Resource Recirculation of Black Liquor from Paper Mills——A New Treatment Way of Black Liquor of Wheat Straw Alkaline Pulp

Wheat straw alkaline pulp from paper mills with an annual output bellow 10 000 t pollutes surface water seriously. The government has formulated many management policies to limit the productivity of the mills and has done much work to treat the black liquor. A new technique for treating the black liquor is introduced. It has three advantages: little investment, high attached value, and thorough treatment. The popularization and application of this technique will play an important role in water resources protection and water pollution prevention.