絮凝法处理造纸废水的响应面优化

Optimization of Flocculant Process for Papermaking Wastewater Treatment with Response Surface Method

关键词:  絮凝剂  造纸废水  响应面法  工艺优化

Key Words:flocculant  papermaking wastewater  response surface method  process optimization

摘要:以广州某造纸厂废水为研究对象，利用造纸厂Fenton污泥制备得到的聚合硫酸铁（PFS）为絮凝剂，聚丙烯酰胺（PAM）为助凝剂，通过絮凝法对废水进行处理。采用响应面法探究了絮凝过程中PFS用量、PAM和PFS的体积比及处理温度对废水中化学需氧量（COD）去除率的影响。结果表明，絮凝法可以有效地降低造纸废水中的COD含量，响应面法优化得到的最佳工艺条件为：PFS用量1.04 mL/L，PAM和PFS体积比4.99，处理温度31.54℃。在最优条件下进行验证实验，造纸废水中COD_Cr的去除率为39.6%，与响应面法模型预测值（39.5%）接近。研究还表明，响应面法可科学地优化絮凝法对造纸厂废水中COD去除的处理方案，且能在较少试验次数下验证影响因素之间的关系。

Abstract:The papermaking wastewater from a papermaking factory in Guangzhou was treated by flocculation process， PFS prepared from papermaking factory Fenton sludge as flocculant， and the factors of dosage of PFS， volume ratio of PAM to PFS， reaction temperature on COD removal rate of papermaking wastewater efficiency were optimized with response surface method. The results showed that the flocculant process could effectively reduce the pollutant content in papermaking wastewater， the optimum conditions were optimized by response surface method as follows， dosage of PFS was 1.04 mL/L， PAM to PFS volume ratio was 4.99， temperature was 31.54℃. Under this condition， the COD_Cr removal rate of papermaking wastewater was 39.6%， which was consistent with the predicted value （39.5%） by the model equation. This results showed that the response surface methodology could test the interaction between the influencing factors in a small number of experiments， and successfully optimize general operation parameters in flocculant processes treating for papermaking wastewater.