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Formation of ozonation byproducts in the groundwater subjected to preozonation and coagulation
2005
Agbaba, J.(Prirodno-matematicki fakultet, Novi Sad (Serbia and Montenegro)) E-mail:agbabaj@ih.ns.ac.yu | Dalmacija, B. | Klasnja, M. | Ivancev-Tumbas, I.
The work considers the effect of the ozonization process on the change of contents of natural organic matter (NOM) and formation of byproducts in the groundwater pretreated by preozonation (2.0 g O3/cubic m) and coagulation with polyaluminium-chlorosulfate (5 and 10 g Al/cubuc m). Experiments were carried out on a semi-industrial plant of capacity of 2 cubic m/h, using groundwater with a high content of NOM (5.1 mg/l TOC). It was found that in the course of ozonization NOM content shows a decrease (18-64%), as well as the potential of formation of trihalomethanes, PFTHM (12-59%), whereas content of aldehydes increases by 3.0-7.7 microgram/l, depending on the water pretreatment and applied ozone dose. It was found correlation between specific aldehyde content and decrease of the specific PFTHM (r=0.815-0.998).
Show more [+] Less [-]Removal of phenol from water by direct ozonization
2005
Ostojic, D.R.(Univerzitet u Beogradu, Beograd (Serbia and Montenegro). Hemijski fakultet) | bradovic, B.M. | Manojlovic, D. E-mail:manojlo@chem.bg.ac.yu | Kuraica, M.M. | Krsmanovic, V.D. | Puric, J.
New type of ozone generator based on barrier discharge was applied for removal of phenol from water under laboratory conditions. Three water samples with initial concentration of phenol of 6.0 mg/L were studied. In the experiment with distilled water containing phenol, 98.9% of phenol was removed (93.3% during the ozonization). Under similar conditions two different water samples from river Danube were used. In these cases, 76.7% and 80.0% of phenol were removed, respectively. In all experiments, water samples containing phenol passed only once through the ozonizer. It is reasonable to assume that better purification could be obtained with several passes of water through ozonizer and/or by optimization of the process (adjusting concentration of ozone, ozonization time, water flow, etc.).
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