News and events - Tampere University of Technology

Nitrogen removal bioprocesses for the treatment of acidic and heavy-metal containing wastewaters

For his dissertation, MSc Gang Zou has developed the nitrogen removal bioprocesses in fluidized-bed reactors (FBRs) and demonstrated their feasibility for treating wastewaters that have a low pH and contain heavy metals in Nordic climate conditions.

The contamination of nitrogen compounds (i.e. NH4+, NO2-, and NO3-) in drinking and wastewaters leads to human health and environmental concerns (i.e. eutrophication) in water bodies. Conventional technology (i.e. activated sludge process) is not suitable for the treatment of wastewaters with low pH and high concentrations of heavy metals. Mining waters, for instance, are usually acidic and contain heavy metals as well as nitrogen compounds due to the use of ammonium nitrate fuel explosives and cyanide as leaching agents in mines.

Public defence of a doctoral dissertation on Friday, 11 September

The doctoral dissertation of MSc (Tech) Gang Zou in the field of bioengineering titled “Biological nitrogen removal from acidic, heavy-metal containing waters” will be publicly examined at the Faculty of Natural Sciences of Tampere University of Technology (TUT) in the Festia building, Auditorium Pieni Sali 1 (address: Korkeakoulunkatu 8, Tampere, Finland) at 12:00 on Friday, 11 September 2015.

The opponent will be Associate Professor Erkan Sahinkaya (Istanbul Medeniet University, Istanbul, Turkey). Professor Jaakko Puhakka from Department of Chemistry and Bioengineering at TUT will act as Chairman.

Further information:

Gang Zou, tel. +358 40 445 1326,

The dissertation is available online at:

News submitted by: Anna Naukkarinen
Keywords: science and research, dissertation, gang zou