Centrifugation – an effective method for intensifying adsorption process in water treatment
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MAFTULEAC, Alexei, TIMBALIUC, Nina. Centrifugation – an effective method for intensifying adsorption process in water treatment. In: Ecological and environmental chemistry : - 2017, Ed. 6, 2-3 martie 2017, Chișinău. Chisinau, Republic of Moldova: Academy of Sciences of Moldova, 2017, Ediția 6, p. 120.
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Ecological and environmental chemistry
Ediția 6, 2017
Conferința "Ecological and environmental chemistry 2017"
6, Chișinău, Moldova, 2-3 martie 2017

Centrifugation – an effective method for intensifying adsorption process in water treatment


Pag. 120-120

Maftuleac Alexei, Timbaliuc Nina
 
Institute of Chemistry of the Academy of Sciences of Moldova
 
 
Disponibil în IBN: 12 martie 2019


Rezumat

Increasingly precarious situation caused by pollution of the environment with harmful chemicals put in front of the researches the problem of intensification of water treatment process using in this purpose physicochemical methods. One of these methods often used is adsorption of pollutants on mineral and carbonaceous adsorbents. It is widely recognized that the efficacy of the adsorption process depends on the adsorbent characteristics – the specific adsorption capacity and duration of its saturation, when maximal adsorption amount of pollutant is close to value of adsorbent capacity. In the ideal case the both sizes are becoming equal. The displacement of pollutant molecules to the surface of adsorbent occurs due to external diffusion - from solution to the solid particles and by internal diffusion - though the pores inside the adsorbent particles. The first type of mass transfer can be easily controlled, but the second process is more difficult to control. The aim of this work was to increase the diffusion of the pollutant in the adsorbent granules using therefore the centrifugal force. Centrifugation is widely used in various branches of modern industry serving as a method to intensify the technological process [1]. In our experiments activated carbon as adsorbent was used, and as a pollutant – the Congo red dye. Their selection as a study objects was dictated by the necessity to have a rigid and stable structure of the adsorbent and a predominantly sorption mechanism of the pollutant in the pores. Contacting of dye solutions of different concentrations was performed in glasses with one and the same amount of charcoal in different (parallel) conditions: with centrifugation, with shaking and in static condition. The German centrifuge K 52.1 and Water Bath Shaker 357, Polish production, were used. Analysis of the experimental results was performed comparing maximal values of the specific adsorption after certain time intervals. The highest efficacy was observed at centrifugation: sorbent saturation is reached (at 2-4 thousand rot/min) in only 2-3 hours, while during the shaking (150-250 osc/min) – after 6-8 days, and in static conditions – after 9-11 days. This fact is due to centrifugal force, which forces the dye molecules faster penetrate into charcoal particles and to occupy the space of the pores, thereby influencing the adsorption kinetics. Performing adsorption in centrifugal field reduces at minimum duration of the process using more compact technical equipment, which corresponds to current trends in technique and technology.