Removal of Water Turbidity by Different Coagulants

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Abbas H. Sulaymon
Muna Y. Abdul-Ahad
Roaa A. Mahmood


During the last decade, there has been a concern about the relation between aluminum residuals in treated water and Alzheimer disease, and more interest has been considered on the development of natural coagulants. The present study aimed to investigate the efficiency of alum as a primary coagulant in conjunction with mallow, Arabic gum and okra as coagulant aids for the treatment of water samples containing synthetic turbidity of kaolin. Jar test experiments were carried out for initial raw water turbidities 100, 200 and 500 (NTU). The optimum doses of alum, mallow, Arabic gum and okra were 20, 2, 1 and 1 mg/L for100 NTU turbidity level, 35, 4, 2 and 3 mg/L , for 200NTU turbidity level and 50, 8, 10 and 8 mg/L for 500 NTU turbidity level, respectively. The optimum pH was 7 for alum, and 7.5 for mallow, Arabic gum and okra. The residual turbidity was 3.34 to 6.81 NTU by using alum as a primary coagulant with mallow, Arabic gum and okra, and pH values of the treated water by the natural coagulants were 6.1 to 7.01. The optimum dose of the
natural coagulants in the present study has higher efficiency in removing high turbidity in comparison with low turbidity.
Natural coagulant showed many advantages in coagulation/flocculation process. By using natural coagulants, considerable decreasing in Al2(SO4)3 consumption, and Increasing in the rate of sedimentation can be achieved.

Article Details

How to Cite
“Removal of Water Turbidity by Different Coagulants” (2013) Journal of Engineering, 19(12), pp. 1566–1575. doi:10.31026/j.eng.2013.12.04.

How to Cite

“Removal of Water Turbidity by Different Coagulants” (2013) Journal of Engineering, 19(12), pp. 1566–1575. doi:10.31026/j.eng.2013.12.04.

Publication Dates


• A1-Wandawi, 1983, "Chemical composition of seeds of two okra cultivers Agric Food Chem",vol. 31:1355-1358.

•Connachie, G. L., Folkard, G.K., Matawali, M. A. and Surtherland, J.P., 1999 “Field trials of appropriate hydraulic flocculation process” J. Water Research, 33 (6), 1425-1434.

•Divakaran R. and Pillai V. N. S. 2001 “Flocculation of Kaolinite suspensions in water by Chitosan”. J. Water Research. 35 (16), 3904-3908.

•Ebeling, J.M., Sibrell, P., Ogden, S.,and Summerfelt, S., 2003, "Evaluation of chemical coagulation_/flocculation aids for the removal of suspended solids and phosphorus from intensive recirculating aquaculture effluent discharge. Aquaculture Engineering", 29: 23-42.

•Fatoki O. and Ogunfowokan, A., 2002, " Effect of coagulant treatment on the metal composition of raw water", 28(3):293-298.

•Foust A.S., Wenzel L.A., Clump C.W. and Andersen L.B 2004, Principles of Unit Design and Operation, 2nd edition, New York: Addison Wesley, 2004.

•Ghebremichael, K. A., 2004, "Moringa seed and pumice as natural alternative materials for drinking water treatment", Ph. D. Thesis, Royal Institute of Technology,Stockholm, Sweden.

•Hoontrakul, S., 2006, "Evaluation of Coefficients Related to Flock Strength in Multilayer Floating Plastic Media Flocculator", Master’s thesis, Kasetsart University.

•Labib A., Abd El-Latife S. and Omran H., 1997 "Quality indices of Jew's mallow and spinach during frozen storage", Plant Foods for Human Nutrition vol.50, pp.333-347,

•Lin, S.D., Evans, R.L. and Beuscher, D.B., 1971. Algal Removal by Alum Coagulation. Illinois State Water Survey Division, Report of Investigation 68, Urbana, 1-19.

•Mackenzie, L.D., Cornwell, D.A., 1991. Introduction to Environmental Engineering. 2 nd Ed. McGraw Hill, New York, 157-163.

•Patale V. and Parikh P., 2010 "A Preliminary Study on Coccinia Indica Fruit Mucilage Extract as Coagulant-Flocculent for Turbid Water Treatment", PRAJÑĀ - Journal of Pure and Applied Sciences, Vol. 18, pp. 27-30.

•Sulaymon A.H, Ali A. M., and Al Naseri S.K., 2009,"Natural Organic Matter from Tigris River Water in Baghdad, Iraq", Desalination, .245, pp.155-168.

•Williams, P. A. and Phillips, G. O. 1998 Gums and Stabilisers for the Food Industry 9 Royal Society of Chemistry, Cambridge UK. Special Publication No. 218.

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