Effects of salinity on pollutant removal and bacterial community in a partially saturated vertical flow constructed wetland

被引：35
|
作者：
Gao, Feng [1 ]
Liu, Guochen [1 ]
She, Zonglian [1 ,2 ]
Ji, Junyuan [1 ,2 ]
Gao, Mengchun [1 ,2 ]
Zhao, Yangguo [1 ,2 ]
Guo, Liang [1 ,2 ]
Jin, Chunji [1 ,2 ]
机构：
[1] Ocean Univ China, Key Lab Marine Environm & Ecol, Minist Educ, Qingdao 266100, Peoples R China
[2] Ocean Univ China, Coll Environm Sci & Engn, Qingdao 266100, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2021年 / 329卷
基金：
中国国家自然科学基金;
关键词：
Saline wastewater; Nitrogen removal; Microbial community; Unsaturated zone; Saturated zone;
D O I：
10.1016/j.biortech.2021.124890
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
This study investigated the influence of salinity on pollutant removal and bacterial community within a partially saturated vertical flow constructed wetland (PS-VFCW). High removal rates of NH4+-N (88.29 ? 4.97?100 ? 0%), total inorganic nitrogen (TIN) (50.00 ? 7.21?62.81 ? 7.21%) and COD (91.08 ? 2.66?100 ? 0%) were achieved at 0.4?2.4% salinity levels. The removal of ammonia, TIN and organic matter occurred mainly in unsaturated zone. Salt-adaptable microbes became the dominant bacteria with salinity elevated. The proportion of ammoniaoxidizing bacteria (AOB) in the 0?5 cm depth layer (unsaturated zone) decreased obviously as the salinity increased to 2.4%. Nitrite-oxidizing bacteria (NOB) in the 0?5 cm depth layer showed a decreasing trend with elevated salinity. Denitrifying bacteria (DNB) in the 0?5 cm depth layer maintained high abundance (27.70?53.60%) at 0.4?2.4% salinity levels. At 2.4% salinity, AOB, NOB and DNB were observed in the unsaturated zones and saturated zones, and showed higher abundance in the unsaturated zone.
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页数：12
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