March 2004: "International Workshop on Implementation and operation of municipal wastewater reuse plants, Thessaloniki, Greece by Theo Claassen (link to the conference)
June 3, 2004: the second Leading-Edge Conference on Water and Wastewater Treatment Technologies, download the paper, download the presentation and the sheets used during the discussion
July 29, 2004: a special Waterharmonica session on the 7th Intecol Conference on Wetlands in Utrecht
September 30, 2004: keynote speech on the NVA & IWA - Upgrading Waste Water Treatment Plants, Aquatech, Amsterdam (link)
October 29, 2004: EAWAG-seminar "Urban water management in transition", EAWAG, Zurich, Switzerlandą , presentation available through: EAWAG_presentation_Waterharmonica, (link to Freitags Seminarien)
January 24, 2005: A digital tool to monitor population dynamics development of counting methods for Daphnia populations and possible use for other organisms, Vrije Universiteit, Amsterdam: link
Februari 6, 2005: De voordelen van poep, "poep is pas vies als iemand anders er met zijn handen aan gezeten heeft", lezing in het Museum Joure: sheets
April 13 and 14, 2005: International Workshop Purification of Interreg Urban Water Cycle project, The Netherlands: Introduction by Theo Claassen in Leeuwarden and Presentation by Ruud Kampf in Den Helder, before the Texel visit
April 22, 2005: PAO-cursus Stikstofverwijdering uit afvalwater, Stichting Postacademisch Onderwijs PAO-TU-Delft, les: Stikstofverwijdering in natuurlijke systemen en de Waterharmonica (in Dutch), (link to PAO)
May 2, 2005: Venice University, an overview of the Waterharmonica and the Grickleback process: the complete presentation of a two hour college
May 19, 2005: PAO-cursus "Meer dan effluent", Stichting Postacademisch Onderwijs PAO-TU-Delft, les: "Van efflluent naar oppervlaktewater", (in Dutch), (link to PAO)
July 11, 2005: The presentation by Chanzi Hamidar, a Tanzanian student Saxion University, Deventer about possible values of the Waterharmonia in Tanzania: sheets
October 21, 2005: a workshop on the Empuriabrava constructed wetland in Spain: link to the workshop
September 23, 2009: 3rd Wetland Pollutant Dynamics and Control WETPOL 2009, 20 - 24 September 2009, Barcelona: http://www.ccbgi.org/activitats.php#id_24
November 4, 2009: WSB cursus natuurlijke zuivering, Wageningen Business School: link
November 19, 2009: Jornada "Aigua a la carta. Processos i tecnologies: L'adequació de la qualitat de les aigües als diferents usos": http://www.ccbgi.org/activitats.php#id_28
November 23, 24 en 23, 2009:
Workshop Ecosanitatie in Suriname,
Eenvoudige waterzuivering en gebruik van gezuiverd afvalwater, Wat te doen in aanvulling op Ecosanitatie: link to the workshop and report of the internship of Tjalling Vlieg
December 4, 2009:
IEES Workshop: ‘Benefits of Ecological Engineering Practices’, Paris, France:
Application of constructed wetlands to transfer treated wastewater into natural values in the Netherlands and Spain
Presentations 2010
April 19, 2010: IWA conference on Sustainable Solutions for Small Water and Wastewater Treatment Systems (S2Small2010) Girona, Spain: The oxidation ditch a simple waste water treatment process a personal history with a future (link to conference)
September 2-4, 2010: Workshop IEES "Ecological Engineering and the Urban Landscape"