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Huan Jing Ke Xue. 2017 Aug 8;38(8):3415-3421. doi: 10.13227/j.hjkx.201701185.

[Effect of Different TOC to NH4+-N Ratios on Nitrogen Removal Efficiency in the ANAMMOX Process].

[Article in Chinese]
Wang F1,2, Liu K1,2, Lin X1,2, Zhou Z1,2, Li X1,2, Huang Y1,2.

Author information

1
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
2
Institute of Environmental Biotechnology, Suzhou University of Science and Technology, Suzhou 215009, China.

Abstract

The effect of the TOC to NH4+-N ratio on nitrogen removal rate in an ANAMMOX sequencing batch reactor was studied for the short term and long term. Short-term results showed the maximum TOC/NH4+-N that ANAMMOX could afford was 1.4. At the same time, the rate of nitrogen removal was 0.26 kg·(m3·d)-1. The maximum nitrogen removal rate of 0.34 kg·(m3·d)-1 was obtained when TOC/NH4+-N was less than 0.4 in the long-term experiment. Whereas the nitrogen removal rate of the reactor decreased continuously when TOC/NH4+-N exceeded 0.4, and it was difficult to recover the activity of the ANAMMOX bacteria in the short term. qPCR results showed that the amount of ANAMMOX bacteria dropped from 2.9×1011 copies·mL-1 to 3.15×1010 copies·mL-1 with the increase of organics. When TOC/NH4+-N exceeded 1.6, NH4+-N could hardly be removed by the ANAMMOX bacteria, which were severely inhibited. The number of denitrifying bacteria was 3.0×109 copies·mL-1; meanwhile, most of the NO2--N in the reactor was removed via denitrification.

KEYWORDS:

ANAMMOX; TOC/NH4+-N; denitrification; organic matter; quantitative PCR

PMID:
29964952
DOI:
10.13227/j.hjkx.201701185
[Indexed for MEDLINE]

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