Priv. Doz. Dr. Joachim Clemens

		Priv. Doz. Dr. Joachim Clemens Anschrift: Universität Bonn INRES - Institut für Nutzpflanzenwissenschaften  und Ressourcenschutz Bereich Pflanzenernährung Karlrobert-Kreiten-Strasse 13 D-53115 Bonn Email: clemensgewitra.de Tel: Fax:
Education:		2003: Habilitation:  Stickstoffflüsse in biologischen Abfallanlagen 1997: PhD – thesis at Bayreuth University:  "Lachgasemissionen aus Fäkalien" / „Nitrous Oxide emissions from feaces“
Positions held:		since 2010: CEO of the company gewitra 2003 – 2009: Assistant Professor at the Institute of Crop Science and Resource Conservation, Dept. of Plant Nutrition, University of Bonn, Germany 1998 – 2003: Scientist  at the Institute of Agricultural Chemistry, University of Bonn, Germany 1994 – 1997: Research Assistant, Department of Biogeography and Agricultural Ecology, University of Bayreuth, Germany Student  Wissenschaftliche Interessen
Research focus:		recycling of organic wastes, greenhouse gas emissions, water ressources
Professional activities:		First supervisor of four PhD students and 33 Diploma/MSc. students and  currently supervising 6 PhD students Project leader and coordinator of different projects Memberships: German Society of Plant Nutrition (DGP), International Water Association (IWA), German Association of water, wastewater and water (DWA) Member in different working groups about decentralised water systems (DWA) and biogas (KTBL)

selected Publications:

WINKER M., VINNERÅS B., MUSKOLUS A., ARNOLD U., CLEMENS J (2009):  Fertiliser products from new sanitation systems: Their potential values and risks. Bioresource Technology, Vol. 100, Issue 18, 4090-4096

YEN-PHI, V. T., J. CLEMENS, A. RECHENBURG, B. VINNERAS, C. LENßEN & T. Kistemann (2009): Hygienic Effects and Gas Production of Plastic Bio-digesters under Tropical Conditions. Journal of Water and Health, 7 (4), 590-596

HAMMER H., CLEMENS J. (2007): A tool to Evaluate the Fertiliser Value and the Environmental Impact of Substrates from Wastewater Treatment, Water Science & Technology Vol 56 No 5 201–209

CLEMENS J., TRIMBORN M., WEILAND P., AMON B. (2006): Mitigation of Greenhouse Gas Emissions by Anaerobic Digestion of Cattle Slurry, Agriculture, Ecosystems and Environment, 112, 171-177

SIMONS J., CLEMENS J. (2004): The use of separated human urine as mineral fertilizer, 595-600; in (eds.) Werner et al.: ecosan-closing the loop, 7.-11. April, 2003, Lübeck, Germany, ISBN 3-00-012791-7

SCHERER H.W., GOLDBACH H.E., CLEMENS J. (2003): Potassium dynamics in the soil and yield formation in a long-term field experiment. Plant, Soil and Environment, 49, 531-535

CLEMENS J., CUHLS C. (2003): Greenhouse Gas Emissions from Mechanical and Biological Waste Treatment of Municipal Waste, Environmental Technology, 24, 745-754

CLEMENS J., BERGMANN S., VANDRÉ R. (2002): "Reduced Ammonia Emissions from Slurry after Self-Acidification with Organic Supplements", Environmental Technology, 29, 429-435

WULF S., MAETING M., CLEMENS J. (2002): Effect of application technique on the emission of trace gases (NH3, CH4, N2O) after spreading co-fermented slurry on arable and grassland; Part I: Ammonia volatilization, Journal of Environmental Quality, 31, 1789-1794

WULF S., MAETING M., CLEMENS J. (2002): Effect of application technique on the emission of trace gases (NH3, N2O, CH4) after spreading co-fermented slurry on arable and grassland; Part II: Greenhouse gas emissions, Journal of Environmental Quality, 31, 1795-1801

WULF S., MAETING M., BERGMANN S., CLEMENS J. (2001): Simultaneous Measurement of NH3, N2O, and CH4 to assess efficiency of trace gas emission abatement after slurry application, Phyton, 41, 131-142

CLEMENS J., AHLGRIM H.J. (2001): Greenhouse Gases from Animal Husbandry, Nutrient Cycling in Agroecosystems, 60, 287-300

CLEMENS J., HUSCHKA A. (2001): The Effect of Biological Oxygen Demand of Cattle Slurry and Soil Moisture on Nitrous Oxide Emissions, Nutrient Cycling in Agroecosystems, 59:193-198

CLEMENS J, SCHILLINGER M.P., GOLDBACH H.; HUWE B. (1998): Spatial Variability of Nitrous Oxide Emissions and Soil Parameters - A Field Study, Biology and Fertility of Soils, 28:403-406

CLEMENS J., BURKHARDT J., GOLDBACH H. (1997): Abiogenic nitrous oxide formation on aerosols, Atmosph. Environ., 31, 2961-2964

CLEMENS J., VANDRÉ R., KAUPENJOHANN M., GOLDBACH H. (1997): Ammonia and nitrous oxide emissions after landspreading of slurry as influenced by application technique and dry matter-reduction. II Short term nitrous oxide emissions, Z. Pflanzenernähr. Bodenk., 160, 491-491.

CLEMENS J., HAAS B. (1997): Nitrous Oxide emissions from sewers, Acta hydrochem. hydrobiol., 25, 2, 96-99

VANDRÉ R., CLEMENS J., GOLDBACH H., KAUPENJOHANN M. (1997): Ammonia and nitrous oxide emissions after landspreading of slurry as influenced by application technique and dry matter-reduction. I NH3, Z. Pflanzenernähr. Bodenk., 160, 303-307

VANDRÉ R., CLEMENS J. (1997): Studies on the relationship between slurry, pH, volatilization process and the influence of acidifying additives, Nutrient Cycling in Agroecosystems, 47, 157-165

Private Homepage:
http://www.gewitra.de