TY - JOUR
T1 - Performance and microbial community of MBBRs under three maintenance strategies for intermittent stormwater treatment
AU - An, Ying
AU - Xing, Yunxin
AU - Wei, Jun
AU - Zhou, Chuanting
AU - Wang, Libing
AU - Pan, Xiaowen
AU - Wang, Jianguang
AU - Wang, Mengyu
AU - Pang, Hongjian
AU - Zhou, Zhen
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/12/10
Y1 - 2022/12/10
N2 - Maintaining microbial activities is a critical problem for biological treatment processes of stormwater runoff because of its intermittent nature. In this study, the suitability of the moving bed biofilm reactor (MBBR) was assessed for stormwater treatment by long-term dry - rainy alternation operation. Three strategies to maintain microbial activities during the dry period, including keeping idle (MBBRI), introducing river water throughout the period (MBBRC), and ahead of a rainy day (MBBRM), were investigated. COD and NH4+-N removal efficiencies declined linearly from 94.2 % and 94.7 % to 51.7 % and 64.6 %, respectively, after the 61-day operation with microbial activity and biomass decreased. Introducing river water adversely affected the process performance as MBBRC presented the highest declining rates of COD and NH4+-N removal efficiencies. Most genera in MBBRs decayed and their microbial communities developed towards individualization, especially in MBBRM because of its highest environmental variability. Keeping idle slightly alleviated the performance decline and formed a more stable microbial community structure. However, significantly deteriorating performance in all MBBRs after the long-term operation indicated that MBBRs were unsuitable for treating stormwater independently of intermittent nature.
AB - Maintaining microbial activities is a critical problem for biological treatment processes of stormwater runoff because of its intermittent nature. In this study, the suitability of the moving bed biofilm reactor (MBBR) was assessed for stormwater treatment by long-term dry - rainy alternation operation. Three strategies to maintain microbial activities during the dry period, including keeping idle (MBBRI), introducing river water throughout the period (MBBRC), and ahead of a rainy day (MBBRM), were investigated. COD and NH4+-N removal efficiencies declined linearly from 94.2 % and 94.7 % to 51.7 % and 64.6 %, respectively, after the 61-day operation with microbial activity and biomass decreased. Introducing river water adversely affected the process performance as MBBRC presented the highest declining rates of COD and NH4+-N removal efficiencies. Most genera in MBBRs decayed and their microbial communities developed towards individualization, especially in MBBRM because of its highest environmental variability. Keeping idle slightly alleviated the performance decline and formed a more stable microbial community structure. However, significantly deteriorating performance in all MBBRs after the long-term operation indicated that MBBRs were unsuitable for treating stormwater independently of intermittent nature.
KW - Maintenance strategy
KW - Microbial community
KW - Moving bed bioreactor (MBBR)
KW - Stormwater treatment
UR - https://www.scopus.com/pages/publications/85140137103
U2 - 10.1016/j.scitotenv.2022.158578
DO - 10.1016/j.scitotenv.2022.158578
M3 - 文章
C2 - 36075438
AN - SCOPUS:85140137103
SN - 0048-9697
VL - 851
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 158578
ER -