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21Journal of Siberian Federal University. Engineering & Technologies, 2019, 12(2), 182-191
yflK 628.33; 628.316.12
The Prospects of Utilizing the Modified Sorption Material to Intensify Purification of Waste Water from Electroplating Production
Tatiana А. Kurilina, Olga G. Dubrovskaya*, Vladimir A. Kulagin, Anatoly I. Matyushenko and Anastasiya G. Bobrik
Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia
Received 08.02.2019, received in revised form 15.02.2019, accepted 20.02.2019
One of the sources of environmental pollution with hazardous substances, primarily heavy metals, is the electroplating industry. The prevention ofpollution of water bodies with wastewater containing heavy metal ions is closely related to reducing the consumption offresh water for the technological needs ofproduction and to reducing the amount of effluent. One of the solutions to this problem is to create low-waste and waste-free environmentally safe technological processes of wastewater treatment using treated effluents in the recirculation system, which reduces the negative impact on the environment. The results of studying the sorption properties of the natural modified mineral Akdolit-Gran prove a high efficiency of this sorption filling when conditioning electroplating shop effluents contaminated with a complex of heavy metals. Taking into account a relatively low cost of this natural mineral, Akdolit-Gran has the advantages in terms of its economic feasibility, plus the high degree of extraction of metals using this sorbent together with its low consumption allows designing recirculation systems for industrial enterprises meeting the requirements for physical and chemical parameters of service water.
Keywords: sorption neutralization, heavy metal ions, modified sorbent, dolomite rocks.
Citation: Kurilina T.A., Dubrovskaya O.G., Kulagin V.A., Matyushenko A.I., Bobrik A.G. The prospects of utilizing the modified sorption material to intensify purification of waste water from electroplating production, J. Sib. Fed. Univ. Eng. technol., 2019, 12(2), 182-191. DOI: 10.17516/1999-494X-0127.
© Siberian Federal University. All rights reserved
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). Corresponding author E-mail address: [email protected]
Перспективы использования модифицированного сорбционного материала для интенсификации очистки воды электропромышленного производства
^А. Курилина, О.Г. Дубровская, В.А. Кулагин, А.И. Матюшенко, А.Г. Бобрик
Сибирский федеральный университет Россия, 660041, Красноярск, пр. Свободный, 79
Одним из источников загрязнения окружающей среды опасными веществами, прежде всего тяжелыми металлами, является гальваническая промышленность. Предотвращение загрязнения водоемов сточными водами, содержащими ионы тяжелых металлов, тесно связано с сокращением потребления пресной воды на технологические нужды производства и с уменьшением количества сточных вод. Одним из решений этой проблемы является создание малоотходных и безотходных экологически безопасных технологических процессов очистки сточных вод с использованием очищенных стоков в рециркуляционной системе, что снижает негативное воздействие на окружающую среду. Результаты изучения сорбционных свойств природного модифицированного минерала акдолит-гран доказывают высокую эффективность этого сорбционного наполнения при кондиционировании цехов гальванического производства, загрязненных комплексом тяжелых металлов. За счет относительно низкой стоимости акдолит-гран обладает преимуществами с точки зрения его экономической целесообразности, плюс высокая степень извлечения металлов с использованием этого сорбента вместе с его низким расходом позволяет создавать системы рециркуляции для промышленных предприятий, отвечающие требованиям к физико-химическим показателям технической воды.
Ключевые слова: сорбционная нейтрализация, ионы тяжелых металлов, модифицированный сорбент, доломитовые породы.
Current state of the problem
Sorption extraction of metals is one of the most effective methods for cleaning effluent of electroplating, its effectiveness is 80-95% depending on the sorbent used. The sorption technique of wastewater treatment using natural sorbents has been known for a long time, however, there is a large class of natural sorbents minerals which, have not been widely used due to the lack of knowledge [1-6]. Meanwhile, their advanced sorption properties, low cost, and natural abundance make them an economically feasible raw material in industrial wastewater treatment technologies. Natural materials, as a rule, are most preferable as sorption filling in terms of environmental and economic expediency. However, to increase the sorption activity and sorption capacity, the original natural materials need to be modified. The methods of modifying and activating natural sorbents include heat treatment, acid or alkaline exposure. Activation and enhancement of the sorption properties of natural materials allow obtaining highly efficient fillings with desired sorption properties and a certain selectivity.
Currently, taking into account the growing need for recirculation systems of treated industrial wastewater, searching for effective and economically-viable natural sorbents to intensify effluent treatment is an immediate problem [8, 9].
Research methods
This paper studies the sorption method for removal of a complex of heavy metals, for example, Cu (II); Ni (II) and Zn (II), from aqueous solutions with a modified sorbent which bases on dolomite raw materials. This sorbent, Akdolit Kesselburger Pelm Gran CM3 (Akdolit-Gran) is produced in Germany and is widely used in Europe and the European part of Russia.
The sorbent material is thermally activated and modified by calcining the natural mineral. Calcination contributes to loosening of the rock with the formation of structures with greater porosity and specific surface [10, 11]. The approximate chemical composition of Akdolit-Gran: calcium carbonate CaCO3 - 68.9%; calcium oxide CaO - 1.4%; magnesium oxide MgO - 25.4%; magnesium carbonate MgCO3 - 0.6%; iron oxide Fe2O3 - 0.6%; aluminum oxide Al2O3 - 2.7%; silicon oxide SiO2 -0.3%; water H2O - 2.7%. The percentages of the substances obtained on the basis of a regular physical and chemical testing and are the average statistical values.
Research results
The objective was to study the physical and chemical and sorption properties of Akdolit-Gran.
To carry out the sorption in the laboratory, we used the method of variable sorbent weights and constant volumes of the simulated solution with the initial ion concentration: Cu (II) = 60 mg/dm3; Ni (II) = 15 mg/dm3; Zn (II) = 20 mg/dm3. These concentrations are most commonin theelectroplating industiy wastewater. The residual concentration was determined on an ICAP-6500 Inductively Coupled Plasma Atomic Emission Spectrometer.
The rczbent mineraiohical composition was determtned based in the data from X-ray cro/taOlrgraphy ccrcied oet oz a DPON-t diffrznSomeler, in СЫПс raniaticn.
Th/ enalysosafihegiffrcctagzam indica/ea iharthe main phrte /n the eorben/ te calcitc PaCO3 (ddODP; 0.30; 0.23; 0.19; 0.18 Dp; bzsides, there is a rather significant amount of magnesium oxide MgO
Fig. 1. The diflractogram of Akdolit-Gran
(d=0.21; 0.15 A). Low-intensity diffraction maxima correspond to magnesium hydroxide Mg(OH)2 (d=0.21; 0.15 A) and calcium hydroxide Ca(OH) 2 (d=0.49; 0.26 A) resulting from hydrolysis oxides of magnesium and calcium contained in the sorbent. The remaining substances specified in the technical documentation for the sorbent (MgCO3, Fe2O3, Al2O3, and SiO3) were not detected due to their low concentration. For a more detailed study of the sorbent sample, we carried out a thermal analysis on an STA 449 F1 (simultaneous thermal analyzer), by NETZSCH (Germany), in an argon medium. The thermogram of the Akdolit-Gran sample is shown in Fig. 2. The number, shape and position of various exothermic and endothermic peaks relative to the temperature scale were used to qualitatively identify the sample being studied.
The sample thermal analysis data show 4 endo-effects on the DSC. A minor endo-effect at 109 °C refers to removal of the adsorbed water, the endo-effect at 430 °C is caused by dehydration of Mg(OH)2:
Mg(OH)2^ MgO+H20;
meanwhile, the sample mass, as shown by the TC, decreases ~ 5.59% in this temperature range, the compound of Mg(OH)2 in the sample is ~ 18%, it is followed by the endo-effect at 4760 which is caused by dehydration of Ca(OH)2:
Ca(0H)2^Ca0+H20;
the mass decreases by 0.59%; a large endo-effect is observed at t=844 °C, which is related to calcite decarbonization, i.e. calcite CaCO3 decomposes with formation of C02:
CaC03^Ca0+C02t;
the sample mass is reduced by approximately 27%, the content of CaC03 in the sample is 61.4% according to the thermogram.
flTP /(%/mhh
Tr/% flCK/(M«B/«.r)
Fig. 2. Thermog ramofAkdolit-Gran: DTC is a differential thermogravimetric curve (shows the rate ofchange of mass,thfs isthr first derinaOigv ofTht TC is a ifenmogrovimetric curvo wTtchshoweifechange of mars turing heating (thvmes t iftoeaseo or decreases), DOC ioodiffenrntial sernning cvrke(mSC arf Dhha sfoc eaOg - and exo-nffitaroocoumnT toriog htating,E)kAisaoanaeesisfeomoess>oimt,hSCis anansiysie Trom the whole surface)
According to the data of differential-thermal and X-ray phase analyses of the sorbent, we can conclude that during heat treatment, chemical transformations also take place, which results in the formation of calcium carbonate and magnesium oxide.
We determined the technical characteristics of the sorbent abiding by the standard techniques (see Table 1).
The dose values of the proposed sorption material are found experimentally and given in Table 2.
The experiment performed (see Table 2) showed that the cleaning effect with the use of Akdolit-Gran sharply reduces in an acidic medium. The reason for this can be a change in the colloid-chemical properties of the sorbent, the isoelectric point of which corresponds to pH = 5.4 approximately, therefore, when the pH is below this value, the reaction centres on the sorbent granules are deactivated,
Table 1. Technical characteristics of the sorbent
Total pore volume, V (cm/g) 0.103
Bulk density, pb (g/cm 3) 1.15
Real density p (g/cm 3) 2.37
Average density p0 (g/cm 3) 2.26
Porosity P (%) 4.64
Water absorption W (%) 10.3
Table 2. The experimental results
No. Dsb - dose of the sorbent mg/dm3 pH0 Residual concentration of Cu2+, mg/dm3 Residual concentration of Ni2+, mg/dm3 Residual concentration of Zn2+, mg/dm3
1 1.0 3.0 9.736 6.128 4.902
2 1.0 7.0 0.123 1.495 1.295
3 1.0 9.0 1.131 0.183 0.0152
4 1.0 11.0 1.268 0.199 0.0098
5 1.2 3.0 8.131 6.103 3.663
6 1.2 7.0 0.305 0.923 1.306
7 1.2 9.0 0.192 0.163 0.0081
8 1.2 11.0 0.193 0.198 0.0093
9 1.6 3.0 7.961 5.932 3.569
10 1.6 7.0 0.129 0.138 1.0061
11 1.6 9.0 0.109 0.162 0.0062
12 1.6 11.0 0.203 0.204 0.0161
13 2.0 3.0 7.805 5.862 4.998
14 2.0 7.0 0.905 0.132 1.0092
15 2.0 9.0 0.129 0.193 0.0103
16 2.0 11.0 0.151 0.235 0.0198
the bimolecular attraction of the binary layer decreases, which causes electrostatic repulsion of metal ions from the sorbent surface.
When analysing the sorption parameters of the studied Akdolit-Gran, we determined the following: Asb - absorbing capacity of the sorbent, kd - a coefficient of metal distribution between the simulated solution and the sorbent, ksb - a preset degree of the sorbent capacity exhaustion, R - a degree of metal extraction from the solution, Dsb - dose of the sorbent [12-14]. The calculus results are given in Tables 3-5.
The sorption capacity of Akdolit - Gran varies in respect of the studied materials. Evaluation of the sorbent efficiency for extraction of metals from aqueous solutions using a specific sorption capacity
Table 3. The absorbing capacity of Akdolit-Gran (Asb, mg/g)
Item Dsb - dose of Akdolit -Gran, mg/dm3 Cu2+ Ni2+ Zn2+
1 1 57.74 13.01 19.87
2 1.2 48.16 11.71 16.37
3 1.4 41.28 10.27 14.14
4 1.6 36.76 8.63 12.35
5 1.8 32.26 7.26 10.54
6 2.0 28.15 6.37 9.19
Table 4. The coefficient of metal distribution between the simulated solution and the sorbent (kd, g/dm3)
Item Dsb - dose of Akdolit -Gran, g/dm3 Cu2+ Ni2+ Zn2+
1 1 25.59 6.55 155.23
2 1.2 21.81 12.48 45.98
3 1.4 18.68 16.48 67.98
4 1.6 31.20 7.29 52.55
5 1.8 16.69 3.77 10.28
6 2.0 7.61 2.83 5.64
Table 5. The degree of metal extraction from the solutions (R, %)
Item Dsb - dose of Akdolit -Gran, g/dm3 Cu2+ Ni2+ Zn2+
1 1 96.24 86.76 99.36
2 1.2 96.32 93.75 98.22
3 1.4 96.32 95.85 98.96
4 1.6 98.03 92.11 98.92
5 1.8 96.78 87.16 94.87
6 2.0 93.83 84.94 91.86
can lead toerroneousconclusions.Thus, evaluation of theefficiency of immobilization of heavy metals using tiic valueeoithesaeutiec capacity gaveelhe foilowiag row al secption: Cu2+ > Zn2+ > Ni2+, and by mecns oeehameSals c^iWi^i^ticu^c^^U^ckC ond the degree ofaxtraehiTn ot metals we see the following csqoence: Ztf^ Cu2+h NP. TC+s is dueto tOefact tliat thecorpttsncapacity depends on the mass of the sample Sxken.
tunsc putenllaU i.c.asurfoce cha+ue of the ion can be used to assess a surface dissociation degree.
The ionization potential is determined by the formula
n ■ e IP =-,
r
where n is a number of electrons; e is an electron charge.
Cu2+, Zn2+ and Ni2+ have got 2 electrons, and the electron charge is 1.602. There is a dependence [12] stating that the larger the radius of the ion is, the smaller the ionization potential will be. The radius of the atom for Cu2+ is 1.278 A, the radius of the Zn2+ atom is 1.333 A, and the radius of the for the Ni2+ atom is 1.246 A; and according to this feature, the studied metals arrange in a row Zn2+ > Cu2+ > Ni2+, which corresponds to the experimental findings.
Table 6 shows the results of the study and calculation of the kinetics of the sorption process of copper(II), nickel(II) andzinc (II) ions.
Which also gives the following sequence of distribution of metals in the extraction rate:
Zn2+ > Cu2+ > Ni2+
As the sorption process is exothermic, when temperature increases, the capacity of the sorbent with respect to metals decreases [15, 16], which is confirmed by the results (Table 7).
The phenomena of physical and chemical sorption clearly differ in some rare cases. There usually occur intermediate variants when the bulk adsorbed substance is relatively weakly bound, and only a small part of it binds firmly [17-19]. When the temperature is rising, an increase in chemical adsorption begins blocking a fall in physical sorption, starting from a certain temperature; therefore, the temperature dependence of sorption has a clear minimum in this case (Table 8).
These experimental data were used to develop a project to restore wastewater treatment facilities using the proposed sorption material.
Table 6. The results of the calculation of the sorption rate constant, depending on the dose of the sorbent
Dsb - dose of the sorbent mg/dm3 K, sec-1
Cu2+ Ni2+ Zn2+
1 3.28 2.02 5.05
1.2 3.3 2.77 4.02
1.4 3.3 3.18 4.56
1.6 3.9 2.54 4.44
1.8 3.4 2.05 2.97
2.0 2.78 1.89 2.51
Table 7. The dependence of the sorption capacity (Asb, mg/g) and the solution temperature, mg/g
Item Temperature °С Asb, mg/g
Cu(II) Ni(II) Zn(II)
1 11.5 41.78 10.22 14.06
2 17.0 42.75 10.59 14.28
3 25.0 42.76 10.63 14.26
4 33.0 42.76 10.67 14.28
5 38.5 42.77 10.70 14.27
6 60.0 42.76 10.62 14.22
7 70.5 42.71 10.61 14.20
8 80.0 42.71 10.57 14.14
Table 8. The calculation results for the dependence of the residual concentration and the temperature of the aquatic medium
Temperature °С С
Cu(II) Ni(II) Zn(II)
11.5 2.201 0.689 0.308
17.0 0.151 0.161 0.005
25.0 0.128 0.112 0.031
33.0 0.131 0.056 0.0053
38.5 0.121 0.013 0.0101
60.0 0.136 0.128 0.0805
70.5 0.207 0.146 0.108
80.0 0.210 0.202 0.196
Conclusion
The results of studying the sorption properties of the natural modified mineral Akdolit-Gran prove a high efficiency of this sorption filling when conditioning electroplating shop effluents contaminated with a complex of heavy metals. Taking into account a relatively low cost of this natural mineral, Akdolit-Gran has the advantages in terms of its economic feasibility, plus the high degree of extraction of metals using this sorbent together with its low consumption allows designing recirculation systems for industrial enterprises meeting the requirements for physical and chemical parameters of service water.
Based on these results, we can conclude the following:
1. It is reasonable to use this sorbent as a potential ion exchange sorbent to treat the electroplating effluents since calcium and magnesium ions function as the exchangeable ions.
2. The cation sorption occurs both via the mechanism of ion exchange (exchange with cations in inter-packet spaces and via formation of complex compounds.
3. The optimal amount of Akdolit-Gran is about 1.4-1.6 gr/dm3 for solutions with an initial concentration: Cu (II)=60 gr/dm3; Ni (II)=15 gr/dm3; Zn (II)=20 gr/dm3, the temperature range is set within 33,0 - 38,0 °С.
4. The effect of cleaning the effluent from heavy metals using Akdolit-Gran is 93-98% in an alkaline environment, but it sharply decreases in an acidic environment.
Acknowledgment
The reported study was funded by RFBR and the government of Krasnoyarsk region according to the research projects №№ 18-48-242001, 18-41-242004, 18-41-242008
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