MINIMUM-COST BIOFILTERS FOR REDUCING ODOURS AND OTHER AERIAL EMISSIONS FROM LIVESTOCK BUILDINGS .1. BASIC AIRFLOW ASPECTS

摘要

The pressure drop per unit depth (Delta P Pa/m) across seven potential minimum-cost biofilter media was determined at different moisture contents for superficial air velocities (u) between 0.03 and 0.13 m/s in pilot scale biofilters, and fitted to the equation Delta P = au(b) where a and b are constants. Mean values of a ranged from around 200, for pure heather, to around 6000 for a peat-heather mixture. Mean values of b ranged from 1.20, for coir, to 1.69 for softwood chips of over 75 mm screen size.