Desorption rate of volatile compounds in polishing ponds

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...

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Bibliographic Details
Published in:Water science and technology 2011-01, Vol.63 (6), p.1177-1182
Main Authors: Alves, Eudes M, Cavalcanti, Paula F C, van Haandel, Adrianus
Format: Article
Language:English
Subjects:
Acidity
Alkalinity
Ammonia
Ammonium
Ammonium compounds
Carbon dioxide
Carbon Dioxide - chemistry
Carbon dioxide removal
Constants
Desorption
Hydrogen-Ion Concentration
Photosynthesis
Polishing
Ponds
Rate constants
Removal
Volatile compounds
Volatile Organic Compounds - chemistry
Waste Disposal, Fluid - methods
Water Purification - methods
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Summary: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°C was established as K(CO2)=0.34/H d(-1) for carbon dioxide and K(NH3)=0.33/H d(-1) for ammonium.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2011.104