Assessing the potential of a UV-based AOP for treating high-salinity municipal wastewater reverse osmosis concentrate

Umar, M, Roddick, F and Fan, L 2013, 'Assessing the potential of a UV-based AOP for treating high-salinity municipal wastewater reverse osmosis concentrate', Water Science & Technology, vol. 68, no. 9, pp. 1994-1999.


Document type: Journal Article
Collection: Journal Articles

Title Assessing the potential of a UV-based AOP for treating high-salinity municipal wastewater reverse osmosis concentrate
Author(s) Umar, M
Roddick, F
Fan, L
Year 2013
Journal name Water Science & Technology
Volume number 68
Issue number 9
Start page 1994
End page 1999
Total pages 6
Publisher IWA Publishing
Abstract The UVC/H2 O2 process was studied at laboratory scale for the treatment of one moderate (conductivity ∼8 mS/cm) and two high salinity (∼23 mS/cm) municipal wastewater reverse osmosis concentrate (ROC) samples with varying organic and inorganic characteristics. The process efficiency was characterized in terms of reduction of dissolved organic carbon (DOC), chemical oxygen demand (COD), colour and absorbance at 254 nm (A254), and the improvement of biodegradability. The reduction of colour and A254 was significantly greater than for DOC and COD for all samples due to the greater breakdown of humic compounds, as confirmed by fluorescence excitation-emission matrix spectra. Fairly small differences in the reduction of DOC (26–38%) and COD (25–37%) were observed for all samples, suggesting that the salinity of the ROC did not have a significant impact on the UVC/H2 O2 treatment under the test conditions. The biodegradability of the treated ROC samples improved markedly (approximately 2-fold) after 60 min UVC/H2 O2 treatment. This study indicates the potential of UVC/H2 O2 treatment followed by biological processes for treating high-salinity concentrate, and the robustness of the process where the characteristics of the secondary effluent (influent to RO) and thus resultant ROC vary significantly.
Subject Wastewater Treatment Processes
Membrane and Separation Technologies
Keyword(s) Biodegradability
COD
DOC
reverse osmosis concentrate
salinity
UVC/H2O2
DOI - identifier 10.2166/wst.2013.417
Copyright notice © 2013 IWA Publishing
ISSN 0273-1223
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