Operational monitoring of Glomma – emissions from Borregaard Ind. Ltd.

Summary

Previous studies have shown that the emissions of readily available organic matter from Borregaard have caused a proliferation of the filamentous bacterium Sphaerotilus natans in the lower part of Norways largest river Glomma. The bacterium covers bottom sediments, and as a result, the exchange of oxygen between the open water and sediments decreases. Former reports have revealed declined densities of fish in key spawning and nursery areas and benthic fauna composition indicating organic enrichment. Studies that have been conducted in the area indicate that good ecological status will not be achieved unless further reductions of emissions of organic matter are implemented. In 2013, Borregaard installed an anaerobic treatment plant to reduce emissions of readily available organic matter to the River Glomma, and in June 2013 the plant was fully operative.