期刊
BIORESOURCE TECHNOLOGY
卷 311, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123481
关键词
Constructed wetland; Benzofluoranthene; Removal pathway; Activated carbon; Biochar
资金
- National Natural Science Foundation of China [51908326, 51720105013]
- China Postdoctoral Science Foundation [2018M640632]
- Major Innovation Project of Shandong Province [2019JZZY010411]
The limited adsorption capacity of the substrate and the concentration of dissolved oxygen in constructed wetlands (CWs) have inhibited their ability to efficiently remove polycyclic aromatic hydrocarbons (PAHs) from wastewater. Presently, biochar and activated carbon modified with Fe3+ and Mn4+ were used as effective sorbents in the removal of benzofluoranthene (BbFA), a typical PAH, in CW microcosms. The addition of metallic ions embedded carbon increased NO3-N accumulation by the reduction of Fe3+ and Mn4+, which led to improved BbFA degradation. Additionally, plant adsorption in root and stem sections were observed separately. The abundance of PAH-degrading microbes in the rhizosphere substrate was higher with the metallic ions embedded carbon than control group. The Fe3+, Mn4+ and NO3-N served as electron acceptors increased BbFA microbial degradation. The removal pathways of BbFA in the modified CWs were proposed which involved settlement in the substrate, plant absorption, and microbial degradation.
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