Our Lava Rock (pumice) is used extensively throughout the UK and Europe as a biofiltration media in the treatment of odours emanating from sewage treatment works, wastewater treatment works, industrial processes and industrial effluentsboth municipal and industrial applications.
Biofiltration is a technique for the elimination of malodorous gas emissions such as hydrogen sulphide (H2S), mercaptans and volatile organic compounds (VOCs).
A biofilter or bioscrubber (often called a packed tower) is an air filtration system where contaminated gases are treated inside a tower. The biofilter contains lava rock onto which microorganisms attach. These microorganisms create a biofilm on the lava rock which during biofiltration absorb the contaminants contained within the gas. The microorganisms degrade the pollutants, with the treated gas vented to the atmosphere.
The gas can be pumped into the biofilter either concurrent or counter current, with the control of the systems pH either by the addition of caustic soda or by the replacement of the re-circulating liquors