I have measured concentrations of air pollutants emitted from a waste water tank.
I need to convert these concentrations from (mg/m3) to emission rates (g/s) to use in dispersion modeling.
I found several equations that need parameters I can't calculate such as flow rate (This parameter can be calculated for stack but I need to calculate it for a passive area source without any flow rate) .. pollutants emitted by aerosolization due to wind or evaporation.
How can I calculate the emission rates of pollutants from these tanks?
Not my field, but as you know you need some type of estimate of mass flow and possibly of diffusion rate. I hope a physicist can help!
You answered yourself the emission rate is g/second. So you have to correlate the volume (cubic meter to the time), how many m3 per time and divide the results by this time. (i.e. as Dr Paul said, you have to use the flow rate). Many factors can be considered, e.g. temperature, gas density and measurement temperature.
If it is from the wastewater surface, the emission rate may be calculated in g/m2/s using the close chamber technique. See, Hutchinson, G. L., Mosier, A.R., 1981. Improved soil cover method for field measurement of Nitrous oxide fluxes. Soil Sci. Soc. Am. J. 45, 311-316.
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