Abstract
The fundamental reason for the environmental pollution caused by the papermaking industry is the inadequate treatment of the black liquor. How to dispose of the lignin macromolecules, which is the main pollutants in the black liquor, is the key to addressing the environmental pollution. At present, cross-flow membrane filtration is one of the effective ways to retain and recycle lignin macromolecules in black liquor. The paper proposes the adoption of a dynamic blade cross-flow membrane filtration equipment provided by German BOKELA company to treat papermaking black liquor. The experiment shows that when the black liquor is treated with dynamic blade rotation cross-flow, the membrane with a molecular weight cut-off of nanofiltration (NP010) delivers the best retaining effect, with 28 % more lignin in black liquor than that in untreated black liquor. Meanwhile, when the blade rotational speed reaches 300 rpm and the transmembrane pressure is 0.5 or 2 bar, the flux of black liquor through nanofiltration NP010 is relatively desirable.
Funding statement: Also extend thanks to the Fund Project (2019GHY112040) for their support on finance.
Acknowledgments
The authors give sincere gratitude to Professor Wu Junfei and Professor Chen Fushan from Qingdao University of Science and Technology, Professor Hermann Nirschl and a fellow colleague Zihim Lam from the Karlsruhe Institute of Technology (KIT) for their academic assistance and help.
Conflict of interest: The authors declare no conflicts of interest.
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