制浆造纸废水处理及中水回用工程实例

Practical Case of Wastewater Treatment and Recycling of a Paper Mill

关键词:  制浆造纸  废水处理  中水回用

Key Words:pulping and paper  wastewater treatment  reuse of reclaimed water

摘要:国内某新建造纸企业配套废水处理站设计规模60000 m³/d，废水处理采用预处理+好氧生物处理+混凝沉淀+Fenton氧化处理工艺，出水COD_Cr≤50 mg/L，SS≤13 mg/L，直接进入后续中水回用单元；中水回用单元采用预处理+超滤反渗透工艺进行处理，反渗透出水COD_Cr≤10 mg/L，TDS≤180 mg/L，系统中水回收率70%，脱盐率97%。回用水送至厂区原水池，为企业新增用水源1512万m³/a，约占企业总用水量的50%，极大地缓解了企业用水压力。

Abstract:The scale of wastewater treatment station in the paper mill was 60000 m³/d. The wastewater treatment adopted the process of pretreatment + aerobic biological treatment + coagulation sedimentation + Fenton oxidation，and the effluent (COD_Cr≤50 mg/L and SS≤13 mg/L) was subsequently treated by the process of pretreatment + ultrafiltration reverse osmosis process in order to implement recycling. The COD_Cr of produced water from reverse osmosis was less than 10 mg/L and TDS was less than 180 mg/L. The system recovery rate was 70% and the desalination rate was 97%. The recycled water was sent to the original water pool of the plant, which provided 15.12 million m³ of water per year to the enterprise, accounting for about 50% of the total water consumption of the enterprise, greatly alleviating the pressure of the enterprise's water supply.