Fate of trace organic contaminants in oxic-settling-anoxic (OSA) process applied for biosolids reduction during wastewater treatment

Authors

Galilee U. Semblante, University of Wollongong
Faisal I. Hai, University of WollongongFollow
James A. McDonald, University of New South WalesFollow
Stuart J. Khan, University of New South WalesFollow
Mark Nelson, University of WollongongFollow
Duu-Jong Lee, National Taiwan UniversityFollow
William E. Price, University of WollongongFollow
Long D. Nghiem, University of WollongongFollow

RIS ID

121444

Publication Details

Semblante, G. U., Hai, F. I., McDonald, J., Khan, S. J., Nelson, M., Lee, D., Price, W. E. & Nghiem, L. D. (2017). Fate of trace organic contaminants in oxic-settling-anoxic (OSA) process applied for biosolids reduction during wastewater treatment. Bioresource Technology, 240 181-191.

Abstract

This study investigated the fate of trace organic contaminants (TrOCs) in an oxic-settling-anoxic (OSA) process consisting of a sequencing batch reactor (SBR) with external aerobic/anoxic and anoxic reactors. OSA did not negatively affect TrOC removal of the SBR. Generally, low TrOC removal was observed under anoxic and low substrate conditions, implicating the role of co-metabolism in TrOC biodegradation. Several TrOCs that were recalcitrant in the SBR (e.g., benzotriazole) were biodegraded in the external aerobic/anoxic reactor. Some hydrophobic TrOCs (e.g., triclosan) were desorbed in the anoxic reactor possibly due to loss of sorption sites through volatile solids destruction. In OSA, the sludge was discharged from the aerobic/anoxic reactor which contained lower concentration of TrOCs (e.g., triclosan and triclocarban) than that of the control aerobic digester, suggesting that OSA can also help to reduce TrOC concentration in residual biosolids.