环境工程学报2018，Vol.12Issue(3)：904-913,10.DOI:10.12030/j.cjee.201709098
化学淋洗与生物质炭稳定化联合修复镉污染土壤
Chemical leaching combined with biochar stabilization remediate cadmium contaminated soil
摘要
Abstract
In order to identify the influence of soil leaching method combined with the biochar stabilization on cadmium (Cd) contaminated yellow-brown soil remediation,the soil leaching experiments,the method of BCR sequential chemical extraction and the one-step extraction by CaCl2 were performed to select out the best solution for soil leaching.After that,the efficiency of chemical washing on soil Cd bioavailability was compared with the combined technique of soil leaching and the biochar stabilization.Results showed that the washing efficiency of three eluent agents is listed in turn as EDTA-2Na＞HCl＞citric acid.The best leaching method is under the condition of 0.12 mol·L-1 EDTA-2Na,the soil-liquid ratio of 1 ∶ 4,and 3 h of vibration leaching.The Cd extraction ration is nearly 81.3％.After washing,the percentage of available Cd in soil reduced by 51.0％.Thus the leaching method significantly decreased the soil total heavy metal contents and their environmental risk in soil.Compared with the leaching remediation method solely,we used the method of EDTA-2Na leaching (Vaddition/Voptimal =80％) combined with 3％ corn-straw biochar (15 d stabilization) for soil Cd remediation.We reduced the soil available Cd contents (CaCl2-Cd) from 8.13 mg·kg-1 to 0.42 mg·kg-1.In conclusion,the combination of soil leaching method with biochar stabilization is effective in reducing the ecological environment risk of heavy metal contaminated soil,and is useful in improving the soil quality.关键词
淋洗修复/镉/玉米秸秆炭/养分元素/生物有效性Key words
leaching remediation/cadmium/corn-straw biochar/nutrient elements/bioavailability分类
资源环境引用本文复制引用
李明,程寒飞,安忠义,王浩,项萌,汪宜敏..化学淋洗与生物质炭稳定化联合修复镉污染土壤[J].环境工程学报,2018,12(3):904-913,10.基金项目
江苏省自然科学基金资助项目(BK20160155) （BK20160155）
