Pollution Scrubbing Products
Needham Chalks Environmental Chalk is a screened granular chalk, typically in the 10 to 20mm size range. which has been developed to meet a growing market for the absorption of environmentally harmful components of flue gas emanating from power stations brick works and other industrial processes.
In simple terms the chalk is put into trays which form part of the flue structure.
Flue gases pass through the porous structure of the chalk and the harmful components are absorbed in to the chalk which will ultimately becomes saturated with contaminant and has to be replaced from time to time. The net effect is that atmospheric emissions are much improved.
Given the very absorbent nature of East Anglian chalk it is possible to achieve considerable emissions improvements in some applications whereby powdered chalk is mixed in with the combustion fuel, such as biomass, to absorb harmful gaseous components at the grate rather than in the flue. Using this method the contaminated chalk simply becomes part of the ash stream.