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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2016, Vol. 10 Issue (3) : 569-577
Effects of carrier-attached biofilm on oxygen transfer efficiency in a moving bed biofilm reactor
Yanling WEI,Xunfei YIN,Lu QI(),Hongchen WANG,Yiwei GONG,Yaqian LUO
School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
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Three laboratory-scale moving bed biofilm reactors (MBBR) with different carrier filling ratios ranging from 40% to 60% were used to study the effects of carrier-attached biofilm on oxygen transfer efficiency. In this study, we evaluated the performance of three MBBRs in degrading chemical oxygen demand and ammonia. The three reactors removed more than 95% of NH4+-N at an air flow-rate of 60 L·h-1. The standard oxygen transfer efficiency (αSOTE) of the three reactors was also investigated at air flow-rates ranging from 60 to 100 L·h-1. These results were compared to αSOTE of wastewater with a clean carrier (no biofilm attached). Results showed that under these process conditions, αSOTE decreased by approximately 70% as compared to αSOTE of wastewater at a different carrier-filling ratio. This indicated that the biofilm attached to the carrier had a negative effect on αSOTE. Mechanism analysis showed that the main inhibiting effects were related to biofilm flocculants and soluble microbial product (SMP). Biofilm flocs could decrease αSOTE by about 20%, and SMP could decrease αSOTE by 30%–50%.

Keywords carrier      biofilm      oxygen transfer efficiency      moving bed biofilm reactor     
Corresponding Authors: Lu QI   
Online First Date: 08 October 2015    Issue Date: 05 April 2016
 Cite this article:   
Yanling WEI,Xunfei YIN,Lu QI, et al. Effects of carrier-attached biofilm on oxygen transfer efficiency in a moving bed biofilm reactor[J]. Front. Environ. Sci. Eng., 2016, 10(3): 569-577.
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Yanling WEI
Xunfei YIN
Hongchen WANG
Yiwei GONG
Yaqian LUO
Fig.1  (a) Schematic of laboratory MBBR system and off-gas analysis equipment; (b) suspended carrier
Tests aeration rate /(L?h-1) batch reactors time /d aim
1 2 3
different filling ratio 60 40% 50% 60% 190-211 to investigate the effect of carrier-attached biofilm with different filling ratio on OTE
differentair flow rate 60 50% 190-211 to investigate theeffect of carrier-attached biofilm with different air flow rate on OTE
80 50% 214-225
100 50% 228-240
Tab.1  Experimental conditions applied in all tests
Fig.2  Variation of COD and N H 4 + -N in the influent and effluent, and removal efficiency at three different carrier filling ratios: (a), (b) 40% carrier filling ratio; (c), (d) 50% carrier filling ratio; (e), (f) 60% carrier filling ratio
Fig.3  Oxygen transfer efficiency at three different filling ratios under process and wastewater conditions: (a) αSOTE of 40% reactor, (b) αSOTE of 50% reactor, (c) αSOTE of 60% reactor; αSOTE under wastewater conditions (Δ), and αSOTE under process conditions (?) of each reactor is shown in (a–c)
Fig.4  αSOTE under wastewater and process conditions with different air flow-rates: αSOTE under wastewater conditions (Δ); αSOTE under process conditions (?)
Fig.5  Relationship between αSOTE and OUR
Fig.6  (a) Biofilm biomass of 40% carrier filling ratio during tests; (b) the correlation between αSOTE under process conditions and biofilm biomass; (c) the correlation between OUR and MLVSS
Fig.7  (a) αSOTE under process, wastewater, and effluent conditions; (b) the effect of SMP on αSOTE
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