دانلود رایگان مقاله لاتین مدل سازی جذب سزیم به خاک رس از سایت الزویر
عنوان فارسی مقاله:
تحقیقات تجربی و مدل سازی جذب سطحی سزیم و استرانسیم به خاک رس از دفع زباله های رادیواکتیو
عنوان انگلیسی مقاله:
Experimental and modeling investigations of cesium and strontium adsorption onto clay of radioactive waste disposal
سال انتشار : 2016
برای دانلود رایگان مقاله مدل سازی جذب سزیم به خاک رس اینجا کلیک نمایید.
مقدمه انگلیسی مقاله:
1. Introduction
The generated radioactive waste can be divided into liquid, solid and gaseous wastes. Aqueous liquid radioactive waste was generated during research reactor operations and in other operations involving the application of radioisotopes (e.g. medicine, research and education). The type of liquid waste produced depends upon the particular operation being conducted and can vary extensively in both chemical and radionuclides content. In a radioactive waste repository, the main protective function provided by natural geological barrier itself, selected in such a way that its impermeability and stability characteristics should prevent contamination to reach to biosphere. On the other hand, due to the negative evolution of the radioactive waste repository over hundreds or thousands of years, the natural or engineered barriers are deteriorated. As a result many scenarios, which could lead to leak of the radioactive such as intrusion of rain or ground water, leaching of waste containers, etc. are suggested (Alves et al., 2015; Abdel Rahman et al., 2009; Abdel Rahman et al., 2007; Abdel Rahman and Zaki, 2011). In this regard, a primary concern is the contamination of groundwater that is considered a very important vector of pollution. Any accidental release of aqueous waste solutions containing both cesium and strontium may pose an environmental health risk to the soil/groundwater system (Tianlik et al., 2016). The fate and transport of individual contaminants into an aqueous phase is largely controlled by the degree of contaminant interaction with the surrounding soil materials. Distribution coefficient (Kd) is a parameter was used to present the ratio of ions adsorbed into solid to ions in liquid phase (Kamel and Navratil, 2002) this parameter can be influenced by concentration of the stable elements in soil/aqueous phase. Clay minerals are important group of minerals because they are among the most common products of chemical weathering of rocks. Clay minerals are important sorbents for radionuclides due to their negative charge, large specific surface area and surface hydroxyl groups. Sorption on clay minerals strongly affects the fate and mobility of radioactive contaminants in the geosphere (Seung and Diwakar, 2012; Zaki et al., 2011). Different clay minerals show different sorption capacities for radionuclides (Deepthi Rani and Sasidhar, 2011). Their high specific surface area allows strong physical and chemical interactions with fluids and dissolved species which are subjected to electrostatic repulsion, sorption or specific cation exchange reactions. These interactions are responsive for the retention in the barrier of leachate componentssuch as dangerous metallic cations (Churchman et al., 2006; Sánchez-Jiménez et al., 2012). Inshas area (Fig. 1a) which is bounded by longitudes 31° 20′ & 31° 40′ E and latitudes 30° 10′ & 30° 25′ N is considered as an important region for the Egyptian Atomic Energy Authority (EAEA). An area of approximately 1 km × 1 km dimensions had been chosen to be exposed to detailed geologic studies. The main purposes of such studies are standing on the lithological succession in the subsurface. The litho-stratigraphy of studied borehole B2 shows a succession of quaternary and tertiary sediments which are arranged from bottom to top (Fig. 1b) into: a) quaternary sediments which is represented by sands, and b) tertiary sediments which are composed of Miocene clays, silty sand, sand, sandstone and calcareous sandstone (Zaki, 2000). The aim of this work is to study the geochemical and chemical feasibility of the clay as a sorptive barrier towards cesium and strontium ions of Inshas radioactive disposal site.
برای دانلود رایگان مقاله مدل سازی جذب سزیم به خاک رس اینجا کلیک نمایید.
کلمات کلیدی:
PDF]Cesium and Strontium Retentions Governed by Aluminosilicate Gel in ... www.mdpi.com/1996-1944/10/4/447/pdf by JG Jang - 2017 Apr 23, 2017 - of alkali-activated cements having relatively high adsorption capacities were compatible with ... the long-term safety of radioactive waste management [2,3]. .... incorporating cesium and strontium into a solidified matrix, an XRD analysis was ..... and 152,154Eu radionuclides from cement–clay matrices. Study of cesium and strontium adsorption on slovak..|INIS - IAEA https://inis.iaea.org/search/search.aspx?orig_q=RN:41109473 by M Galambos - 2010 Bentonite is a natural clay and one of the most promising candidates for use as a buffer material in the geological disposal systems for high-level radioactive waste and spent nuclear fuel. It is intended to isolate metal canisters with highly radioactive waste pro. ... Study of cesium and strontium adsorption on slovak bentonite. [PDF]Sorption of Cesium and Strontium on Savannah River Soils ... www.iaea.org/inis/collection/NCLCollectionStore/_Public/28/075/28075719.pdf by N Hakem - 1997 - Cited by 1 - Related articles This work was supported by the Office of Environmental Management, Office ... The sorption behavior of cesium and strontium on Savannah River Site Soils impregnated with ... impermeable barrier containment of low level radioactive waste at the ... co- precipitation, adsorption or diffusion (Adeleye et al. .... on clay mineral. [PDF]REMOVAL OF STRONTIUM AND CESIUM FROM RADIOACTIVE ... www.iaea.org/inis/collection/NCLCollectionStore/_Public/05/128/5128005.pdf by PS BULL - Related articles removing strontium radioisotopes from radioactive waste solutions. .... adsorption on the hydroxide floe together with co-precipitation of ... clay to the water. Experimental and modeling investigations of cesium and strontium ... https://www.deepdyve.com/.../experimental-and-modeling-investigations-of-cesium-a... Read "Experimental and modeling investigations of cesium and strontium adsorption onto clay of radioactive waste disposal, Applied Clay Science" on ... Experimental and modeling investigations of cesium and strontium ... https://www.infona.pl/.../bwmeta1.element.elsevier-2095155d-1155-3ed6-b2d9-8ce041... by AAM Abdel-Karim - 2016 - Cited by 1 - Related articles Sorption capacity of Cs + and Sr 2+ onto clay sample was increased when initial ... of cesium and strontium adsorption onto clay of radioactive waste disposal.
