Hi everybody.
I have a problem dealing with now. I need a way for estimation the ozone demand for disinfecting water containing 7.2 ppm Fe and 0.4 ppm Mn, can anybody help me what is the method!?
Thank you in advance :)
Most important consideration is that ozone is short lived but amny times more reactive than chlorine. The standard oxidation-reduction potential andreaction rate of ozone is such that it can readily oxidize iron and manganese in groundwater and in water with low organic content. Groundwater systems that have iron levels above 0.1 milligrams per liter (mg/L) may have iron complaints if ozonation or chlorination is added. Excessive doses of ozone will lead to the formation of permanganate, which gives water a pinkish color. This soluble form of manganese (Mn) corresponds to a theoretical stoichiometry of 2.20 mg O3/mg Mn. Stoichiometry is the determination of the proportions in which chemical elements combine or are produced and the weight relation in a chemical reaction. ..PDF enclosed for further reading..
I agree with Dr Srivastava
Further information:
EPA recommendation:
O3 disinfection time: 1.6 CT Mg- minute/L
Retention time: 4 minute
Concentration: 4 Mg/l
Typical residual O3: 0.3-0.9 Mg/l
O3 addition: 1-5 Mg/l
measurement procedure:
1-Spectrophotometere absorption by wave length 22.5 micro metere
2-Titration by free Iodine, Naso3, etc.
Good luck
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