| Title: | Desorption rate of volatile compounds in polishing ponds |
| Author(s): | Alves EM; Cavalcanti PF; van Haandel A; |
| Address: | "Federal University of Campina Grande, Aprigio Veloso 882, 58.109-920 Campina Grande - PB, Brazil" |
| ISSN/ISBN: | 0273-1223 (Print) 0273-1223 (Linking) |
| Abstract: | "Increase of pH in polishing ponds can be predicted quantitatively from variations in alkalinity and acidity. These variables are affected by processes that develop simultaneously in ponds: (1) CO(2) desorption, (2) biological CO(2) removal by photosynthesis and (3) NH(3) desorption. An experimental investigation was carried out to determine the desorption rate of carbon dioxide and ammonium. It is shown that CO(2) and NH(3) desorption can be described by Fick's law, which describes desorption of a gaseous compounds from water as a first order process with respect to the degree of oversaturation, which is the driving force of the process. An experimental investigation was carried out to determine the desorption rate constants. The value of the constant proved to be inversely proportional to the depth of the pond (H) and its value for H=1 m and at 26 degrees C was established as K(CO2)=0.34/H d(-1) for carbon dioxide and K(NH3)=0.33/H d(-1) for ammonium" |
| Keywords: | "Carbon Dioxide/chemistry Hydrogen-Ion Concentration Volatile Organic Compounds/*chemistry Waste Disposal, Fluid/*methods Water Purification/*methods;" |
| Notes: | "MedlineAlves, Eudes M Cavalcanti, Paula F C van Haandel, Adrianus eng England 2011/03/26 Water Sci Technol. 2011; 63(6):1177-82. doi: 10.2166/wst.2011.104" |
