生物炭-硅酸钙联合修复铅镉污染土壤的持续性效应  

Remediation of lead-cadmium contaminated soil via continuous effect of combined biochar and calcium silicate

作　　者：苏梦贤 张磊[1] 周小平 寇萌 熊娟 汪明霞[1] 谭文峰[1] SU Mengxian;ZHANG Lei;ZHOU Xiaoping;KOU Meng;XIONG Juan;WANG Mingxia;TAN Wenfeng(College of Resources&Environment,Huazhong Agricultural University,Wuhan 430070,China)

机构地区：[1]华中农业大学资源与环境学院,武汉430070

出　　处：《农业资源与环境学报》2024年第2期473-481,共9页Journal of Agricultural Resources and Environment

基　　金：国家自然基金项目(42277299,41877030);湖北省自然科学基金项目(2020CFA013)。

摘　　要：为探究棕榈生物炭与硅酸钙联合施用对Pb-Cd复合重金属污染土壤的钝化效果及其稳定性,本研究采用蔬菜种植盆栽实验,测定土壤溶液pH和Pb、Cd浓度以及蔬菜可食部分Pb、Cd含量。结果表明:与不添加钝化剂的对照组相比,添加钝化剂能够有效提高土壤溶液pH,使土壤溶液中Pb、Cd浓度显著降低,种植小白菜可食部分Pb含量下降62.20%~96.77%、Cd含量下降92.76%以上,多数处理符合国家食品安全标准。土壤种植适宜性研究结果表明,五种供试蔬菜可食部分重金属含量与富集系数规律一致,小白菜对Pb的富集能力最强,苋菜对Cd的富集能力最强。当土壤Pb<500 mg·kg^(-1)时,韭菜、苋菜、甘蓝和大白菜四种蔬菜均可种植;当土壤Cd>0.6 mg·kg^(-1)、Pb>500 mg·kg^(-1)时,不适宜种植上述五种蔬菜。本研究探明了钝化剂的持续修复效果,研究结果可为土壤修复提及中低污染风险地区的适宜蔬菜种植提供技术和数据支撑。This study evaluated the remediation effect and stability of palm biochar combined with calcium silicate on lead-cadmium(Pb-Cd)co-contaminated soil,by determining the pH,Pb content,and Cd content in soil solution and edible parts of vegetables in pot experiments.The results demonstrated that compared with the control,addition of a passivation agent could effectively increase the pH value,and substantially reduced the Pb and Cd content in soil solution,and in the edible part of Chinese cabbage by 62.20%–96.77%and 92.76%,respectively.Most of the Pb and Cd contents in the edible part met the National Food Safety Standards(GB 2762-2022)after soil remediation.The results of planting suitability analysis revealed that there were consistent trends of heavy metal concentration in the edible parts and enrichment coefficients of the five tested vegetables.Chinese cabbage and amaranth had the strongest accumulation ability for Pb and Cd,respectively.Soil with Pb<500 mg·kg^(-1),was more suitable for planting Chinese chives,amaranth,cabbage,and Chinese cabbage;whereas soil with Cd>0.6 mg·kg^(-1) and/or Pb>500 mg·kg^(-1),was not suitable for planting any of the five vegetables.This study proves that the continuous remediation effect of the passivator provides technical reference for soil remediation,as well as suggestions for suitable vegetable planting in low-medium pollution risk areas.

关 键 词：土壤复合污染 铅 镉 棕榈生物炭 硅酸钙 

分 类 号：TQ421[化学工程] X53[环境科学与工程—环境工程]