Separation and Recovery of Sodium Nitrate From Low-Level Radioactive Liquid Waste by Electrodialysis

2010 ◽  
Author(s):  
Yoshihiro Meguro ◽  
Atsushi Kato ◽  
Yoko Watanabe ◽  
Kuniaki Takahashi
Keyword(s):  
Sodium Nitrate ◽  
Nitrate Solution ◽  
Liquid Waste ◽  
Sodium Ion ◽  
High Concentration ◽  
Radioactive Liquid Waste ◽  
Nitrate Ion ◽  
Low Level ◽  
Sodium Nitrate Solution ◽  
Exchange Membrane

An advanced method, in which electrodialysis separation of sodium nitrate and decomposition of nitrate ion are combined, has been developed to remove nitrate ion from low-level radioactive liquid wastes including nitrate salts of high concentration. In the electrodialysis separation, the sodium nitrate was recovered as nitric acid and sodium hydroxide. When they are reused, it is necessary to reduce the quantity of impurities getting mixed with them from the waste fluid as much as possible. In this study, therefore, a cation exchange membrane with permselectivity for sodium ion and an anion exchange membrane with permselectivity for monovalent anion were employed. Using these membranes sodium and nitrate ions were effectively removed form a sodium nitrate solution of high concentration. And also it was confirmed that sodium ion was successfully separated from cesium and strontium ions and that nitrate ion was separated from sulfate and phosphate ions.

Development of Separation Technique of Sodium Nitrate From Low-Level Radioactive Liquid Waste Using Electrodialysis With Selective Ion-Exchange Membranes

2013 ◽  
Author(s):  
Keita Irisawa ◽  
Akinori Nakagawa ◽  
Takashi Onizawa ◽  
Takafumi Kogawara ◽  
Keiji Hanada ◽  
...  
Keyword(s):  
Sodium Nitrate ◽  
Liquid Waste ◽  
High Concentration ◽  
Radioactive Liquid Waste ◽  
Nitrate Ion ◽  
Advanced Method ◽  
Low Level ◽  
Fundamental Investigation ◽  
Experimental Parameters ◽  
Liquid Wastes

An advanced method, in which electrodialysis separation of sodium nitrate and decomposition of nitrate ion are combined, has been developed to remove nitrate ion from low-level radioactive liquid wastes including nitrate salts of high concentration. An engineering scale apparatus with two electrodialytic devices, in which the sodium and nitrate ions were separately removed by each device, was produced on the basis of the results of fundamental investigation previously reported, and the performance of the apparatus was tested. Both the ions were successfully removed at the same time, though these ions were separately transferred using two electrodialytic devices. And also effect of several experimental parameters such as current and temperature on current efficiency of both the ions of each device was investigated.

Study on the Formation of Lanthanum Phosphate for Highly Efficient Incorporation of Actinides from Radioactive Liquid Waste

1996 ◽  
Vol 465 ◽  
Author(s):  
Michitaka Sasoh ◽  
Shinya Miyamoto ◽  
Masumitu Toyohara ◽  
Mikio Wada
Keyword(s):  
Sodium Nitrate ◽  
Nitrate Solution ◽  
Liquid Waste ◽  
Decontamination Factor ◽  
Precipitation Method ◽  
Radioactive Liquid Waste ◽  
Lanthanum Phosphate ◽  
Ph Range ◽  
Co Precipitation ◽  
Sodium Nitrate Solution

ABSTRACTWe have studied a co-precipitation method to remove actinides from radioactive liquid waste. Lanthanum phosphate was selected as a co-precipitation material because actinides and lanthanides are among the homology series in the periodic table. In this report, the conditions, under which the lanthanum compound is precipitated was looked at, as well as, ways to widen the pH range in which the precipitation occurrs in sodium nitrate solution. The properties of the resulting precipitates were also investigated. Further, we investigated the incorporation ratio of amerícium (decontamination factor), one of the actinides, into the precipitate from sodium nitrate solution. Lanthanum phosphate was found to be more effective compared to ferric compounds as the co-precipitation material to remove amerícium. The incorporation conditions for strontium using lanthanum phosphate were also investigated. The removal of strontium, by this method, was more effective when the pH is above 7.0.

Physico-chemical studies of DL-alanine in aqueous sodium nitrate solution

2015 ◽  
Vol 85 (1) ◽  
pp. 162-167 ◽  
Author(s):  
S. Roy ◽  
K. Mahali ◽  
S. Mondal ◽  
R. P. Mondal ◽  
B. K. Dolui
Keyword(s):  
Sodium Nitrate ◽  
Nitrate Solution ◽  
Aqueous Sodium ◽  
Physico Chemical ◽  
Chemical Studies ◽  
Sodium Nitrate Solution

Pore Solution Chemistry of Simulated Low Level Liquid Waste Incorporated Cement Grouts

1995 ◽  
Vol 412 ◽  
Author(s):  
Sadananda Sahu ◽  
Sidney Diamond
Keyword(s):  
Pore Solution ◽  
Liquid Waste ◽  
Early Period ◽  
Solution Chemistry ◽  
Ion Concentration ◽  
High Concentration ◽  
Chemical Methods ◽  
Low Level ◽  
Gas Condensates ◽  
Cement Grouts

AbstractExpressed pore solutions from simulated low level liquid waste cement grouts cured at room temperature, 50°C and 90°C for various duration were analyzed by standard chemical methods and ion chromatography. The solid portions of the grouts were formulated with portland cement, fly ash, slag, and attapulgite clay in the ratios of 3:3:3:1. Two different solutions simulating off-gas condensates expected from vitrification of Hanford low level tank wastes were made. One is highly alkaline and contains the species Na+, PO43-, NO2-, NO3- and OH-. The other is carbonated and contains the species Na+, PO43-, NO2- NO3- and CO32- In both cases phosphate rapidly disappeared from the pore solution, leaving behind sodium in the form of hydroxide. The carbonates were also removed from the pore solution to form calcium carbonate and possibly calcium monocarboaluminate. These reactions resulted in the increase of hydroxide ion concentration in the early period. Subsequently there was a significant reduction OH- and Na+ ion concentrations. In contrast high concentration of NO2- and NO3- were retained in the pore solution indefinitely.

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