The 12th International Conference on Environmental ... - Events

Abstracts Session 34-36
TcO2(s). For gluconic acid the Tc aqueous concentration starting from TcO4- and reducing the mixture was higher than in systems
with TcO2 as the starting point. This suggests that the pertechnetate was not reduced to TcO2, but an intermediate oxidation state
complex was formed, e.g. Tc(V). <strong>The</strong> conditional stability constant for the Tc(IV)-gluconic acid complex has been determined to
be log = 26.6 ± 0.2.
K) MANAGEMENT OF METAL WASTE WITH HIGH CONCENTRATION OF NATURAL
RADIONUCLIDS, ITS PROBLEMS AND EXPERIENCE - 16222
Alexander B. Gelbutovskiy, JSC “ECOMET-S"(Russia) Peter I.Cheremisin, Alexander V. Troshev, Ecomet-S (Russia)
<strong>The</strong> given work describes the problem and the offered solutions for the NORM contaminated metal waste generated in the oil
& gas and other non-atomic industries. <strong>The</strong> Russian Federation regulatory base, the fundamental metal LLW treatment scheme in
accordance with Sanitary Rules and standards are given. It is shown, that one of the treatment ways is the processing at a specialized
enterprise. Such an only enterprise in Russian Federation is the Joint-Stock Company (JSC) ECOMET-S. Its main activities
are radwaste management, processing and disposal of the metal LLW. <strong>The</strong> operations main goal is to reduce the waste volume to
its minimum before further burial and to return the clean metal to the unrestricted commercial turnover.
<strong>The</strong> worked out technology and the enterprise industrial capacity are represented. JSC ECOMET-Sactivities results and processing
and disposal schedule are given.
L) STUDY OF THE RADIOACTIVE SILT SEDIMENT CEMENTATION TECHNIQUES - 16138
Scientific-Industrial Association Radon (Russia); Elena Zaharova, Vycheslav Ermolaev, IPCE RAS (Russia)
In this paper the following techniques were considered for the silt processing: the cementation of silt without a prior treatment,
cementation of the dried silt product, cementation of the calcined silt product, and the impregnation of the calcined silt with high
penetrating cement grouts.
This paper reports the results of the following studies: the chemical and isotope silt composition, physicochemical silt properties,
properties of the cement grouts and solidified compounds, obtained as a result of various silt processing techniques.
For every processing technique the following cement compound quality index stated in the Russian standard GOST R 51883-
2002 was determined: the mechanical strength, freeze-thaw resistance and leach rate of 137Cs. Effects of variations in the thermal
silt treatment mode, in the water/cement ratio, and in the binder material type have been determined.
Based upon the results of the studies a comparative assessment of the silt cementation techniques has been performed.
M) 5000TH MOSAIK - CASK DELIVERED IN 2007 - A STORY OF SUCCESS - 16216
Olaf Oldiges, GNS Gesellschaft fuer Nuklear (Germany)
Been undertaken to examine the effect of particle size and Reynolds number on particle deposition within the flows, and also
to establish the minimum transport velocity required to re-suspend particles from solid beds. All these findings are of importance
in enhancing our understanding of flows of particles in pipes which in turn is of value in enabling the design of cost effective and
efficient waste treatment processes.
N) CEMENTATION OF PROBLEM LRW USING POROUS CONCRETE - 16139
Andrey Varlakov, Aleksandr Germanov, Aleksandr Barinov,Sergey Dmitriev, Moscow Scientific-Industrial Association
Radon (Russia); Arthur Arustamov, SUE SIA Radon (Russia)
Problem wastes are defined as those wastes which are solidified with difficulty, have poor volumetric efficiencies or produce
an unsatisfactory product, demands much of radiation safety of technological process. <strong>The</strong>se wastes are organic liquid (oil, solvents,
extractants, scintillation cocktail and others), high containing surface-active substances, subacid aqueous saline and high containing
alpha nuclides LRW.
<strong>The</strong> technology consists in as follows. First of all, porous concrete is prepared by a special mixer and placed into a container.
<strong>The</strong> container is the standard drum 100 or 200 l. At the age-hardening of concrete not less than 28 days, when main hydration
processes are finished, problem LRW is pumped into the pore space of the porous concrete matrix through previously positioned
the special feed tube. <strong>The</strong> hardened porous concrete matrix is impregnated with problem liquid radioactive wastes which penetrate
into the pore space. Depending on kind of LRW contents of waste in the final product has made 50-65 % vol. <strong>The</strong> final conditioning
product has meet requirements. LRW is fixed very reliable inside pores of the cement matrix
O) SEPARATION OF LANTHANIDE FISSION PRODUCTS IN A EUTECTIC WASTE SALTS
DELIVERED FROM PYROPROCESSING OF A SPENT OXIDE FUEL BY
USING LAB-SCALE OXIDATIVE PRECIPITATION APPARATUS - 16127
Yung-Zun Cho, Korea Atomic Energy Research Institute (Korea)
Co-precipitation experiments of lanthanides were carried out using this lab-scale apparatus(4kg-salt/batch). As lanthanides, 8
lanthanide elements(Y, La, Ce, Pr, Nd, Sm, Eu and Gd) were used. By reaction with oxygen, these 8 lanthanide chlorides were converted
their oxide(REO2, RE2O3) or oxychloride form. Since these lanthanide oxides or oxychlorides are nearly molten salt insoluble,
they all were precipitated by free settling in the bottom of molten salt bed, where about 7-8 hrs precipitation time was requested.
It was found that in the conditions of 700 ? - 12 hours sparging time and 5 L/min, all the used lanthanide elements showed over
99.5% oxidation efficiency. But in case of 800 ? molten salt temperature only after 7 hours they showed over 99% oxidation efficiency.
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