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Aerobic mesophylic bacteria in bottled waters
2007
Knezevic, P.,Prirodno-matematicki fakultet, Novi Sad (Serbia). Departman za biologiju i ekologiju | Petrovic, O.,Prirodno-matematicki fakultet, Novi Sad (Serbia). Departman za biologiju i ekologiju
There was carried out microbiological analysis of five bottled water of manufacturers from Serbia. Bacteriological quality was estimated using important parameter-aerobic mesophylic bacteria. Two nutrient media were used: standard (PCA) and low nutrient R2A. Plates were incubated at two temperatures (37 deg C and 22 deg C) during 24 hours, 48 hours, 3 days and 5 days. Results show that this group of bacteria is very abudant in bottled waters and their number depends on water types and manufacturers. Moreover, water from different bottles of the same manufacturer has different microbiological quality. Used media, temperatures and period of incubation also have influence on results and R2A medium gives higher values of aerobic mesophylic bacteria.
Afficher plus [+] Moins [-]Color removal from raw water in drinking water treatment by coagulation with aluminium sulphate
2007
Ljubisavljevic, D.,Univerzitet u Beogradu, Beograd (Serbia). Gradjevinski fakultet
Removal of colour by coagulation in the drinking water treatment is described. Optimal results are obtained by pH correction. Buffer capacity of raw water is dominant on efficiency and rentability of the process.
Afficher plus [+] Moins [-]Enhanced coagulation and flocculation effects in drinking water treatment by flocculation sludge recirculation
2007
Agbaba, J.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Dalmacija, B.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Tubic, A.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Djurin, Z.,JKP Vodovod i kanalizacija, Zrenjanin (Serbia) | Pusic, I.,JKP Vodovod i kanalizacija, Zrenjanin (Serbia) | Ugarcina, S.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Roncevic, S.,Prirodno-matematicki fakultet, Novi Sad (Serbia)
This work considers the possibility of enhancing the iron (III) chloride coagulation process in natural organic matter removal by flocculation sludge recirculation. The results show that flocculation sludge has the potential to coagulate organic matter, and shows a dependence on the depth in the precipitator (0, 30 or 70 cm). Recirculation of flocculation sludge at a dose of 1.6 g/l (from a depth of 30 cm), results in a reduction of required coagulant by 25%.
Afficher plus [+] Moins [-]Effects of the preozonation process on trihalomethanes and haloacetic acids precursors content in coagulated water
2007
Tubic, A.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Agbaba, J.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Dalmacija, B.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Watson, M.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Maletic, S.,Prirodno-matematicki fakultet, Novi Sad (Serbia) | Djurin, Z.,JKP Vodovod i kanalizacija, Zrenjanin (Serbia) | Pusic, I.,JKP Vodovod i kanalizacija, Zrenjanin (Serbia)
One of the biggest problems in drinking water treatment is the presence of a high natural organic matter (NOM) content in water resources. This paper presents the results of a study which aimed mainly to determine a combined coagulation and preozonization process application for trihalomethanes and haloacetic acids precursors content in ground water rich in natural organic matter.
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