タグ「wastewater」
Author: A. P. Novikov, S. N. Kalmykov, T. A. Goryachenkova, B. F. Myasoedov
Reference: Russian Journal of General Chemistry, 2011
ISSN: 0373-0247
DOI: 10.1134/S1070363211090489
Keywords: radionuclides, change form, contaminated wastewater, soil
Abstract: Radionuclides undergo redistribution and change existence forms (and, therefore, migration dynamics) not only immediately after they enter into the environment, but also during migration. The latter can be associated with changes in the delivery medium (for example, as strongly contaminated wastewaters is diluted by natural), decrease in the concentration of radionuclides (during their sorption and coprecipitation on soil or host rock microparticles), or change in carrier forms (dissolution of fuel matrices). In view of the multifactor nature and complexity of these processes, we set ourselves the task to summarize results obtained at the GEOKHI RAS on the forms of existence and migration dynamics of radionuclides in radioactively contaminated soils. As objects for study we used soils typical of the forest-steppe zone of the Eastern Ural Radioactive Trace (EURT) and taken at a distance of 2 through 8 km from the Trace axis and 2–4 km from the accident place, as well as samples of the high-water bed soils and sediments of the Enisey River, taken 60 km downstream from the Mining Chemical Combine (MCC).
URL: http://link.springer.com/article/10.1134%2FS1070363211090489#
Author: Gerasimova L. G., Maslova M. V., Nikolaev A. I.
Reference: Gazette “ЦВЕТНЫЕ МЕТАЛЛЫ“, 2011
ISSN: 0372-2929
DOI:
Keywords: Sorption, desorption, composite sorbents, flow sheet, wastewater, non-ferrous metal cations, radioactive isotopes
Abstract: A method for the production of a new, composite inorganic adsorbent based on titanium phosphate derived from current wastes of apatite-nepheline ore processing is described. The new variant of waste recovery makes it possible to implement advanced and environmentally friendly patterns. In this work, a scientific justification for parameters of titanium phosphate precursor synthesis and treatment is proposed. The technology is highly effective; the adsorbent can be used in cleaning of weak-salt aqueous effluents. The chemical stability of the composite adsorbent in various solutions has been studied to determine the optimal operating conditions for it. It has been found that after five sorption desorption cycles the material’s ion-exchanges capacity remains practically unchanged. The possibility of recovering the sorbent saturated with transition metals has been examined by using different mineral acids. Methods for the spent material utilization in the production of building fillers are discussed. The paper provides the data on purification of real wastewater of multimineral ore processing. It was noted that the cations of water hardness are first absorbed by the material, later becoming displaced by elements forming stronger bonds with phosphate groups. By the example of artificial radioactive solutions containing 137Cs, 152Eu, 234Th, 238U, 60Со, we determined the material’s ion-exchange capacity and its dependence on the adsorbent’s initial bulk density and number of sorption stages. The material has demonstrated superior ion-exchange properties in wastewater purification from non-ferrous metals and radionuclides.
URL: http://www.rudmet.ru/journal/656/article/8383/
Title: Heterogeneous electrochemical systems for purification of water contaminated with organic complexing agents and radionuclides
Author: Gontar I.A., Kozlov K.B., Lavrov B.A.
Reference: Water: chemistry and ecology (Russian: “ВОДА: ХИМИЯ И ЭКОЛОГИЯ“), 2012
ISSN: 2072-8158
Keywords: conductivity, current flow, organic complexing agents, radioactive waste, resistance, wastewater
Abstract: The possibility of purification of liquid radioactive wastes from water dissolved organically complex agents have been discussed. The process was held in electrochemical reactor, its operation is based on the physicochemical processes accompanying the flow of electric current through the phase boundary leading to the chemical transformation of hazardous compounds into harmless gases and water.
URL: http://watchemec.ru/en/article/24679/
