TY - JOUR
T1 - Nitrogen removal from dewatering liquid of landfill sludge by partial nitrification and denitrification
AU - Ma, Zihang
AU - Lin, Lifeng
AU - Xi, Jiafu
AU - Gong, Xiaolu
AU - Wang, Jianqiao
AU - Peng, Peng
AU - An, Ying
AU - Hu, Weijie
AU - Cao, Jing
AU - Wu, Zhichao
AU - Zhou, Zhen
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/12
Y1 - 2023/12
N2 - Two pilot-scale two-stage anoxic/oxic membrane bioreactors were operated at different dissolved oxygen (DO) levels to evaluate nitrogen removal performances for treating landfill sludge dewatering liquid. Under either high (5.0–6.0 mg/L) or conventional DO (2.0–3.0 mg/L) conditions, partial nitrification (PN)-denitrification was both achieved, and high-concentration free ammonia (FA) ensured stable PN. The high DO system exhibited higher nitrite accumulation (98.5 %) and nitrogen removal (98.0 %), and its nitrogen removal was mainly ascribed to PN-denitrification (53.8 %). Kinetic inhibition tests and microbial sequencing results demonstrated that high DO condition improved the abundance and ability of ammonia-oxidizing bacteria (AOB) rather than nitrite-oxidizing bacteria under the FA inhibition. Pseudomonas, Thauera, and Soehngenia were characteristic genus in the high DO system, and Nitrosomonas was only AOB. Metagenomic analysis confirmed the important role of PN on nitrogen removal in high DO system. This provides valuable references for the efficient and economic treatment of ammonia-rich wastewater.
AB - Two pilot-scale two-stage anoxic/oxic membrane bioreactors were operated at different dissolved oxygen (DO) levels to evaluate nitrogen removal performances for treating landfill sludge dewatering liquid. Under either high (5.0–6.0 mg/L) or conventional DO (2.0–3.0 mg/L) conditions, partial nitrification (PN)-denitrification was both achieved, and high-concentration free ammonia (FA) ensured stable PN. The high DO system exhibited higher nitrite accumulation (98.5 %) and nitrogen removal (98.0 %), and its nitrogen removal was mainly ascribed to PN-denitrification (53.8 %). Kinetic inhibition tests and microbial sequencing results demonstrated that high DO condition improved the abundance and ability of ammonia-oxidizing bacteria (AOB) rather than nitrite-oxidizing bacteria under the FA inhibition. Pseudomonas, Thauera, and Soehngenia were characteristic genus in the high DO system, and Nitrosomonas was only AOB. Metagenomic analysis confirmed the important role of PN on nitrogen removal in high DO system. This provides valuable references for the efficient and economic treatment of ammonia-rich wastewater.
KW - Dissolved oxygen
KW - Free ammonia
KW - Landfill sludge dewatering liquid
KW - Partial nitrification and denitrification
KW - Two-stage anoxic/oxic membrane bioreactor
UR - https://www.scopus.com/pages/publications/85173655321
U2 - 10.1016/j.biortech.2023.129856
DO - 10.1016/j.biortech.2023.129856
M3 - 文章
C2 - 37820966
AN - SCOPUS:85173655321
SN - 0960-8524
VL - 390
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 129856
ER -
