Journal of Power and Energy Engineering, 2015, 3, 35-40
Published Online April 2015 in SciRes. http://www.scirp.org/journal/jpee
How to cite this paper: Kulyukhin, S.A., Kulemin, V.V., Krapukhin, V.B., Lavrikov, V.A., Gordeev, A.V., Shiryaev, A.A. and
Bessonov, A.A. (2015) Clearing of the Radioactive Liquid Waste from Oils and Oil Products by UV-Radiation at NPPs. Journal
of Power and Energy Engineering, 3, 35-40. http://dx.doi.org/10.4236/jpee.2015.34006
Clearing of the Radioactive Liquid Waste
from Oils and Oil Products by
UV-Radiation at NPPs
Sergey A. Kulyukhin, Vladimir V. Kulemin, Vladimir B. Krapukhin, Viktor A. Lavrikov,
Andrey V. Gordeev, Andrey A. Shiryaev, Alexey A. Bessonov
Frumki n’s Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia
Received N ovemb er 2014
The basic methods of concentration and purification of liquid radioactive waste on the nuclear
power plant are distillation and ionic exchange. During vaporization of oil waste products and the
fulfilled washing solutions the part of oil passes into a condensate. Clearing of such condensate on
ion-exchanged filters results to oiling of ion-exchanged materials and to decrease number of filter
cycles. Due to the often regeneration of ion-exchanged filters additional volumes of waste products
as the fulfilled reclaiming solutions, washing and loosening waters are formed. The attention of
scientists was involved with methods of clearing of water environments from the organic sub-
stances, based on deep oxidizing transformations of hydrocarbons into carbonic gas and water.
From processes of oxidation of hydrocarbons up to CO2 and H2O, sold at moderate conditions, our
attention has involved photochemical oxidation with the help of UV-radiati on.
Nuclear Power Plant, Liquid Radioactive Waste, Oil, UV-Rad ia tio n
The main methods of concentration and purification of liquid radioactive waste (LRW) at Russian nuclear power
plants (NPPs) are distillation and ion exchange. Evaporation of oily waste and the spent washing solutions part
of oil goes into the condensate. The purification of this condensate by ion exchange results to oiling filter ex-
change materials and reduce the number of filtration cycles. Additional quantities of waste in the form of the
fulfilled reclaiming solutions, washing and loosening waters are produced by more frequent regeneration of ion-
exchange filters. According to the technology adopted by the NPP, the condensate was purified from the oil on
coal filters or filters downloaded by copolymer of styrene and divinylbenzene. Such purification is not effective
and often does not provide the requirements established for the waste water. Therefore was been sought the
more efficient methods of oil allocation from aqueous media. Main attention was attracted to the purification of
aqueous environments from organic substances, based on the deep oxidative transformations of hydrocarbons in
S. A. Kulyukhin et al.
carbonic dioxide and water. Processes of hydrocarbons oxidation to CO2 and H2O, sold under mild conditions,
can be distinguished the oxidation by ozone, hydrogen peroxide and etc., electrochemical, electrocatalytic and
photochemical oxidation -. Among these will be the last method seems the most promising, because it al-
lows selective using of energy without the addition of certain substances for chemical transformations. In addi-
tion, the exclusion of sorbents for cleaning water solutions reduces the amount of solid radioactive waste. This
paper deals with the establishment of some cleaning regularities of water solutions, including model and real
LRW of Russian Kalinin’s NPP, from petroleum oils by photochemical method.
The cleaning effects of temperature and initial oil content were studied. The scheme of set-up for study of the
effects of temperature and initial oil content into purification are presented on Figure 1. The set-up consists of
thermostat cup 1 with cleaned medium mounted on a magnetic stirrer 2. The irradiation carried out by a mercury
lamp 3 (capacity of a lamp was 220 Wt). The focusing mirror 4 was used for a more complete using of the lamp.
200 ml of water with certain amount of spindle oil was irradiated. The choice of spindle oil was conditioned due
to its wide use as a lubricant. The research was carried out at oil content 8.5 and 17 mg/dm3. Thus air oxygen
dissolved in the liquid and entrapped it from surrounding atmosphere while stirring was used for oxidation. The
researches of cleaning up oil model solution simulating trap waters of NPP were also conducted. Model solution
of trap water contained, g/dm3: NaNO-0.166, Na2SO4-0.074, H3BO3-1.576, KNO3-1.295, NH3-1.0, oils-17 ×
The installation with the mercury lamp introduced into solution for practicing water solutions cleaning mode
was developed (Figure 2). This set-up included reactor 1, mercury lamp 2 in a quartz glass case 3 and agitator 4.
The 1 dm3 of solution was irradiated. The purified aqueous solution heated during a mercury lamp irradiation.
During process the solution was heated from temperature 25˚C ± 1˚C to some final temperature.
3. Results and Discussion
As follow from Figure 3, the temperature increasing may increase the rate of purification. It is apparently
Figure 1. The scheme of set-up for study of the effects of tempera-
ture and initial oil content. (1-temperature-controlled glass, 2-mag-
netic stirrer, 3-high pressure mercury lamp, 4-focusing mirror).
S. A. Kulyukhin et al.
Figure 2. Set-up for testing regimes of cleaning aqueous solution
from oils. (1-reactor, 2-pressure mercury lamp, 3-case of quartz glass,
Figure 3. The dependence of the residual oil from the exposure time.
(1-the model solution with Co = 17 mg/dm3, T = 67˚C; 2-oil-water
mixture with Co = 17 mg/dm3, T = 52˚C; 3-oil-water mixture with Co =
17 mg/dm3, T = 67˚C; 4-oil-water mixture with Co = 8.5 mg/dm3, T =
52˚C; 5-oil -water mixture with Co = 8.5 mg/dm3, T = 67˚C).
explained by the contribution of the secondary “dark” reactions of atmospheric oxygen and the photolysis prod-
ucts of oil. The most sharply reduced oil content for small irradiation time, when the content of the organic
phase is large. With increasing initial concentrations of oil in water increases the rate of decomposition organic
phase. Thus, if the initial oil concentration of 8.5 mg/dm3 for 0.5 h at 67.0˚C ± 0.5˚C its loss is 1.24 mg, then the
initial concentration of 17 mg/dm3, and the same temperature the loss is equal to 2.52 mg, that is almost 2 times
more. The oil decomposition rate increasing with increase of the initial amount can be clearly explained, firstly,
increasing the probability by collision of UV radiation photons with oil molecules at increasing concentrations,
and, secondly, it should be borne in mind that the petroleum oils are composed of substances which absorb UV
radiation having a wavelength as
< 200 nm, and with
> 200 nm. For example, aromatic compounds capable
S. A. Kulyukhin et al.
of absorbing light with
> 200 nm - are alkanes unlike almost transparent in this area    .
Compounds, which can absorb UV radiation with
> 200 nm, become excited and probably able to transmit
their energy to oxygen molecules or organic substances that are transparent to the radiation of long wave length.
Thus, the spectrum of the mercury lamp radiation was expanded. Excited organic molecules react apparently by
dark reactions with triplet or singlet oxygen. The data of model solution cleaning are shown in Figure 3. As
follow from Figure 3, in this case the cleaning rate is less than the mixture of oil and water is irradiated. It is
obviously due to the absorption of the UV radiation by ions presented in the model solution. Table 1 shows the
purification of aqueous media from the oil data obtained by introducing mercury lamp defecating directly into
the solution (see Figure 2). Due to heating of the solution by the mercury lamp, the energy consumption for
conducting the cleaning process was reduced. As seen from Table 1, the energy needed to decompose of the or-
ganic phase decreases with increasing initial oil content of the solution. At this rate of reduction of energy con-
sumption, starting from a certain initial amount of oil also begin to decline.
To verify the data obtained on the model solutions, studies have been conducted on waste water of Kalinin’
NPP. For check of the data received on model solutions, experiments have been carried out on waste water from
the tank of pure condensate, the pump of decontaminated water, and also the tank of trap waters of the Kalinin
NPP. Besides mineral oil trap waters contained, Bk/dm3: 13 4Cs-4.18 × 105, 137Cs-6.85 × 105, 54Mn-23.94 × 102,
131I-4.07 × 104, 60Co -7.92 × 103, 24Na-12.32 × 103, and also Fe3+-1.2 mg/dm3, Na+-3.0, K+-0.27, H3BO3-2.2
g/d m3, pH-from 9 up to 12. Density of a solution was 1.007 g/cm3. Water from the pump of degassed water and
the tank of pure condensate supervised only on the contents of mineral oil. Waste water is purified in a plant
similar to that shown in Figure 3. It was irradiated with 1.5 - 1.8 dm3. Experimental data are presented in Table
2, which show that by using photolysis for water from the tank of pure condensate containing the organic matter
Table 1. Experimental data on the purification of water and model solutions from oils by using of a mercury lamp.
Composition of solution The final
the solution, ˚C
time, min The oil content after
irradiation, mg The amount of the
decomposed oil, mg
1 dm3 of water +
0.004 ml of oil
85.0 30 0.46 2.94 0.037
99.5 60 0.14 3.26 0.067
1 dm3 of modeling solution
and oil, ml (mg/dm3)
0.008 (6.8) 100 60 0.25 6.55 0.033
0.008 (6.8) 99.5 45 0.23 6.57 0.025
0.020 (17) 99.5 45 0.37 16.13 0.010
0.060 (51) 99.5 60 5.38 45.42 0.005
Table 2. Experimental data on the purification of the Kalinin’s NPP LRW from oils.
No. LRW from Time
of the experiment, h
The concentration of petroleum
products, m g/dm3 The
Initial Final Initial Final
cond ens a t e
3.00 35.0 9 0. 0 1.10 0.20 5.5
2 1.50 73.0 9 4. 0 1.05 0.22 4.3
4 0.50 88.0 100.0 1.06 0.78 1.4
5 0.25 34.5 9 4. 0 1.61 0.50 3.2
6 The pump of
2.00 79.0 100.0 1.24 0.30 3.1
8 The tank of
trap waters 5.00 43.0 100.0 5.80 0.95 6.1
S. A. Kulyukhin et al.
Figure 4. IR spectra of the destruction products of spindle oil under UV radiation.
20 40 60 80
Figure 5. The X-ray diffraction pattern of the destruction products of spindle oil under
of more than 1 mg/dm3 can be purified to a concentration of less than 0.5 mg/ dm3, and hence re-use. Degassed
water after the evaporator with the initial content of more than 1 mg/dm3 can be purified to a concentration of
0.3 - 0.6 mg/dm3. Reducing the oil content is beneficial to the subsequent purification with ion-exchange resin.
Trap water can be purified from petroleum products to contain less than 1 dm3. However, in this case, the expo-
sure time increases significantly compared to purification of water from the pure condensate tank and the pump
S. A. Kulyukhin et al.
of degassed water. It is consistent with the data shown in Figure 3.
It was of interest for us to study the destruction products of spindle oil under UV radiation. Towards that end
we irradiated spindle oil in tantalum boats in air atmosphere, which resulted in formation of a very fine black
film. We recorded the IR spectra (Figure 4) and X-ray diffraction pattern (Figure 5) of the film.
Analysis showed that the IR spectra (Figure 4) mainly included bands due to the vibrations of C-Н and С-С
bonds . On the other hand, a study of the X-ray diffraction pattern showed that it included a set of peaks
similar to those theoretically calculated for methenamine in JCPDS-ICDD according to crystallographic data
. The chemical formula of methenamine is C6H12N4, and it is characterized by the presence of N-С bonds
. The appearance of nitrogen bonds in the composition of the destruction products might be due to that the
oil, along with hydrocarbon compounds, includes nonhydrocarbon compounds, which can have a respective hy-
drocarbon skeleton with one, two, and etc. sulfur, oxygen, and nitrogen atoms.
In conclusion, it should be noted that the removal of oil from aqueous radioactive solutions using UV radiation
is a promising method for water purification plant. Method of cleaning oil from aqueous solutions using UV
radiation is most convenient for cleaning radioactive condensates. Thus, the research study has demonstrated a
good potential of using UV radiation as an effective method to remove hydrocarbon products, including indus-
trial oils, from liquid radioactive waste.
Work is supported by Council about grants of the President of the Russian Federation for the state support of
leading scientific schools of the Russian Federation (grant SS-5418.2014.3).
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