The Roles of Physical and Chemical Sorption in the Reduction of Odorous Reduced Sulfur Emissions from Kraft Pulp Mills Using Green Liquor Dregs

摘要

Using traditional technologies to decrease the reduced sulfur gases that give kraft pulp mills their characteristic odor to levels undetectable by the human nose would be a financial burden on the mill with no return on investment. Recent studies have shown green liquor dregs to have promise as a cheap, readily available sorbent for such a purpose. Laboratory experiments have shown that a packed bed of dregs can reduce hydrogen sulfide and methyl mercaptan concentrations to undetectability continuously for extended periods. A mill trial has verified results, and a mechanism for removal is under investigation.