Study on Migration Model of Petroleum Pollutant in Soil

2013 ◽  
Vol 5 (2) ◽  
pp. 661-669
Author(s):  
Yuquan Sang ◽  
Jingtang Zheng ◽  
Xiaolei Ma
Keyword(s):  
Migration Model ◽  
Petroleum Pollutant

scholarly journals The application of137Cs and210Pbexmethods in soil erosion research of Titel loess plateau, Vojvodina, Northern Serbia

2020 ◽  
Vol 12 (1) ◽  
pp. 11-24
Author(s):  
Kristina S. Kalkan ◽  
Sofija Forkapić ◽  
Slobodan B. Marković ◽  
Kristina Bikit ◽  
Milivoj B. Gavrilov ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Loess Plateau ◽  
Alternative Methods ◽  
Delivery Ratio ◽  
Undisturbed Soil ◽  
Migration Model ◽  
Erosion Rates ◽  
Soil Erosion Rates ◽  
Profile Distribution ◽  
And Migration

AbstractSoil erosion is one of the largest global problems of environmental protection and sustainable development, causing serious land degradation and environmental deterioration. The need for fast and accurate soil rate assessment of erosion and deposition favors the application of alternative methods based on the radionuclide measurement technique contrary to long-term conventional methods. In this paper, we used gamma spectrometry measurements of 137Cs and unsupported 210Pbex in order to quantify the erosion on the Titel Loess Plateau near the Tisa (Tisza) River in the Vojvodina province of Serbia. Along the slope of the study area and in the immediate vicinity eight representative soil depth profiles were taken and the radioactivity content in 1 cm thick soil layers was analyzed. Soil erosion rates were estimated according to the profile distribution model and the diffusion and migration model for undisturbed soil. The net soil erosion rates, estimated by 137Cs method range from −2.3 t ha−1 yr−1 to −2.7 t ha−1 yr−1, related to the used conversion model which is comparable to published results of similar studies of soil erosion in the region. Vertical distribution of natural radionuclides in soil profiles was also discussed and compared with the profile distribution of unsupported 210Pbex measurements. The use of diffusion and migration model to convert the results of 210Pbex activities to soil redistribution rates indicates a slightly higher net erosion of −3.7 t ha−1 yr−1 with 98% of the sediment delivery ratio.

scholarly journals A dynamic migration model with uncertainty

1994 ◽  
Vol 18 (3-4) ◽  
pp. 511-538 ◽  
Author(s):  
Mahmoud A. El-Gamal
Keyword(s):  
Migration Model

scholarly journals Transformation of a petroleum pollutant during soil bioremediation experiments

2008 ◽  
Vol 73 (5) ◽  
pp. 577-583 ◽  
Author(s):  
B. Jovancicevic ◽  
M. Antic ◽  
M. Vrvic ◽  
M. Ilic ◽  
M. Novakovic ◽  
...  
Keyword(s):  
Microbial Consortium ◽  
Polluted Soil ◽  
Oil Refinery ◽  
Danube River ◽  
Ex Situ ◽  
Insoluble Residue ◽  
Soil Bioremediation ◽  
Alluvial Formation ◽  
Oil Type ◽  
Petroleum Pollutant

The experiment of ex situ soil bioremediation was performed at the locality of the Oil Refinery in Pancevo (alluvial formation of the Danube River, Serbia) polluted with an oil type pollutant. The experiments of biostimulation, bioventilation and reinoculation of an autochthonous microbial consortium were performed during the six-month period (May-November 2006). The changes in the quantity and composition of the pollutant, or the bioremediation effect, were monitored by analysis of the samples of the polluted soil taken in time spans of two weeks. In this way, from the beginning until the end of the experiment, 12 samples were collected and marked as P1-P12 (Pancevo 1-Pancevo 12). The results obtained showed that more significant changes in the composition of the oil pollutant occurred only during the last phases of the experiment (P8-P12). The activity of microorganisms was reflected in the increase of the quantity of polar oil fractions, mainly fatty acid fractions. In this way, the quantity of total eluate increased, and the quantity of the insoluble residue was reduced to a minimum, whereby the oil pollutant was transformed to a form that could be removed more efficiently and more completely from the soil, as a segment of the environment.

The Impact of the Movement of Labour: Results from a Model of Bilateral Migration Flows

2011 ◽  
Vol 11 (4) ◽  
pp. 1850240 ◽  
Author(s):  
Terrie L. Walmsley ◽  
Alan Winters ◽  
Amer Ahmed
Keyword(s):  
Developing Economies ◽  
Migration Model ◽  
Global Migration ◽  
Developed Economies ◽  
Migration Data ◽  
Economics Literature ◽  
Unskilled Labour ◽  
Migration Flows ◽  
The Impact

The economics literature increasingly recognizes the importance of migration. In this paper, a bilateral global migration model is developed to investigate the impact of lifting restrictions on the movement of labour. Quotas on skilled and unskilled labour in the developed economies are increased by 3% of their labour forces, with the additional labour supplied by developing economies. This paper improves upon the previous work of Walmsley and Winters (2005). A critical weakness of the previous work was that it was unable to capture the impacts of specific bilateral migration flows or liberalizations between countries. This paper uses a bilateral global migration model that exploits migration data obtained from Parsons, Skeldon, Winters, and Walmsley (2007) that allow the model to account for bilateral migration flows. The results confirm that restrictions on migration impose significant costs on nearly all countries, with the modest liberalization increasing global GDP by US$ 288 billion. All of the developed (labour importing) economies gain in terms of real incomes. While results differ across the developing (labour exporting) economies, most gain as a result of the higher remittances sent home.

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