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Abstract
The use of biofilms to improve the removal of organic micropollutants in waste¬water treatment plants (WWTPs) has been investigated. The work is divided into two parts. In the first part, the use of biofilms for the biological degradation of micro¬pollutants was investigated. In the second part, micropollutant removal was investigated with biofilm processes in combination with ozonation or activated carbon.
The results of the first part showed that additional biological treatment in an innovative process design utilizing a moving bed biofilm reactor (MBBR) increased the degradation rate of several micropollutants. However, further process development is needed to achieve efficient removal of a wide range of micropollutants in full-scale applications at WWTPs.
The results of the second part showed that micropollutants were primarily removed by ozonation when combined with post-treatment in an MBBR. A group of N-oxide transformation products was formed during ozonation and remained stable throughout the MBBR post-treatment. Furthermore, when adding powered activated carbon (PAC) in a nitrifying MBBR, the micropollutants were removed by adsorption onto the PAC, and the biological nitrification was uninhibited by the addition of PAC. Finally, adsorption profiles of micropollutants in a granular activated carbon (GAC) filter were obtained and the biofilm that developed in the filter was able to degrade certain micropollutants such as naproxen, sulfamethoxazole, and diclofenac.
The results of the first part showed that additional biological treatment in an innovative process design utilizing a moving bed biofilm reactor (MBBR) increased the degradation rate of several micropollutants. However, further process development is needed to achieve efficient removal of a wide range of micropollutants in full-scale applications at WWTPs.
The results of the second part showed that micropollutants were primarily removed by ozonation when combined with post-treatment in an MBBR. A group of N-oxide transformation products was formed during ozonation and remained stable throughout the MBBR post-treatment. Furthermore, when adding powered activated carbon (PAC) in a nitrifying MBBR, the micropollutants were removed by adsorption onto the PAC, and the biological nitrification was uninhibited by the addition of PAC. Finally, adsorption profiles of micropollutants in a granular activated carbon (GAC) filter were obtained and the biofilm that developed in the filter was able to degrade certain micropollutants such as naproxen, sulfamethoxazole, and diclofenac.
| Original language | English |
|---|---|
| Qualification | Doctor |
| Supervisors/Advisors |
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| Award date | 2022 Dec 7 |
| Place of Publication | Lund |
| Publisher | |
| ISBN (Print) | 978-91-7422-908-0 |
| ISBN (electronic) | 978-91-7422-909-7 |
| Publication status | Published - 2022 Dec 7 |
Bibliographical note
Defence detailsDate: 2022-12-07
Time: 09:00
Place: Lecture Hall Stora hörsalen, IKDC, Sölvegatan 26, Faculty of Engineering LTH, Lund University, Lund. The dissertation will be live streamed, but part of the premises is to be excluded from the live stream.
External reviewer(s)
Name: McArdell, Christa
Title: Dr.
Affiliation: Swiss Federal Institute of Aquatic Science and Technology, Switzerland.
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Subject classification (UKÄ)
- Water Treatment
Free keywords
- wastewater treatment
- wastewater
- biofilm
- ozonation
- activated carbon
- powdered activated carbon
- granular activated carbon
- biological degradation
- Moving bed biofilm reactor
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Dive into the research topics of 'Perspectives on Biofilms for the Removal of Organic Micropollutants in Wastewater'. Together they form a unique fingerprint.Research output
- 4 Article
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Digging deep into a GAC filter – Temporal and spatial profiling of adsorbed organic micropollutants
Edefell, E., Svahn, O., Falås, P., Bengtsson, E., Axelsson, M., Ullman, R. & Cimbritz, M., 2022 Jun 30, In: Water Research. 218, 118477.Research output: Contribution to journal › Article › peer-review
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Promoting the degradation of organic micropollutants in tertiary moving bed biofilm reactors by controlling growth and redox conditions
Edefell, E., Falås, P., Torresi, E., Hagman, M., Cimbritz, M., Bester, K. & Christensson, M., 2021 Jul, In: Journal of Hazardous Materials. 414, 125535.Research output: Contribution to journal › Article › peer-review
Open Access -
MBBRs as post-treatment to ozonation: Degradation of transformation products and ozone-resistant micropollutants
Edefell, E., Falås, P., Kharel, S., Hagman, M., Christensson, M., Cimbritz, M. & Bester, K., 2021 Feb 1, In: Science of the Total Environment. 754, 142103.Research output: Contribution to journal › Article › peer-review
Open Access