interests in applications of expanded and fluidized bed biofilm reactor (EBBR) technology. This technology is currently being applied to wastewater treatment but is also applicable to raw water treatment, fermentation, and biocatalysis.
Microbiology, microbial physiology and metabolism, biological wastewater treatment, factorial experimental design, response surface methodology for process optimisation.
Dempsey, M. J. (2011) Nitrification of Raw or Used Water Using Expanded Bed Biofilm Reactor Technology. In Martin G. Klotz and Lisa Y. Stein, editors: Methods in Enzymology, Vol. 496, Burlington: Academic Press, 2011, pp. 247-267. ISBN: 978-0-12-386489-5
Boltz, J.P., Morgenroth, E., deBarbadillo, C., Dempsey, M., McQuarrie, J., Ghylin, T., Harrison, J., and Nerenberg, R. (2009). Biofilm Reactor Technology and Design. In: Design of Municipal Wastewater Treatment Plants, Volume 2, Fifth Edition. WEF Manual of Practice No. 8, ASCE Manuals and Reports on Engineering Practice No. 76. McGraw Hill. New York, USA. ISBN P/N 978-0-07-166360-1 of set 978-0-07-166358-8 (MHID P/N 0-07-166360-6 of set 0-07-166358-4).
Singer, A.C. ... Dempsey, M.J. et al. (2008) Meeting Report: Risk Assessment of TamifluŽ use under Pandemic Conditions—Report from an Interdisciplinary Workshop. Environmental Health Perspectives 116(11) Nov 2008 doi:10.1289/ehp.11310
Senthilkumar, S.R., Dempsey, M.J., Krishnan, C. and Gunasekaran, P. (2008) Optimization of biobleaching of paper pulp in an expanded bed bioreactor with immobilized alkali stable xylanase by using response surface methodology. Bioresource Technology 99 (16): 7781-7787. http://dx.doi.org/10.1016/j.biortech.2008.01.058
Dempsey, M.J. (2012) An inventor's perspective on the patenting process and spin-out companies. Invited paper, Society for Applied Microbiology Micro-Entrepreneurial Workshop, Glasgow, July 2012
Dempsey, M.J. (2012) Tertiary treatment of wastewater using a complex microbial community in an expanded bed biofilm reactor. Invited paper, Society for General Microbiology Conference, Dublin, March 2012
Dempsey, M. J. (2011) Improvements in and relating to fluid bed expansion and fluidization Australian Patent No. AU 2008 2006 62 (Granted March 3rd 2011: until October 8th, 2022
Dempsey, M. J. (2011) Nitrification Process
Canadian Patent - notification of Grant January 31st, 2011 WO 00/24682A1
Dempsey, M.J. (2010) Fluid bed expansion and fluidisation US Patent 7,708,886
Dempsey, M.J. (2008) Improvements in and relating to fluid bed expansion and fluidisation Australian Patent AU2008200662
Dempsey, M.J., McKeever, C & King, J. (2012) The Expanded Bed Biofilm Reactor (EBBR): Innovative Technology for Sustainable Wastewater Treatment.
IWA Eco-Technologies Conference, Santaigo-de-Compostella, Spain, June 2012
Dempsey, M.J. and Boltz, J.P. (2010) Tertiary Nitrification in an Expanded Bed Biofilm Reactor. WEF/IWA Biofilm Reactor Technology conference, Portland, Oregon, Aug. 2010
M. J. Dempsey, I. D. Akhidime, S. Byrom, M. Guipponi and D. Brazzorrotto (2009) Measurement of microbial activity in biofilms from expanded bed bioreactors. IWA Biofilms: Fundamentals to Applications conference, Davis, Calif., Sept. 2009
M.J. Dempsey and R. J. Minall (2009) Sludge liquor nitrification using expanded bed bioreactor technology. IWA Nutrient Removal conference, Krakow, Poland, Sept. 2009
Akhidime, I.D. and Dempsey, M.J. (2009) Influence of biofilm thickness on ammonia oxidation rate of bioparticles from expanded bed process for tertiary nitrification. IWA Nutrient Removal conference, Krakow, Poland, Sept. 2009
Dempsey, M.J. (2009) Biogas Production: Maximisation of CH4; minimisation of CO2 and N2O. Aqua Enviro Optimising the potential of Biogas conference, Leeds, UK, July 2009
Akhidime, I.D. and Dempsey, M.J. (2009) The influence of biofilm thickness on the nitrification rate of different sizes of particulate biofilms in expanded biological bed process. IWA Young Professionals conference, University College London, April 2009.
Dempsey, M.J., Boltz, J.P. McQuarrie, J., Johnson, B. and Daigger, G.T. (2008) Particulate biofilm technology for wastewater treatment. IWA Biofilm Technologies, Singapore, Jan. 2008.
Dempsey, M.J. (2012) Nitrification: removal of
ammonia from municipal
wastewater. Water and Sewerge Journal Issue 2 2012, pp 45-47 http://tinyurl.com/nitrification-WSJ-2012
Dempsey, M.J. (2011) Advanced Bioprocess Development Ltd
Microbiology Today Spin-out Feature, August 2011, pp. 168-9
Dempsey, M.J. (2011) Nitrification: Microbiological oxidation of toxic ammonia to non-toxic nitrate
Water and Sewerage Journal Issue 2 2011, pp 23-25
Dempsey, M.J. (2008) Expanded Bed Technology for Biological Wastewater Treatment. Aqua Enviro 2nd European Water and Wastewater Management conference, Birmingham, UK, Sept. 2008.
Dempsey, M.J. (2008) Counter-current aeration: halve your energy consumption. Aqua Enviro Energy Saving Strategies for Water & Wastewater Treatment conference, Leeds, UK, April 2008.