Effects of the pre-ozonation and coagulation on natural organic matter and arsenic content in water | Efekti procesa predozonizacije i koagulacije na sadrzaj prirodnih organskih materija i arsena u vodi
2009
Tubic, A. | Agbaba, J. | Dalmacija, B., Prirodno-matematicki fakultet, Novi Sad (Serbia) | Djurin, Z., JKP Vodovod i kanalizacija, Zrenjanin (Serbia) | Roncevic, S. | Maletic, S., Prirodno-matematicki fakultet, Novi Sad (Serbia)
Groundwater from the middle Banat region (Serbia) which is used as a drinking water supply for Zrenjanin town contains a high amount of natural organic matter and a high content of arsenic. In this study a pilot-scale system was used to investigate the influence of different ozone doses (0.4-0.9 mg O3/mg DOC) during a pre-ozonation process on NOM removal by coagulation. Ferric chloride coagulant was chosen at a dose of 100 g/cubic meter, as a traditional coagulant which can also help in arsenic removal. The obtained results indicate that an ozone dose of 0.4 mg O3/mg DOC has the best influence on structural changes of NOM. The coagulation process with ferric chloride as coagulant had a significant influence on the arsenic content of the water, with the measured values in the water after coagulation in all three investigated treatment trains being below 10 microgram/l, which is the standard MCL in Serbian legislation.
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