Residence Time

The residence time of a gaseous pollutant in a biofilter (t), given by the ratio of the empty bed volume of the filter (Ve) to the waste-gas flow rate (Qg), is a fundamental parameter that cannot assume values smaller than a critical level if satisfactory removal efficiencies are desired. However, due to the difficulty in estimating empty-bed volume, residence time is often referred to total-bed volume. According to the pollutant degradability, this parameter typically ranges between 15 and 60 s. For liquid pollutants it is necessary to take into account their partition coefficients between liquid and gaseous phases.

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Brew Your Own Beer

Discover How To Become Your Own Brew Master, With Brew Your Own Beer. It takes more than a recipe to make a great beer. Just using the right ingredients doesn't mean your beer will taste like it was meant to. Most of the time it’s the way a beer is made and served that makes it either an exceptional beer or one that gets dumped into the nearest flower pot.

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