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Preparation of Coagulants (Fe2(SO4)3, Al2(SO4)3) by Reusing Sludge from the Feedwater Treatment Plant and Testing the Ability of Orthophosphate (PO43−) Removal

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Proceedings of the International Conference on Advanced Mechanical Engineering, Automation, and Sustainable Development 2021 (AMAS2021) (AMAS 2021)

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

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Abstract

Besides particulate solids, colloids, and some natural organic substances, sludge from drinking water treatment plants (SDWTP) also contains Aluminum (Al) and Iron (Fe) compounds with the formation of Al(OH)3, Fe(OH)3 from the flocculation hydrolysis process. This paper reports the results of an exploratory experimental study to prepare a coagulant solution from SDWTP and utilize it for phosphorus treatment with the formation of PO43− as testing. The study used the Direct Titration method (DTM) and Reverse Titration method (RTM) for determining the content of Al3+ and Fe3+ contained in sludge samples, which were taken from the silt tank of two feedwater treatment plants at Daklak province, Vietnam. The study carried out series of experiments in the laboratory to recycle coagulants solution (Fe2(SO4)3, Al2(SO4)3) at different conditions: the ratio of mixing (sludge: sulphuric acid), reaction time, reaction temperature. The results showed that two sludge samples contained content of Al3+ higher than Fe3+, the content of Al3+ and Fe3+ are 1.762 mg.g−1, 0.028 mg.g−1 for Buon Ho plant sample (BHS) and 1.748 mg.g−1, 0.036 mg.g−1 for Eachu-Cap plant sample (ECS), respectively. At optimal conditions: the ratio of mixing is 10 g of sludge: 8 mL H2SO4 5 M, 60% of humidity; the reaction time is 5 h and 90 ℃ is the suitable reaction temperature. The efficiency of preparing is quite high, reaching 90.73% for Al3+ and 88.89% for Fe3+, respectively. Performance of orthophosphate treatment has reached 98,74% at the optimal conditions: pH 6, the volume of coagulant is 2.5 mL/200 mL wastewater, stirring time is 25–30 min. Besides, the efficiency of this testing is lower than that of Al2(SO4)3 insignificantly.

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Authors and Affiliations

  1. Faculty of Natural Science and Technology, Tay Nguyen University, Dak Lak, 630000, Vietnam

    Ha Tran Thi Minh

  2. Division of Sustainable Resources Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Duc Ho Gia

Authors
  1. Ha Tran Thi Minh
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  2. Duc Ho Gia
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Correspondence to Ha Tran Thi Minh .

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Editors and Affiliations

  1. Vietnam Association for Science Editing, Hanoi University of Science and Technology, Hanoi, Vietnam

    Banh Tien Long

  2. Department of Materials Science and Engineering, Inha University, Nam-gu, Korea (Republic of)

    Hyung Sun Kim

  3. School of Mechanical Engineering, Nagaoka University of Technology, Nagaoka, Japan

    Kozo Ishizaki

  4. Hanoi University of Science and Technology, Hanoi, Vietnam

    Nguyen Duc Toan

  5. Southern Federal University, Rostov-on-Don, Russia

    Ivan A. Parinov

  6. Department of Mechanical Engineering, Korea Maritime and Ocean University, Busan, Korea (Republic of)

    Yun-Hea Kim

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Minh, H.T.T., Gia, D.H. (2022). Preparation of Coagulants (Fe2(SO4)3, Al2(SO4)3) by Reusing Sludge from the Feedwater Treatment Plant and Testing the Ability of Orthophosphate (PO43−) Removal. In: Long, B.T., Kim, H.S., Ishizaki, K., Toan, N.D., Parinov, I.A., Kim, YH. (eds) Proceedings of the International Conference on Advanced Mechanical Engineering, Automation, and Sustainable Development 2021 (AMAS2021). AMAS 2021. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-99666-6_91

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  • DOI: https://doi.org/10.1007/978-3-030-99666-6_91

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-99665-9

  • Online ISBN: 978-3-030-99666-6

  • eBook Packages: EngineeringEngineering (R0)

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