Removal of Turbidity and Dissolved Organic Carbon with Coagulation and Flocculation Process, the Case Study of Water Treatment System of Saimoon Municipality, Amphor Piboonmangsaharn, Ubon Ratchathani
Abstract
The objective of this research was to study on removal of turbidity and dissolved organic carbon of surface water from Water Treatment System of Saimoon Municipality, Amphor Piboonmangsaharn, Ubon Ratchathani. The coagulants type and concentration, pH and addition of flocculants as anion polymer on the efficiencies of each coagulants were studied. The coagulants were aluminium sulfate (Alum), polyaluminium chloride (PAC) and ferric chloride (FeCl3) were studied. Jar test was used in a coagulation and flocculation process with 100 rpm rapid mixing for 10 minutes, then slower to 30 rpm slow mixing for 20 minutes and settle for 60 minutes. It was found that a using of Alum, PAC and FeCl3 were effected on removal of turbidity and dissolved organic carbon in surface water. The optimum contents were 40 mg/L, 60 mg/L and 20 mg/L, respectively. The initial pH of surface water was effected on characterization of dissolved organic carbon and dissociated products from coagulants. The optimum of initial pH was range from 6 to 8. The using of anion polymer (polyacrylamide) in the range of 0.10-0.60 mg/L was effected on the removal efficiency of turbidity and dissolved organic carbon in a little different. The optimum of anion polymer content was 0.10 mg/L. The expenses of coagulants and flocculants on cost of treatment were calculated. The optimum conditions of surface water treatment was the using of 40-mg/L Alum due to the cost of treatment was lowest (0.1135 baht/m3) and easy to use. Keywords : turbidity, dissolved organic carbon, coagulation and flocculation processReferences
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Yanisa, T., Kunut, P., Tidarat, D. & Jamjira, K. (2018). The Study of Optimal Coagulants for Water
Treatment Process of Metropolitan Waterworks Authority. Burapha Science Journal, 23 (1),
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Zhonglian Y., Baoyu G. & Qinyan Y. (2010). Coagulation performance and residual aluminum
speciation of Al2(SO4)3 and polyaluminum chloride (PAC) in Yellow River water treatment.
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system, Bangkhen Water Treatment Plant, Metropolitan Waterworks Authority. (in Thai).
Gregor, J.E., Nokesm, C. J. & Fenton, E. (1997). Optimising natural organic matter removal from low
turbidity waters by controlled pH adjustment of aluminium coagulation. Institute of
Environmental Science and Research Limited, Christchurch, New Zealand. 2949-2957.
Jia, S.H., Zhun, M., Jianjun, Q., Si, H.S. & Chee-Seng, T. (2015). Inline coagulation–ultrafiltration as the
pretreatment for reverse osmosis brine treatment and recovery. Desalination, 365, 242–249.
Kirsten, N.E. & Gary, W.V. 2003. Effects of raw water conditions on solution-state aluminum
speciation during coagulant dilution. Water Research, 37, 3341–3350.
Kabsch-Korbutowicz, M. 2005. Effect of Al coagulation type on natural organic matter removal
efficiency in coagulation/ultrafiltration process. Desalination, 185, 327-333.
Munsin, T. (1989). Water Engineering Volume 1. Bangkok: Chulapress. (in Thai).
Musikavong, C., Suraphong, W., Tana, F.M. & Prasert, P. (2005). Reduction of organic matter and
trihalomethane formation potential in reclaimed water from treated industrial estate
wastewater by coagulation. Journal of Hazardous Materials B, 127, 48-57.
Ning, W., Zhongguo, Z., Dan, L., Yue, W., Jun, W. & Qunhui, W. 2014. Coagulation behavior of
polyaluminum chloride: Effects of pH and coagulant dosage. Chinese Journal of Chemical
Engineering, 23, 1041–1046.
Ottawa, Ontario. (2006). Trihalomethanes, Guidelines for Canadian Drinking Water Quality: Guideline
Technical Document. Federal-Provincial-Territorial Committee on health and the
Environment, Health Canada.
Ploypailin, R. (2013). Turbidity removal by solid contact clarifier with sludge recirculation. (Master’s
thesis). Chulalongkorn University, Department of Environmental Engineering. (in Thai)
Qin J., Maungm H. O., Kiran A. K., Frans K. & Peter M. 2006. Impact of coagulation pH on enhanced
removal of natural organic matter in treatment of reservoir water. Separation and
Purification Technology, 49, 295-298.
Amornrat, W. (2016). Total hardness removal of groundwater by chemical precipitation process.
SNRU Journal of Science and Technology, 8(2), 216-223.
Yupaporn, A., Teerawan, B. & Nanthaphorn, S. (2011). Improvement of coagulation-flocculation
process for water supply system of Samrong sub district administrative Organization at
Samrong district, Ubon Ratchathani province. (Research report). Ubon Ratchathani Rajabhat
University. (in Thai).
Yanisa, T., Kunut, P., Tidarat, D. & Jamjira, K. (2018). The Study of Optimal Coagulants for Water
Treatment Process of Metropolitan Waterworks Authority. Burapha Science Journal, 23 (1),
207-220.
Zhonglian Y., Baoyu G. & Qinyan Y. (2010). Coagulation performance and residual aluminum
speciation of Al2(SO4)3 and polyaluminum chloride (PAC) in Yellow River water treatment.
Chemical Engineering Journal, 165, 122-132.
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2018-08-17
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