Volatile Organic Compound Stripping at Clarifier Weirs
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.
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Document Type: Research Article
Publication date: 1999-09-01
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Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year. Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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