其他题名Optimization of cadmium removal from and speciation in contaminated brown soil using citric acid
杨帅1,2; 李远1,2
; 涂晨1,2; 司绍诚1,2; 朱侠1; 贠豪1,2; 李连祯1,2; 骆永明1,2,3发表期刊环境科学学报
ISSN0253-2468
2021
卷号41期号:7页码:2868-2876
关键词棕壤柠檬酸土壤修复淋溶镉
研究领域Environmental Sciences & Ecology
英文摘要This study aims to investigate the effect of citric acid on cadmium leaching and chemical forms in soil and to develop a combined dissolutionleaching- drainage system for the in-situ removal of cadmium (Cd) from agricultural soil.The optimal leaching parameters (citric acid concentration,solidliquid ratio,leaching time,reaction time and leaching method) using citric acid as an environmentally friendly leaching agent was determined using batch experiments.We developed a leaching bottle and integrated leaching and drainage box to simulate the in-situ removal of Cd from soil and to verify the optimal parameters from batch experiments.The Cd in the collected leachate was removed by flocculation with CaO.The mobility and availability of Cd in soil were assessed by the BCR sequential extraction method.The results show that the removal rate of Cd reached 81.3% under optimal parameters (0.3 mol·L~(-1) citric acid,1∶1.5 solid-liquid ratio,6.0 h contact time and 3 times continuous shaking).The citric acid-water sequential leaching effectively removed 78.0% of Cd through the integrated leaching-drainage box and 95.6% of Cd in the leachate was removed by CaO flocculation.The removal percentages of Cd in the acid-extractable,reducible,oxidizable and residual fractions were 83.0%,70.3%,44.0% and 25.0%,respectively.The results show that the combination of leaching,drainage and flocculation can effectively remove Cd from contaminated soil and prevent leachate pollution.Further research is required to further explore the methodology under field conditions.
中文摘要针对农田土壤重金属污染,研究了有机酸对土壤中镉的去除条件优化及结合形态的影响,旨在发展一种环境友好、可原位且永久去除土壤中镉(Cd)的淋溶暗排联合净化方法.采用环境友好型淋溶剂柠檬酸,通过批试验确定淋溶最佳参数(柠檬酸浓度、固液比、淋溶次数、淋溶时间和淋溶方式).同时,将自行设计的淋溶瓶和淋溶暗排箱用于批试验最优化参数验证和原位土壤中Cd清除模拟,用CaO絮凝法除去收集暗排废液中的Cd,并通过BCR连续提取法评估土壤中Cd的迁移性和有效性.结果表明,通过柠檬酸的连续分批浸提,使用0.30 mol·L~(-1)柠檬酸以1 g ∶1.5 mL的固液比连续3次、6 h振荡浸提对土壤中总Cd的淋溶去除率可达81.3%.通过淋溶暗排箱试验,经柠檬酸-水梯度淋溶可有效去除78.0%的Cd,暗排液经CaO絮凝可去除95.6%的Cd;柠檬酸对弱酸提取态、可还原态、可氧化态及残渣态Cd的淋溶去除率分别为83.0%、70.3%、43.9%和25.0%.研究表明,采用淋溶暗排和CaO絮凝的联合方法可快速去除污染农田土壤中的Cd并避免暗排液二次污染.后续研究需进一步扩大试验规模并开展野外验证试验.
文章类型Article
资助机构国家自然科学基金重大项目; 国家重点研发计划项目
收录类别CSCD
语种中文
CSCD记录号CSCD:7009481
引用统计
文献类型期刊论文
条目标识符http://ir.yic.ac.cnhttp://ir.yic.ac.cn/handle/133337/30270
专题中科院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
作者单位1.中国科学院烟台海岸带研究所,中国科学院海岸带环境过程与生态修复重点实验室,山东省海岸带环境过程重点实验室,烟台264003;
2.中国科学院大学,北京100049;
3.中国科学院南京土壤研究所,中国科学院土壤环境与污染修复重点实验室,南京210008
推荐引用方式
GB/T 7714杨帅,李远,涂晨,等. 柠檬酸对污染棕壤中镉的去除优化及结合形态影响[J]. 环境科学学报,2021,41(7):2868-2876.
APA杨帅.,李远.,涂晨.,司绍诚.,朱侠.,...&骆永明.(2021).柠檬酸对污染棕壤中镉的去除优化及结合形态影响.环境科学学报,41(7),2868-2876.
MLA杨帅,et al."柠檬酸对污染棕壤中镉的去除优化及结合形态影响".环境科学学报 41.7(2021):2868-2876.
PDF全文下载地址:
点我下载PDF
