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Effect of aeration rates on hydraulic characteristics and pollutant removal in an up-flow biological aerated filter

Abstract

The biological aerated filter (BAF) is an effective biological treatment technology for pollutant removal in municipal wastewater secondary treatment. However, one potential drawback of the BAF system is the need for appropriate level aeration. The appropriate level of aeration can reduce the energy consumption of the BAF system and improve wastewater treatment efficiency. In this study, an up-flow BAF reactor was established to study the effect of aeration rates on pollutant removal, hydraulic characteristics, dissolved oxygen (DO), and the microbial community. A computational fluid dynamics (CFD) model that combined the Euler-Euler model, porous media model and turbulence model was used to simulate the flow behaviour under gas-liquid-solid three-phases at aeration rates ranging from 40 L/h to 90 L/h. The biofilm microbial community was analysed using high-throughput sequencing technology. The increase of the aeration rate reduced nitrogen removal and increased total phosphorus (TP) removal. The simulation results showed that the gas-liquid two phase velocity in the filter media layer presented an increasing trend with the aeration rates. The lower DO concentration at an aeration rate of 65 L/h showed that the condition could improve the abundance and activity of microbes. Planctomycetes, Nitrospirae and Proteobacteria were classified as nitrogen and phosphorus removal bacteria and were detected in all samples in the up-flow BAF. These results demonstrated that an aeration rate of 65 L/h improved the pollutant removal efficiency by forming a suitable DO and microbial community distribution. Optimizing the aeration rate can achieve efficient pollutant removal from the perspective of the flow field in an un-flow BAF.

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Publication details

The article was received on 13 Apr 2018, accepted on 12 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8EW00231B
Citation: Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript
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    Effect of aeration rates on hydraulic characteristics and pollutant removal in an up-flow biological aerated filter

    J. Ren, W. Cheng, T. Wan, M. Wang and M. Jiao, Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8EW00231B

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