The Fate of Contaminants of Emerging Concern in an Upflow Anaerobic Sludge Blanket Reactor Coupled with Constructed Wetlands for Decentralized Domestic Wastewater Treatment.

Publisher: MDPI Country of Publication: Switzerland NLM ID: 100964009 Publication Model: Electronic Cited Medium: Internet ISSN: 1420-3049 (Electronic) Linking ISSN: 14203049 NLM ISO Abbreviation: Molecules Subsets: MEDLINE

Original Publication: Basel, Switzerland : MDPI, c1995-

Wetlands* ; Water Pollutants, Chemical*/analysis ; Sewage*/chemistry ; Wastewater*/chemistry ; Bioreactors* ; Waste Disposal, Fluid*/methods ; Water Purification*/methods; Anaerobiosis

Removal of micropollutants using biological treatment systems remains a challenge, since conventional bioprocess systems require adaptations to provide more advanced treatment. An ambient temperature upflow anaerobic sludge blanket (UASB) reactor was employed, followed by a two-stage (saturated and unsaturated) vertical subsurface flow (VSSF) constructed wetland (CW) system, to treat domestic wastewater from a nearby settlement and investigate the occurrence and fate of 10 contaminants of emerging concern (CECs) in decentralized, non-conventional treatment systems. The integrated UASB-two-stage CW system achieved high performance regarding abatement of target CECs across all periods. Removal efficiencies ranged from 78% ± 21% (ketoprofen) to practically 100% (2-hydroxybenzothiazole). The pilot system was found to be robust performance-wise and provided enhanced treatment in comparison to a conventional wastewater treatment plant operating in parallel. Most of the target CECs were successfully treated by UASB, saturated and unsaturated CWs, while ibuprofen, bisphenol A and diclofenac were mostly removed in the unsaturated CW. Environmental risk assessment revealed that triclosan poses a significant ecological risk to algae during treated wastewater disposal into the aquatic environment. Additionally, cumulative risk quotient indicated that the potential for mixture toxicity should be carefully considered across all trophic levels.

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101112731 European Union

Keywords: benzothiazoles; benzotriazoles; biodegradation; constructed wetlands; decentralized treatment; endocrine disrupting chemicals; non-steroidal anti-inflammatory drugs; pilot scale; sorption; upflow anaerobic sludge blanket reactor

0 (Water Pollutants, Chemical)
0 (Sewage)
0 (Wastewater)

Date Created: 20250712 Date Completed: 20250712 Latest Revision: 20250714

20250715

PMC12251067

10.3390/molecules30132671

40649190