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Volatile Organic Compound Stripping at Clarifier Weirs
Author(s) -
Zytner R.G.,
Rahmé Z.G.,
Corsi R.L.,
Labocha M.,
Parker W.
Publication year - 1999
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143097x121988
Subject(s) - clarifier , wastewater , weir , stripping (fiber) , mass transfer coefficient , mass transfer , sewage treatment , volatile organic compound , environmental engineering , environmental science , air stripping , clean water , effluent , waste management , chemistry , chromatography , materials science , engineering , geography , cartography , organic chemistry , composite material
Volatile organic compound (VOC) stripping at clarifier weirs was investigated for both clean water and primary wastewater using a pilot‐scale model with a cross‐sectional geometry similar to clarifier weirs. Drop height, type of flow regime over the weir, and weir shape were identified as important parameters influencing mass transfer. It was also observed that VOC stripping from free‐fall flow could be correlated with Henry's law constant. A model that accounts for liquid‐ and gas‐phase mass transfer was developed to predict VOC stripping from clean water. The relatively low and consistent gas‐ and liquid‐phase mass‐transfer coefficients used in the model suggest that a representative value may apply for all weir conditions. Incorporating a transition coefficient between clean water and wastewater made it possible to predict VOC transfer in primary wastewater based on clean water data. Experimental results and modeling efforts described in this paper could serve as a first step in estimating VOC emissions for flows over clarifiers at wastewater treatment plants.