TY - JOUR
T1 - Differences in bacterial N, P, and COD removal in pilot-scale constructed wetlands with varying flow types
AU - Zeng, Luping
AU - Tao, Ran
AU - Tam, Nora Fung yee
AU - Huang, Wenda
AU - Zhang, Longzhen
AU - Man, Ying
AU - Xu, Xiaomin
AU - Dai, Yunv
AU - Yang, Yang
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/12
Y1 - 2020/12
N2 - The mechanisms of bacterial nitrogen (N), phosphorus (P), and chemical oxygen demand (COD) removal in pilot-scale constructed wetlands (CWs) were investigated in the present work. Three types of CWs were assessed: vertical flow (VF), horizontal flow (HF), and surface flow (SF), each with three planting conditions, with either Thalia, Canna or without plants. The results show that construction types affected microbes more than planting conditions. VF CWs promoted the aerobic processing of total N, total P, COD, and NH3-N, increasing the respective removal efficiencies by 4–19%, 13–32%, 19–29%, and 75–80%, respectively, compared with SF CWs. The relative abundance of nitrifying, denitrifying, methanotrophic and dephosphorized bacteria, and functional genes such as nxrA, nirK, nosZ, mmoX, and phoD were higher in VF CWs. Positive and simple gene networks in VF CWs can effectively reduce the redundancy in functional genes, enhance bacterial function and gene interactions, thus promoting nutrient removal.
AB - The mechanisms of bacterial nitrogen (N), phosphorus (P), and chemical oxygen demand (COD) removal in pilot-scale constructed wetlands (CWs) were investigated in the present work. Three types of CWs were assessed: vertical flow (VF), horizontal flow (HF), and surface flow (SF), each with three planting conditions, with either Thalia, Canna or without plants. The results show that construction types affected microbes more than planting conditions. VF CWs promoted the aerobic processing of total N, total P, COD, and NH3-N, increasing the respective removal efficiencies by 4–19%, 13–32%, 19–29%, and 75–80%, respectively, compared with SF CWs. The relative abundance of nitrifying, denitrifying, methanotrophic and dephosphorized bacteria, and functional genes such as nxrA, nirK, nosZ, mmoX, and phoD were higher in VF CWs. Positive and simple gene networks in VF CWs can effectively reduce the redundancy in functional genes, enhance bacterial function and gene interactions, thus promoting nutrient removal.
KW - Constructed wetland
KW - Functional bacteria and genes
KW - Methane metabolism
KW - Network complexity
KW - Nitrogen and phosphorus removal
UR - http://www.scopus.com/inward/record.url?scp=85090404254&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2020.124061
DO - 10.1016/j.biortech.2020.124061
M3 - Article
C2 - 32905947
AN - SCOPUS:85090404254
SN - 0960-8524
VL - 318
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 124061
ER -