Abstract: In order to improve the treatment effect of paper-making wastewater, magnetic Fe₃O₄/chitosan composite microspheres have been used as flocculant. After the Fe₃O₄ particles, which were prepared by hydrolysis method, have been dispersed in chitosan solution, magnetic Fe₃O₄/chitosan composite microspheres can be prepared. The effects of the dosage of magnetic Fe₃O₄/chitosan composite microspheres, pH, stirring speed and sedimentation time on COD removing rate of paper-making wastewater are investigated. The results show that the COD removing rate can reach 83.38%, under the following conditions:pH is 8, stirring speed 120 r/min, dosage of composite microspheres 6 mg/L, sedimentation time 8 h, and the influent COD of paper-making wastewater 2549.41 mg/L.

Key words: magnetic Fe₃O₄, chitosan, paper-making wastewater

摘要： 为了提高对造纸废水的处理效果，采用磁性Fe₃O₄/壳聚糖复合微球作为絮凝剂对其进行处理。将水解法制备的Fe₃O₄微粒分散于壳聚糖溶液中，制备成磁性Fe₃O₄/壳聚糖复合微球，考察了其投加量、pH、搅拌速度及沉降时间对造纸废水COD去除率的影响。结果表明，在pH为8，搅拌速度为120 r/min，复合微球投加量为6 mg/L，沉降时间为8 h的条件下，当进水COD为2549.41 mg/L时， COD去除率可达到83.38%。

关键词: 磁性Fe₃O₄, 壳聚糖, 造纸废水

CLC Number: 

• X703.1