Responses of Nitrifiers’ characteristics to Filling Ratio in IFAS Systems

DOI

10.2991/cmfe-15.2015.11How to use a DOI?

Keywords

IFAS; filling ratio; nitrification performance; AOB; NOB

Abstract

The concentrations of NH4+-N, NO2--N and NO3--N were measured in batch experiments to study nitrification kinetics in IFAS system with different FR at 0%-50%. The results showed that both of NH4+-N oxidation rate ( ) and NO3--N production rate ( ) increased with FR, which respectively increased from 6.3 to 16.9 mgNH4+-N•L-1•h-1 and 0.8 to 13.6 mgNO3--N•L-1•h-1. While the highest accumulation concentration of NO2--N fell from 51.8 to 9.0 mg•L-1. That was, higher FR instead went against to partial nitrification. Quantitative polymerase chain reaction (q-PCR) analysis revealed that increased FR caused an acceleration of the nitrifiers, which correlated linearly with the nitrification rate. Furthermore, the amount of nitrifiers per unit area in biofilm reached maximum at FR = 30%, and it was also the demarcation point when nitrifiers in biofilm outnumbered that in suspended sludge. Cumulative effect of nitrite occurred in the end of reaction when FR was less than 30%.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Liuchao Hu
AU  - Yue Wen
AU  - Qi Zhou
PY  - 2015/07
DA  - 2015/07
TI  - Responses of Nitrifiers’ characteristics to Filling Ratio in IFAS Systems
BT  - Proceedings of the International Conference on Chemical, Material and Food Engineering
PB  - Atlantis Press
SP  - 43
EP  - 46
SN  - 2352-5401
UR  - https://doi.org/10.2991/cmfe-15.2015.11
DO  - 10.2991/cmfe-15.2015.11
ID  - Hu2015/07
ER  -