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Behavior of Sludge Dewaterability and Nutrient Contents after Treatment with Cellulose-Based Flocculants with Combined PTS and Catalytic Behavior of Sludge towards Tetracycline Degradation

Author

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  • Jannatul Rumky

    (Department of Separation Science, LUT University, Sammonkatu 12, FI-50130 Mikkeli, Finland)

  • Ekaterina Bandina

    (Department of Separation Science, LUT University, Sammonkatu 12, FI-50130 Mikkeli, Finland)

  • Eveliina Repo

    (Department of Separation Science, LUT University, Sammonkatu 12, FI-50130 Mikkeli, Finland)

Abstract

Wastewater treatment plants are increasingly interested in adopting inorganic coagulants and organic flocculants in their sludge treatment process since sludge disposal costs more than half of the overall operational costs. This study synthesized poly titanium sulfate (PTS) by different molar ratios and used the best one with cellulose-based flocculants for sludge conditioning. PTS synthesized with a 1:2 molar ratio showed the lowest capillary suction time (CST) of sludge and was selected for further studies with cellulose-based flocculants. As bio-based flocculants have gained popularity due to current environmental problems, cationized cellulose-based flocculants (Ce-CTA) were used in this work with or without PTS for sludge treatment. After coagulation–flocculation, dewaterability of sludge enhanced, and the Lowry and Anthrone method was used to assess proteins and polysaccharides. Next, metal content and nutrients such as total phosphorus, phosphate, and nitrate were measured by ICP-OES and IC, and we found promising results of phosphate especially at pH 3. Higher total phosphorus content was found at pH 3 and 9, and even at pH 6 after PTS or PTS+Ce-CTA treatment. In addition, PTS-treated sludge materials also showed catalytic behavior, suggesting a new research avenue for future development. Based on this study, the PTS+Ce-CTA combination is promising for sludge treatment and nutrient recovery, along with the possibility for the further valorization of the sludge materials.

Suggested Citation

  • Jannatul Rumky & Ekaterina Bandina & Eveliina Repo, 2023. "Behavior of Sludge Dewaterability and Nutrient Contents after Treatment with Cellulose-Based Flocculants with Combined PTS and Catalytic Behavior of Sludge towards Tetracycline Degradation," Resources, MDPI, vol. 12(2), pages 1-14, January.
    • Handle: RePEc:gam:jresou:v:12:y:2023:i:2:p:17-:d:1039055
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    References listed on IDEAS

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    1. Johannes Kiefer & Alexander Stärk & Agnita Lynda Kiefer & Heike Glade, 2018. "Infrared Spectroscopic Analysis of the Inorganic Deposits from Water in Domestic and Technical Heat Exchangers," Energies, MDPI, vol. 11(4), pages 1-8, March.
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