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Use of powdered activated carbon for better removal of natural organic matter from groundwater by coagulation and flocculation
2003
Dalmacija, B. (Prirodno-matematicki fakultet, Novi Sad (Serbia and Montenegro). Departman za hemiju) | Klasnja, M. | Agbaba, J. | Ivancev-Tumbas, I. | Becelic, M.
The process of removal of natural organic matter from groundwater by adsorption on powdered activated carbon, coagulation and flocculation was investigated. It was found that the combination of these processes yielded a decrease of KMnO4 values, which allowed the reduction of the coagulant concentration, needed to achieve the necessary quality of drinking water, up to 50%. Also, it was established that the sequence of adding powdered activated carbon and coagulant is one of the essential factors determining the efficiency of NOM removal from water, and which is primarily conditioned by the nature of the organic matter present in the investigated water.
Show more [+] Less [-]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.
Show more [+] Less [-]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.
Show more [+] Less [-]Removal of natural organic matter from groundwater by electrocoagulation | Uklanjanje prirodnih organskih materija iz podzemne vode elektrokoagulacijom
2012
Mohora, E., Prirodno–matematički fakultet, Novi Sad (Serbia) | Rončević, S., Prirodno–matematički fakultet, Novi Sad (Serbia) | Dalmacija, B., Prirodno–matematički fakultet, Novi Sad (Serbia) | Watson, M., Prirodno–matematički fakultet, Novi Sad (Serbia) | Agbaba, J., Prirodno–matematički fakultet, Novi Sad (Serbia) | Dalmacija, M., Prirodno–matematički fakultet, Novi Sad (Serbia) | Molnar, J., Prirodno–matematički fakultet, Novi Sad (Serbia)
The paper presents the results of laboratory research and application of continuous electro-coagulation and electro-flotation (ECEF) to remove natural organic matter (NOM) from groundwater in the treatment of drinking water. The highest NOM removal efficiency for current density of 5.78 mA/ cm square according to UV254 absorbance and dissolved organic matter (DOC) was 77% and 71% respectively. The specific energy and aluminum electrode consumption was 2.01 kWh/cubic m, 80 g Al/cubic m, respectively.
Show more [+] Less [-]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.
Show more [+] Less [-]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%.
Show more [+] Less [-]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.
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