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Abstract:
We present a start-up method for complete autotrophic nitrogen removal via the nitrite (CANON) granular sludge process by controlling the DO concentration. More specifically, we initially increase the activity of anaerobic ammonia-oxidizing bacteria (AnAOB) and, subsequently, gradually increase the activity of ammonia oxidizing bacteria (AOB). The results indicate the optimum process parameters to be an 8 h reaction period and an aeration/non-aeration time ratio of 1.0 h/0.25 h. These conditions maintain a high activity for both AOB and AnAOB and are also conducive to sludge granulation. Following 64 days of continuous operation, the mean particle size of the sludge increased to 992 mu m, while the proportion of granular sludge accounted for approximately 87.16%, and the proportion of sludge with a particle size >= 1000 mu m was 36.66%. Both AOB and AnAOB became the dominant bacterial genera in the CANON reaction system, while nitrite-oxidizing bacteria were successfully discharged from the reaction system.
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BIOCHEMICAL ENGINEERING JOURNAL
ISSN: 1369-703X
Year: 2021
Volume: 174
4 . 4 4 6
JCR@2021
3 . 7 0 0
JCR@2023
ESI Discipline: BIOLOGY & BIOCHEMISTRY;
ESI HC Threshold:104
JCR Journal Grade:2
CAS Journal Grade:3
Cited Count:
WoS CC Cited Count: 6
SCOPUS Cited Count: 7
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 3
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