Water Treatment by Coagulation-Flocculation Using Ferric Sulphate as Coagulant

https://doi.org/10.22146/ajche.49754

Hary Sulistyo(1*), Wahyudi Budi Sediawan(2), Sarto Sarto(3), Yusuf Yusuf(4), Ronald Nainggolan(5)

(1) Chemical Engineering Department, Gadjah Mada University, Yogyakarta, Indonesia.
(2) Chemical Engineering Department, Gadjah Mada University, Yogyakarta, Indonesia.
(3) Chemical Engineering Department, Gadjah Mada University, Yogyakarta, Indonesia.
(4) Chemical Engineering Department, Gadjah Mada University, Yogyakarta, Indonesia.
(5) Chemical Engineering Department, Gadjah Mada University, Yogyakarta, Indonesia.
(*) Corresponding Author

Abstract


Coagulation and flocculation are two essential processes in water treatment. Their improvement on effectiveness and efficiency will give a significant influence for the overall process. The coagulation and flocculation processes involve a coagulant subsequently used to form flocks that can sink precipitate easily. In this research, the sample taken from Sermo Reservoir located in Kulon Progo Regency. The water was containing 320 ppm of colloid and suspended solids. Here, using a magnetic mixer stirrer, 500ml of raw water was mixed with a certain dosage of ferric sulfate in that used as the coagulant at a certain pH in a beaker glass through a high-speed mixing (240 rpm) for five minutes and low-speed mixing (60 ppm) for 10 minutes, respectively. Subsequently, the absorption was measured using UV/Visible. The result then shows 100 ppm for the optimum dosage of ferric sulfate and 9 for the optimum pH. The results indicate that a higher precipitation constant (kd) has resulted in a higher flock diameter. The correlation between the precipitation constant (kd) and the Reynolds number can be expressed as the following equation, kd = 51.98 Re0.3735 with an average relative error of 9.8%.

Keywords


Water Treatment, Coagulation, Flocculation, Suspended Solids, Precipitation Constant

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References

  1. Adin, A., Soffer, Y. and Ben Aim, R., 1998,”Effluent pretreatment by Iron Coagulation Applying Various dose-pH Combination for Optimum Particle Separation”, Water Res., 32, 27-34.
  2. Aguilar, M.I., Saez, J., Llorens, M., Soler, A. And Ortuno, J.F., 2003,” Microscopic Oservation of Particle Reduction in Slaughterhouse Wastewater by Coagulation-Flocculation Using ferric sulphate as Coagulant and different Coagulant Aids”, Water Res., 37, 2233-2241.
  3. Muhle, K., 1985,”Particle Adhesion in Coagulation and Bridging Flocculation”, Colloid and Polymer Sci, 263 (8), 660 – 672.
  4. Novita, E., 2001, “Optimasi Proses Koagulasi dan Flokulasi pada Limbah Cair yang Mengadung Melanoidin”, Jurnal ILMU DASAR, Vol.2 No.1, 61-67
  5. O’Melia, C.R., Hahn, M.W. and Chen, C.T., 1997,”Some Effects of Particle Size in Separation Processes Involving Colloids”, Water Sci. Tecl., 36 (4), 119 -126. Powel, T.G., 1954, “Water Conditioning For Industry”, pp.19-53, Kogakusha Co., Ltd., Japan
  6. Ronnholm, M.R., Warna, J., Salmi, T., Turunen, I. and Luoma, M., 1999,” Kinetics of Oxidation of Ferrous Sulfate with Molecular Oxygen”, Chem. Eng. Sci.. 54. 4223-4232.
  7. Sorochenko, V.F., 2003, “Effect of Aluminum Ion on Coagulation of Disperse Systems in Plant Wastewaters”, Chemistry and Technology of Fuels and Oils, 39 (4), 221 –231.
  8. Sulistryo, H., Rahayu, S.S., Sediawan, W.B. Sarto, 2006, “Pengolahan Limbah Besi Mendjadi Bahan Flokulan dan Besi Spons”. Research Report for Competitive Research Grant XIV/1, Gadjah Mada University, Yogyakarta
  9. Tchobanoglous, G., Burton, F.L. and Stensel, H.D., 2003, Wastewater Engineering, 4th ed., pp. 343 - 383 ,pp. H.D., 2003, Wastewater Engineering, 4th ed., pp. 343 - 383 ,pp.854-896 , Metcalf & Eddy, Inc., McGraw Hiil.



DOI: https://doi.org/10.22146/ajche.49754

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ASEAN Journal of Chemical Engineering  (print ISSN 1655-4418; online ISSN 2655-5409) is published by Chemical Engineering Department, Faculty of Engineering, Universitas Gadjah Mada.