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Stereoselective degradation pathway of amide chiral herbicides and its impacts on plant and bacterial communities in integrated vertical flow constructed wetlands

[Display omitted] •The degradation efficiency of napropamide is higher than that of metolachlor.•Enantioselective degradation more notable under aerobic conditions.•Plant fluorescence performance is an indicator of wetland biodegradation recovery.•Herbicide, plants, wetland hydraulics jointly influe...

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Bibliographic Details
Published in:Bioresource technology 2022-05, Vol.351, p.126997-126997, Article 126997
Main Authors: Zheng, Yucong, Zhang, Dongxian, Sun, Zhuanzhuan, Yang, Qian, Liu, Ying, Cao, Ting, Chen, Rong, Dzakpasu, Mawuli, Wang, Xiaochang C.
Format: Article
Language:English
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Summary:[Display omitted] •The degradation efficiency of napropamide is higher than that of metolachlor.•Enantioselective degradation more notable under aerobic conditions.•Plant fluorescence performance is an indicator of wetland biodegradation recovery.•Herbicide, plants, wetland hydraulics jointly influence microbial community structure. This study demonstrates the stereoselective degradation patterns and biodegradation mechanisms of metolachlor (MET) and napropamide (NAP) in integrated vertical flow constructed wetlands (IVCW). The higher interphase transferability of NAP resulted in higher degradation rates of 90.60 ± 4.09%. The enantiomeric fraction (EF) values of 0.38 ± 0.02 and 0.54 ± 0.03, respectively, recorded for the enantiomers S-MET and R-NAP, with higher herbicidal activities, demonstrated their highly selective biodegradation patterns. The antioxidant enzyme activities and fluorescence parameters of plants showed positive correlations with the degradation efficiency and enantioselectivity of MET and NAP. Adaptive regulations by plants promoted the proliferation of microbial genera like Enterobacter and unclassified_Burkholderiales, which could facilitate plant growth. Moreover, enrichment of the herbicide-degrading functional bacteria Terrimonas (5.10%), Comamonas (4.05%) Pseudoxanthomonas (4.49%) and Mycobacterium (1.42%) demonstrably promoted the preferential degradation of S-MET and R-NAP. Furthermore, the abundance of Ferruginibacter favored the use of R-NAP as carbon source to achieve co-removal of R-NAP and NO3–-N.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2022.126997