采用絮凝法对橡胶促进剂CBS废水进行絮凝实验，考察了絮凝剂的选择、PAC质量浓度、pH、沉降时间以及温度对絮凝效果的影响，确定了利用PAC处理废水的最佳絮凝条件。结果表明，PAC质量浓度为1.2 g/L、pH为4、温度为40℃时，COD去除率可达70%。在最佳条件下，PAC与PAM复合絮凝剂处理橡胶促进剂CBS废水是可行的，COD去除率明显优于使用单一絮凝剂。在光学显微镜下观察发现，PAC絮凝形成的絮体与复合絮凝剂形成的絮体形态不同，因此复合絮凝剂的絮凝效果优于单一絮凝剂。当PAM质量浓度为6 mg/L时，沉降时间缩短为15 min，静沉比降至4∶92，COD去除率可高达82%以上，有效地解决了CBS废水难以生物降解的难题。

Flocculation experiments are performed on wastewater from rubber accelerator CBS production.Influences of the selection of flocculants,polyaluminum chloride (PAC) dosage,pH value,sedimentation time and temperature on the flocculation effect are investigated.The optimum flocculation conditions for wastewater treatment by PAC are confirmed as follows:1.2 g·L^-1 for mass concentration of PAC,PH=4 and temperature at 40℃.Under the optimum flocculation conditions,COD removal rate can reach 70%.The treatment of wastewater from rubber accelerator CBS by PAC/PAM composite flocculant is studied under the optimum conditions,which exhibits a significant better removal rate of COD than that by using single flocculant.It is found under an optical microscope that the form of floc formed by PAC flocculation is different from that of floc formed by composite flocculant.It is verified that the flocculation effect by composite flocculant is better than that by single flocculant.The sedimentation time is shortened to 15 min,sedimentation ratio drops to 4:92 and the removal rate of COD can exceed 82% when the mass content of PAM is 6 mg·L^-1.It overcomes effectively the difficulty in CBS wastewater biodegradation.