TY - JOUR
T1 - Operation stability and recovery performance in an Anammox EGSB reactor after pH shock
AU - He, Shilong
AU - Zhang, Yanlong
AU - Niu, Qigui
AU - Ma, Haiyuan
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 Fellows (25 03736 and 26 04044) and JSPS Bilateral joint research propjets with CAS (Chinese Academy of Science).
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - An Anaerobic ammonia oxidation (Anammox) expanded granular sludge bed (EGSB) reactor was investigated with a long-term continuous operation. The nitrogen removal performance and stability of process subjected to transient pH shock (decreased from 9.0 to 7.0 and maintaining for 24 h) were evaluated. In the steady stage, the nitrogen loading rate (NLR) and nitrogen removal rate (NRR) can reach to 10 and 8.5 kg-m-3 d-1, respectively. However, the system had a low tolerance for transient pH shock. The deterioration of the granule sludge properties and the inhibition of specific Anammox activity (SAA) resulted in the destabilization of the EGSB after pH shock. The main factors governing the treatment performance of EGSB were the high concentration of free nitrous acid (FNA) and free ammonia (FA). However, the lower than 10% reduction of ammonia removal can be maintained when FA and FNA were lower than 15 mg l-1 and 15 μg l-1, respectively. The process was successfully recovered by controlling the FNA and FA concentration after the low pH shock.
AB - An Anaerobic ammonia oxidation (Anammox) expanded granular sludge bed (EGSB) reactor was investigated with a long-term continuous operation. The nitrogen removal performance and stability of process subjected to transient pH shock (decreased from 9.0 to 7.0 and maintaining for 24 h) were evaluated. In the steady stage, the nitrogen loading rate (NLR) and nitrogen removal rate (NRR) can reach to 10 and 8.5 kg-m-3 d-1, respectively. However, the system had a low tolerance for transient pH shock. The deterioration of the granule sludge properties and the inhibition of specific Anammox activity (SAA) resulted in the destabilization of the EGSB after pH shock. The main factors governing the treatment performance of EGSB were the high concentration of free nitrous acid (FNA) and free ammonia (FA). However, the lower than 10% reduction of ammonia removal can be maintained when FA and FNA were lower than 15 mg l-1 and 15 μg l-1, respectively. The process was successfully recovered by controlling the FNA and FA concentration after the low pH shock.
KW - Anammox
KW - Expanded granular sludge bed
KW - Free ammonia
KW - Free nitrous acid
KW - PH shock
KW - Treatment performance
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U2 - 10.1016/j.ecoleng.2016.01.084
DO - 10.1016/j.ecoleng.2016.01.084
M3 - Article
AN - SCOPUS:84958061621
SN - 0925-8574
VL - 90
SP - 50
EP - 56
JO - Ecological Engineering
JF - Ecological Engineering
ER -