Antibiotic Removal Mechanism in Constructed Wetland: A Review

doi:10.11924/j.issn.1000-6850.casb2022-0283

Abstract

Abstract:

With the discharge of medical wastewater and domestic sewage, antibiotics have been frequently detected in the aquatic environment and accumulated in human body through the transmission and accumulation of food chain, posing severe threat to human health. Constructed wetlands (CWs) have been used as green alternatives to conventional wastewater treatment technologies. However, to date, the mechanism of applying CWs to remove antibiotics has not been comprehensively elucidated. In order to clarify the removal behavior of antibiotics in different types of CWs, this study investigates the role of key components, including wetland substrates, microbial organisms and macrophytes, in antibiotic removal in CWs. The key mechanisms involved in antibiotic removal are summarized, including soil substrate adsorption, plant root system uptake and stem translocation, and microbial biodegradation in root system. This study also assesses the factors affecting antibiotic removal in CWs, such as the physiochemical properties of antibiotics, the types of soil substrates, enzyme type, pH, redox conditions, microbial species and activities. In addition, an in-depth discussion about the strategies for enhancing antibiotic removal in CWs ecosystem is carried out, in order to shed a light into further exploration of feasible, innovative, and efficient solutions for antibiotic removal in CWs.

Key words: antibiotic, constructed wetland, soil substrate, macrophytes, microbial community, removal mechanism, influencing factors

CHEN Gaolin, MAI Yongxin, ZHANG Dongqing, LV Mengyu, LI Xia. Antibiotic Removal Mechanism in Constructed Wetland: A Review[J]. Chinese Agricultural Science Bulletin, 2023, 39(9): 63-70.

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