再生纤维制浆造纸废水处理及回用

Study on Treatment and Reusing of Wastewater of Recycled Fible Pulp Papermaking

指出了制浆造纸原料的短缺和造纸废水对环境的污染问题是制约我国制浆造纸行业发展的最主要因素,废纸已成为一种不容忽视的资源。设计针对天津广聚源纸业有限公司再生纤维造纸废水,设计了日处理量10000m3的废水处理及回用系统,确定了处理流程、计算了各部分构筑物的规格大小。并且进行了实验室模拟实验,选择了最佳絮凝剂(PAC)以及确定其最佳用量为500×10-6,对处理过程中pH值、搅动时间、搅动速度、PAM加入量等影响因素进行了实验分析探讨。结果得出:当pH值=6、搅动时间为0.5min、搅动速度为180r/min、PAM加入量为20×10-6时取得最佳效果,在此条件下处理的废水色度降低到45.6c.u.,浊度降低为2.17NTU,基本上满足部分生产需求可以回用。另外,为了得到一部分清水,设计了UASB+SBR方法对絮凝后1200m3/d的废水进行生物处理,处理后废水的COD去除率达60%以上,满足生产用水水质要求,可以回用。

This paper pointed out that the environment problem caused by the shortage of pulping and papermaking raw material and the pollution of papermaking wastewater were the main factors of current constraints to China＇s pulp and paper industry development. Waste paper is already a resource that can not be ignored. The design, aimed at the wastewater of recycled fiber papermaking of Tianjin Guangjuyuan Paper Ltd. , put forward a daily wastewater treatment and reuse system with processing capacity of 7500 m^3. In this process, we designed a reasonable processing method and calculated the structure size. And we carried out a simulation experiment in laboratory, chose the best flocculant （PAC） and determined its optimum dosage of 600ppm, analyzed the influence factors of pH, stirring time, stirring speed, the amount of PAM added. As the result, when the pH=6, stirring time was 0.5min, stirring speed was 180rpm, PAM accession for 20ppm achieved the best result. In this condition the original of treated wastewater was reduced to 45.6c. u. ,and turbidity reduced to 2.17NTU, which basically met the production demand and could be reused. In addition, in order to get a part of clean water, we designed the wastewater biological treatment by a UASB＋SBR method on the 1200 m3/d treated wastewater. The COD removal rate was above 60%, which met the water quality requirements and could be reused.