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Articles 391 - 392 of 392
Full-Text Articles in Engineering
Ozonation At The Stander Water Reclamation Plant, Johannes Van Leeuwen, J. Prinsloo
Ozonation At The Stander Water Reclamation Plant, Johannes Van Leeuwen, J. Prinsloo
Johannes van Leeuwen
The results achieved by ozonation at the Stander Water Reclamation Plant, Pretoria, are discussed. A packed column together with an injector mixing device gave ozone· utilization levels higher than 95 % at dosages of about 10 mg/ dm3. Redistribution plates in the packing proved necessary to prevent poor adsorption due to backmixing in the gas phase. Disinfection is satisfactory if total oxidant residuals can be maintained at more than 0,2 mg/dm3 for 15 min. The results indicated that ozonation also lowered the chemical oxygen demand and total organic carbon concentration in the water. In spite of the fact that it …
Studies On Disinfection And Chemical Oxidation With Ozone And Chlorine In Water Reclamation, W. R. Ross, Johannes Van Leeuwen, W. O. K. Grabow
Studies On Disinfection And Chemical Oxidation With Ozone And Chlorine In Water Reclamation, W. R. Ross, Johannes Van Leeuwen, W. O. K. Grabow
Johannes van Leeuwen
Laboratory studies showed that Pseudomonas aeruginosa, Aeromonas hydrophila and Acinetobacter anitratum are more resistant to chlorine and ozone than Escherichia coli. Pseudomonas aeruginosa was the most resistant of all strains tested and was selected as test organism for pilot plant studies on the efficiencies of chlorine and ozone disinfection. The disinfectants proved equally efficient for the disinfection of chlorine demand-free water but ozone was much more efficient in the case of water with a chlorine demand. This difference was confirmed to be due to the property of chlorine to react with nitrogenous substances to form chloramines which are less efficient …