TY - JOUR
T1 - Influence of critical factors on nitrogen removal contribution by anammox and denitrification in an anammox-inoculated wastewater treatment system
AU - Wang, Limei
AU - Hong, Yiguo
AU - Gu, Ji Dong
AU - Wu, Jiapeng
AU - Yan, Jia
AU - Lin, Jih Gaw
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/4
Y1 - 2021/4
N2 - Suitable environmental conditions facilitate the nitrogen removal in the wastewater treatment system. However, it remains unknown about how critical environmental factors regulating the activity of denitrification and anammox in the anammox-inoculated wastewater treatment system. In this study, the effect of temperature, pH, dissolved oxygen, organic matter, and substrates on denitrification and anammox activity was investigated with the nitrogen isotope pairing method. Results showed that the increase of temperature promoted the activities of both denitrification and anammox, and the activity of anammox was higher than that of denitrification at 25°C–30°C. Denitrification was more sensitive to acidic and alkaline pH values with the highest activity observed at neutral pH, but anammox has a more robust adaptability and the reaction rate remained relatively higher over a wider pH range. Moreover, anammox showed a stronger tolerance than denitrification to higher dissolved oxygen (DO) concentration. In addition, organic matter promoted the activity of denitrification significantly, while the anammox activity was inhibited by glucose, but enhanced by acetate, sodium formate and pyruvate. The denitrification and anammox reaction rates responding to nitrate were fitted well to Michaelis-Menten kinetics, but showing a linear relationship with nitrite. The results presented here offered useful information on how to regulate the environmental factors to improve the nitrogen removal efficiency from wastewater by facilitating the collaboration between denitrification and anammox.
AB - Suitable environmental conditions facilitate the nitrogen removal in the wastewater treatment system. However, it remains unknown about how critical environmental factors regulating the activity of denitrification and anammox in the anammox-inoculated wastewater treatment system. In this study, the effect of temperature, pH, dissolved oxygen, organic matter, and substrates on denitrification and anammox activity was investigated with the nitrogen isotope pairing method. Results showed that the increase of temperature promoted the activities of both denitrification and anammox, and the activity of anammox was higher than that of denitrification at 25°C–30°C. Denitrification was more sensitive to acidic and alkaline pH values with the highest activity observed at neutral pH, but anammox has a more robust adaptability and the reaction rate remained relatively higher over a wider pH range. Moreover, anammox showed a stronger tolerance than denitrification to higher dissolved oxygen (DO) concentration. In addition, organic matter promoted the activity of denitrification significantly, while the anammox activity was inhibited by glucose, but enhanced by acetate, sodium formate and pyruvate. The denitrification and anammox reaction rates responding to nitrate were fitted well to Michaelis-Menten kinetics, but showing a linear relationship with nitrite. The results presented here offered useful information on how to regulate the environmental factors to improve the nitrogen removal efficiency from wastewater by facilitating the collaboration between denitrification and anammox.
KW - Anammox
KW - Denitrification
KW - Environmental factors
KW - Nitrogen remove
KW - Wastewater treatment system
UR - http://www.scopus.com/inward/record.url?scp=85097910393&partnerID=8YFLogxK
U2 - 10.1016/j.jwpe.2020.101868
DO - 10.1016/j.jwpe.2020.101868
M3 - 文章
AN - SCOPUS:85097910393
SN - 2214-7144
VL - 40
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
M1 - 101868
ER -