Nitrogen removal by the enhanced floating treatment wetlands from the secondary effluent.
Three novel floating treatment wetlands, including autotrophic enhanced floating treatment wetland (AEFTW), heterotrophic enhanced floating treatment wetland (HEFTW) and enhanced floating treatment wetland (EFTW) were developed to remove nitrogen from the secondary effluent. Results showed that the analogously excellent nitrogen removal performance was achieved in AEFTW and HEFTW. About 89.4% of the total nitrogen (TN) was removed from AEFTW at a low S/N of 0.9 and 88.5% from HEFTW at a low C/N of 3.5 when the hydraulic retention time (HRT) was 1d in summer. Higher nitrification and denitrification performance were achieved in AEFTW. Addition of electron donors effectively reduced the N2O emission, especially in summer and autumn. High-throughput sequencing analysis revealed that the electron donors distinctly induced the microbial shifts. Dechloromonas, Thiobacillus and Nitrospira became the most predominant genus in HEFTW, AEFTW and EFTW. And autotrophic and heterotrophic denitrification could simultaneously occur in HEFTW and AEFTW.
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
Lei
L
Gao
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
Weili
W
Zhou
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
Jungchen
J
Huang
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China. Electronic address: heshengbing@sjtu.edu.cn.
Shengbing
S
He
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
Yijia
Y
Yan
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
Wenying
W
Zhu
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
Suqing
S
Wu
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
Xu
X
Zhang
D052818:Autotrophic Processes; D058440:Denitrification; D009584:Nitrogen; D018508:Water Purification; D053833:Wetlands
D009584:Nitrogen
Autotrophic and heterotrophic denitrification; Enhanced floating treatment wetland; Microbial community; N(2)O emission; Secondary effluent