Effects of carrier-attached biofilm on oxygen transfer efficiency in a moving bed biofilm reactor

doi:10.1007/s11783-015-0822-x

Front. Environ. Sci. Eng.

2016, Vol. 10

Issue (3) : 569-577 https://doi.org/10.1007/s11783-015-0822-x

RESEARCH ARTICLE

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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Abstract

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 Author(s): 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.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-015-0822-x
https://academic.hep.com.cn/fese/EN/Y2016/V10/I3/569

Fig.1 (a) Schematic of laboratory MBBR system and off-gas analysis equipment; (b) suspended carrier

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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