Prof. X.Y. Li

Chair Professor (Water and Environmental Engineering)
Professor X. Y. LI

BSc (Eng), Tsinghua University, Beijing, China
MS (Eng), Tsinghua Unviersity, Beijing, China
PhD, the University of Arizona, Tucson, U.S.A.



Office: HW 6-01
Phone: +852 2859 2659
Fax: +852 2559 5337


Teaching Activities
  • CIVL2001 Engineering Design and Communication
  • CIVL3011 Municipal and Industrial Wastewater Treatment
  • CIVL3021 Water Resources Engineering
  • CIVL6034 Municipal Wastewater Treatment
  • CIVL6051 Water Quality Modelling


Research Interests
  • Particle phenomena: coagulation
  • Sedimentation and pollutant-sediment interactions
  • Advanced Oxidation Processes (AOP) in water and wastewater treatment and disinfection
  • Membrane technology in water and wastewater treatment


Representative Research / Consultancy Projects
  • Coagulation of screened sewage particulates from marine outfall discharges
  • Electrochemical disinfection of saline sewage effluent: mechanisms and pilot study
  • Nutrient transformation during the decay of settled algae in the ephemeral sediment after algal blooms
  • Sludge granulation in biological wastewater treatment: technology, mechanisms and characterization
  • Characterisation of wastewater organic pollutants as the disinfection by-product precursors in surface water resources


10 Selected Representative Publications
  • Li, X.Y., and Yang, S.F. (2006). "Influence of loosely bound extracellular polymeric substances (EPS) on the flocculation, sedimentation and dewaterability of activated sludge." Water Research, 41, 1022-1030.
  • Li, X.Y., and Wang, X.M. (2006). "Modelling of membrane fouling in a submerged membrane bioreactor." J. Membrane Science, 278, 151-161.
  • Wang, Y.H., Chan, K.Y., Li, X.Y., and So, S.K. (2006). "Electrochemical degradation of 4-chlorophenol at nickel-antimony doped tin oxide electrode." Chemosphere, 65, 1087-1093.
  • Li, X.Y., and Leung, R.P.C. (2005). "Determination of the fractal dimension of microbial flocs from the change in their size distribution after breakage." Environmental Science & Technology, 39, 2731-2735.
  • Chu, H.P., and Li, X.Y. (2005). "Membrane fouling in a membrane bioreactor (MBR): sludge cake formation and fouling characteristics." SBiotechnology & Bioengineering, 90, 323-331.
  • Li, X.Y., Diao, H.F., Fan, X.J., Gu, J.D., Ding, F., and Tong, A.S.F. (2004). "Electrochemical wastewater disinfection: identification of its principal germicidal actions." J. Environmental Engineering , ASCE, 130, 1217-1221.
  • Li, X.Y., Zhang, J.J., and Lee, J.H.W. (2004). "Modelling particle size distribution dynamics in marine waters." Water Research, 38, 1305-1317.
  • Zhang, J.J., and Li, X.Y. (2003). "Modeling particle size distribution dynamics in a flocculation system." AIChE J., 49, 1870-1882.
  • Li, X.Y., Yuan, Y., and Wang, H.W. (2003). "The hydrodynamics of biological aggregates of different sludge ages: An insight into the mass transport mechanisms of bio-aggregates." Environmental Science & Technology, 37, 292-299.
  • Li, X.Y., and Yuan, Y. (2002). "Collision frequencies of microbial aggregates with small particles by differential sedimentation." Environmental Science & Technology, 36, 387-393.


For more information of Ir Professor X.Y. Li , please visit and HKU Scholars Hub.