1. Center of Microbial Ecology and Technology (CMET) Ghent University Coupure Links 653 9000 Gent Belgium
2. Avecom NV Industrieweg 122P 9032 Wondelgem Belgium
3. The School of Civil Engineering The University of Queensland St. Lucia QLD 4072 Australia
4. KWR Watercycle Research Institute Post Box 1072 3430 BB Nieuwegein The Netherlands