Active Source

Overview

An active source means to have a defined gas flow emitted from a source. As an example, both a biofilter or an aerated pond are both active sources. According to VDI3880, an active source is defined by an average flow velocity of 30m/h or greater over the area of the source. Active sources can be sampled using a sampling hood.

See also: Odour Source, for how this fits with the other source classifications.

See also: Composting Odour, for how enclosed, mechanically ventilated composting systems are treated as an active source.