The Influence of Stock Consistency on the Pollution Load in Washing Process

BioResources

Youming Li¹  Qihui Sun²  Lirong Lei²  Tiantian Chen³  Mingzhu Hong³  Yi Hou⁴ 

[1] China South China University of Technology;China;South China University of Technology;State Key Laboratory of Pulp and Paper Engineering ,South China University of Technology, Guangzhou 510640, China;

关键词: Stock consistency;    Washing process;    Lignin;    Bleaching process;    Pollution load;   

DOI  :  10.15376/biores.11.1.2214-2223

来源: DOAJ

【 摘 要 】

The influences of stock consistency on the kappa number, residual alkali of pulp, flow direction of lignin, chemical oxygen demand, oxidation with dichromate (CODCr), and five-day biochemical oxygen demand (BOD5) in effluents were investigated in a washing process. Compared with 15% stock consistency, 35% stock consistency could lead to a decrease of at least 25% in the consumption of washing water while cutting 75.27% and 46.29% of CODCr and BOD5 in washing effluents, respectively. Moreover, the residual lignin in effluents were reduced greatly from 39.35 g·t-1 to 12.76 g·t-1, which will be beneficial to treatment of washing and bleaching effluent. All the results showed that a higher stock consistency in the washing process could decrease the consumption of washing water, the generation of pollution, and the toxicity in bleaching effluent.

【 授权许可】

Unknown