The Study of CECE Process for Low-Tritiated Liquid Waste Prior to Experimental Phase

Bornea, Anisia; Zamfirache, Marius; Ana, George; Ştefan, Livia; Balteanu, Ovidiu; Bucur, Ciprian

doi:10.1080/15361055.2020.1712991

Cited by 12 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to carry out experimental research that will lead to the final goalpromoting the technology of concentrating low tritium and deuterium concentration waste, an analysis tool was developeda complex calculation program for simulating the CECE isotopic separation process in a non-steady state regime (Bornea et al, 2020).…”

Section: Mathematical Modelmentioning

confidence: 99%

Calculation Program for the Processing of Low-Concentrated Tritium and Deuterium Waste Through the Cece Isotopic Separation Process

Bornea

Icsi

Zamfirache

2021

Smart Energ Sustain Env

View full text Add to dashboard Cite

Within the research conducted at our Institute of Cryogenic and Isotopic Technologies (ICSI), is developed a project entitled "Innovative CECE process solution to promote a new technology for decontamination of liquid waste, tritium low concentrated and deuterium recovery”. The main objective of the project carried out within our team is to promote an innovative solution of CECE isotopic separation process (Combined Electrolysis and Catalytic Exchange), part of a new technology for decontamination of liquid waste, poorly concentrated in tritium, generated by nuclear reactors, ensuring increased recovery of the isotope deuterium and tritium. This paper presents the current stage of an innovative CECE isotopic separation process solution, and also the mathematical model developed for the simulation of hydrogen isotope separation processes through the CECE process and a theoretical analysis based on numerical data resulting from the simulation of two CECE plant operating mode.

show abstract

Section: Mathematical Modelmentioning

confidence: 99%

Calculation Program for the Processing of Low-Concentrated Tritium and Deuterium Waste Through the Cece Isotopic Separation Process

Bornea

Icsi

Zamfirache

2021

Smart Energ Sustain Env

View full text Add to dashboard Cite

show abstract

“…Previous experimental work on graphene for separating hydrogen isotopes was carried out under an electrochemical environment by hydrogen pumping; however, water electrolysis (WE) is a more mature electrochemical separation technology with some industrial application scenarios, such as heavy water detritiation − and tritium enrichment. − It is appealing to apply this atomical sieve membrane to the WE system to boost separation efficiency. Traditional alkaline water electrolysis (AWE) technology using a diaphragm separator transfers the hydroxyl ion, which is incompatible with current proton-conducting graphene sieving membranes, whereas proton exchange membrane water electrolysis (PEMWE) has a high degree of compatibility.…”

Section: Introductionmentioning

confidence: 99%

High Hydrogen Isotope Separation Efficiency: Graphene or Catalyst?

Chu

Zhang

Wei

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Single-layer graphene has been demonstrated to be a high-efficiency hydrogen isotope sieving membrane in the electrochemical hydrogen pumping system. In this work, we transferred this membrane to proton exchange membrane water electrolysis (PEMWE), which has wide industrial applications. Two membrane electrode assemblies with decorated Pt and ink-coated Pt were investigated. The graphene with the decorated Pt scheme acquired the reported highest proton-to-tritium separation factor of 19.50 in PEMWE. However, rather than graphene, the decorated catalyst was demonstrated to be responsible for this remarkable separation efficiency. Previous studies from Geim’s group underestimated the enhanced separation efficiency of decorated Pt over ink-coated Pt, resulting in an exaggerated separation efficiency for graphene. The behavior of proton transfer with hydrogen isotope separation through graphene was interpreted by a serial-parallel circuit model, which suggested that hydrogen isotope separation occurs at defect sites. The limited separation efficiency for graphene was also well understood by a density functional theory (DFT) calculation using an SW 55-77 model and the transition state theory for the kinetic isotope effect. This research provides a thorough understanding of proton transfer with hydrogen isotope separation through graphene.

show abstract

“…In each of the experiments, different operating parameters of the experimental installation were used. Because the isotopic exchange column was designed high enough to ensure complete decontamination of the gas produced in the electrolyser (Bornea et al, 2020), theoretically, the experiments did not affect the PESTD atmospheric releases.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Experimental Pilot for Tritium and Deuterium Separation Activity on Tritium Level in the Atmospheric Water Vapor of Icsi Tritium Laboratory

Făurescu

Bogdan

Varlam

et al. 2022

Smart Energ Sustain Env

View full text Add to dashboard Cite

Results obtained from the monitoring of the ambient air of the ICSI Ramnicu Valcea Tritium Laboratory and the monitoring of the atmosphere around the Experimental Pilot Plant for Tritium and Deuterium Separation are used in the environmental impact evaluation of the experiments in the period 2020-2022. Even though the experiments carried out involved different tritium activity concentrations, there were no increases in the activity of tritium concentration in the analyzed samples, with numerous results of atmospheric samples being below the detection limit.

show abstract

The Study of CECE Process for Low-Tritiated Liquid Waste Prior to Experimental Phase

Cited by 12 publications

References 5 publications

Calculation Program for the Processing of Low-Concentrated Tritium and Deuterium Waste Through the Cece Isotopic Separation Process

Calculation Program for the Processing of Low-Concentrated Tritium and Deuterium Waste Through the Cece Isotopic Separation Process

High Hydrogen Isotope Separation Efficiency: Graphene or Catalyst?

The Impact of Experimental Pilot for Tritium and Deuterium Separation Activity on Tritium Level in the Atmospheric Water Vapor of Icsi Tritium Laboratory

Contact Info

Product

Resources

About