Influence of Residual Black Liquor in Pulp on Wastewater Pollution after Bleaching Process
Tiantian Chen,
Youming Li,
Lirong Lei,
Mingzhu Hong,
Qihui Sun,
Yi Hou
Affiliations
Tiantian Chen
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; China
Youming Li
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou 510640, China; China
Lirong Lei
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; China
Mingzhu Hong
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; China
Qihui Sun
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; China
Yi Hou
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China; National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou 510640, China; China
The influence of residual black liquor in pulp on wastewater pollution after the bleaching process was studied. The results show that the CODCr in bleaching effluent has a remarkable linearity with bleaching loss of pulps without residual black liquor. For pulps with some residual black liquor, more than 34% of the overall CODCr is produced by the residual black liquor. It follows that more effective washing to reduce the residual black liquor is an appropriate way to control the pollutant discharges from pulp and paper mill industry.
