Institute of Chemistry of the Academy of Sciences of Moldova Larisa Postolachi chemjm_correspondence@yahoo.com mEDRA 20161225

07 10.19261/cjm.2016.11(1).03 http://www.cjm.asm.md/sites/default/files/article_files/ChemJMold201611(1)_27-32_Postolachi.pdf Institute of Chemistry of the Academy of Sciences of Moldova mEDRA 01 Institute of Chemistry of the Academy of Sciences of Moldova MD 07 1857-1727 JB 07 2345-1688 JD 11 1 June 2016 01 201606 3 11 27 32 6 1 A01 Larisa Postolachi Postolachi, Larisa Larisa Postolachi 2 A01 Vasile Rusu Rusu, Vasile Vasile Rusu 3 A01 Tudor Lupascu Lupascu, Tudor Tudor Lupascu 01 eng 20 coagulation; Jar-test; aluminium sulphate; aging 01 Aluminium sulphate is one of the most widely used coagulants for water treatment and has been proven to be an effective coagulant for the removal of certain contaminants, turbidity and colour. Aluminium sulphate used during the coagulation process is hydrolyzed in the water, forming polynuclear complexes. Aged aluminium solutions show different coagulation behaviour than that of freshly prepared solutions. Obtained results reveal that using of optimal aging solution of coagulant improves the coagulation process. 201606 2016 Institute of Chemistry of the Academy of Sciences of Moldova 10.1002/jctb.1300 Gao, B.; Hahn, H.; Hoffmann, E. Evaluation of aluminum-silicate polymer composite as a coagulant for water treatment. Water Research, 2002, 36, pp. 3573–3581 Jiang, J.-Q.; Graham, N. Pre-polymerised inorganic coagulants and phosphorus removal by coagulation - A review. Water SA, 1998, 24(3), pp. 237–244 10.1016/j.colsurfa.2008.10.009 10.1016/j.chemosphere.2004.08.066 10.1016/S0160-4120(98)00073-7 10.1080/09593338909384716 Wu. Z.; Zhang, P.; Zeng, G.; Zhang, M.; Jiang, J. Humic acid removal from water with polyaluminum coagulants: effect of sulfate on aluminum polymerization. Journal of Environmental Engineering, 2012, 138(3), pp. 293–298 Stumm, W.; Morgan, J. Chemical aspects of coagulation. Journal of the American Water Works Association, 1962, 54, pp. 971–992 Children’s health and environment in the Republic of Moldova, Chisinau, 2010. http://www.mediu.gov.md/images/documente/starea_mediului/rapoarte/nationale/p5_raport_parma_en.pdf 10.19261/cjm.2015.10(1).03 Satterfield, Z. Jar Testing. Technical Brief, 2005, 5(1), pp. 1–4 Pask, D. Jar Testing: Getting started on a low budget. On Tap, 1993, 2(2), pp. 4–6 Madera, V.; Allen, H. E.; Minear, R. A., Eds. Examination of Water for Pollution Control, World Health Organization. Pergamon Press: Copenhagen, Denmark, 1982, 1st Ed., vol. 2, pp. 37–42 Stefan, D.; Costache, C.; Ruxandu, V.; Balas, M.; Stefan, M. Comparative study on surface water treatment using aluminum sulphate and polyaluminum chlorides as coagulant reagents. Environmental Engineering and Management Journal, 2009, 8(4), pp. 859–863 Governmental Decision no. 934 of 15 August 2007 regarding the establishment of automated information system “State Register of natural mineral and drinking waters and soft bottled drinks”. Official Journal of the Republic of Moldova, 24.08.2007, no. 131-135 (970). (in Romanian). http://lex.justice.md/viewdoc.php?action=view&view=doc&id=326557&lang=1