Biological removal of emerging micropollutants in nitrifying activated sludge at low temperatures

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Mikola, Anna, Dr., Aalto University, Department of Built Environment, Finland
dc.contributor.advisor Gonzalez-Martinez, Alejandro, Asst. Prof., University of Granada, Spain Kruglova, Antonina 2018-06-27T09:02:47Z 2018-06-27T09:02:47Z 2018
dc.identifier.isbn 978-952-60-3755-4 (electronic)
dc.identifier.isbn 978-952-60-8059-8 (printed)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.description.abstract Growing concentrations of emerging micropollutants (EMs) such as pharmaceuticals, endocrine disruptors and personal care products are found in the aquatic environment worldwide. These substances could pose the risk on humans and animals due to their chronic ecotoxicity and persistence. The main route of EMs emission into the natural waters is through effluents of wastewater treatment plants (WWTPs). Operational сonditions can significantly affect biodegradation of EMs during wastewater treatment. In particular, low temperature limits biological processes due to slower metabolic reactions and decrease of bacterial diversity in activated sludge. In this thesis, biological removal of EMs from wastewater was studied at low temperatures (8-12°C). Different operational conditions were compared in order to increase removal efficiency and therefore enhance the quality of WWTPs effluents. Laboratory-scale Sequencing Batch Reactors (SBRs) and Membrane Bioreactors (MBRs) were used to mimic existing wastewater treatment processes. Data from full-scale WWTPs of Helsinki region were taken into account. The study presents the removal rates for widely-used EMs ibuprofen, diclofenac, carbamazepine, estrone, 17β-estradiol and 17α-ethynylestradiol. Altogether, obtained removal efficiencies were much lower compared to published data for higher temperatures. Biodegradation studies demonstrated that EMs might accumulate in activated sludge cells at large extent. Depending on the substance, this accumulation could be followed by biodegradation or by return of the compound to the wastewaters with the cell decay. Therefore, following the concentrations of EMs in solid phase of activated sludge is necessary for the assessment of biodegradation potentials. Sludge retention time (SRT) proved to be an effective operational tool for regulating biological processes during wastewater treatment. Prolongation of the SRT demonstrated positive effect on activated sludge performance and EMs biodegradation at low temperatures. At the same time, decrease of the temperature raised the negative pressure effect on activated sludge, limiting the removal potential of EMs as well as inhibiting nitrification. Thus, SRT optimum is closely related to the temperature fluctuations. Contribution of different microorganisms in performance of nitrifying activated sludge and EMs removal at cold temperatures is discussed in this study. In addition to six above mentioned EMs effect of antibiotics sulfadiazine and trimethoprim was studied. Described microbial communities significantly differed from typical nitrifying activated sludge at class level. EM removal potential and the need for further research of bacterial class Deltaproteobacteria and domain Archaea is proposed. Overall, prolongation of SRT improved stress resistance of microbial community resulting in stable performance of activated sludge. en
dc.format.extent 62 + app. 78
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 122/2018
dc.relation.haspart [Publication 1]: Kruglova, A., Ahlgren, P., Korhonen, N., Rantanen, P., Mikola, A., Vahala, R. Biodegradation of ibuprofen, diclofenac and carbamazepine in nitrifying activated sludge under 12 °C temperature conditions. Science of the Total Environment, 2014, 499, 394–401. DOI: 10.1016/j.scitotenv.2014.08.069
dc.relation.haspart [Publication 2]: Kruglova, A., Kråkström M., Riska, M., Mikola, A., Rantanen, P., Vahala, R., Kronberg, L. Comparative study of emerging micropollutants removal by aerobic activated sludge of large laboratory-scale membrane bioreactors and sequencing batch reactors under low-temperature conditions. Bioresource Technology, 2016, 214, 81–88. DOI: 10.1016/j.biortech.2016.04.037
dc.relation.haspart [Publication 3]: Kruglova, A., Gonzalez-Martinez, A., Kråkström M., Mikola A., Vahala. R. Bacterial diversity and population shifts driven by spotlight wastewater micropollutants in low-temperature highly nitrifying activated sludge. Science of the Total Environment, 2017, 605, 291–299. DOI: 10.1016/j.scitotenv.2017.06.191
dc.relation.haspart [Publication 4]: Valitalo P., Kruglova A., Mikola A., Vahala., R. Toxicological impact of antibiotics in aquatic micro-organisms: a mini-review, International Journal of Hygiene and Environmental Health, 2016, 220, 3, 558–569. DOI: 10.1016/j.ijheh.2017.02.003
dc.relation.haspart [Publication 5]: Kruglova, A., Gonzalez-Martinez, A., Mikola A., Vahala. R. 2017. Effect of sulfadiazine and trimethoprim on activated sludge performance and microbial community dynamics in laboratory-scale MBR and SBR reactors at 8 °C – submitted to Biotechnology Progress.
dc.subject.other Civil engineering en
dc.subject.other Environmental science en
dc.title Biological removal of emerging micropollutants in nitrifying activated sludge at low temperatures en
dc.type G5 Artikkeliväitöskirja fi Insinööritieteiden korkeakoulu fi School of Engineering en
dc.contributor.department Rakennetun ympäristön laitos fi
dc.contributor.department Department of Built Environment en
dc.subject.keyword emerging micropollutants en
dc.subject.keyword wastewater treatment en
dc.subject.keyword nitrifying activated sludge en
dc.subject.keyword sludge retention time en
dc.identifier.urn URN:ISBN:978-952-60-3755-4
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Vahala, Riku, Prof., Aalto University, Department of Built Environment, Finland
dc.opn Rodriguez-Mozaz, Sara, Dr., Catalan Institute for Water Research, Spain
dc.contributor.lab Water and Environmental Engineering en
dc.rev Wilén, Britt-Marie, Prof., Chalmers University of Technology, Sweden
dc.rev Omil, Francisco, Prof., University of Santiago de Compostela, Spain 2018-06-29
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