The Extraction of Activated Carbon from Aqueous Solutions in the Presence of Organic and Inorganic Compounds by the Electroflotation Method View Full Text


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Article Info

DATE

2021-03

AUTHORS

A. M. Gaydukova, A. S. Nenasheva, V. A. Kolesnikov, N. A. Vetlugin

ABSTRACT

The paper shows the possibility and prospects of using the electroflotation method for extracting a spent carbon sorbent by way of example of an activated carbon of the MeKS-O brand from aqueous solutions. It is found based on the conducted research that the electroflotation method makes it possible to extract granular activated carbon already after 10 min of processing. At the same time, methods such as sedimentation and filtration used for this purpose require a longer time and frequent replacement of the filter material. Data on the effect of organic (surfactants, flocculants) and inorganic (a FeCl3 coagulant) additives on the efficiency of the process are obtained. It is found that the introduction of surfactants of various natures as well as a C-496 cationic flocculant and an N-300 nonionic flocculant into the solution suppresses the process of extraction of activated carbon. At the same time, an M-345 anionic flocculant promotes an increase in the degree of extraction of carbon up to 53%. The electroflotation process proceeds more efficiently in a solution containing Fe3+ ions; here, the degree of extraction of the sorbent increases up to 83% at pH 4 within 10 min of processing. Studies on the combined effect of the organic additives and a coagulant are also conducted. A composition based on iron chloride and anionic surfactants is selected, the use of which significantly increases the degree of extraction of the carbon sorbent as well as expands the range of extractable concentrations of the latter up to 600 mg/dm3. Studies on the effect of background salts, NaCl and Na2-SO4, on the efficiency of the process are conducted in this work, and it is found that the degree of extraction of activated carbon has higher values in solutions containing a chloride ion. At the same time, electroflotation is substantially suppressed in salt systems containing 50 g/dm3 NaCl. An important parameter in the processes of electroflotation extraction is the current density. It is found that the maximum value of the degree of extraction of carbon is observed at the volume current density of 0.4 A/dm3. More... »

PAGES

116-122

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URI

http://scigraph.springernature.com/pub.10.3103/s1063455x21020077

DOI

http://dx.doi.org/10.3103/s1063455x21020077

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1138707869


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