Phytoremediation of pharmaceutical-contaminated wastewater: Insights into rhizobacterial dynamics related to pollutant degradation mechanisms during plant life cycle

Yifei Li, Jie Lian, Bing Wu, Hua Zou, Soon Keat Tan

Rannsóknarafurð: Framlag til fræðitímaritsGreinritrýni

7 Tilvitnanir (Scopus)

Útdráttur

Rhizobacterial dynamics, relating to pollutant degradation mechanisms, over the course of plant lifespan have rarely been reported when using phytoremediation technologies for pharmaceutical-contaminated wastewater treatment. This study investigated the rhizobacterial dynamics of Typha angustifolia in constructed wetlands to treat ibuprofen (IBP)-polluted wastewater throughout plant development from seedling, vegetative, bolting, mature, to senescent stages. It was found that conventional pollutant and IBP removals increased with plant development, reaching to the best performance at bolting or mature stage (removal efficiencies: 92% organics, 52% ammonia, 60% phosphorus and 76% IBP). In the IBP-stressed wetlands, the rhizobacterial diversity during plant development was adversely affected by IBP accompanied with a reduced evenness. The bacterial communities changed dynamically at different developmental stages and showed significant differences compared to the control wetlands (free of IBP). The dominant bacteria colonized in the rhizosphere was the phylum Actinobacteria, having a final relative abundance of 0.79 and containing a large amount of genus norank_o__PeM15. Positive interactions were evident among the rhizobacteria in IBP-stressed wetlands and the predicted functions of 16S rRNA genes revealed the potential co-metabolism and metabolism of IBP. The co-metabolism of IBP might be related to root exudates such as amino acid, lipid, fatty acid and organic acid. In addition, positive correlations between the organic compounds of interstitial water (bulk environment) and the rhizobacterial communities were observed in IBP-stressed wetlands, which suggests that the influence of IBP on bulk microbiome might be able to modulate rhizosphere microbiome to achieve the degradation of IBP via co-metabolism or metabolism.

Upprunalegt tungumálEnska
Númer greinar126681
FræðitímaritChemosphere
Bindi253
DOI
ÚtgáfustaðaÚtgefið - ágú. 2020

Athugasemd

Funding Information:
This study was financially funded by Natural Science Foundation of Jiangsu Province , China (No. BK20180632 ) and Innovative and Entrepreneurial Foundation of Jiangsu Province , China (No. 1126010241180210 ) (supported by the Government of Jiangsu Province ). The authors gratefully acknowledge the assistance and support from Nanyang Technological University , Singapore.

Publisher Copyright:
© 2020 Elsevier Ltd

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