1 Section for Sustainable Biotechnology, Copenhagen, The Faculty of Engineering and Science, Aalborg University, VBN2 Department of Chemistry and Bioscience, The Faculty of Engineering and Science, Aalborg University, VBN3 Aalborg University Copenhagen, The Faculty of Humanities, Aalborg University, VBN4 Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC-IG). Avenida Padre García Tejero 4, 41012 Seville5 Chemical Engineering Department, Extremadura University (UEx). Avenida de Elvas S/N, 06071 Badajoz6 Department of Environmental Science, University Ca´Foscari of Venice. Calle Larga Santa Marta, 2137-30123, Venice7 Organic Waste System N.V. Dok Noord 4, 9000 Gent8 Department of Environmental Engineering, Middle East Technical University. Inönü Bulvari, 06531Ankara9 Department of Environmental Engineering, Technical University of Crete. 73100 Chania10 Biotechnology Research Institute, National Research Council of Canada, 6100 Royalmount, Montreal, H4P 2R211 Department of Water Technology and Environmental Engineering, Institute of Chemical Technology Prague. Technická 5, 16628 Prague12 Cemagref, Environmental Management and Biological Treatment of Wastes Research Unit. 17, 35044 Rennes Cedex13 Department of Chemical Engineering, School of Engineering, University of Santiago de Compostela. Rua Lope Gómez de Marzoa S/N, 15782 Santiago de Compostela14 DIIAR-Environmental Section, Politecnico di Milano, Via C. Golgi, 20133 Milano15 GIRO Technological Centre. Rambla Pompeu Fabra 1, 08100 Mollet del Valles, Barcelona16 Institute of Water Quality Control, Technical University of Munich. Am Coulombwall, 85748 Garching17 Sub-department of Environmental Technology, Wageningen University, Bomenweg 2, 6703 HD Wageningen
Chemical oxygen demand (COD) is a critical analytical parameter in the field of waste and wastewater treatment processes, and more specifically in anaerobic digestion processes. However, little is known about the COD measurement quality of anaerobic digestion samples. Taking into account the lack of a general standard method and high quality certified reference materials (CRMs), currently the traceability of the COD determination in such samples is not easy to check. Proficiency testing (PT) is a powerful tool that can be used to test the performance that the participant’s laboratories can achieve. Two PTs related with COD determination have been organised, and the results reported have been compared; showing the importance of continuous participation in proficiency testing (PT) schemes in order to improve the results obtained.
Anaerobic digestion; chemical oxygen demand; proficiency testing; solid samples