Effects of particle sizes and C/N ratios on the nitrogen removal performance in CANON system

doi:10.7523/j.issn.2095-6134.2018.06.017

Abstract

Abstract: High ammonia nitrogen wastewater was treated in an integrated anaerobic ammonia oxidation SBR reactor. Effects of particle sizes (R₁:0.2-0.5mm,R₂:0.5-1mm,R₃:>1mm) and C/N ratios on the nitrogen removal from granular sludge were studied. The results showed that the AOB activities of R₁, R₂ and R₃ decreased in turn; R₂ had the highest NOB activity, followed by R₁, and R₃ had the lowest; and R₂ had the highest activity of ANAMMOX, followed by R₁, and R₃ had the lowest. When the C/N ratio increased, the granular sludge morphology changed obviously, and microscopic examination showed that the middle red part gradually reduced and peripheral yellow encirclement occurred. The total nitrogen removal load reduced from 0.59kg/(m³·d) to 0.34kg/(m³·d), and the total nitrogen removal rate increased from 94.75% to 95.07% and then decreased to 87.55%. The results showed that the C/N ratio should not exceed 1.5 in CANON process.

Key words: anaerobic ammonia oxidation, granule sizes, granules, C/N ratio

CLC Number:

X703

LI Jinqing, HAN Xiaoyu, HUANG Jing, ZHANG Shujun, LIU Honghui, LIU Xinchun. Effects of particle sizes and C/N ratios on the nitrogen removal performance in CANON system[J]. , 2018, 35(6): 845-850.

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