The methane stripping test unit comprised of four identical reactors, each constructed from a standard wheeled bin. Each reactor contained a coarse aeration device in the base, that allows air to bubble through the contents at a rate which can be controlled and measured.
Leachate was pumped into the first chamber, by means of twin electric pumps, directly from a leachate sump at the landfill, and flow rate was determined accurately using a large measuring cylinder and stopwatch.
Effluent from chamber 1 overflows into chamber 2, and passes through the system in a similar manner, finally flowing by gravity into an effluent tank, from where it is pumped to discharge by a low level-controlled pump. When all of the chamber lids are closed, the concentration of methane in ‘off-gas’ from each individual chamber, can be determined, by testing the flow of gas within a horizontal vent in the lid of each reactor.