细化搜索
结果 11-20 的 91
Sustainable usage of forest ecosystems in Serbia [Serbia&Montenegro] from aspects of water supply and erosion control
2003
Ristic, R. | Djekovic, V. | Letic, Lj. (Sumarski fakultet Univerziteta u Beogradu, Beograd (Serbia and Montenegro))
Forest ecosystems are important component of environment and row basis for wood processing industry. Traditional attitude about primate of productive functions in relation to useful functions, is under question, due to next reasons: exhaustion of sources of wood mass; affirmation of protective and regulative functions in domains of water-supply and erosion control. This attitide os represented in basic plan documents in Serbia, as well as in European Union. Protection, care of existing, and restoration of degraded forests, are the possibilities for development of high-profitable activities such as: recreation and sport tourism, hunting tourism and healthy food production.
显示更多 [+] 显示较少 [-]Biological denitrification in drinking water treatment
2003
Ljubisavljevic, D. | Dakovic, S. (Univerzitet u Beogradu, Beograd (Serbia and Montenegro). Gradjevinski fakultet)
According to existing national Standard for drinking water quality NO3 sup(-) ion is limited to 50 mg/l. Removal of NO3 sup(-) concentration greater than this limit is necessary. One of the possible methods is biological denitrification with CH3OH. Principals of this method are described in this paper with recommendation for construction of pilot plan on the specific groundwater source.
显示更多 [+] 显示较少 [-]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.
显示更多 [+] 显示较少 [-]Quality parameters of canal sediments
2003
Savic, R. (Poljoprivredni fakultet, Novi Sad (Serbia and Montenegro). Departman za uredjenje voda) | Belic, A. | Pantelic, S. | Bozinovic, M.
Importance of sediments quantity and quality problems addressing to land reclamation canal network in Vojvodina (Serbia, Serbia&Montenegro) are pointed out in this paper. Necessity for sediments monitoring and criteria definition for environmental discharge are drown. Special attention is paid to agricultural land as recipient of these sediments.
显示更多 [+] 显示较少 [-]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.
显示更多 [+] 显示较少 [-]Influence of underwater coal pit Kovin on prospective water source Kovin-Dubovac [Serbia, Serbia&Montenegro]
2003
Pusic, M. (Rudarsko-geoloski fakultet, Beograd (Serbia and Montenegro)) | Djuric, D. (Institut za vodoprivredu "Jaroslav Cerni", Beograd (Serbia and Montenegro))
According to Water Plan of the Republic of Serbia the area between Kovin and Dubovac was marked as a possible place for water source for regional water supply of towns and industry of South Backa Region (Serbia). Commencement of underwater coal exploitation was at the beginning of 1990's in the Danube riparian zone near Dubovacka Ada. Potential influence of long-term underwater coal exploitation from "Kovin" trial coal pit on Dubovacka Ada on quality and quantity of groundwater that will be extracted from regional water source is analysed in this article.
显示更多 [+] 显示较少 [-]Reasons for rapid water quality degradation on Kljuc 1 water source [Serbia, Serbia&Montenegro]
2003
Radenkovic, Z. | Borelli-Zdravkovic, Dj. (Institut za vodoprivredu "Jaroslav Cerni", Beograd (Serbia and Montenegro))
The town Pozarevac water supply is endangered due to groundwater quality degradation on the only remaining water source Kljuc 1. Nitrate content presents critical parameter (MCL in potable water is 50 mg NO3/l) with values in cumulative samples up to 40-45 mg NO3/l, locally up to 70-100 mg NO3/l. Rapid water quality degradation on water source in the last few years is a consequence of the surrounding activities which have influenced on quality deterioration, excessive groundwater extraction, off-line of water source Meminac, unfavourable hydrologic conditions etc.
显示更多 [+] 显示较少 [-]Water protection in the Visocica catchment area through concept of agroforestry [Serbia, Serbia&Montenegro]
2003
Ristic, R. | Kadovic, R. | Djekovic, V. | Letic, Lj. | Nikic, Z. (Univerzitet u Beogradu, Beograd (Serbia and Montenegro). Sumarski fakultet)
One of the most important strategic-development directions of Serbia in the 21st century is restoration of hilly-mountainous regions. Stara Planina represents the region with extraordinary natural potentials almost unused, especially the part upstream of the reservoir Zavoj. Development of sheep raising on huge meadow-pasture surfaces in the catchment of river Visocica is possible, taking into account natural characteristics of the area, education and tradition of inhabitants. Catchment area of river Visocica provides water for water-supply reservoir Zavoj, so it is very important to apply erosion control measures on the slopes, as well as stopping the eroded material and pollutants before reaching the water courses. Agroforestry is optimal system of land use, with indispensable conservation and protective measures.
显示更多 [+] 显示较少 [-]Nitrate[s] in alluvial waters in the vinicity of groundwater source "Kljuc 1" [of the town of Pozarevac [Serbia, Serbia&Montenegro]]
2003
Boreli-Zdravkovic, Dj. | Radenkovic, Z. (Institut za vodoprivredu "Jaroslav Cerni", Beograd (Serbia and Montenegro))
Concentrations of nitrate above defined levels for portable water are present in most of the groundwater sources in Velika Morava river alluvion. Some problems exists in Meminac and Kljuc, groundwater sources of Pozarevac town. Some detail investigations were organized in 2002. Survey of groundwater quality in the wide surrounding of Kljuc confirmed some earlier made assumptions about influence of agriculture and sewage water, and their contribution to existing groundwater quality.
显示更多 [+] 显示较少 [-]Estimation of the phytoplankton quantity in the area of the Montenegrin coastal sea as a consequence of eutrophication
2003
Vuksanovic, N. (Institut za biologiju mora, Kotor (Serbia and Montenegro))
Investigations of phytoplankton were done in the shallow Montenegrin coastal sea during the period from June to December, 2002. These investigations were the continuation from the preceding years. The main intention was to establish the impact of eutrophication to the quantity and composition of phytoplankton i.e. to establish the difference between areas in the bay and outside the bay. Like is previous years, the highest quantities of phytoplankton - microphytoplankton above all, were found in the area of the Boka Kotorska Bay (in Kotor Bay), Montenegro (Serbia&Montenegro). In July, 2.1 x 10**6 cells/cubic dm were found with dominant species Leptocylindrus minimus represented with 1.4 x 10**6 cells/cubic dm. In the area outside the Bay of Boka Kotorska, exposed to the impact of the open sea, values were significantly lower. In front of Budva, maximum was 1.7 x 10**5 cells/cubic dm in July. At locality exposed to the influence of the river Bojana (brackish water), similar values were established, except in October when 1.1 x 10**6 cells/cubic dm were found.
显示更多 [+] 显示较少 [-]