Deep-bed filters as post-treatment for ozonation in tertiary municipal wastewater treatment. Impact of design and operation on treatment goals
Authors
Sauter, Daniel
Dabrowska, Agata
Bloch, Robert
Stapf, Michael
Miehe, Ulf
Sperlich, Alexander
Gnirss, Regina
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
2021
Issue / Number
7
Pages / Duration
197-211
Patent number
Publisher / Publishing institution
Royal Society of Chemistry
Place of publication / Event location
Edition
Version
Programming language
Assignee
Practice partner / Client
Abstract
Ozonation followed by biological post-treatment is an established technology for abatement of organic micropollutants (OMP) from municipal wastewater. Although the necessity of biological post-treatment for oxidation by-product (OBP) removal is widely accepted, there is still discussion about the appropriate design and operation. The presented pilot-study investigates the impact of filter material and contact time on the removal efficiency of bulk organics, OMP, and OBP in three different deep-bed filters operated in parallel as post-treatment after ozonation (biological activated carbon (BAC) filter, dual-media filter sand/BAC and dual-media filter sand/anthracite). The use of BAC instead of non-adsorptive filter material resulted in higher removal of DOC and dissolved oxygen which indicates increased biological activity. Moreover, both BAC containing filters showed additional removal for a number of OMP even at high treated bed volumes of >50 000 whereas no removal was observed in the sand/anthracite filter. Analysis of N-nitrosodimethylamine (NDMA) and several carbonyl compounds revealed a clear formation of these biodegradable OBP during ozonation. A strong correlation was found between carbonyl formation and the specific ozone dose. Removal of OBP in the sand/BAC and the sand/anthracite filter was tested at different empty bed contact times (EBCT). While NDMA was efficiently removed independent of EBCT changes, there was a slightly negative impact of shorter EBCT on the reduction of carbonyl compounds. Furthermore, it was demonstrated that the integration of enhanced phosphorus removal into post-treatment is feasible with relatively low efforts by inline coagulant dosing (FeCl3) in the filter influent.
Keywords
water, filtration, ozonation, wastewater, water pollutants
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
Hybrid
License
Citation
WINTGENS, Thomas, Daniel SAUTER, Agata DABROWSKA, Robert BLOCH, Michael STAPF, Ulf MIEHE, Alexander SPERLICH und Regina GNIRSS, 2021. Deep-bed filters as post-treatment for ozonation in tertiary municipal wastewater treatment. Impact of design and operation on treatment goals. Environmental Science. Water, Research & Technology. 2021. Bd. 2021, Nr. 7, S. 197–211. DOI 10.1039/d0ew90056g. Verfügbar unter: https://doi.org/10.26041/fhnw-4108