改性淀粉絮凝剂的制备及其在造纸废水处理中的应用  

Preparation of Modified Starch Flocculant and Its Application in Paper Mill Wastewater Treatment

作　　者：廖益强 卢泽湘[1] 郑德勇[1] 林铭[1] 魏起华[1] 张慧[1] 谢拥群[1] 

机构地区：[1]福建农林大学材料工程学院,福建福州350002

出　　处：《中国造纸学报》2015年第2期34-38,共5页Transactions of China Pulp and Paper

基　　金：福建省教育厅资助项目(JA09068;JB13036;6112c07a7);福建省自然科学基金资助项目(2014J01069;K55NI946A);国家级大学生创新创业训练计划项目(201310389024;201410389024)

摘　　要：以玉米淀粉和丙烯酰胺为原料、硝酸铈铵为引发剂,通过接枝共聚反应对淀粉进行改性,合成了淀粉/丙烯酰胺接枝共聚物（SAM）,即改性淀粉絮凝剂。将合成的SAM絮凝剂用于造纸废水絮凝处理,讨论了SAM絮凝剂用量、废水的温度和p H值等因素对处理效果的影响。研究显示,在丙烯酰胺与淀粉质量比为2∶1、引发剂浓度2.0 mmol/L、反应温度40℃、反应时间3 h、反应体系p H值4.0的条件下,SAM絮凝剂合成反应的接枝率达到68.5%;红外光谱分析表明丙烯酰胺成功接枝在玉米淀粉基质中。将SAM絮凝剂用于处理混合造纸废水,当SAM絮凝剂用量为12 mg/L、废水p H值7-9、温度30℃条件下,CODCr去除率为88.4%,浊度去除率为91.2%,BOD5去除率为85.5%,处理后废水透光率为93.3%。By chemical grafting method, using corn starch and acrylamide as raw material, cerium ammonium nitrate as initiator, starch/ac- rylamide copolymer （SAM） flocculant was synthesized. Its surface functional groups were analyzed by infrared spectrum concerning its application in wastewater treatment, the influencing factors such as dosage of SAM, wastewater temperature, pH value of wastewater were investigated. The results showed that grafting rate of the starch reached a maximum value 68.5% when acrylamide and starch mass ratio was 2： 1, concentration of initiator was 2. 0 mmol/L, reaction temperature was 40℃, pH value of the reaction system was 4. 0. IR spectrum analysis indicated that acrylamide was successfully grafted onto the starch matrix. The appilication experimental results showed that CODCr removal efficiency of wastewater was 88.4%, BODs removal efficiency was 85.5% , removal rate of turbidity was 91.2%, and transparency of the treated wastewater was 93.3% when dosage of SAM was 12 mg/L, temperature was 30℃, the pH value was 7 -9.

关 键 词：改性淀粉 絮凝剂 造纸废水 接枝共聚 

分 类 号：TQ314.253[化学工程—高聚物工业] X793[环境科学与工程—环境工程]