TY - JOUR
T1 - Process stability and the recovery control associated with inhibition factors in a UASB-anammox reactor with a long-term operation
AU - Niu, Qigui
AU - He, Shilong
AU - Zhang, Yanlong
AU - Ma, Haiyuan
AU - Liu, Yuan
AU - Li, Yu You
N1 - Funding Information:
This work was supported by JSPS ( Japan Society for the Promotion of Science ) KAKENHI Grant-in-Aid for JSPS Fellowes ( 26.04044 ). The first author gratefully acknowledges support through the Japan Society for the Promotion of Science (JSPS) as postdoctoral support.
Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016/3/1
Y1 - 2016/3/1
N2 - A UASB-anammox reactor was operated for 900days to study its process stability. The negative effects of free ammonia (FA) and free nitrous acid (FNA) were investigated over three separate inhibitions and recoveries. The IC10, IC50 and IC90 (inhibitory concentration/a 10%, 50% and 90% activity loss) of FNA and FA responding to the NH4+-N, NO2--N and TN removal efficiency were evaluated. In the 1st inhibition, the average FNA-IC10 observed was 0.67μgL-1 and the FA-IC10 for TN removal was 4.85mgL-1. In the 2nd inhibition, an FNA-IC10 of 0.44μgL-1 and an FA-IC10 of 3.56 were found. In the 3rd inhibition, however, both the FNA-IC10 and FA-IC10 were found to have increased, with values of 0.50μgL-1 and 4.42mgL-1, respectively. A clear control region was established for multiple inhibitions and the recoveries, which followed (pH 7.5-8.5, FA below 10mg/100mg NH4+-N and an FNA below 0.005mg/100mg NO2--N) for the purpose of optimizing the operation conditions of the UASB-anammox reactor.
AB - A UASB-anammox reactor was operated for 900days to study its process stability. The negative effects of free ammonia (FA) and free nitrous acid (FNA) were investigated over three separate inhibitions and recoveries. The IC10, IC50 and IC90 (inhibitory concentration/a 10%, 50% and 90% activity loss) of FNA and FA responding to the NH4+-N, NO2--N and TN removal efficiency were evaluated. In the 1st inhibition, the average FNA-IC10 observed was 0.67μgL-1 and the FA-IC10 for TN removal was 4.85mgL-1. In the 2nd inhibition, an FNA-IC10 of 0.44μgL-1 and an FA-IC10 of 3.56 were found. In the 3rd inhibition, however, both the FNA-IC10 and FA-IC10 were found to have increased, with values of 0.50μgL-1 and 4.42mgL-1, respectively. A clear control region was established for multiple inhibitions and the recoveries, which followed (pH 7.5-8.5, FA below 10mg/100mg NH4+-N and an FNA below 0.005mg/100mg NO2--N) for the purpose of optimizing the operation conditions of the UASB-anammox reactor.
KW - Free ammonia
KW - Free nitrous acid
KW - Inhibition factors
KW - Process recovery
KW - UASB stability
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U2 - 10.1016/j.biortech.2015.12.003
DO - 10.1016/j.biortech.2015.12.003
M3 - Article
C2 - 26722813
AN - SCOPUS:84951196562
SN - 0960-8524
VL - 203
SP - 132
EP - 141
JO - Bioresource Technology
JF - Bioresource Technology
ER -
