Vol 3 (1) 2011 - UBM :: Departamentul de Chimie-Biologie

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E. Cical, M. Mecea, Gh. Vâtcă, C. Mihali, N. Duţeanu, Studies on obtaining of drinking water quality in a drinking water treatment plant Nitrates,mg/L 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 1 3 5 7 9 1113151719212325272931 day Nitrites 0.0025 0.002 0.0015 0.001 0.0005 0 1 3 5 7 9 1113151719212325272931 day Nitrates Nitrites Figure 7. Nitrates dependence versus days Figure 8. Nitrites dependence versus days From the experimental data can be observed that all the studied parameters are under the maximum concentration admitted by the water quality legislation (aluminium- CMA = 0.2 mg/L, oxidability-CMA = 5 mg/LO 2 , nitrates-CMA = 50 mg/L, nitrites- CMA = 0.5 mg/L). From the experimental data obtained using the studied treatment technique and applied at the station “Micro plant” allowed the establishment with the help of the Table Curve 2D programme, version 5.01, of the mathematic model equation in the view of the aluminium optimum dose determination versus of the raw water turbidity. The mathematic model equation is: where: a + cX Y = (1) 2 1+ bx + dx a, b, c, d are the coefficients. a = -0.22887454 b = 0.087370296 c = 1.8861458 d = -8.51725e -0.5 4. Conclusions In the frame of the presented paper was studied comparative two treatment techniques of water applied at the station “Micro plant”, treatment technique with 5 aluminium sulphate and calcium hydroxide and aluminium base poly chlorine and calcium hydroxide. Enhanced techniques were studied during one month. The water treatment technique with aluminium sulphate and calcium hydroxide does not present efficiency in the water treatment process because the insufficient time for the proceeding of the coagulation optimum conditions. The turbidity of the obtained treated water in the studied technological flux are not in accordance with the legislation requirements, in conclusion the obtained water can not be drinkable. The water treatment technique with aluminium base poly chlorine and calcium hydroxide is optimal and present efficiency on the coagulation process of the suspension from water. The obtained experimental values for the treated water for the turbidity, oxidability, residual aluminium, nitrates and nitrites are in accordance with the legislation requirements. Aluminium bases poly chlorines used in the water treatment present the advantage that react very quickly with the water, assure a good removal of the organic maters from water only by coagulation, determine a small value of residual aluminium in the treated water and correspond to the European requirements. On installation can be dosed also diluted.
Carpathian Journal of Food Science and Technology 2011, 3(1), 1-6 The water treatment technique present the advantage that can be applied practical on a small automated installation, this being the major reason of this effectuated study. The original contribution of the made study allowed the applying in practice of the treatment optimum technique at the station “Micro plant” managed by the SC Vital SA Baia Mare. The obtained drinking water is discharged in present to the inhabitants from the Ferneziu district of the city and is always in accordance with the legislation requirements. 5. References 1. Cical, E., Oprea, G., Mihali, C., Ardelean, L., Burtica, G., Lupa, L. (2008). Systematic studies regarding the introduction of a new product in the flow drinking water an atipical surface source. Revista de Chimie, 59(9),1030-1036. 2. Faust, S.D., Osman, M. Aly, (1998). Chemistry of water treatment. 2 nd Edition, Stonenham, MA: Butterworth Publishers. 3. Jiang, J.Q., Graham, N.J.D., (1997). Pre-polymerised Inorganic Coagulants Used for Water and Wastewater Treatment. Chem$Ind.10 4. Argaman, Y.A., (1971). Pilot-plant studies of flocculation. JAWWA, 63 (12), 775-777. 5. Thomas, D.N., Judd, S.J. and Fawcett, N., (1999). Flocculation modeling: a review. Water Res., 33(7),1579-1592. 6. Wang, X.C., Jin, P.K. and Gregory, J., (2002). Structure of Al-humic flocs and their removal at slightly acidic and neutral pH. Water Supply, 2(2), 99-106. 6
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