絮凝法深度处理造纸废水

A Study on Advanced Treatment of Paper Mill Effluent by Different Flocculants

采用新型废水处理剂Fe2＋配合物，预处理二沉池出水，然后分别用聚丙烯酰胺（PAM）、Al2（SO4）3、聚合氯化铝（PAC）三种絮凝剂进行絮凝处理。通过检测废水的COD和色度等指标，结果发现聚合氯化铝效果最佳。确定最优条件为：废水pH值6～7，聚合氯化铝的投放量为200mg·L-1，沉降时间3h。最终出水COD可降至85mg·L-1，色度为32倍。达到了《制浆造纸工业水污染物排放标准》（GB3544—2008）的排放要求。聚合氯化铝用于造纸废水深度处理效率高、成本低、绿色环保，具有很好的应用前景。

The new type waste water treatment agent Fe2＋ complexes was used to pretreat the effluent water in secondary clarification pond, and then the water was flocculated by polyacrylamide （PAM）, Al2（SO4）3 and PAC respectively. By detecting the CODc, and colority, it was found that the PAC can reach the best effect, and the optimal condition of the wastewater treatment are as follows： pH at about 6 - 7,200 mg·L-1 of PAC and sedimentation time 3 h. At these conditions, the ultimate CODCr was 85mg·L-1, colority was 30 times, which can meet the Discharge Standard of Water Pollutants for Pulp and Paper Industry （GB 3544- 2008）. The PAC is of high efficiency, low cost, and friendly environmental, it will be widely used in advanced treatment of paper mill wastewater.