Characterisation and removal of recalcitrants in reverse osmosis concentrates from water reclamation plants

Bagastyo, Arseto Y., Keller, Jurg, Poussade, Yvan and Batstone, Damien J. (2011) Characterisation and removal of recalcitrants in reverse osmosis concentrates from water reclamation plants. Water Research, 45 7: 2415-2427. doi:10.1016/j.watres.2011.01.024


Author Bagastyo, Arseto Y.
Keller, Jurg
Poussade, Yvan
Batstone, Damien J.
Title Characterisation and removal of recalcitrants in reverse osmosis concentrates from water reclamation plants
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2011-03
Sub-type Article (original research)
DOI 10.1016/j.watres.2011.01.024
Volume 45
Issue 7
Start page 2415
End page 2427
Total pages 13
Place of publication Lisle, IL, United States
Publisher IWA Publishing
Collection year 2012
Language eng
Formatted abstract
Water reclamation plants frequently utilise reverse osmosis (RO), generating a concentrated reject stream as a by-product. The concentrate stream contains salts, and dissolved organic compounds, which are recalcitrant to biological treatment, and may have an environmental impact due to colour and embedded nitrogen. In this study, we characterise organic compounds in RO concentrates (ROC) and treated ROC (by coagulation, adsorption, and advanced oxidation) from two full-scale plants, assessing the diversity and treatability of colour and organic compounds containing nitrogen. One of the plants was from a coastal catchment, while the other was inland. Stirred cell membrane fractionation was applied to fractionate the treated ROC, and untreated ROC along with chemical analysis (DOC, DON, COD), colour, and fluorescence excitation-emission matrix (EEM) scans to characterise changes within each fraction. In both streams, the largest fraction contained <1 kDa molecules which were small humic substances, fulvic acids and soluble microbial products (SMPs), as indicated by EEM. Under optimal treatment conditions, alum preferentially removed >10 kDa molecules, with 17-34% of organic compounds as COD. Iron coagulation affected a wider size range, with better removal of organics (41-49% as COD) at the same molar dosage. As with iron, adsorption reduced organics of a broader size range, including organic nitrogen (26-47%). Advanced oxidation (UV/H2O2) was superior for complete decolourisation and provided superior organics removal (50-55% as COD).
© 2011 Elsevier Ltd.
Keyword Reverse osmosis concentrates
Organic fractionation
Coagulation
Advanced UV/H2O2 oxidation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
Advanced Water Management Centre Publications
 
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Created: Thu, 31 Mar 2011, 09:44:59 EST by Hong Lee on behalf of Advanced Water Management Centre