خيارات البحث
النتائج 1 - 10 من 14
Ozone treatment of industrial wastewater
1981
Rice, Rip G. | Browning, Myron E.
Influence of the ozonation process on the contents of selected chlorine disinfection by-products precursors | Uticaj procesa ozonizacije na sadržaj prekursora odabranih dezinfekcionih nusprodukata hlora
2011
Molnar, J., Prirodno-matematički fakultet, Novi Sad (Serbia) | Agbaba, J., Prirodno-matematički fakultet, Novi Sad (Serbia) | Dalmacija, B., Prirodno-matematički fakultet, Novi Sad (Serbia) | Rončević, S., Prirodno-matematički fakultet, Novi Sad (Serbia) | Kragulj, M., Prirodno-matematički fakultet, Novi Sad (Serbia) | Rajić, Lj., Prirodno-matematički fakultet, Novi Sad (Serbia) | Watson, M., Prirodno-matematički fakultet, Novi Sad (Serbia) | Leovac, A., Prirodno-matematički fakultet, Novi Sad (Serbia)
This study was performed to investigate the influence of the ozonation process on natural organic matter (NOM) and trihalomethane, haloacetonitrile and chloropicrin precursors in groundwater. The largest reduction in dissolved organic carbon, DOC (up to 25%) and UV 254 values (up to 69%) was achieved using 3 mg O3/mg DOC. Reducing the total organic matter resulted in a reduction of trihalomethanes precursors to 194 micro g/L. On the other hand, when it comes to the precursors of the high priority nitrogenous disinfection by-products, the oxidation of NOM by ozone and the resulting increase in organic matter with a low molecular lead to an increase in the haloacetonitrile precursors compared to the raw water and the formation of chloropicrin precursors.
اظهر المزيد [+] اقل [-]Ozone and chlorine dioxide technology for disinfection of drinking water
1980
Katz, J. (Janet)
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.
اظهر المزيد [+] اقل [-]Comparing the effects of ozonation and the peroxone process on the content of haloacetic acid and haloacetonitrile precursors in water | Poređenje uticaja ozonizacije i perokson procesa na promenu sadržaja prekursora halosirćetnih kiselina i haloacetonitrila u vodi
2012
Molnar, J., Prirodno–matematički fakultet, Novi Sad (Serbia) | Agbaba, J., Prirodno–matematički fakultet, Novi Sad (Serbia) | Dalmacija, B., Prirodno–matematički fakultet, Novi Sad (Serbia) | Tubić, A., Prirodno–matematički fakultet, Novi Sad (Serbia) | Watson, M., Prirodno–matematički fakultet, Novi Sad (Serbia) | Krčmar, D., Prirodno–matematički fakultet, Novi Sad (Serbia) | Rajić, Lj., Prirodno–matematički fakultet, Novi Sad (Serbia)
This paper examines the impact of ozonation (0.4 to 3.0 mg O3/mg DOC) and the Peroxone process – O3:H2O2 (0.4 to 3.0 mg O3/mg DOC; O3:H2O2 = 1:1) on the content of natural organic matter (NOM) in water. It was found that the Peroxone process results in a greater degree of total organic matter content removal (up to 81% UV254), but also oxidises a greater amount of hydrophobic NOM compared to ozonation. Ozonation was more effective for the removal of the specific haloacetic acid (HAA) precursors (29-50% HAAFP), whereas the Peroxone process was more effective in the removal of haloacetonitrile (HAN) precursors (19-43% HANFP).
اظهر المزيد [+] اقل [-]Model investigationss [i.e. investigations] of ejector for dosage of ozone into water | Modelska ispitivanja ejektora za doziranje ozona pri mesanju sa vodom
2009
Batinic, B., Univerzitet u Beogradu, Beograd (Serbia). Gradjevinski fakultet | Prodanovic, D., Univerzitet u Beogradu, Beograd (Serbia). Gradjevinski fakultet | Randelovic, A., Univerzitet u Beogradu, Beograd (Serbia). Gradjevinski fakultet
A series of measurements has been conducted with various combinations of ejector dimensions. Variables were diameter of the nozzle and the distance between the end of the nozzle and the beginning of the pipe. Vacuum head in function of water flow was measured when there was no air flow, and when there was air flow (from a reservoir with constant volume). The results are presented in this paper.
اظهر المزيد [+] اقل [-]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.
اظهر المزيد [+] اقل [-]Effects of combined treatment on changes in natural organic matter content in groundwater | Efekti primene kombinovanog tretmana na promenu sadrzaja prirodnih orgnaskih [i.e. organskih] materija u podzemnoj vodi
2008
Tubic, A. | Agbaba, J. | Dalmacija, B., Prirodno-matematicki fakultet, Novi Sad (Serbia)
Coagulation and flocculation can be efficiency applied in drinkling water treatment, in order to remove natural organic matter (NOM). However, in the experiments presented in this paper, the water used is very rich in NOM, and required investigations of additional processes. In order to increase the efficiency of coagulation and flocculation processes in removing NOM from groundwater, the following processes were investigated: adsorption on powdered activated carbon (5-30 mg PAC/l) and preozonation with applied ozone doses of 1.1-6.3 mg O3/l. The parameters used to evaluated the changes in NOM content during the experiment were: KMnO4 consumption, UV absorbance at 254 nm, pH and turbidity.
اظهر المزيد [+] اقل [-]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.
اظهر المزيد [+] اقل [-]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.
اظهر المزيد [+] اقل [-]