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Maxim V. Zdorovets - One of the best experts on this subject based on the ideXlab platform.
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liquid low level Radioactive Wastes treatment by using hydrophobized track etched membranes
Progress in Nuclear Energy, 2020Co-Authors: Ilya V. Korolkov, Arman B. Yeszhanov, Maxim V. Zdorovets, Olgun Güven, Saule S. Dosmagambetova, D I Shlimas, Zh K Zhatkanbayeva, I S Zhidkov, P V KharkinAbstract:Abstract In this paper, we present the results of liquid low-level Radioactive Wastes (LLLRW) treatment by direct contact membrane distillation (DCMD) using polyethylene terephthalate (PET) track-etched membranes (TeMs). PET TeMs were modified by styrene and triethoxyvinylsilane (TEVS) using UV-induced grafting. Modification led to increase in the contact angle to 99° of PET TeMs (pore size from 150 to 300 nm). Hydrophobic PET TeMs were investigated by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), goniometric analysis, gas permeability test, liquid entry presser (LEP) analysis and scanning electron microscope (SEM). Prepared membranes were tested in treatment of LLLRW by DCMD. The influence of pore size on water flux and rejection degree was studied. Rejection degree was evaluated by conductometry and atomic emission methods. Decontamination factors (evaluated by gamma-ray spectroscopy) for 60Co, 137Cs, and 241Am were found to be 85, 1900 and 5 respectively. In most cases degree of rejection of Cs, Mo, Sr, Sb, Al, Ca, Fe, K, Mg and Na ions were more than 90% and close to 100%. The use of TeMs with a narrow pores size distribution and without tortuous channels allowed us to achieve better purification from Radioactive Wastes in comparison with hollow-fiber membranes.
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Modification of PET ion track membranes for membrane distillation of low-level liquid Radioactive Wastes and salt solutions
Separation and Purification Technology, 2019Co-Authors: Ilya V. Korolkov, Arman B. Yeszhanov, Maxim V. Zdorovets, Yevgeniy G. Gorin, Olgun Güven, Saule S. Dosmagambetova, Nikolai A. Khlebnikov, Konstantin V. Serkov, Marina V. Krasnopyorova, Olga S. MiltsAbstract:Abstract The work concerns the purification of saline solutions and concentration of low-level liquid Radioactive Wastes (LLLRW) produced from nuclear research reactor (WWR-K) by membrane distillation in direct contact configuration (DCMD) using track-etched membranes (TeMs). Poly(ethylene terephthalate (PET) TeMs were hydrophobized by UV-induced grafting of styrene. Modification of PET TeMs (pore sizes from 135 to 268 nm) at optimal conditions led to increasing of contact angle to 104°. Hydrophobic PET TeMs were investigated by XPS, FTIR, SEM, liquid entry pressure (LEP) and goniometric. Prepared membranes were tested in DCMD of saline solutions and LLLRW. The effect of membrane pore diameter, temperature, concentration on fluxes and rejection degree was studied. Salt rejection was evaluated by conductimetry and atomic emission method (for Cs, Mo, Sr, Sb, Al, Ca, Fe, K, Mg and Na). Decontamination factors of radioisotopes (for 60Co, 137Cs, and 241Am) were evaluated by gamma-ray spectroscopy. Salt rejection and decontamination factors were found to depend on pore diameter and conditions of DCMD. In most cases the degree of rejection was between 90 and 100%. Decontamination factor of 137Cs reached to 1727.
P V Kharkin - One of the best experts on this subject based on the ideXlab platform.
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liquid low level Radioactive Wastes treatment by using hydrophobized track etched membranes
Progress in Nuclear Energy, 2020Co-Authors: Ilya V. Korolkov, Arman B. Yeszhanov, Maxim V. Zdorovets, Olgun Güven, Saule S. Dosmagambetova, D I Shlimas, Zh K Zhatkanbayeva, I S Zhidkov, P V KharkinAbstract:Abstract In this paper, we present the results of liquid low-level Radioactive Wastes (LLLRW) treatment by direct contact membrane distillation (DCMD) using polyethylene terephthalate (PET) track-etched membranes (TeMs). PET TeMs were modified by styrene and triethoxyvinylsilane (TEVS) using UV-induced grafting. Modification led to increase in the contact angle to 99° of PET TeMs (pore size from 150 to 300 nm). Hydrophobic PET TeMs were investigated by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), goniometric analysis, gas permeability test, liquid entry presser (LEP) analysis and scanning electron microscope (SEM). Prepared membranes were tested in treatment of LLLRW by DCMD. The influence of pore size on water flux and rejection degree was studied. Rejection degree was evaluated by conductometry and atomic emission methods. Decontamination factors (evaluated by gamma-ray spectroscopy) for 60Co, 137Cs, and 241Am were found to be 85, 1900 and 5 respectively. In most cases degree of rejection of Cs, Mo, Sr, Sb, Al, Ca, Fe, K, Mg and Na ions were more than 90% and close to 100%. The use of TeMs with a narrow pores size distribution and without tortuous channels allowed us to achieve better purification from Radioactive Wastes in comparison with hollow-fiber membranes.
Ilya V. Korolkov - One of the best experts on this subject based on the ideXlab platform.
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liquid low level Radioactive Wastes treatment by using hydrophobized track etched membranes
Progress in Nuclear Energy, 2020Co-Authors: Ilya V. Korolkov, Arman B. Yeszhanov, Maxim V. Zdorovets, Olgun Güven, Saule S. Dosmagambetova, D I Shlimas, Zh K Zhatkanbayeva, I S Zhidkov, P V KharkinAbstract:Abstract In this paper, we present the results of liquid low-level Radioactive Wastes (LLLRW) treatment by direct contact membrane distillation (DCMD) using polyethylene terephthalate (PET) track-etched membranes (TeMs). PET TeMs were modified by styrene and triethoxyvinylsilane (TEVS) using UV-induced grafting. Modification led to increase in the contact angle to 99° of PET TeMs (pore size from 150 to 300 nm). Hydrophobic PET TeMs were investigated by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), goniometric analysis, gas permeability test, liquid entry presser (LEP) analysis and scanning electron microscope (SEM). Prepared membranes were tested in treatment of LLLRW by DCMD. The influence of pore size on water flux and rejection degree was studied. Rejection degree was evaluated by conductometry and atomic emission methods. Decontamination factors (evaluated by gamma-ray spectroscopy) for 60Co, 137Cs, and 241Am were found to be 85, 1900 and 5 respectively. In most cases degree of rejection of Cs, Mo, Sr, Sb, Al, Ca, Fe, K, Mg and Na ions were more than 90% and close to 100%. The use of TeMs with a narrow pores size distribution and without tortuous channels allowed us to achieve better purification from Radioactive Wastes in comparison with hollow-fiber membranes.
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Modification of PET ion track membranes for membrane distillation of low-level liquid Radioactive Wastes and salt solutions
Separation and Purification Technology, 2019Co-Authors: Ilya V. Korolkov, Arman B. Yeszhanov, Maxim V. Zdorovets, Yevgeniy G. Gorin, Olgun Güven, Saule S. Dosmagambetova, Nikolai A. Khlebnikov, Konstantin V. Serkov, Marina V. Krasnopyorova, Olga S. MiltsAbstract:Abstract The work concerns the purification of saline solutions and concentration of low-level liquid Radioactive Wastes (LLLRW) produced from nuclear research reactor (WWR-K) by membrane distillation in direct contact configuration (DCMD) using track-etched membranes (TeMs). Poly(ethylene terephthalate (PET) TeMs were hydrophobized by UV-induced grafting of styrene. Modification of PET TeMs (pore sizes from 135 to 268 nm) at optimal conditions led to increasing of contact angle to 104°. Hydrophobic PET TeMs were investigated by XPS, FTIR, SEM, liquid entry pressure (LEP) and goniometric. Prepared membranes were tested in DCMD of saline solutions and LLLRW. The effect of membrane pore diameter, temperature, concentration on fluxes and rejection degree was studied. Salt rejection was evaluated by conductimetry and atomic emission method (for Cs, Mo, Sr, Sb, Al, Ca, Fe, K, Mg and Na). Decontamination factors of radioisotopes (for 60Co, 137Cs, and 241Am) were evaluated by gamma-ray spectroscopy. Salt rejection and decontamination factors were found to depend on pore diameter and conditions of DCMD. In most cases the degree of rejection was between 90 and 100%. Decontamination factor of 137Cs reached to 1727.
Andrzej G. Chmielewski - One of the best experts on this subject based on the ideXlab platform.
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Membrane processes in nuclear technology-application for liquid Radioactive waste treatment
Separation and Purification Technology, 2001Co-Authors: Grazyna Zakrzewska-trznadel, Marian Harasimowicz, Andrzej G. ChmielewskiAbstract:Membrane methods can be considered as the most energy-saving separation techniques. Separation abilities of membranes allow the elimination of many non-effective and energy consuming methods and their replacement by new, modern technologies, friendly environment friendly. An application of membrane methods for liquid Radioactive Wastes treatment requires solving many problems connected with the proper selection of the membranes, membrane modules and other equipment according local conditions: chemical and radiochemical composition of the effluents treated, their activity and total salinity. The installations working in nuclear industry have to fulfil very strict requirements. They ought to be reliable, constructed from special materials defined by separate regulations. Only small number of manufacturers of membrane devices has for their products the certificates of International Atomic Energy Agency. Reverse osmosis (RO) as a method for liquid waste treatment has been examined at laboratory and pilot plant installations. The experience with the process led to design and construction of the industrial plant, 1 m3 capacity, composed of three RO stages. The plant will be included into the system for liquid Radioactive Wastes purification operating at Institute of Atomic Energy in Swierk near Warsaw, treating the liquid waste from all of Poland. Membrane distillation (MD) can be an alternative for liquid Radioactive waste concentration. On the basis of previous laboratory tests a pilot plant for liquid Radioactive Wastes concentration employing direct contact MD was constructed. Pilot plant experiments showed MD is interesting solution for liquid low-level Radioactive waste treatment. As MD is characterised by high retention, large decontamination factors were obtained in separation of radionuclides, which are present in liquid low-level Radioactive Wastes mainly in an ionic form. The RO and MD plants for liquid low level Radioactive Wastes treatment are presented in the paper and the evaluation of both methods, as well.
Saule S. Dosmagambetova - One of the best experts on this subject based on the ideXlab platform.
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liquid low level Radioactive Wastes treatment by using hydrophobized track etched membranes
Progress in Nuclear Energy, 2020Co-Authors: Ilya V. Korolkov, Arman B. Yeszhanov, Maxim V. Zdorovets, Olgun Güven, Saule S. Dosmagambetova, D I Shlimas, Zh K Zhatkanbayeva, I S Zhidkov, P V KharkinAbstract:Abstract In this paper, we present the results of liquid low-level Radioactive Wastes (LLLRW) treatment by direct contact membrane distillation (DCMD) using polyethylene terephthalate (PET) track-etched membranes (TeMs). PET TeMs were modified by styrene and triethoxyvinylsilane (TEVS) using UV-induced grafting. Modification led to increase in the contact angle to 99° of PET TeMs (pore size from 150 to 300 nm). Hydrophobic PET TeMs were investigated by X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), goniometric analysis, gas permeability test, liquid entry presser (LEP) analysis and scanning electron microscope (SEM). Prepared membranes were tested in treatment of LLLRW by DCMD. The influence of pore size on water flux and rejection degree was studied. Rejection degree was evaluated by conductometry and atomic emission methods. Decontamination factors (evaluated by gamma-ray spectroscopy) for 60Co, 137Cs, and 241Am were found to be 85, 1900 and 5 respectively. In most cases degree of rejection of Cs, Mo, Sr, Sb, Al, Ca, Fe, K, Mg and Na ions were more than 90% and close to 100%. The use of TeMs with a narrow pores size distribution and without tortuous channels allowed us to achieve better purification from Radioactive Wastes in comparison with hollow-fiber membranes.
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Modification of PET ion track membranes for membrane distillation of low-level liquid Radioactive Wastes and salt solutions
Separation and Purification Technology, 2019Co-Authors: Ilya V. Korolkov, Arman B. Yeszhanov, Maxim V. Zdorovets, Yevgeniy G. Gorin, Olgun Güven, Saule S. Dosmagambetova, Nikolai A. Khlebnikov, Konstantin V. Serkov, Marina V. Krasnopyorova, Olga S. MiltsAbstract:Abstract The work concerns the purification of saline solutions and concentration of low-level liquid Radioactive Wastes (LLLRW) produced from nuclear research reactor (WWR-K) by membrane distillation in direct contact configuration (DCMD) using track-etched membranes (TeMs). Poly(ethylene terephthalate (PET) TeMs were hydrophobized by UV-induced grafting of styrene. Modification of PET TeMs (pore sizes from 135 to 268 nm) at optimal conditions led to increasing of contact angle to 104°. Hydrophobic PET TeMs were investigated by XPS, FTIR, SEM, liquid entry pressure (LEP) and goniometric. Prepared membranes were tested in DCMD of saline solutions and LLLRW. The effect of membrane pore diameter, temperature, concentration on fluxes and rejection degree was studied. Salt rejection was evaluated by conductimetry and atomic emission method (for Cs, Mo, Sr, Sb, Al, Ca, Fe, K, Mg and Na). Decontamination factors of radioisotopes (for 60Co, 137Cs, and 241Am) were evaluated by gamma-ray spectroscopy. Salt rejection and decontamination factors were found to depend on pore diameter and conditions of DCMD. In most cases the degree of rejection was between 90 and 100%. Decontamination factor of 137Cs reached to 1727.
