Decreased UV absorbance as an indicator of micropollutant removal efficiency in wastewater treated with ozone

Ozone transforms various organic compounds that absorb light within the UV and visible spectra. UV absorbance can therefore be used to detect the transformation of chemicals during ozonation. In wastewater, decolourisation can be observed after ozonation. This study investigates the correlation of t...

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Bibliographic Details
Published in:Water science and technology 2015-01, Vol.71 (7), p.980-985
Main Authors: Wittmer, A, Heisele, A, McArdell, C S, Böhler, M, Longree, P, Siegrist, H
Format: Article
Language:English
Subjects:
Absorbance
Activated carbon
Color removal
Correlation analysis
Decoloring
Decolorization
Dissolved organic carbon
Dosage
Efficiency
Effluents
Experiments
Feedback control
Inlets (waterways)
Laboratories
Micropollutants
Organic compounds
Ozonation
Ozone
Ozone - chemistry
Ozonization
Pollutant removal
Removal
Singers
Stability
Switzerland
Ultraviolet radiation
Ultraviolet Rays
Waste Disposal, Fluid
Waste Water - analysis
Wastewater
Wastewater treatment
Wastewater treatment plants
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - chemistry
Water treatment plants
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Summary:Ozone transforms various organic compounds that absorb light within the UV and visible spectra. UV absorbance can therefore be used to detect the transformation of chemicals during ozonation. In wastewater, decolourisation can be observed after ozonation. This study investigates the correlation of the UV absorbance difference between the ozonation inlet and outlet and the removal efficiency of micropollutants in wastewater. The absorbance at 254 and 366 nm was measured at the ozonation inlet and outlet, as was the concentration of 24 representative micropollutants and the dissolved organic carbon (DOC). The results clearly showed that the relative decrease of absorbance (ΔAbs) is positively correlated with the relative removal efficiency of micropollutants. We therefore suggest that UV absorbance can be used as a feedback control parameter to achieve optimal ozone dosage in wastewater treatment plants and to gain a fast insight into the process efficiency and stability of the ozonation.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2015.053