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Design of Precipitation System for the Removal of Total Suspended Solid, Turbidity and Mineral Content from Coal Processing Plant Wastewater

Author Affiliations

  • 1Chemical Engineering Department, University of Indonesia, Kampus UI Depok 16424, INDONESIA

Res.J.chem.sci., Volume 1, Issue (5), Pages 40-47, August,18 (2011)


A precipitation system was designed for the removal of total suspended solid (TSS) from wastewater coming from a coal processing plant (CPP). The wastewater from the studied CPP had a pH in the range of 3.4-3.6 with TSS and turbidity of 1000 and 150 mg·L-1, respectively. The selection and dose optimization of the cationic coagulants (Ferric chloride (FeCland Aluminium sulphate (Al[SO4l3)), inorganic polymer coagulant (Poly Aluminium Chloride (PAC)) and a commercial coagulant (brand name (N8100)) were carried out. The results showed that N8100 at 5 mg·L-1 dose and pH 6-8 gave the best performance with the final wastewater had TSS 10 mg·L-1, Turbidity 3 mg·L-1, Fe 0.11 mg·L-1, Mn and Al each 0.01 mg·L-1 (undetectable). These results were below the limit set by the Indonesian wastewater standard for coal mining industry. The designed precipitation system used for the removal of total suspended solid consisted of equalization pond (960 m), inlet channel with baffles and coagulant-lime control for optimum mixing and three identical sedimentation ponds (each with the lower dredge volume of 105 m and the whole pond volume of 675 m). These ponds retained the sediments for 3 months prior to cleaning. Coagulants N8100, FeCl, Al(SO4 andPAC had the operating costs 10.03 US$/day(lowest) 118.95, 22.06 and 21.77 US$/day, respectively. Besides the low operating cost N8100 had produced least sediments compared to FeCl, Al(SO4)3 and PAC.


  1. Belkin H.E. and Tewalt S.J., Geochemistry of Selected Coal Samples from Sumatra, Kalimantan, Sulawesi, and Papua, Indonesia. U.S. Geological Survey, Reston,Ch.1, 2 (2007)
  2. Allegre C., Maisseu M., Charbit F. and Moulin P., Coagulation–flocculation–decantation of dye house effluents., J. Hazard. Mater.,B116, 57–64 (2004)
  3. Miller, B.G., Coal Energy System, Elsevier Press, San Diego., Ch. 3, 77-118 (2005)
  4. Elmaleh S., Yahi H. and Coma J., Suspended Solids Abatement by pH Increase - upgrading of an Oxidation Pond Effluent Wat. Res., 30(10), 2357-236 (1996)
  5. Jiang J.Q., Development of coagulation theory and pre-polymerized coagulants for water treatment., Sep. Purif. Methods,30(1), 127–141 (2001)
  6. Lee, W., and Westerhoff, P., Dissolved organic nitrogen removal during water treatment by aluminum sulfate and cationic polymer coagulation. Wat. Res., 40, 3767–3774 (2006)
  7. Dominguez J.R., de Heredia J.B., Gonzalez, T., Sanchez-Lavado, F., Evaluation of ferric chloride as a coagulant for cork processing wastewaters: Influence of the operating conditions on the removal of organic matter and settleability parameters Ind. Eng. Chem. Res., 44, 6539– 6548 (2005)
  8. Domnguez J.R., Gonzalez T., Garca H.M., Sanchez-Lavado, F., de Heredia, J.B., Aluminium sulfate as coagulant for highly polluted cork processing wastewaters: Removal of organic matter, J. of Haz. Mat.,148, 15–21 (2007)
  9. Gao B.Y., Chu Y.B., Yue Q.Y., Wang B.J. and Wang S.G., Characterization and coagulation of a poly-aluminium chloride (PAC) coagulant with high Al13content., J. of Envi. Man.,76, 143–147 (2005)
  10. Ching H.W., Tanaka T.S., and Elimelech M., Dynamics of coagulation of kaolin particles with ferric chloride. Wat. Res., 28, 559 (1994)
  11. Duan J. and Gregory J.F., Coagulation by Hydrolysing Metal Salts. Adv. Colloid Interf. Sci., 100, 475–502 (2003)
  12. Dentel S.K., and Gossett J.M. Mechanisms of coagulation with aluminium salts, J. Am. Water Wks. Assoc., 80, 187–198 (1988)
  13. Bertsch P.M., Aqueous polynuclear aluminum species. In: Sposite, G. (Ed.), The Environmental Chemistry of Aluminium, CRC Press, Boca Raton, 87–15 (1989)
  14. Qasim S.R., Motley E.M., and Zhu G., Water Works Engineering Planning, Desain and Operation, Prentice Hall: USA(2000)
  15. East-Kalimantan Governor Law, Keputusan Gubernur Kalimantan Timur Law Nr. 26 on Standard of Wastewater Disposal from Coal stone washing (Baku Mutu Limbah Cair Bagi Kegiatan Pencucian Batubara, Indonesian) (2002)
  16. Environmental Ministry Act, Kep Men LH Act Nr. 113 on Standard of Wastewater Disposal from Coal and Mining Industry, Appendix II (Baku Mutu Air Limbah Pengolahan/Pencucian Batu Bara Lampiran II, Indonesian) (2003)
  17. Sundstrom D.W. and Klei H.E., Wastewater Treatment, Prentice-Hall, Englewood Cliffs,Ch.12,335-355 (1979)
  18. Lin L.Jr., Huang C.P., Chin C.J.M., Pan J.R., The Origin of Al(OH)-rich and Al13-aggregate flocks composition in PACl coagulation, Wat. Res.,43(17),4285-4295 (2009)
  19. Li T., Zhu Z., Wang D., Yao C. and Tang H., Characterization of flock size, strength and structure under various coagulation mechanisms, Powder Technol, 168, 104–110 (2006)
  20. Bolto B. and Gregory J., Organic polyelectrolytes in water treatment, Wat. Res.,41(11), 2301-2324 (2007)
  21. Neethling J.B. and Benisch M., Struvite control through process and facility design as well as operation strategy, Wat. Scie. and Tech., 49(2), 191-199 (2004)