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Legislative requirements for our flue-gas emissions and wastewater emissions are strict, putting high demands on our flue-gas and wastewater treatment processes.
We inject NH3 (ammonia) into the incineration chamber of the furnace to reduce emissions of NOx (nitrous gases) through the flue-gas stack.
We dose activated carbon into our filter bags to remove dioxins and other harmful substances. Fly ash is also trapped in the filter bags.
In a scrubber system, which consists of large containers with water spraying, all flue-gases are washed to remove, for example, HCl (hydrochloric acid), heavy metals, and SO2.
Sulphur precipitates as gypsum and is landfilled. Gypsum volumes amount to around 0.3 % of total waste input.
In 2008 Flue-gas treatment generated just below 20,000 tonnes of flue-gas treatment waste, which is exported to Norwegian NOAH, Norsk Affaldshåndtering.
Water from these flue-gas washing processes is led to our in-plant water treatment facility where it is neutralised, among others with lime, and cleaned for heavy metals and harmful substances. Then the water is led to a municipal wastewater treatment plant.
Sludge arising from wastewater treatment is mixed with fly ash and sent to landfill. This flue-gas waste fraction constitutes some 3 % of total waste input.
We continuously measure flue-gas flow, flue-gas temperature in different locations in the furnace, oxygen rate, water rate, CO contents, NOx, dust, SO2, and TOC (Total Organic Carbons).