The Influence of Chemical Composition of Liquid Radioactive Waste on the Evaporation Process

2000 ◽  
Vol 663 ◽  
Author(s):  
P.P. Poluektov ◽  
L.P. Soukhanov ◽  
M.I. Zhicharev
Keyword(s):  
Chemical Composition ◽  
Radioactive Waste ◽  
Liquid Radioactive Waste ◽  
Evaporation Process

The Influence of Chemical Composition of Liquid Radioactive Waste on the Evaporation Process

2000 ◽  
Vol 663 ◽  
Author(s):  
P.P. Poluektov ◽  
L.P. Soukhanov ◽  
M.I. Zhicharev
Keyword(s):  
Nitric Acid ◽  
Chemical Composition ◽  
Radioactive Waste ◽  
Nuclear Power ◽  
Power Plants ◽  
Liquid Radioactive Waste ◽  
Salt Content ◽  
Evaporation Process ◽  
Simplified Models ◽  
Salt Systems

ABSTRACTA method is suggested to assess the tolerable salt content of the evaporator bottoms from the data on solubility in salt systems taken as simplified models of liquid radioactive waste (LRW) arising from nuclear power plants (NPP) with boiling reactors. It has been demonstrated that the degree of evaporation may be substantially increased by implementing the process in nitric acid. Equations have been derived that allow the calculation of the minimum needed acidity of the solution to allow maximum evaporation.

scholarly journals ЭКОЛОГИЧЕСКИЕ ПРОБЛЕМЫ АРКТИЧЕСКОГО ПОБЕРЕЖЬЯ И ТИТАНО-СИЛИКАТЫ КОЛЬСКИХ ХИБИН: ОТ БИОНИКИ К ГЕОНИКЕ

2020 ◽  
Vol 11 (4) ◽  
pp. 1
Author(s):  
С.В. Кривовичев ◽  
А.И. Николаев ◽  
В.Н. Яковенчук ◽  
Ю.Г. Покровский ◽  
Л.П. Чурилов ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Radioactive Waste ◽  
Chemical Elements ◽  
Complete Solution ◽  
Liquid Radioactive Waste ◽  
The Arctic ◽  
One Stage ◽  
Natural Minerals ◽  
Arctic Coast

The ongoing program of cleansing the Arctic Coast of Russia from liquid radioactive waste (LRW) accumulated in the course of nuclear fleet operation faces the problem of deactivation of huge amounts of routine LRW as well as small and medium volumes of LW, for which there are no technological regulations concerning their processing. Currently, there are no technological processes for a comprehensive one-stage treatment of LRW in a way providing for the possibility of further long-term disposal of treatment products. Our studies have shown that a new nanocrystalline sorbent LHT-9 (layered hydrazin titanate) is capable of removing more than 50 chemical elements from aqueous solutions, including most radionuclides, namely 137Cs, 90Sr, 93Zr, 151Sm, 154Eu, 99Tc, 79Se, 107Pd, 126Sn, 238U, 235U, 239Pu, 237Np, and 243Am, and thus may be successfully used for LRW treatment. Rapid one-stage purification of routine LRW produced by water-water energetic type reactors from radionuclides, such as Cs, Sr and Co, can be achieved using another new sorbent, i.e. ivanyukite mineral (microporous sodium titanosilicate), wich is selective for these elements. Simultaneous or successive use of the newly developed sorbents, with account for their stability in solutions of any grade of acidity or alkalinity, provides for the complete solution of the problem of decontamination and curing of LRW of almost any chemical composition. A new term “geonics” is suggested, by analogy to bionics, to designate technological reproduction and use of unique properties of natural minerals.

Process Design of Heat Pump Evaporation Technology for Liquid Radioactive Waste Treatment

2017 ◽  
Author(s):  
Jia Lu ◽  
Yan Zhou
Keyword(s):  
Radioactive Waste ◽  
Heat Pump ◽  
Waste Treatment ◽  
Natural Circulation ◽  
Liquid Radioactive Waste ◽  
Evaporation Process ◽  
High Concentration ◽  
Separation Function ◽  
Forced Circulation ◽  
Circulation Evaporator

The Site Radwaste Treatment Facility (SRTF) was to treat the liquid radioactive waste with high concentration of electrolytes in CAP1400 plant. Unlike the forced-circulation or natural-circulation evaporator, the waste was purified by evaporation process using heat pump principle in SRTF. This process combined the benefits of heat pump technology and the separation function of evaporation. This paper gave a brief description of the complete evaporation process. The main equipments of the process included pre-heater, evaporator, demister, steam compressor, and distillate tank. The whole system and each unit operation in the process were elaborately simulated based on energy balance. The results can be further used for equipments selection and design. Through the whole discussion of the heat pump evaporation process, it showed the heat pump evaporation process has remarkable energy efficiency and great advantages in equipment layout compared to traditional evaporation treatment for liquid radioactive waste.

Simulation of adsorption-coagulation purification of liquid radioactive waste to remove surfactants

2012 ◽  
Vol 85 (1) ◽  
pp. 46-51 ◽  
Author(s):  
M. G. Ivanets ◽  
T. A. Savitskaya ◽  
D. D. Grinshpan ◽  
N. G. Tsygankova ◽  
A. E. Savkin
Keyword(s):  
Radioactive Waste ◽  
Liquid Radioactive Waste

Immobilization of NPP evaporator bottom high salt-bearing liquid radioactive waste into struvite-based phosphate matrices

2021 ◽  
Vol 416 ◽  
pp. 125902
Author(s):  
Oleg A. Kononenko ◽  
Vitaly V. Milyutin ◽  
Vadim I. Makarenkov ◽  
Evgeny A. Kozlitin
Keyword(s):  
Radioactive Waste ◽  
Liquid Radioactive Waste ◽  
High Salt

scholarly journals Influence of Geopolymer Binder Components on Properties of Compounds during Cementation of Boron-Containing Liquid Radioactive Waste

2021 ◽  
Vol 21 (2) ◽  
pp. 71-77
Author(s):  
Yu. G. Fedorenko ◽  
◽  
Yu. A. Olkhovyk ◽  
A. N. Rozko ◽  
G. P. Pavlyshyn ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Liquid Glass ◽  
Potassium Hydroxide ◽  
Linear Equations ◽  
Liquid Radioactive Waste ◽  
Correlation Coefficients ◽  
Component Composition ◽  
Normative Values ◽  
Leaching Rate ◽  
Base Compound

The paper presents an analysis of the experimental results of the use of geopolymer binders for cementing boron-containing liquid radioactive waste (LRW). The dependence of the properties of compounds on the component composition of binders has been studied. The following components are considered: liquid glass with a silicon modulus of 2.9, a mixture of ash of Darnytsya TPP with slag of the Mariupol metallurgical plant in a ratio of 1: 1 and potassium hydroxide. To perform a factor analysis of the effect, the mass of these substances was taken as three factors in the analysis at two levels. For the manufacture of compounds imitation LRW was mixed with zeolite in a ratio of 10:1 at a temperature of about 60 оC. Subsequently, the above components were added to the mixture, the weight of which varied by ±17% relative to the weight of the base compound. To study the properties, samples of different sizes 5×5×5 cm, 1.5×1.5×1.5 cm and rectangular samples with an outer surface from 96 cm2 to 104 cm2 were made. Each property was studied in 8 samples. The obtained results allowed to construct linear equations that quantitatively link the corresponding characteristic of the compound with the composition of the binders. The correlation coefficients between the experimental and the data calculated by the equation are estimated. The average values of the correlation coefficients may indicate that not all factors were taken into account. The obtained regularities show that in the conditions of the experiment slag and ash increase, and liquid glass and potassium hydroxide reduce the rate of setting of the samples. The density of the samples is increased by ash and slag, while liquid glass and potassium hydroxide are reduced. The compressive strength of liquid glass and potassium hydroxide is reduced, while the mixture of ash and slag is increased. The leaching rate Сs of liquid glass and potassium hydroxide is increased, the mixture of ash and slag is reduced. At the same time, the leaching rate of Sr increases the ash/slag mixture, while liquid glass and potassium hydroxide decrease. The time during which the leaching of Cs reaches the normative values, slag and ash are reduced, and liquid glass and potassium hydroxide are lengthened. The obtained results can be taken into account when optimizing the composition of geopolymer binders for cementing LRW.

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