Article (Scientific journals)
Dynamic assessment of the floc morphology, bacterial diversity and integron content of an activated sludge reactor processing hospital effluent
Stalder, Thibault; Alrhmoun, Moussab; Louvet, Jean-Noël et al.
2013In Environmental Science and Technology
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Abstract :
[en] The treatment of hospital effluents (HE) is a major concern, as they are suspected of disseminating drugs and antibiotic resistance determinants in the environment. In order to assess HE influence on wastewater treatment plant biomass, lab scale conventional activated sludge systems (CAS) were continuously fed with real HE or urban effluent as a control. To gain insights into the main hurdles linked to HE treatment, we conducted a multiparameter study using classical physicochemical characterization, phase contrast and confocal laser 35 scaning microscopy, and molecular biology (i.e. pyrosequencing) tools. HE caused erosion of floc structure and the production of extracellular polymeric substances attributed to the development of floc forming bacteria. Adaptation of the sludge bacterial community to the HE characteristics, thus maintaining the purification performance of the biomass, was observed. Finally, the comparative metagenomic analysis of the CAS showed that HE 40 treatment resulted in an increase of class 1 resistance integrons (RIs) and the introduction of Pseudomonas spp. into the bacterial community. HE treatment did not reduce the CAS process performance; nevertheless it increases the risk of dissemination into the environment of bacterial species and genetic determinants (RIs) involved in antibiotic resistance acquisition.
Disciplines :
Chemical engineering
Author, co-author :
Stalder, Thibault
Alrhmoun, Moussab
Louvet, Jean-Noël ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Mécanique et construction
Casellas, Magali
Maftah, Corinne
Carrion, Claire
Pahl, Ole
Ploy, Marie-Cécile
Dagot, Christophe
Language :
English
Title :
Dynamic assessment of the floc morphology, bacterial diversity and integron content of an activated sludge reactor processing hospital effluent
Publication date :
2013
Journal title :
Environmental Science and Technology
ISSN :
0013-936X
eISSN :
1520-5851
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 June 2013

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