Improvement of biofilm activities in sequencing batch reactor via polyvinyl alcohol (PVA) granules addition

  • Nguyen Xuan Lan Faculty of Environment, Hanoi University of Natural Resources and Environment, 41A Phu Dien road, Bac Tu Liem district, Hanoi, Vietnam https://orcid.org/0009-0009-0695-6218
  • Dang Thi Thanh Huyen Faculty of Environmental Engineering, Hanoi University of Civil Engineering, 55 Giai Phong road, Hai Ba Trung district, Hanoi, Vietnam https://orcid.org/0000-0002-0285-8567
  • Pham Thi Thuy Faculty of Environmental Sciences, University of Science, Vietnam National University, 334 Nguyen Trai road, Thanh Xuan district, Hanoi, Vietnam https://orcid.org/0000-0002-9557-7552
  • Nguyen Manh Khai Faculty of Environmental Sciences, University of Science, Vietnam National University, 334 Nguyen Trai road, Thanh Xuan district, Hanoi, Vietnam https://orcid.org/0000-0001-5561-4796
DOI: https://doi.org/10.31814/stce.huce2024-18(4)-05
Keywords: PVA, granules, biofilm, moving bed, sequencing batch reactor, SBR, wastewater

Abstract

Polyvinyl alcohol (PVA) (C2H4O)n is a synthetic polymer material commercially available on an industrial scale. In this study, two formulas were tested for preparing biofilm carriers in spherical shape from PVA/H3BO3 (formula 1) and PVA/NaNO3 (formula 2) crosslink bonds without activated sludge entrapment. Formula 2 gave better results with white, round, gel-textured, flexible, and firm carriers. The PVA/NaNO3 granules continued to be used as moving-bed biofilm carriers at a ratio of 10% of the working volume to evaluate the wastewater treatment capacity in the sequencing batch reactor (SBR). After five weeks of operation, the results showed that the PVA/NaNO3 granules turned light yellow due to the presence and development of aerobic biomass. The surface of PVA/NaNO3 granules was plump, elastic, not cracked, and settled well. The amount of biomass attached to the PVA/NaNO3 granules was 0.4 gTSS/g granules. The hydraulic settling velocity of the PVA/NaNO3 granules was 56 mm/s. The wastewater treatment efficiency of the SBR system using moving-bed biofilm activity developed on the PVA/NaNO3 granular carriers was evaluated according to the TSS, COD, and NH4+– N parameters at 88%, 90%, and 92%, respectively. The experimental results have demonstrated the potential of developing a new type of biofilm carriers from PVA polymer materials that offer good settling ability and resistance to hydraulic shear force during aeration. Therefore, PVA granules can be easily applied in the column SBR configuration.

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Published
25-12-2024
How to Cite
Lan, N. X., Huyen, D. T. T., Thuy, P. T., & Khai, N. M. (2024). Improvement of biofilm activities in sequencing batch reactor via polyvinyl alcohol (PVA) granules addition. Journal of Science and Technology in Civil Engineering (JSTCE) - HUCE, 18(4), 54–68. https://doi.org/10.31814/stce.huce2024-18(4)-05
Issue
Vol 18 No 4 (2024)
Section
Research Papers

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