05boxmodel.big

05boxmodel.big - Resuspension Sinks: removal processes...

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1 Box Model • Introduction • Steady-state Box Model Formula • Application to Pollution Control
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2 Box Model, Reservoir Model, Budget Model A defined system receives something (input or source) and simultaneously has this stuff removed (output or sink). Steady-state: when the source rate = sink rate, resulting in a constant amount or concentration of material inside the box
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3 Source rate = Sink rate
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4 Source rate > Sink rate
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5 Steady-state Box Model Concentration S S q V V = volume of box S = source rate = sink rate at steady-state τ = residence time (“ tau”) q = steady-state concentration of pollutant in the box q = S V
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6 Air Pollution Sources and Sinks • Sources: origin of pollution Direct emission Winds Chemical processes
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Unformatted text preview: Resuspension Sinks: removal processes Winds Chemical processes Deposition 7 Residence Time = average period of time a molecule of an air pollutant stays inside a box before it is removed by some sink process Controlled by sinks: More efficient sink process smaller residence time 8 Pollution Control Analysis Decreasing S Easy to eliminate source or decrease source rate Decreasing Somewhat more difficult to add more sink processes or increase sink efficiency Increasing V Most difficulthow does one add on volume? Reduction of ambient, steady-state air pollution concentration achieved by:...
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This document was uploaded on 09/03/2009.

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05boxmodel.big - Resuspension Sinks: removal processes...

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