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1
Content available remote Application of genetic algorithms to determine heavy metal ions sorption dynamics on clinoptilolite bed
100%
Tomczak E. , Kamiński W.
Chemical and Process Engineering
|
2012
|
tom 33
|
nr 1
103-116
EN
In the last decade a growing interest was observed in low-cost adsorbents for heavy metal ions. Clinoptilolite is a mineral sorbent extracted in Poland that is used to remove heavy metal ions from diluted solutions. The experiments in this study were carried out in a laboratory column for multicomponent water solutions of heavy metal ions, i.e. Cu(II), Zn(II) and Ni(II). A mathematical model to calculate the metals' concentration of water solution at the column outlet and the concentration of adsorbed substances in the adsorbent was proposed. It enables determination of breakthrough curves for different process conditions and column dimensions. The model of process dynamics in the column took into account the specificity of sorption described by the Elovich equation (for chemical sorption and ion exchange). Identification of the column dynamics consisted in finding model coefficients β, KE and Deff and comparing the calculated values with experimental data. Searching for coefficients which identify the column operation can involve the use of optimisation methods to find the area of feasible solutions in order to obtain a global extremum. For that purpose our own procedure of genetic algorithm is applied in the study.
2
Content available Application of genetic algorithms to determine heavy metal ions sorption dynamics on clinoptilolite bed
75%
Tomczak E. T. , Kamiński W. L.
Chemical and Process Engineering
|
2012
|
tom Vol. 33, nr 1
103-116
EN
In the last decade a growing interest was observed in low-cost adsorbents for heavy metal ions. Clinoptilolite is a mineral sorbent extracted in Poland that is used to remove heavy metal ions from diluted solutions. The experiments in this study were carried out in a laboratory column for multicomponent water solutions of heavy metal ions, i.e. Cu(II), Zn(II) and Ni(II). A mathematical model to calculate the metals' concentration of water solution at the column outlet and the concentration of adsorbed substances in the adsorbent was proposed. It enables determination of breakthrough curves for different process conditions and column dimensions. The model of process dynamics in the column took into account the specificity of sorption described by the Elovich equation (for chemical sorption and ion exchange). Identification of the column dynamics consisted in finding model coefficients [beta], KE and Deff and comparing the calculated values with experimental data. Searching for coefficients which identify the column operation can involve the use of optimisation methods to find the area of feasible solutions in order to obtain a global extremum. For that purpose our own procedure of genetic algorithm is applied in the study.
3
Content available Studying the Efficiency of Treatment Model Mixtures of Petroleum Products with the Modified Sorbent Made of Ash-and-Slag During Dynamic Sorption
75%
Korotkova T. G. , Bushumov S. A. , Ksandopulo S. Y. , Solonnikova N. V.
Journal of Ecological Engineering
|
2019
|
tom Vol. 20, nr 11
202--209
EN
Experimental studies on the dynamic sorption of model mixtures containing petroleum products were performed. The subject of the study was the modified sorbent from the ash-and-slag wastes accumulated in the ash dump of the Novocherkassk State District Power Plant (SDPP) (Russia, Novocherkassk, Rostov Region), obtained using the method of ash removal. The quantity of the sorbent for each model solution was fixed at 5.0 g. The model solutions in the amount of 1 dm3 were passed through a column filled with the modified sorbent at constant filtration rate w = const with filtrate takeout of 0.1 dm3/min. The pH value of the solution, which is advisable for extracting petroleum products, was determined experimentally. For this purpose, the model solutions, containing 100 mg/dm3 of petroleum products with pH = 1.65, 4.01, 6.86, 8.12, 9.18, and 11.34, were prepared. The optimum pH value of the solution was considered pH = 7.5. The content of petroleum products in the filtrate in all experiments was determined using IR spectrometry. The working range of water pollution with petroleum products was determined on a series of model solutions containing petroleum products in the range between 0.5 and 10 mg/dm3 with the increment of 0.5, between 10 and 100 mg/dm3 with the increment of 10, and between 100 and 1,000 mg/dm3 with the increment of 100. The maximum extraction of petroleum products from the solution was 88.23%. The applicability of the Henry’s law to the range of petroleum products concentrations in the filtrate of 50 mg/dm3 was confirmed. The adsorption equilibrium constant (Henry’s law constant) was determined experimentally. The effect of the natural freshwater matrix on the degree of petroleum products extraction was studied; no significant effect on petroleum products sorption was found. A conclusion was made that the sorbent can ensure the efficiency of water purifying from petroleum products of no less than 85% in the range of pollution between 5 and 300 mg/dm3.
4
Dynamika sorpcji surfaktantów na powierzchni międzyfazowej ciecz-gaz
63%
Sosnowski T. R.
Inżynieria Chemiczna i Procesowa
|
2001
|
tom T. 22, z. 3E
1297--1302
PL
Przedstawiono i zweryfikowano doświadczalnie model obliczeniowy umożliwiający określenie dynamiki redukcji napięcia powierzchniowego przez surfaktant występujący w roztworze. Przedyskutowano wpływ poszczególnych etapów ruchu masy na szybkość gromadzenia się surfaktantu przy powierzchni między fazowej. Sformułowano wnioski praktyczne dotyczące oceny dynamiki sorpcji związków powierzchniowo czynnych w warunkach przemysłowych.
EN
The computational model of dynamics of surface tension réduction by the surfactant adsorbing from the solution was formulated, solved and verified experimentally. The influence of different mass-transfer steps on the process was discussed. Practical conclusions regarding the surface tension réduction in technological situations were presented.
5
Content available Dynamika sorpcji barwnika Direct Orange 26 na sorbencie roślinnym - kolbach kukurydzy
63%
Tomczak E. , Blus M.
Proceedings of ECOpole
|
2015
|
tom Vol. 9, No. 1
347--356
PL
W pracy prowadzono badania dla układu barwnik azowy - sorbent roślinny. Barwnik azowy Direct Orange 26 pochodził z Zakładu Boruta-Zachem Kolor Sp. z o.o. Jako biosorbentu użyto modyfikowanych chemicznie granulowanych kolb kukurydzy. Wykonano eksperymenty w kolumnie, kontrolując w czasie zmiany stężenia barwnika w roztworze i sorbencie. Wyznaczono krzywe przebicia w zależności od stężenia początkowego roztworu, objętościowego natężenia przepływu i wysokości złoża. Na tej podstawie dokonano opisu matematycznego dynamiki sorpcji w oparciu o model prezentowany w literaturze. Stwierdzono możliwość wykorzystania kolb kukurydzy jako obiecującego materiału sorpcyjnego.
EN
The azo dye and plant derived sorbent system was investigated in this paper. Direct Orange 26 dye was acquired from Boruta-Zachem Kolor Sp. z o.o. Corncobs obtained from Chipsi Mais Germany were used as the biosorbent. The changes in the dye and sorbent concentrations with time were measured and used for further calculations. The experiments were carried out in a laboratory fixed-bed column. Sorption dynamics were described by a model presented in the literature. It was found that corncobs can be used as a promising sorbent material.
6
Content available remote Sorption dynamics of Direct Orange 26 dye onto a corncob plant sorbent
63%
Tomczak E. , Blus M.
Ecological Chemistry and Engineering. S
|
2016
|
tom Vol. 23, nr 1
175--185
EN
The azo dye and plant-derived sorbent system was investigated in this paper. Direct Orange 26 azo dye was acquired from Boruta-Zachem Kolor Sp. z o.o. Chemically modified granulated corncobs obtained from Chipsi Mais Germany were used as the biosorbent. The changes in the dye and sorbent concentrations with time were measured and used for further calculations. The experiments were carried out in a laboratory fixed bed column. Breakthrough curves were plotted for different initial concentrations, volumetric flow rates and bed heights. Sorption dynamics was described by a model presented in the literature. It was demonstrated that Infrared analysis of the system allows to determine the nature of the dye-sorbent bond. It was found that corncobs can be used as a promising sorbent material.
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