dc.contributor.author | Sauter, Daniel | |
dc.contributor.author | Stange, Claudia | |
dc.contributor.author | Schumacher, Vera | |
dc.contributor.author | Tiehm, Andreas | |
dc.contributor.author | Gnirrs, Regina | |
dc.contributor.author | Wintgens, Thomas | |
dc.date.accessioned | 2022-03-25T16:16:03Z | |
dc.date.available | 2022-03-25T16:16:03Z | |
dc.date.issued | 2021 | |
dc.identifier.doi | 10.1039/d1ew00312g | |
dc.identifier.uri | https://irf.fhnw.ch/handle/11654/33395 | |
dc.description.abstract | Ozonation is an established process for advanced wastewater treatment, with a dose-dependent degree of
disinfection. It is generally followed by biological post-treatment with the main objective of oxidation by-
product abatement. However, there is little research on the impact of the combination of ozonation and
biological post-treatment on microbiological quality parameters. This long-term study investigated pilot-
scale ozonation with six different filtration processes (4 deep-bed filter systems and 2 vertical flow
constructed wetlands) as biological post-treatment. A broad spectrum of microbial parameters has been
monitored for a comprehensive evaluation of the disinfection performance. While vegetative bacteria
(Escherichia coli and enterococci) were inactivated to a large extent by ozone, spore-forming Clostridium
perfringens and viral indicator somatic coliphages exhibited a high ozone tolerance and could only be
effectively retained in subsequent filtration steps. Extended hydraulic retention times as well as fine filter
materials in post-treatment proved to be beneficial for faecal indicator abatement. In deep-bed filters,
coagulant dosing was an additional important factor for the disinfection performance. Post-treatment also
played a crucial role in the reduction of the antibiotic resistance gene sul1 and the indicator genes intl1
(mobile genetic element) and 16S rRNA (total bacterial number), whereas inactivation of antibiotic resistant
bacteria was dominated by the ozonation process. In summary, the combined disinfection mechanisms of
ozonation (chemical) and filtration (physical) resulted in an effective abatement of a wider range of
microbial parameters than the individual processes. Regrowth during post-treatment has only been
observed for the parameters intact cell counts and Pseudomonas aeruginosa with mean concentration
increases of 0.5–1 log units. | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | Royal Society of Chemistry | en_US |
dc.relation.ispartof | Environmental Science. Water, Research & Technology | en_US |
dc.accessRights | Anonymous | * |
dc.title | Impact of ozonation and biological post. Treatment of municipal wastewater on microbiological quality parameters | en_US |
dc.type | 01 - Zeitschriftenartikel, Journalartikel oder Magazin | * |
dc.volume | 7 | en_US |
fhnw.publicationState | Published | en_US |
fhnw.ReviewType | Anonymous ex ante peer review of a complete publication | en_US |
fhnw.InventedHere | Yes | en_US |
fhnw.pagination | 1643-1656 | en_US |
fhnw.IsStudentsWork | no | en_US |