期刊
ACS OMEGA
卷 6, 期 4, 页码 2865-2872出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c05202
关键词
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资金
- National Natural Science Foundation of China [51908326]
- Science Foundation of Shandong Jianzhu University [X18047ZX]
- Science Foundation of Qingdao University of Science and Technology [1203043003575]
This study found that adding activated carbon and biochar to surface flow constructed wetlands can significantly improve the removal efficiency of benzofluoranthrene (BbFA) and nitrate nitrogen, reduce the absorption of PAHs by plants, and enhance microbial degradation.
Polycyclic aromatic hydrocarbons (PAHs), as hazardous pollutants, could be removed by constructed wetlands (CWs). While the traditional substrate of CWs has a weak adsorption capacity for PAHs, in this study, the carbonous fillers-activated carbon (AC) and biochar-were added into the substrate of surface flow CWs to improve the removal performance of benzofluoranthrene (BbFA), a typical PAH. The results showed that the BbFA removal efficiencies in CWs with the addition of AC and biochar were 11.8 and 1.2% higher than those in the Control group, respectively. Simultaneously, the removal efficiencies of NO3--N were 42.8 and 68.4% in these two CWs, while the BbFA content in the substrate and plants with the addition of carbon was lower than that in the Control group. The addition of carbonous filler reduced the absorption of PAHs by plants in CWs and enhanced microbial degradation. The microbial community results showed that the relative abundance of Proteobacteria, especially gamma-proteobacteria, was higher with the addition of fillers, which related to PAH degradation.
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