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Feasibility of bubble surface modification for natural organic matter removal from river water using dissolved air flotation

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Abstract

A novel, functionalized bubble surface can be obtained in dissolved air flotation (DAF) by dosing chemicals in the saturator. In this study, different cationic chemicals were used as bubble surface modifiers, and their effects on natural organic matter (NOM) removal from river water were investigated. NOM in the samples was fractionated based on molecular weight and hydrophobicity. The disinfection byproduct formation potentials of each fraction and their removal efficiencies were also evaluated. The results showed that chitosan was the most promising bubble modifier compared with a surfactant and a synthetic polymer. Tiny bubbles in the DAF pump system facilitated the adsorption of chitosan onto microbubble surfaces. The hydrophobic NOM fraction was preferentially removed by chitosan-modified bubbles. Decreasing the recycle water pH from 7.0 to 5.5 improved the removal of hydrophilic NOM with low molecular weight. Likewise, hydrophilic organic compounds gave high dihaloacetic acid yields in raw water. An enhanced reduction of haloacetic acid precursors was obtained with recycle water at pH values of 5.5 and 4.0. The experimental results indicate that NOM fractions may interact with bubbles through different mechanisms. Positive bubble modification provides an alternative approach for DAF to enhance NOM removal.

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Acknowledgements

This research is funded by the National Natural Science Foundation of China (Grant No. 51378141) and the Science and Technology Department of Heilongjiang Province, China (Grant No. PS13H05). The authors would like to express thanks to their friends operating the Huainan first water treatment plant for their generous support. Sincerest thanks also to the staff at the Central Laboratory of Huainan Capital Water for their support in water sample analysis.

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Authors and Affiliations

  1. State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, China

    Yulong Shi, Jiaxuan Yang, Jun Ma & Congwei Luo

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  1. Yulong Shi
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  2. Jiaxuan Yang
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  3. Jun Ma
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  4. Congwei Luo
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Correspondence to Jun Ma.

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Shi, Y., Yang, J., Ma, J. et al. Feasibility of bubble surface modification for natural organic matter removal from river water using dissolved air flotation. Front. Environ. Sci. Eng. 11, 10 (2017). https://doi.org/10.1007/s11783-017-0954-2

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  • DOI: https://doi.org/10.1007/s11783-017-0954-2

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