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Ozone Treatment Targeting Pharmaceutical Residues: Validation and Process Control in a Wastewater Treatment Plant
Linköping University, Department of Physics, Chemistry and Biology, Biotechnology.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Major studies conducted in Europe and North America has concluded that the current processes in wastewater treatment plants insufficiently degrade micropollutants e.g. pharmaceutical residues. Several sorption and oxidation methods has therefore been investigated with the purpose of removing or degrading micropollutants in wastewater. The main purpose of this project was, firstly, to validate the results from a pilot study conducted by Tekniska verken i Linköping AB (2014) which investigated the use of ozone to degrade pharmaceutical residues. Secondly, to investigate and design a suitable process control strategy for the ozonation process. Four different tests were conducted during the project, a dose-response test, step-response tests, a trace test, and a performance test. A poorer average reduction of pharmaceutical residues was observed in this project compared to the pilot study. An average reduction of approximately 80% was observed at the highest tested dose, 0.67 mg O3/mg DOC, N corr. Whilst an average reduction of 90% was observed at approximately 0.46 mg O3/mg DOC, N corr, in the pilot study. However, the quality of the wastewater was worse during this project compared to the pilot study. ΔUVA254 and offgas concentration of ozone were found to be suitable control parameters for process control. A control strategy based on a combination of these parameters was designed, where ΔUVA254 was used as the main control parameter and the off-gas concentration of ozone was used as a limiting controller to ensure a sufficient mass transfer in the system. In conclusion, a suitable flow proportional base ozone dose valid for current water conditions has been identified, 10 mg/L. Differences in wastewater quality which heavily influence the ozonation process have been identified. Lastly, a control strategy for process control of the ozonation have been identified, designed and is ready for implementation.

Place, publisher, year, edition, pages
2018. , p. 64
Keywords [en]
Ozone, Ozone treatment, Wastewater, Process control, Pharmaceutical residues, Wastewater treatment plant, Validation, Modelling
National Category
Industrial Biotechnology
Identifiers
URN: urn:nbn:se:liu:diva-154012ISRN: LITH-IFM-A-EX--18/3589--SEOAI: oai:DiVA.org:liu-154012DiVA, id: diva2:1281630
External cooperation
Tekniska verken i Linköping AB
Subject / course
Biotechnology
Presentation
2019-01-14, Röntgen, Linköpings universitet, Linköping, 15:30 (Swedish)
Supervisors
Examiners
Available from: 2019-01-23 Created: 2019-01-22 Last updated: 2019-01-23Bibliographically approved

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CiteExportLink to record
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