Solving Environmental Problems Caused by the Pulp and Paper Enterprises via Deodorization and Dehydration of Sludge Lignin

Paper reviews the method of deodorization and dehydration of sludge-lignin, which is based on the interaction of sludge-lignin with quicklime. CaO added to the sludge-lignin neutralizes lignin in the amount of around 15–20% and within 8–12 days binds volatile sulfur-containing components, functional organic groups and water. The proposed method can effectively reduce unpleasant odor to the level of 2–3 points based on a 5-point scale, as well as to diminish the humidity of the end product by 45–50%, making it look as a free-flowing powder, convenient for transportation and further use. Sludge lignin neutralized by the quicklime can be used for land recycling of municipal solid waste, as well as for other purposes. The recycling technology is characterized by the simple instrumental and the use of the inexpensive chemical reagent. The high economic efficiency of this method makes it promising for solving environmental problems of the ‘Baikal Pulp and Paper Mill’.