What is the most effective way to force the mixture of air and contaminant into a bench-scale biofilter?
The easiest is to have compressed air (lab air), and to use flow meters to regulate the air flow. If compressed air is not available, a diaphragm pump ($150) will work. Always have a spare diaphragm, since they wear off quickly, especially if the pump is used at a lower flow than what it is rated for. Maybe you can find a cheap aquarium air pump with a high enough flow rate.
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