长江科学院院报 ›› 2017, Vol. 34 ›› Issue (6): 24-28.DOI: 10.11988/ckyyb.20160231

• 水资源与环境 • 上一篇    下一篇

镉污染稻田土壤土柱淋洗修复研究

罗希a,b,林莉a,b,李青云a,b,胡艳平a,b   

  1. 长江科学院 a. 流域水环境研究所; b.流域水资源与生态环境科学湖北省重点实验室,武汉 430010
  • 收稿日期:2016-03-15 修回日期:2016-05-27 出版日期:2017-06-01 发布日期:2017-06-19
  • 作者简介:罗 希(1989-),男,湖北麻城人,工程师,博士,研究方向为污水资源化与能源化技术及土壤修复技术,(电话)027-82927206(电子信箱)luoxi2911688@126.com。
  • 基金资助:
    水利部公益性行业科研专项(201501019);中央级公益性科研院所基本科研业务费项目(CKSF2015014/SH);上海同济高廷耀环保科技发展基金会资助项目

Remediation of Cadmium-contaminated Paddy Soils by Column Leaching

LUO Xi1,2,LIN Li1,2,LI Qing-yun1,2,HU Yan-ping1,2   

  1. 1.Department of Basin Water Environment, Yangtze River Scientific Research Institute, Wuhan 430010, China;
    2.Hubei Provincial Key Laboratory of Basin Water Resources and Eco-environmental Sciences, Yangtze River Scientific Research Institute, Wuhan 430010, China
  • Received:2016-03-15 Revised:2016-05-27 Online:2017-06-01 Published:2017-06-19

摘要: 以三氯化铁为淋洗剂,采用土柱淋洗法对镉污染稻田土壤进行了修复研究。系统考察了土壤的干湿状态、淋洗液浓度及体积、搅拌次数、淋洗时间等淋洗条件对Cd去除率的影响,深入探究了Cd在土柱中的分布规律。结果表明“干洗”条件下的修复效果优于“湿洗”;淋洗液浓度、搅拌次数、淋洗时间及淋洗液体积的增加均能提升Cd的去除率,但提升程度有限;当采用“干洗”方式进行淋洗,且三氯化铁浓度为0.05 M、搅拌次数为3、淋洗时间为2 d及淋洗液体积为450 mL时,Cd的去除率可达最大值25.4%;在此最优淋洗条件下,洗脱的Cd中有86.7%存在于孔隙水中。由此表明,在稻田淋洗修复过程中,高效排出孔隙水是修复的关键。

Abstract: Remediation of cadmium-contaminated paddy soils by column leaching with ferric chloride was carried out. The effects of leaching conditions including dry or wet state of soil, concentration and volume of leaching solution, stirring times and leaching time on the removal rate of Cadmium (Cd) were investigated systematically. The distribution of Cd in the soil column was also studied in depth. Results suggest that the remediation effect of dry washing was better than that of wet washing. The increase of concentration and volume of leaching solution, and stirring times as well as leaching time could all result in a limited improvement of the removal rate of Cd. The removal rate of Cd achieved a maximum value of 25.4% when using dry washing with the concentration of leaching solution of 0.05 mol/L, three times of stirring, 2 days of leaching, and 450 mL leaching solution. Under this optimal condition for leaching, nearly 86.7% of the removed Cd existed in pore water, which implies that discharging the pore water efficiently is crucial in the process of leaching remediation for paddy soils.

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