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Advanced removal of water NOM by Pre-ozonation, Enhanced coagulation and Bio-augmented Granular Activated Carbon

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Abstract

Natural organic matters as intrinsic microorganic pollutants are a major concern in drinking water in scopes of water supply systems operation, consumer health, aesthetic and so on. This study was done on the real water samples that was first experienced in using integrated processes (pre-ozonation, enhanced coagulation and bio-augmented carbon) for upgrading existing processes of water treatment plant. The parameters of TOC, DOC, UV254, SUV, appearance color, turbidity, pH, TDS, heterotrophic plate count (HPC) and residual bromate were tested after each process. It was revealed that, using 0.5 mg O3/mg TOC, 15 mg/l polyaluminium chloride (PACl), pH = 7.5 and empty bed contact time (EBCT) of 5 min in bio-filter, the removal of TOC is 87%. The concentration of TOC in finished water was 0.8 mg/l that less than standard limit for chlorination (2 mg/l) without formation of bromate as carcinogenic by-product. Upgrading of existing plant by suggested process, not only could remove natural organic matters (NOMs) significantly but also protect reservoir and distribution network against regrowth of biofilm.

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Acknowledgments

This article was extracted from a MSc thesis of Environmental Health Sciences (Grant No 15922) which was supported by Shiraz University of Medical Sciences.

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Authors and Affiliations

  1. MSc of Environmental Health Engineering, Department of Environmental Health Engineering, School of Health, Student research committee, Shiraz University of Medical Sciences, Shiraz, Iran

    M. A. Mirnasab

  2. Research Center for Health Sciences, Department of Environmental Health Engineering, Institute of Health, School of Health, Shiraz University of Medical Sciences, 71645-111, Shiraz, Iran

    Hassan Hashemi, M. R. Samaei & A. Azhdarpoor

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  1. M. A. Mirnasab
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  2. Hassan Hashemi
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Correspondence to Hassan Hashemi.

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Editorial responsibility: R Saravanan.

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Mirnasab, M.A., Hashemi, H., Samaei, M.R. et al. Advanced removal of water NOM by Pre-ozonation, Enhanced coagulation and Bio-augmented Granular Activated Carbon. Int. J. Environ. Sci. Technol. 18, 3143–3152 (2021). https://doi.org/10.1007/s13762-020-03039-7

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  • DOI: https://doi.org/10.1007/s13762-020-03039-7

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