Impact of ozonation and biological post. Treatment of municipal wastewater on microbiological quality parameters
No Thumbnail Available
Authors
Author (Corporation)
Publication date
2021
Typ of student thesis
Course of study
Collections
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Environmental Science. Water, Research & Technology
Special issue
DOI of the original publication
Link
Series
Series number
Volume
7
Issue / Number
Pages / Duration
1643-1656
Patent number
Publisher / Publishing institution
Royal Society of Chemistry
Place of publication / Event location
Edition
Version
Programming language
Assignee
Practice partner / Client
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.
Keywords
Subject (DDC)
Event
Exhibition start date
Exhibition end date
Conference start date
Conference end date
Date of the last check
ISBN
ISSN
2053-1419
2053-1400
2053-1400
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Closed
License
Citation
SAUTER, Daniel, Claudia STANGE, Vera SCHUMACHER, Andreas TIEHM, Regina GNIRRS und Thomas WINTGENS, 2021. Impact of ozonation and biological post. Treatment of municipal wastewater on microbiological quality parameters. Environmental Science. Water, Research & Technology. 2021. Bd. 7, S. 1643–1656. DOI 10.1039/d1ew00312g. Verfügbar unter: https://irf.fhnw.ch/handle/11654/33395