Technical Bulletin No. 0956: Emissions of Reduced Sulfur Compounds and Methane from Kraft Mill Wastewater Treatment Plants

A spatial ambient air sampling technique was used to quantify emissions of four reduced sulfur compounds (hydrogen sulfide, methyl mercaptan, dimethyl sulfide, and dimethyl disulfide) and methane from the various components of wastewater treatment plants at six kraft mills. Components tested included primary clarifiers, primary settling ponds, spill ponds, aerated basins, activated sludge treatment reactors, and post-aeration retention ponds. Concurrent liquid sampling was conducted, and relevant process information was gathered.