One-step start-up and subsequent operation of CANON process in a fixed-bed reactor by inoculating mixture of partial nitrification and Anammox sludge

• Published in: Chemosphere (Oxford) Vol. 275; p. 130075
• Main Authors: Wang, Xian, Wang, Tao, Yuan, Luzi, Xing, Fanghua
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.07.2021
• Subjects: CANON process; FBR; One-step start-up; Operation performances; CANON process; One-step start-up; FBR; Operation performances
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2021.130075

The feasibility of one-step start-up of CANON process in a FBR by inoculating mixture of partial nitrification and Anammox sludge as well as its subsequent operation performances were investigated in the present study. The FBR was operated for around 3 months. The CANON process was quickly started up within 21 days. The max total nitrogen (TN) removal rate reached 183.61 g m−3 d−1 with the TN removal efficiency of 91.81% on day 95. The CANON process exhibited a good capability for resistance to loading shock and restoration from the unstable state. The mature CANON biofilms displayed a morphology of aggregates and had porous and microporous structure. The structural characteristics of the biofilms were conducive to improve the transferring of substrates and products. AOB and Anammox bacteria absolutely predominated in the mature biofilms and furthermore established a balanced interaction relationship. The microbial community structure contributed to the relatively stable operation performances. [Display omitted] •A FBR was seeded with mixture of partial nitrification and Anammox sludge.•Quick start-up of CANON process was achieved within 21 days.•The max TN removing rate reached 183.61 g m−3 d−1 on day 95.•AOB and Anammox bacteria were accumulated and dominant in the cultivated biofilms.•The pores and micropores were found in the mature CANON biofilms.