HOK® Activated Lignite is a sorbent for effective waste gas and wastewater treatment. It is manufactured by activating our local lignite in a rotary hearth furnace process. This produces high-quality activated lignite, which has proved itself as a cost-effective sorbent and filter material in environmental technology.

HOK® Activated Lignite, made from Rhenish lignite, is significantly different from most types of activated carbon both in the way it is manufactured and as regards of its characteristics. Lignite mined from RWE Power AG’s opencast mines near Cologne is activated using the rotary hearth furnace process (called ‘Herdofen’ in German), which gives the product its brand name ‘HOK®’.