خيارات البحث
النتائج 1501 - 1510 من 1,552
Adsorption technology to remove arsenic from groundwater | Adsorpciona tehnologija za uklanjanje arsena iz podzemnih voda
2012
Petruševski, B., UNESCO-IHE Institute for Water Education, Delft (Netherlands) | Milic-Rafai, Č., JKP Vodovod i kanalizacija, Subotica (Serbia) | Tasić, M., JKP Vodovod i kanalizacija, Subotica (Serbia) | Zlatanović, Lj., UNESCO-IHE Institute for Water Education, Delft (Netherlands) | Slokar, Y., UNESCO-IHE Institute for Water Education, Delft (Netherlands)
In the 21 century drinking water of acceptable quality should be available to every person. Numerous investigations are on-going worldwide around the world, to develop innovative and cost attractive approaches for production of high quality drinking water. To allow application of new treatment technology in practice, pilot testing under field conditions are required. Groundwater used for drinking water productions in the Subotica municipalities (Serbia) contains elevated concentrations of arsenic, iron and ammonia, and therefore provided a good basis for continuation of research of UNESCO-IHE, the Netherlands Institute for Water Education, that has been developing innovative water treatment technologies specifically in the field of groundwater treatment and specifically arsenic removal. Objective of this project presented in this paper were to test under field conditions IHE ADART, the innovative adsorptive arsenic removal technology. The pilot project has demonstrated that in addition to conventional approach based on coagulation and break-point chlorination, there is and alternative treatment approach based on biological ammonia removal and adsorptive removal of arsenic that could be economically and ecologically attractive.
اظهر المزيد [+] اقل [-]Effect of low molecular weight carboxylic acids on degradation of textile dye with UV/H2O2 process | Uticaj nižih karboksilnih kiselina na degradaciju tekstilne boje UV/H2O2 procesom
2012
Velinov, N., Prirodno-matematički fakultet, Niš (Serbia) | Najdanović, S., Prirodno-matematički fakultet, Niš (Serbia) | Mitrović, J., Prirodno-matematički fakultet, Niš (Serbia) | Radović, M., Prirodno-matematički fakultet, Niš (Serbia) | Bojić, D., Prirodno-matematički fakultet, Niš (Serbia) | Bojić, A., Prirodno-matematički fakultet, Niš (Serbia)
This study investigates the effect of low molecular weight carboxylic acid on degradation of textile dye C.I. Reactive Orange 16 (RO16), in function of initial pH, using Ultra Violet light and H2O2. Experiments were performed in photoreactor with UVC lamps in stationary conditions. Results shows that carboxylic acids have inhibitory effect on degradation process of dye. With increasing concentration of dye inhibitory effect grows. Inhibitory effect of acid are higher on pH values of solution higher than pKa acids, because than in solution acids appear almost entirely in the form of anion. The highest inhibitory effect shows formates, smaller propanoates, and the smallest acetates. UV/H2O2 process is very effective for removal of organic pollutants, but the efficiency of this process was significantly lower in the presence of lower carboxylic acids.
اظهر المزيد [+] اقل [-]Assessment pollution loads using simulation models of transport | Procjena tereta zagađenja primjenom simulacijskih modela transporta
2012
Milišić, H., Građevinski fakultet, Sarajevo (Bosnia and Herzegovina) | Kalajdžisalihović, H., Građevinski fakultet, Sarajevo (Bosnia and Herzegovina)
In the case that water quality data or even discharge data are missing, pollution loads were calculated as application of appropriate simulation models of pollution transport. Models can be in different levels complexity. Accuracy of the results depends on the accuracy of measurement data. In this study water quality of River Neretva (prediction of BOD pollution loads) is modeled in section from Mostar to Žitomislić using numerical model MIKE 11. Model is calibrated on the basis of available experimental data. Data of another time series are used for verification of last mentioned. The comparative analysis between measured and simulated data showed that MIKE-11 is able to predict sufficiently accurate BOD and DO loads at the catchment outlet.
اظهر المزيد [+] اقل [-]Regulating ambient pollution when social costs are unknown النص الكامل
2012
Figuieres, Charles | Willinger, Marc
This paper offers a new mechanism in order to Nash-implement a Pareto optimal level of ambient pollution. As usuas in the literature on non point source pollution, the proposed scheme is not conditional on individual emissions, since they are not observable; rather it is conditional on aggregate emission. But the novelty here is that we do not assume the regulator knows the agents'preferences, with which he could identify the target level of aggregate emission. Our mechanism dispenses with this information, yet it achieves Pareto optimality provided that the number of agents involved in the problem is known.
اظهر المزيد [+] اقل [-]Chlordécone aux Antilles : évolution des systèmes de culture et leur incidence sur la dispersion de la pollution النص الكامل
2012
Jannoyer-Lesueur M. | Cattan P. | Monti D. | Saison C. | Voltz M. | Woignier T. | Cabidoche Y.M.
La chlordécone, insecticide organochloré, était utilisée pour lutter contre le charançon du bananier (Cosmopolites sordidus) de 1971 à 1993. La chlordécone est peu mobile et se dégrade à une vitesse très lente, voire nulle dans les sols aérés. Sa persistance est donc longue, et la dépollution artificielle n'est pas opérationnelle actuellement. Cependant les sols restent fertiles même si ils constituent la principale réserve et source de pollution. Il faut donc gérer cette pollution. Cela implique des changements au sein des agrosystèmes, tant sur le choix des productions possibles que sur certaines pratiques agronomiques pour réduire les impacts sanitaires. Pour les espèces cultivées sur les parcelles polluées, certains organes sont très contaminés (tubercules), d'autres indemnes (fruits d'arbres, banane, ananas, tomate, etc.). Un outil de gestion est disponible pour les producteurs afin d'anticiper le choix des cultures et de réduire le risque d'exposition des consommateurs. Réciproquement, les systèmes de culture ont une incidence sur la dispersion de la molécule à l'échelle d'une parcelle et d'un bassin versant. La chlordécone contamine les ressources et les organismes aquatiques via les eaux de percolations issues des parcelles polluées. Cet article fait le point sur les principaux résultats disponibles et les projets en cours sur la gestion des agrosystèmes et les processus de transferts de la chlordécone vers l'environnement ainsi que leurs impacts sur les écosystèmes aquatiques. (Résumé d'auteur)
اظهر المزيد [+] اقل [-]Presence of thermophilic species of echinoderms (Echinodermata) on the continental shelf on Montenegrin coast | Zastupljenost termofilnih vrsta bodljokožaca (Echinodermata) na kontinentalnom šelfu crnogorskog primorja
2012
Petović, S., Institut za biologiju mora, Kotor (Montenegro)
The paper presents the results of diversity and distribution of thermophilic species of echinoderms in the continental shelf on Montenegro coast. The data show that explored area inhabited by eight species of which the sea cucumber Holothuria (Platyperona) sanctori for the first time is recorded and is new species for the fauna of Montenegro. Based on the fact that climate change affects the temperature rise of the sea water, especially the coastal area, the aim of this study was to determine the presence of thermophilic species of echinoderms, which can be the basis for further monitoring and tracking changes in the benthic biocoenosis of the southern Adriatic.
اظهر المزيد [+] اقل [-]Assessment of water quality of Boka Kotorska Bay [Adriatic sea, Montenegro] based on the level of DNA damage in Mytilus galloprovincialis | Procena kvaliteta vode Bokokotorskog zaliva [Jadransko more, Crna Gora] na osnovu nivoa oštećenja molekula DNK kod Mytilus galloprovincialis
2012
Kolarević, S., Biološki fakultet, Beograd (Serbia) | Kračun, M., Institut za biološka istraživanja Siniša Stanković, Beograd (Serbia) | Mitrić, M., Institut za biologiju mora, Kotor (Montenegro) | Marković, S., Institut za biologiju mora, Kotor (Montenegro) | Sunjog, K., Institut za multidisciplinarna istraživanja, Beograd (Serbia) | Knežević-Vukčević, J., Biološki fakultet, Beograd (Serbia) | Gačić, Z., Institut za multidisciplinarna istraživanja, Beograd (Serbia) | Vuković-Gačić, B., Biološki fakultet, Beograd (Serbia) | Kljajić, Z., Institut za biologiju mora, Kotor (Montenegro)
Mediterranean mussels, Mytilus galloprovincialis, are recognized bioindicators used in investigation of genotoxic pollution in the areas under the impact of anthropogenic activities. In July and August 2011 specimens of M. galloprovincialis were collected from 5 sites of Boka Kotorska Bay, Montenegro. Level of DNA damage was measured in gills, haemolymph and digestive gland with alkaline comet assay. Significant increase in DNA damage was detected in tissues of mussels collected from polluted sites comparing with mussels collected from the clean reference site Dobrota. The highest response to pollution was found in gills and digestive gland cells.
اظهر المزيد [+] اقل [-]A review of introduced species in Montenegrian coastal sea | Pregled unešenih vrsta u crnogorskom podmorju
2012
Mačić, V., Institut za biologiju mora, Kotor (Montenegro) | Kljajić, Z., Institut za biologiju mora, Kotor (Montenegro)
Based on all available data a review of introduced non-indigenous species is reported for the area of Montenegrian coastal sea (South-East Adriatic Sea). All together 11 species were recorded, three algae and eight animals. Monitoring of invasive species has been done partially only for Caulerpa racemose var. cylindracea, while for other species distribution and impact on autochthonous environment is unknown.
اظهر المزيد [+] اقل [-]Determination of microelement contents in sea water and mussels from Boka Kotorska Bay, Montenegro | Određivanje sadržaja mikroelemenata u morskoj vodi i dagnji u Bokokotorskom zalivu, Crna Gora
2012
Joksimović, D., Institut za biologiju mora, Kotor (Montenegro) | Kljajić, Z., Institut za biologiju mora, Kotor (Montenegro)
The concentrations of heavy metals (Cu, Zn, Cr, Pb, Cd and As) were measured in sea water and mussels at location in the Boka Kotor Bay which selected as result of increased anthropogenic impacts from land. Sampling was performed at three locations, Sv. Stasije, Herceg Novi and Žanjice in the fall 2006 and spring 2007. The majority of the microelements registered in higher concentrations in fall samples in 2006 than in spring samples 2007. The concentration of metals in the studied samples was present at different levels, and is beloved the maximum level allowed, except for yinc and lead in some locations.
اظهر المزيد [+] اقل [-]Montenegrian coastal sea monitoring | Monitoring obalnog mora Crne Gore
2012
Kljajić, Z., Institut za biologiju mora, Kotor (Montenegro) | Marković, S., Institut za biologiju mora, Kotor (Montenegro) | Žmukić, J., Institut za biologiju mora, Kotor (Montenegro) | Mitrić, M., Institut za biologiju mora, Kotor (Montenegro) | Kasteli, A., Institut za biologiju mora, Kotor (Montenegro) | Pestorić, B., Institut za biologiju mora, Kotor (Montenegro) | Drakulović, D., Institut za biologiju mora, Kotor (Montenegro)
Monitoring of ecological condition of the coastal sea of Montenegro has been carried out extensively since 1963 along with foundation of the Institute of marine Biology in Kotor (Montenegro). Recently, in accordance with recommendations of the Barcelona Convention, the LBS Protocol, the EU Framework Directive for coastal waters and domestic laws, in recent years has been carried out continuous monitoring of quality water, sediments, biota as well as ecological effects of pollution on constant monitoring positions in this southeastern part of the Adriatic. In this paper was given an over view of activities and the plan of long-term continuous monitoring of environmental quality and ecological condition of the coastal sea of Montenegro.
اظهر المزيد [+] اقل [-]