M. Hesselsøe

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Sewage sludge is frequently applied as fertilizers to cultivated land. However, municipal sewage sludge often contains organic contaminants including nonylphenol (NP), an intermediate from nonionic surfactant degradation. Knowledge about NP degradation in sludge-amended soil is an important prerequisite for adequate risk assessments. In this study,(More)
Indigenous ammonia-oxidizing bacteria (AOB) in a clay loam soil were extremely difficult to release from soil particles compared to most heterotrophic bacteria; less than 1% of indigenous AOB (estimated as potential ammonia oxidation rate) were extractable by the dispersion-density-gradient centrifugation technique. This is at least 10-fold less than the(More)
Strong inhibitory effects of the anionic surfactant linear alkylbenzene sulfonate (LAS) on four strains of autotrophic ammonia-oxidizing bacteria (AOB) are reported. Two Nitrosospira strains were considerably more sensitive to LAS than two Nitrosomonas strains were. Interestingly, the two Nitrosospira strains showed a weak capacity to remove LAS from the(More)
 Litterbags with clover leaves in soil were buried in the field to study the influence of degrading clover leaves on the development of elevated nitrification activity (hot-spots) in space and time. Potential NH3 oxidation activity indicating the population size of ammonia-oxidizing bacteria was measured in soil samples taken in a zone a few millimetres(More)
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