摘要
目的合成可生物降解的炼焦废水絮凝剂-羧甲基淀粉(CMS),并对其絮凝效果进行研究。方法用ClCH2COOH对木薯淀粉(St)进行改性,采用乙醇作为溶剂,分两步合成CMS。结果实验结果表明,改性木薯淀粉较佳制备条件:nSt(M=162)∶nClCH2COOH=1∶1,nNaOH∶n(ClCH2COOH)=2.5∶1,碱化温度35℃,醚化温度50℃。获得改性木薯淀粉处理焦化废水工艺条件,在淀粉取代度为0.37,投入量为50 g/L废水,反应温度为40℃,搅拌时间为10 min,静置时间为30 min时,处理效果最好,对焦化废水浊度去除率高达79.5%以上。结论改性木薯淀粉对焦化废水浊度有明显降低效果,但用量大(50 kg/m3废水)和对于废水中的CODCr去除率低依然需要深入研究。
Aim To prepare a non-toxic and biodegradable flocculant-carboxymethyl starch （CMS）-to treat the eoking wastewater and analyze its flocculation effect. Methods Chloroacetic acid is used to modify cassava starch （St）. then carboxymethyl starch （CMS） is synthesized in two steps by using ethanol as solvent. Results The experimental results showed that the optimum conditions of CMS synthesis are as follows：nSt（M=162）：nClCH2COOH=1：1,nNaOH：n（ClCH2COOH）=2.5：1, alkalization temperature 35℃, etherification temperature 50 ℃, the degree of substitution of modified cassava starch was 0.37. The process of coking wastewater treatment was also investigated, the best results of over 79.5% turbidity removal rate was obtained with the modified cassava starch （50 g/L wastewater） at reaction temperature 40 ℃, stirring time 10 min and then standing time 30 rain. Conclusion Although modified cassava starch has the observable properties of reducing the turbidity and CODcr of the coking wastewater, its large consumption （50 kg/ma wastewater） and less removal rate of CODcr will require further study.
出处
《宝鸡文理学院学报（自然科学版）》
CAS
2009年第4期24-28,共5页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
基金
2008年福建省大学生创新实验计划项目(ZL0810/CS)
三明学院科学研究发展基金(B0706/Q)
关键词
羧甲基淀粉
取代度
木薯
絮凝效果
carboxymethyl starch
degree of substitution （DS）
cassava starch
flocculation
