Green solutions for antibiotic pollution: Assessing the phytoremediation potential of aquatic macrophytes in wastewater treatment plants

• Published in: Environmental pollution (1987) 2024-09, Vol.357, p.124376, Article 124376
• Main Authors: Marques, Raizza Zorman, Oliveira, Pedro Gabriel Diniz, Barbato, Marcello Locatelli, Kitamura, Rafael Shinji Akiyama, Maranho, Leila Teresinha, Brito, Julio Cesar Moreira, Nogueira, Keite da Silva, Juneau, Philippe, Gomes, Marcelo Pedrosa
• Format: Article
• Language: English
• Subjects: Antibiotics; Macrophytes; Phytoremediation; Removal efficiency; Treated wastewater
• ISSN: 0269-7491; 1873-6424; 1873-6424
• DOI: 10.1016/j.envpol.2024.124376

We compared the ability of one emergent (Sagittaria montevidensis), two floating (Salvinia minima and Lemna gibba), and one heterophyllous species (Myriophyllum aquaticum) to simultaneously remove sulfamethoxazole, sulfadiazine, ciprofloxacin, enrofloxacin, norfloxacin, levofloxacin, oxytetracycline, tetracycline, doxycycline, azithromycin, amoxicillin, and meropenem from wastewater in a mesocosm-scale constructed wetland over 28 days. Antibiotic concentrations in plants and effluent were analyzed using an LC-MS/MS to assess the removal rates and phytoremediation capacities. M. aquaticum did not effectively mitigate contamination due to poor tolerance and survival in effluent conditions. S. minima and L. gibba demonstrated superior efficiency, reducing the antibiotic concentrations to undetectable levels within 14 days, while S. montevidensis achieved this result by day 28. Floating macrophytes emerge as the preferable choice for remediation of antibiotics compared to emergent and heterophyllous species. Antibiotics were detected in plant tissues at concentrations ranging from 0.32 to 29.32 ng g−1 fresh weight, highlighting macrophytes' ability to uptake and accumulate these contaminants. Conversely, non-planted systems exhibited a maximum removal rate of 65%, underscoring the persistence of these molecules in natural environments, even after the entire experimental period. Additionally, macrophytes improved effluent quality regardless of species by reducing total soluble solids and phosphate concentrations and mitigating ecotoxicological effects. This study underscores the potential of using macrophytes in wastewater treatment plants to enhance overall efficiency and prevent environmental contamination by antibiotics, thereby mitigating the harmful impact on biota and antibiotic resistance. Selecting appropriate plant species is crucial for successful phytoremediation in constructed wetlands, and actual implementation is essential to validate their effectiveness and practical applicability. [Display omitted] •Macrophytes exposed to real multi-contaminated WWTP effluent.•Varied phytoremediation capacity observed among morphotypes.•Floating macrophytes outperform emergent and heterophyllous.•Macrophytes enhance WWTP efficiency in antibiotic reduction.•Lab studies need validation under natural conditions for phytoremediation.