Physicochemical Characterization, Chlorination and ... - IJGHC

Physicochemical...Andzi et al.hydroxide of calcium is given by the mixture contained in the becher which has the smallest value ofturbidity.RESULTS AND DISCUSSIONPhysicochemical quality: Table 1 presents the physical characteristics and the composition inorganic matters of analyzed waters. We can observe that waters of Djoué River have a slightly basicpH. This pH value (7.5) is in the standard WHO on waters of drinks 33 . The value of turbidity (15NTU) shows that they are very muddy waters. These results are confirmed by the values of the colourand the concentration of suspension materials (SM). The strong turbidity of these waters is an indirectindicator of the microbiological risk that can possess these waters. The main source of theorganohalogenated compounds formation is via the oxidation of the natural organic matter (NOM) 34 .The conductivity indicates a low mineralization, consolidated by a general mineralization lower than600 mg/LTable-1: Characteristic Parameters of the Physical Aspect and the Organic MatterParameters Units Sample WHO standardpH - 7,5 6,5 - 9,00Temperature °C 20 12 – 30Turbidity NTU 15 5Color mg/L Pt-Co 7,5 15Smell - whithout whithoutFlavour - whithout whithoutAspect - trouble -Redox Potential mV 342,28 -T.D.S (Total dissolved solid) mg/L 9 -Conductivity µs/cm 20 -Résistivity Ωcm 50000 -Suspension materials (S. M) mg/L 13 < 1General mineralization mg/L 32,48 < 600Analysis of the mineral nitrogen (Table 2) shows that Djoué water’s presents a low concentration innitrogen. However, this low concentration can be precursory nitro-halogenated compounds duringchlorination. It has been demonstrated how nitrogen-enriched fractions of organic matter have ahigher propensity to form various N-disinfection by products (N-DBPs), including the haloacetonitrils(HANs) and halonitromethanes (HNMs) 35 . Algae and wastewater are the two most commonly citedsources of dissolved organic nitrogen. These individual DBPs or mixtures of DBPs could represent apotential human health risk 36,-41 .Table-2: Characteristic Parameters of the Mineral NitrogenParameters Units Sample WHO standardNH 4+NO 2-NO 3-mg/L 0,27 0,5mg/L 0,092 0,1mg/L 0,23 50621 IJGHC; June – August 2013, Vol.2, No.3, 618-630.