文献类型：期刊文献

中文题名：麦饭石颗粒运动方式对Cr脱附性能的影响研究

英文题名：Effect of Maifan Stone Particle Movement Pattern on Cr Desorption Property

作者：孙荣江[1];侯峰[1];耿坤宇[1];杨强[1,2]

机构：[1]华东理工大学机械与动力工程学院,上海200237;[2]华东理工大学国家环境保护化工过程环境风险评价与控制重点实验室,上海200237

年份：2018

卷号：41

期号：5

起止页码：1

中文期刊名：环境科学与技术

外文期刊名：Environmental Science & Technology

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：上海青年科技启明星计划A类(16QA1401200);霍英东教育基金会青年教师基金(151077)

语种：中文

中文关键词：麦饭石;脱附;运动;Cr

外文关键词：maifan stone;desorption;movement;Cr

摘要：土壤洗脱技术在重金属污染修复中应用广泛,但是应用在小粒径黏土颗粒的脱附效果一般,传统脱附过程对污染颗粒运动方式及与脱附液接触方式研究甚少。因此,利用天然多孔材料麦饭石模拟土壤颗粒,利用搅拌点位不同以实现对颗粒运动方式(自转/公转)的研究,同时对脱附条件组合优化进行正交实验研究。另外,进行脱附动力学实验,并对脱附剂进行对比研究。实验验证了麦饭石具有良好的脱附性能,10 min基本能达到脱附平衡;比较不同脱附剂的脱附效果,柠檬酸对重金属脱附效果显著,相比于去离子水溶液提升近2.5倍,且是天然有机酸,生物降解性好;比较Cr污染土壤的自转、公转脱附性能的区别,适当提高线速度有利于提高脱附效率;以及研究脱附条件的优选比较实验,得到了最佳组合为:水热温度60℃、颗粒转速200 r/min、搅拌时间60 s、脱附液浓度0.1 mol/L。
Soil washing technology is widely used in heavy metal polluted soil remediation, but the effect of being used in small size clay particle is not very high. The traditional desorption process has little research on the contaminated particles movement pattern and the contact mode with the desorption liquid. Therefore, natural porous material（maifan stone） is used to simulate soil particles, by changing the stir position to achieving the different particle movement pattern（rotation/revolution）,while the desorption conditions are studied by orthogonal optimization. In addition, the desorption kinetics experiments are carried out and the desorption agents are compared. The experimental results show that the maifan stone has good desorption properties, and nearly 10 min can basically reach desorption equilibrium; Compared with the desorption of different desorption agents, the effect of citric acid on the removal of heavy metals is remarkable. Compared with deionized water, the removal of citric acid is nearly 2.5 times, and it is a natural organic acid with good biodegradability. Compared the rotation and revolution of Cr polluted soil, appropriately increasing the linear velocity is conducive to improve the desorption efficiency. And the best desorption conditions of different factors are studied, and get the best combination is water temperature 60 ℃, particle speed 200 r/min, stirring time 60 s, desorption liquid concentration 0.1 mol/L.