李文娟^1,,
王平²,
徐海音²,
朱姗姗²,
尹静玄²
1.中南林业科技大学生命科学与技术学院，长沙 410004
2.中南林业科技大学环境科学与工程学院，长沙 410004
基金项目: 基金项目湖南省重点研发项目（2016SK2030）
湖南省教育厅一般项目（湘财教指[2016]40号）

Effects of electrokinetic technology with different enhancing agents on cadmium removal and enzyme activity in soil

LI Wenjuan^1,,
WANG Ping²,
XU Haiyin²,
ZHU Shanshan²,
YIN Jingxuan²
1.School of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
2.College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China

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摘要:为了探讨基于不同增强剂的电动技术对重金属污染土壤的修复效果，采用0.1% 浓度的草酸、柠檬酸、已二胺四乙酸（EDTA）、甲基甘氨酸二乙酸（MGDA）作为阴极电解液，电压梯度3 V·cm-1连续通电10 d，同时考查土壤中Cd的电迁移效果以及土壤酶（脲酶、酸性磷酸酶、过氧化氢酶）活性的变化。结果表明：相对于传统电动法（清水组），增强剂明显提高了Cd在土壤中的迁移效果，且人工螯合剂效果优于有机酸，对总Cd去除率为MGDA（63.08%）＞EDTA（23.75%）＞柠檬酸（18.43%）＞草酸（16.41%）＞清水（8.73%）。相比于清水组，EDTA抑制了土壤中3种酶活性，柠檬酸、草酸可以改善脲酶和过氧化氢酶的活性，MGDA显著提高了3种酶的活性。结合Cd去除率和酶的影响分析，MGDA不仅能显著提高电动修复效率，且具备较低的土壤环境风险。
关键词: 电动技术/
土壤/
镉去除/
增强剂/
土壤酶活性

Abstract:Effects of different enhancing agents based electrokinetic technology for the remediation of heavy metals from contaminated soil were examined in laboratory-scale experiments. Enhancing agents at 0.1% (oxalic acid, citric acid, EDTA, MGDA) served as catholytes respectively, under a 3 V·cm-1 voltage gradient and electricity processing, the migration and removal of Cd and the activities of the enzymes (urease, acid phosphatase, catalase) in soil were studied concurrently. The results demonstrated that compared to the traditional group (without enhancing agents), addition of enhancing agents significantly accelerated the migration of Cd in the soil, and the effect of artificial chelating agents was better than that of organic acids. The total removal percentage of Cd was MGDA(63.08%)>EDTA(23.75%)>citric acid(18.43%)>oxalic acid(16.41%)>water(8.73%). Compared to the traditional group, EDTA inhibited 3 enzyme activities in soil. Citric acid and oxalic acid could improve the activity of urease and catalase. MGDA significantly increased the activity of 3 enzymes. Considering the analysis of Cd removal percentage and enzyme activity, MGDA could not only significantly stimulate the efficiency of electric repair, but also had lower soil environmental risks.
Key words:electrokinetic technology/
soil/
cadmium removal/
enhancing agent/
soil enzyme activity.

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刊出日期:2018-08-17

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不同增强剂的电动技术对土壤中镉去除及土壤酶活性的影响

李文娟^1,,
王平²,
徐海音²,
朱姗姗²,
尹静玄²
1.中南林业科技大学生命科学与技术学院，长沙 410004
2.中南林业科技大学环境科学与工程学院，长沙 410004
基金项目: 基金项目湖南省重点研发项目（2016SK2030） 湖南省教育厅一般项目（湘财教指[2016]40号）
关键词: 电动技术/
土壤/
镉去除/
增强剂/
土壤酶活性
摘要:为了探讨基于不同增强剂的电动技术对重金属污染土壤的修复效果，采用0.1% 浓度的草酸、柠檬酸、已二胺四乙酸（EDTA）、甲基甘氨酸二乙酸（MGDA）作为阴极电解液，电压梯度3 V·cm-1连续通电10 d，同时考查土壤中Cd的电迁移效果以及土壤酶（脲酶、酸性磷酸酶、过氧化氢酶）活性的变化。结果表明：相对于传统电动法（清水组），增强剂明显提高了Cd在土壤中的迁移效果，且人工螯合剂效果优于有机酸，对总Cd去除率为MGDA（63.08%）＞EDTA（23.75%）＞柠檬酸（18.43%）＞草酸（16.41%）＞清水（8.73%）。相比于清水组，EDTA抑制了土壤中3种酶活性，柠檬酸、草酸可以改善脲酶和过氧化氢酶的活性，MGDA显著提高了3种酶的活性。结合Cd去除率和酶的影响分析，MGDA不仅能显著提高电动修复效率，且具备较低的土壤环境风险。

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