1. Dep. of Biotechnology; Chemistry and Environmental Engineering Aalborg Univ.; Sohngaardsholmsvej 57 DK-9000 Aalborg Denmark
2. Dep. of Agroecology and Environment Faculty of Agricultural Sciences; Aarhus Univ.; Blichers Allé 20 P.O. Box 50 DK-8830 Tjele Denmark
3. Dep. of Civil and Environmental Engineering; Graduate School of Science and Engineering Saitama Univ.; 255 Shimo-okubo Sakura-ku Saitama 338-8570 Japan