The CODCr level in the raw wastewater is high to 1000 mg/l, the CODCr removal ratio of 30% by bio-membrane process alone was gained formerly.

• 制浆造纸废水对环境的污染危害以化浆系统洗、选、漂工段排出的混合废水(亦称造纸中段废水)最为严重。