Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Operation evaluation of DAF pilot plant for water treatment process in Hoedong Reservoir

회동수원지의 정수처리 공정을 위한 DAF pilot plant 운영 성능평가

  • Maeng, Minsoo (Department of Environmental and Safety Engineering, Ajou University) ;
  • Shahi, Nirmal Kumar (Department of Civil Environmental Engineering, Dankook University) ;
  • Kim, Donghyeun (Department of Civil Environmental Engineering, Dankook University) ;
  • Shin, Gwyam (Department of Environmental and Safety Engineering, Ajou University) ;
  • Dockko, Seok (Department of Civil Environmental Engineering, Dankook University)
  • 맹민수 (아주대학교 환경안전공학과) ;
  • ;
  • 김동현 (단국대학교 토목환경공학과) ;
  • 신귀암 (아주대학교 환경안전공학과) ;
  • 독고석 (단국대학교 토목환경공학과)
  • Received : 2020.08.05
  • Accepted : 2020.11.18
  • Published : 2020.12.15
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Abstract

A 1,000 ㎥/d DAF(dissolved air flotation) pilot plant was installed to evaluate the performance of the floating process using the Nakdong River. Efficiency of various DAF operations under different conditions, such as hydraulic loading rate, coagulant concentration was evaluated in the current research. The operation conditions were evaluated, based on the removal or turbidity, TOC(total organic carbon), THMFP(trihalomethane formation potential), Mn(manganese), and Al(aluminum). Also, particle size analysis of treated water by DAF was performed to examine the characteristics of particles existing in the treated water. The turbidity removal was higher than 90%, and it could be operated at 0.5 NTU or less, which is suitable for the drinking water quality standard. Turbidity, TOC, and THMFP resulted in stable water quality when replacing the coagulant from alum to PAC(poly aluminum chloride). A 100% removal of Chl-a was recorded during the summer period of the DAF operations. Mn removal was not as effective as where the removal did not satisfy the water quality standards for the majority of the operation period. Hydraulic loading of 10 m/h, and coagulant concentrations of 40 mg/L was determined to be the optimal operating conditions for turbidity and TOC removal. When the coagulant concentration increases, the Al concentration of the DAF treated water also increases, so coagulant injection control is required according to the raw water quality. Particle size distribution results indicated that particles larger than 25 ㎛ showed higher removal rates than smaller particles. The total particel count in the treated water was 2,214.7 counts/ml under the operation conditions of 10 m/h of hydraulic loading rate and coagulant concentrations of 60 mg/L.

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References

  1. Ahn, S.M. (2020). The assessment of Blue-green Alage Microcystis Elimination Effect and Rist of Loess, Coagulants and Algicids, Master's Thesis, Daegu University, Daegu, Korea, 23-26.
  2. Amato, T., Park, K., Yim, W., and Kim, T. (2013). SWRO pre-treatment design using high-rate dissolved air flotation including preliminary plot-scale result, Desalin. Water Treat., 51(7-9), 1804-1816. https://doi.org/10.1080/19443994.2012.694231
  3. Cho, H.K., Lim, H.J., and Kim, S.M. (2018). Comparison of water quality before and after four major river project for water monitoring stations located near 8 weirs in Nakdong river, J. Agric. Life Sci, 52(6), 89-101. https://doi.org/10.14397/jals.2018.52.6.89
  4. Edzwald, J.K. (2010). Dissolved air flotation and me, Water Res., 44, 2077-2106. https://doi.org/10.1016/j.watres.2009.12.040
  5. Fanaie, V.R., Khiadani, M., Ayres, T. (2019). Effects of internal geometry on hydrodynamics of dissolved air flotation (DAF) tank: An experimental study using particle image velocimetry (PIV), Colloids Surf. A Physicochem. Eng. Asp., 575, 382-390. https://doi.org/10.1016/j.colsurfa.2019.05.027
  6. Fernanda, C.P., Rocha, E.S., Nathalia, M.P., Rocha, E.S, Juliana, M.L., Raquel, D.R., Valdemir, A.S., and Leonie, A.S. (2018). Dissolved air flotation combined to biosurfactants: a clean and efficient alternative to treat industrial oily water, Rev. Environ. Sci. Biotechnol., 17, 591-602. https://doi.org/10.1007/s11157-018-9477-y
  7. Filho, J.A., Azevedo, A., Etchepare, R., and Rubio, J. (2016). Removal of sulfate ions by dissolved air flotation (DAF) following precipitation and flocculation, Int. J. Miner. Process, 149, 1-8. https://doi.org/10.1016/j.minpro.2016.01.012
  8. Jeong, I.G., Yi, M.J., Zhao, H., and Dockko, S. (2015). Characteristics of DBPs reduction of AOM by dissolved air flotation, Desalin. Water Treat., 54, 1436-1444. https://doi.org/10.1080/19443994.2014.917990
  9. Kim, S.B., Lee, S.U., Lee, S.H., Han, M.Y., Park, H.J., and Kim, T.I. (2017a). Determination of flocculatio design and operating condition of bubble generating system for high rate DAF, J. Water Treat., 25(5), 67-75.
  10. Kim, T.I., Temesgen, T., Park, H.J., and Han, M.Y. (2017b). Physical characteristics of bubbles in dissolved air flotation processes in seawater reverse osmosis desalination plants, Desalin. Water Treat., 70, 19-23. https://doi.org/10.5004/dwt.2017.20359
  11. Kim, Y.W., Lee, J.H., Park, T.J., and Byun, I.G. (2017c). Variatio of water environment and algae occurrence characteristics after weirs construction at Mulgeum site in downstream of the Nakdong river, J. Korean Soc. Hazard Mitig., 17(1), 383-392. https://doi.org/10.9798/KOSHAM.2017.17.1.383
  12. Kwon, S.B., Lee, K.H., Kim, Y.S., and Jeong. S.G. (2009). "Reduction of Fe, Mn using DAF and ozone/DAF hybride process" Proceedings of Korean socienty of water and wastewater, Korean Society on Water Environment, Seoul, Korea.
  13. Maeng, M.S., Shahi, N.K., Shin, G.Y., Son, H.J., Kwak, D.H., and Dockko, S. (2018). Formation characteristics of carbonaceous and nitrogenous disinfection by-products depending on residual organic compunds by CGS and DAF, Environ. Sci. Pollut. Res., 26, 34008-34017.
  14. Maeng, M.S., Shahi, N.K., and Dockko, S. (2020). Reduction characteristics of disinfection by-product (DBPs) generated by allogenic organic matter (AOM) using micro-hollow beads in terms of particulate removal, Desalin. Water Treat., 175, 402-411. https://doi.org/10.5004/dwt.2020.24944
  15. Moghaddam, S.S., Moghaddam, M.R., and Arami, M. (2010). Coagulation/flocculation process for dye removal using sludge from water treatment plant: Optimization through response surface methodology, J. Hazard. Mater., 175(1-3), 651-657. https://doi.org/10.1016/j.jhazmat.2009.10.058
  16. Oh, H.S., Kang, S.H., Nam, S.H., Kim, S.H., and Hwang, T.M. (2019). CFD modeling of cyclonic-DAF (dissolved air flotation) reactor for algae removal, Eng. Sci. Technol. Int. J., 22, 477-481.
  17. Park, H.G., Jung, E.Y., Son, H.J., and Choi, J.T. (2017). Reduction of blue-green algae and its by products using intake of deep water in summer, J. Environ. Sci. Int., 26(3), 393-399. https://doi.org/10.5322/JESI.2017.26.3.393
  18. Park, J.S., Kim, Y.J., Kim, M.J., and Lee, W.H. (2019). A novel method for cell countin gof Microcysits colonies in water resources using a digital imaging flow cytometer and microscope, Enviorn. Eng. Res., 24(3), 397-403.
  19. Richared, S., and Piet, L. (2004). Young researcher 2004. International Water Association, Cardiff.
  20. Wang, Z., Chen, Y., Xie, P., Shang, R., and Ma, J. (2016). Removal of microcysits aeruginosa by UV-activated persulfate: performance and characteristics, Chem. Eng. J., 300, 245-253. https://doi.org/10.1016/j.cej.2016.04.125
  21. Yulia, S., Barun, L.K., Adam, C.H., Belinda, L., Rita, K.H., and Pierre, L.C. (2016). Enhancing organic matter removal in desalination pretreatment systems by application of dissolved air flotation, Desalination, 383, 12-21. https://doi.org/10.1016/j.desal.2015.12.018