速生桉树叶处理Cr(Ⅵ)离子废水的前处理实验探究.pdfVIP

速生桉树叶处理Cr(Ⅵ)离子废水的前处理实验研究 姚秋艳，唐艳葵，张寒冰，刘雯 (广西大学 环境学院，广西 南宁 530004) 摘要：当前用于处理低浓度含Cr(Ⅵ) (100 mg.L-1)废水的化学方法等传统方法存在效率低或成本高等不足之处，生物吸 附法成为近年来研究的热点。本论文对林业废弃物—速生桉树叶生物吸附去除含Cr(Ⅵ)废水进行研究，探索实验研究烘 干温度、粒度、烘干时间、鲜度等前处理因素对处理模拟Cr(Ⅵ)废水效果的影响，通过正交实验得出最佳前处理工艺。 单因素实验结果表明：粒度越小越利于提高 Cr(Ⅵ)废水处理效果；75 ℃和 105 ℃烘干温度为最佳烘干温度；105 ℃下 烘干时间90 min 为最佳烘干时间。正交实验分析得出，影响速生桉树叶去除Cr(Ⅵ)效果的前处理因素依次为：粒度＞ 烘干时间＞烘干温度；影响速生桉树叶对总铬的吸附主要前处理因素主次：粒度＞烘干温度＞烘干时间。最佳前处理工 -1 反应时间为120 min 的条件下，对50 mg·L-1 含Cr(Ⅵ) 离子模拟废水去除率达100%， 艺：在室温（27 ±2 ℃），120 r·min 总铬吸附率达50.52% 。由实验结果可知：速生桉树叶因其具有强还原性活性基团，有利用其处理含Cr(Ⅵ)废水的潜力。 关键词：Cr(Ⅵ)离子；废水；生物吸附剂；前处理 中图分类号：X703 文献标识码：A The removal of Cr(Ⅵ) from aqueous solutions by fast-growing eucalyptus leaves as a natural biosorbent Yao Qiuyan, Tang Yankui, Zhang Hanbing, Liu Wen (College of Environmental Engineering, Guangxi University, 530004 Nanning, China) Abstract: As is known to all ,It is very expensive and ineffective to remove Cr (Ⅵ) from wastewaters using -1 conventional methods such as chemical method when the initial concentration is low (100 mg•L ). In recent years ,the method of biosorption is becoming the research highlight. In this paper, it studies the effects of pretreatment of fast-growing eucalyptus leaves on Cr(Ⅵ) removal from aqueous solution. The effects on Cr(Ⅵ) adsorption of preparation factors which are dried temperature, the granularity, dried time and freshness were studied through single factor experiments. And the best pretreatment condition is obtained through orthogonal experiment.The experimental result indicates: smaller granularity can increase the treatment effect; 75 ℃ and 105℃ are the best dried temperature; 60 min is th