TY - JOUR
T1 - Enhanced performance of pilot-scale hybrid constructed wetlands with A/O reactor in raw domestic sewage treatment
AU - Xiong, Chunhui
AU - Tam, Nora Fungyee
AU - Dai, Yunv
AU - Zhang, Xiaomeng
AU - Li, Rui
AU - Zheng, Yu
AU - Wang, Lin
AU - Yang, Yang
N1 - Publisher Copyright:
© 2019
PY - 2020/3/15
Y1 - 2020/3/15
N2 - The aim of this study was to improve the nutrient removal efficiency by optimizing aeration time, hydraulic loading rate (HLR) and combination type in hybrid constructed wetlands (HCWs) with anoxic/oxic (A/O) reactor. The results showed that, the highest removal percentages of TN, NH4–N, TP, PO4–P and COD were 87.9%, 98.1%, 86.1%, 85.3% and 95.2%, respectively, in horizontal subsurface flow (HF) – surface flow – vertical subsurface flow CW with A/O reactor at 0.1 m/d HLR and 2 h aeration. HLR, aeration time and combination type had a significant impact on the removal of nutrients, though plant diversity did not have any significant influence. Presence of the A/O reactor improved the removal of TN in the HCWs by reducing influent loading and changing influent characteristics, thereby affecting the role of nitrification, anammox, and denitrification processes. The anammox process was the dominant pathway in the 1st HF CWs during the aeration period, where the highest removal of phosphorus was observed.
AB - The aim of this study was to improve the nutrient removal efficiency by optimizing aeration time, hydraulic loading rate (HLR) and combination type in hybrid constructed wetlands (HCWs) with anoxic/oxic (A/O) reactor. The results showed that, the highest removal percentages of TN, NH4–N, TP, PO4–P and COD were 87.9%, 98.1%, 86.1%, 85.3% and 95.2%, respectively, in horizontal subsurface flow (HF) – surface flow – vertical subsurface flow CW with A/O reactor at 0.1 m/d HLR and 2 h aeration. HLR, aeration time and combination type had a significant impact on the removal of nutrients, though plant diversity did not have any significant influence. Presence of the A/O reactor improved the removal of TN in the HCWs by reducing influent loading and changing influent characteristics, thereby affecting the role of nitrification, anammox, and denitrification processes. The anammox process was the dominant pathway in the 1st HF CWs during the aeration period, where the highest removal of phosphorus was observed.
KW - A/O reactor
KW - Anammox
KW - Constructed wetland
KW - Functional gene
KW - Nutrient removal
KW - Orthogonal test
UR - http://www.scopus.com/inward/record.url?scp=85077390285&partnerID=8YFLogxK
U2 - 10.1016/j.jenvman.2019.110026
DO - 10.1016/j.jenvman.2019.110026
M3 - Article
C2 - 31929064
AN - SCOPUS:85077390285
SN - 0301-4797
VL - 258
JO - Journal of Environmental Management
JF - Journal of Environmental Management
M1 - 110026
ER -