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Absorption and desorption of carbon dioxide in several water types
Author(s) -
AlHindi Mahmoud,
Azizi Fouad
Publication year - 2018
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22901
Subject(s) - alkalinity , brackish water , desorption , salinity , carbon dioxide , seawater , chemistry , mass transfer , absorption (acoustics) , mass transfer coefficient , absorption of water , analytical chemistry (journal) , environmental chemistry , adsorption , chromatography , materials science , geology , oceanography , organic chemistry , composite material
This study investigated the effect of water type on the rate of CO 2 transfer from/to an aqueous phase with varying degree of water salinity. The absorption and desorption experiments were conducted on reverse osmosis product, brackish well, and brackish water reverse osmosis reject waters as well as seawater in a mechanically agitated tank. Results show that the direction of mass transfer has a major impact on the value of the volumetric mass transfer coefficient, k L a , with the absorption experiments always rendering higher values. Furthermore, k L a values always decreased with salinity in both absorption and desorption experiments until a certain critical salinity value was reached, beyond which mass transfer increased again. However, k L a values were found to decrease continuously with an increase in the water alkalinity in absorption experiments, while no clear conclusion could be drawn for the alkalinity effect in the case of desorption experiments. These observations suggest that the effect of alkalinity should be further investigated to elucidate its impact along with the salinity on the volumetric mass transfer rate.