Affiner votre recherche
Résultats 1-6 de 6
Effects of preozonation on natural organic matter removal from groundwater by coagulation and flocculation processes
2003
Agbaba, J. (Prirodno-matematicki fakultet, Novi Sad (Serbia and Montenegro). Departman za hemiju) | Dalmacija, B. | Klasnja, M. | Ivancev-Tumbas, I.
The paper deals with pilot-scale investigations of the effect of preozonation on NOM removal from groundwater by coagulation and flocculation processes. It was found that the preozonation increased the efficiency of organic matter removal by coagulation and flocculation from 23.6 to 47.2% as judged on the basis of KMnO4 values. From the aspect of the change of content of trihalomethanes precursors preozonation exhibits both the positive and negative effects if their content in the water after coagulation is considered in dependence of the applied ozone dose. The obtained values siggest the necessity of careful optimization of the processes of preozonation, coagulation, and flocculation, especially from the aspect of the change in content of the precursors of disinfection byproducts.
Afficher plus [+] Moins [-]Formation of ozonation byproducts in groundwater subjected to aeration/preozonation and coagulation
2006
Agbaba, J. (Prirodno-matematicki fakultet, Novi Sad (Serbia)), E-mail: agbaba@ih.ns.ac.yu | Dalmacija, B. (Prirodno-matematicki fakultet, Novi Sad (Serbia)) | Klasnja, M. (Tehnoloski fakultet, Novi Sad (Serbia))
This work considers the effect of the ozonation process on formation of aldehydes in groundwater pretreated by aeration/preozonation (2.0 g O3/cubic meter) and coagulation with polyaluminium-chloride (5 and 10 g Al/cubic meter). Experiments were carried out on a semi-industrial plant of 2 cubic meter/h capacity. It was found that in the course of ozonation NOM content shows a decrease (up to 54% TOC), whereas content of aldehydes increases by 1.0-14 microgram/L, depending on the water pretreatment and applied ozone dose. The most prominent changes in specific aldehydes content during ozonation were detected after applying ozone dosages of 0.5-2.0 mg O3/mg TOC.
Afficher plus [+] Moins [-]Adventage of ozonization in treatment of groundwater
2006
Kaut, I. (Vodovod i kanalizacija, Pancevo (Serbia)), E-mail: kaut@eunet.yu | Savic, Z. (Vodovod i kanalizacija, Pancevo (Serbia))
Treatment of groundwater with increase contents of ammonia, iron and manganese, needs more content of oxigen then realized in proceeding of aeration. Beside enriching water of oxigen, ozonization gives other important effects. For the first time, ozonization is practicaled on plant in Pancevo (Serbia), and it is base for define all of positive experiences. From this, we can recognize priorities of this proceeding, which will be aranged in this report.
Afficher plus [+] Moins [-]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).
Afficher plus [+] Moins [-]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.).
Afficher plus [+] Moins [-]Removal of natural organic matter from water using the ozone-biologically activated carbon system
2004
Agbaba, J.(Prirodno-matematicki fakultet, Novi Sad (Serbia and Montenegro). Departman za hemiju)E-mail:agbaba@neobee.net | Dalmacija, B. | Klasnja, M. | Ivancev-Tumbas, I.
The paper presents the results of a pilot study of the combined process of ozonation and filtration through biologically activated carbon to remove residual organic matter in the process of drinking water production. It was established that the application of these procedures resulted in the removal in average of 74% PB, 50% TOC, 60% of total aldehydes, and 54% PFTHM, the result being a consequence of the adsorption/biosorption processes involved.
Afficher plus [+] Moins [-]