Barjenbruch, M., Geyer, P.: Potential der P-Elimination auf Kläranlagen – im Kontext der Zielerreichung der WRRL; Landesverbandstagung der DWA Sachsen-Thüringen, Chemnitz, 07.05.2015.

Sperlich, A., Geyer, P., Gnirss, R., Barjenbruch, M.: Combined removal of nutrients and suspended solids in a dual-media post-denitrification filter as additional process step of wastewater treatment plants; IWA 9th International Conference on Biofilm Reactors, Paris, May 28-31 2013.

Sperlich, A., Geyer, P., Gnirss, R., Barjenbruch, M.: Pilot-scale coagulation/filtration of WWTP effluent to remove phosphorus suspended solids and COD; IWA IWA International Conference on Particle Separation “Advances in Particle Separation – Science Technology Practice", Berlin, 18.-20.06.2012.

Geyer, P., Sperlich, A., Gnirss, R., Barjenbruch, M.: Combined removal of nutrients and suspended solids in a dual-medium biological filter to improve the effluent quality of WWTPs; Tongji University IWA Biofilm Conference 2011: Processes in Biofilms, Shanghai, China, October 27-30th.

Barjenbruch, M., Exner, E, Geyer, P.: Biological Activated Filters in Wastewater Treatment – A Useful Process for an Efficient Performance; Water Environment Federation (WEF) Biofilm Reactor Technology Conference, Portland, Oregon, USA, August 15–18th 2010.