Abstract
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 ammonia-oxidizing 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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