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FIRST PAGE ECOTERRA NUMBER 16(3)/2019


Ecoterra, 2019, 16(3):1-5
CURRENT URBAN CO2 CONCENTRATION IN DIFFERENT PLACES IN CLUJ-NAPOCA TOWN
CONCENTRATIA CURENTA A CO2 URBAN IN DIFERITE LOCATII DIN ORASUL CLUJ-NAPOCA

Anamaria Cenan, Daniela Mariana Ciorba
Babeș-Bolyai University, Faculty of Environmental Science and Engineering, Department of Environmental Science, Cluj-Napoca, Romania

CO2 enrichment in the atmosphere through quantification of urban emissions remains a challenge. It is a directly link between urban CO2, CO2 emission in the cities and the urban form, functions, and climate. The current CO2 concentration has been measured in two different important road nodes connected by an important road artery; one located at a higher altitude - Zorilor-Calea Turzii, and the other at low altitude - Cipariu-Calea Turzii. Also, current urban CO2 concentration on different roads in Cluj Napoca town is presented. Following the idea of low carbon city, such relationship has important implication in re-organization of cities, modeling of activities, technologies, setting the direction on certain major road or bypass road. The measurement has happened between June and July 2019.  Additionally the correlation with number and type of motor vehicles was done. With this study we try to create a better understanding on implication of the spatial form in low carbon urban development.


Ecoterra, 2019, 16(3):13-16
MONITORING OF WATER QUALITY IN THE PROCESS OF CLOSURE AND GREENING OF THE URICANI MINE BRANCH
MONITORIZAREA CALITATII APEI IN PROCESUL DE INCHIDERE SI ECOLOGIZARE A MINEI URICANI

Andreea Cristina Tataru
Department of Mechanical and Industrial Engineering and Transports, University of Petrosani, Petrosani, Romania
Aurora Stanci
Departament of Management, Environmental Engineering and Geology, University of Petrosani, Petrosani, Romania

The closure and greening of a mining branch represents an important stage in the life cycle of a mining operation, being by far the most difficult aspect facing the mining industry. Regarding the quality of environmental factors, that sometimes irreparable pollution and degradation of these as a result of mining activities are solid arguments for applying correct standards and policies for ecological restoration. In the process of closure and greening it is compulsory to monitor the environmental factors throughout the entire period of all activities. An important environmental factor is water. In the process of closure and greening, the quality of the domestic and mine waters must be monitored. In this paper we will present the results obtained from the monitoring of the waters from the closure and greening process of the Uricani Mine Branch. It was found that the maximum permissible values according to the authorization are not exceeded for any of the physico-chemical parameters analyzed. The wastewater from the mine without prior purification cannot be discharged into the environment, for them monitoring is required after the branch is closed.


Ecoterra, 2019, 16(3):17-22
NATURAL GAS PIPELINE EXPLOSIONS. CASE STUDY: THE FERăSTRăU-OITUZ ACCIDENT (1984), ROMANIA
EXPLOZII ALE TEVILOR DE GAZE NATURALE. STUDIU DE CAZ: ACCIDENTUL DE LA FERăSTRăU-OITUZ (1984) DIN ROMANIA

Leonid Dumitru Cătăraru
Faculty of Engineering and Management of Technological Systems, University Politehnica of Bucharest, Romania

This paper deals with the analysis of hazards associated with accidental release of high pressure from gas-pipeline transportation system that causes explosions. Natural gas is a naturally gaseous hydrocarbon mixture that is formed under the earth’s surface. Natural gas is perceived as a clean fuel and is relatively environmentally friendly. When burned, it leaves very little hydrocarbon residue when compared to other types of fuels. The primary constituent of natural gas is methane, it may also contain C2+ hydrocarbons, N2, CO2, He, H2S, and noble gases. Different gas processing technologies can be employed to remove constituents other than methane. Due to importance of natural gas as a fuel and the increasing global demand of it, this article reviews a detailed analysis of the natural gas transportation accident in 1984 at Ferăstrău-Oituz, Bacău County, Romania. Based on reports found in the Archive Natural History Museum of Mediaș, a scenario was considered and the physical effects of the explosion were determined.


Ecoterra, 2019, 16(3):23-32
GREEN TECHNOLOGIES FOR REMEDIATION OF CONTAMINED SOILS WITH HEAVY METALS IN THE FORMER GOLD MINING AREAS
TEHNOLOGII VERZI PENTRU REMEDIEREA SOLURILOR CONTAMINATE CU METALE GRELE IN ARIILE UNOR FOSTE MINE DE AUR

Adriana Mihaela Chirilă Băbău, Valer Micle, Ioana Monica Sur
Department of Environmental Engineering and Sustainable Development Entrepreneurship, Faculty of Materials and Environmental Engineering, Technical University of Cluj-Napoca, Cluj-Napoca, Romania
Attila Racoczi
Szent Istvan University, Faculty of Agricultural and Economic Science, Szarvas, Hungary

Soil pollution with heavy metals is one of the most discussed global environmental problems. Due to the performed activities in the past, in gold mining area, resulted in the environment several sources of pollution such as: mine galleries, tailing ponds, dumps of steril and leakages of mine, which are very dangerous for environment because these are loaded with large amounts of heavy metals. Soil pollution with heavy metals represents a negative impact on the environment and human health. For this reason it is necessary to develop friendly technologies, efficient and with a low cost. At present, in order to remedy the polluted soils with heavy metals, the technologies of interest are biotechnologies. The experiment aimed to determine the effect of the variation in concentration of copper on the germination and growth of seeds of Zea mays. After 7 days the seed germination rate was high for the low concentration or control sollution and decreased dramatically with the increase in concentration. Applying the phytoremediation technology with Agrostis capillaris on the tailings pond had a positive effect which has been quantified by the slight decrease in the concentration of metals in the soil into plants. The experimental results obtained on application of the bioleaching treatment on a contaminated soil with heavy metals by using two extraction solutions (water and 9K medium) have shown that in optimal treatment conditions, zinc can be extracted with a yield of 34-86% and copper with a yield of 52-92%. These studies presents some of the green technologies which can be applied in the former gold mining area.


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