地学前缘 ›› 2022, Vol. 29 ›› Issue (3): 207-216.DOI: 10.13745/j.esf.2022.1.36

• 地下水环境保护 • 上一篇    下一篇

高氯酸盐自然衰减的柱实验研究

梁凯旋1,2(), 刘菲1,*(), 张莉3   

  1. 1.中国地质大学(北京) 水资源与环境学院, 北京 100083
    2.北京市矿产地质研究所, 北京 101500
    3.中国矿业大学 资源与地球科学学院, 江苏 徐州 221116
  • 收稿日期:2021-12-06 修回日期:2022-01-28 出版日期:2022-05-25 发布日期:2022-04-28
  • 通讯作者: 刘菲
  • 作者简介:梁凯旋(1991—),男,硕士研究生,环境科学与工程专业。 E-mail: liang123123300@foxmail.com
  • 基金资助:
    中国地质调查局地质调查项目“地下水中有机污染组分对补给方式的响应——水样测试分析质量控制”(DD20190323);国家自然科学基金项目(41272268)

Natural attenuation of perchlorate: A column experiment study

LIANG Kaixuan1,2(), LIU Fei1,*(), ZHANG Li3   

  1. 1. School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
    2. Beijing Institute of Mineral Geology, Beijing 101500, China
    3. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
  • Received:2021-12-06 Revised:2022-01-28 Online:2022-05-25 Published:2022-04-28
  • Contact: LIU Fei

摘要:

高氯酸盐( ClO 4 -)是一种小分子量、有毒的无机络阴离子,普遍存在于环境中。由于其分子大小与碘离子相似,会干扰人体甲状腺的正常功能,因此其环境污染问题引起了广泛的关注。本文选取污染场地的天然河沙为试验材料,主要通过柱实验对地下水中 ClO 4 -自然衰减过程进行研究,考察了铁氧化物、 NO 3 - ClO 4 -自然衰减过程产生的影响。结果表明,高氯酸盐自然衰减过程主要由微生物驱动,天然河沙可去除2 mg/L的 ClO 4 -,但其过程缓慢且还原量有限,长期去除率不超过10%,其限制因素为缺乏电子供体;铁氧化物可以促进 ClO 4 -自然衰减,但当溶解性铁的浓度低于5.5 mg/L时,衰减过程开始受到影响;地下水中的 NO 3 -会抑制 ClO 4 -的降解,当 NO 3 -低至10 mg/L或以下时, ClO 4 -才开始明显降解。

关键词: 高氯酸盐, 自然衰减, 微生物降解, 电子供体, 铁氧化物, 硝酸盐

Abstract:

Perchlorate ( ClO 4 -), a low molecular weight toxic inorganic complex anion is a widespread contaminant in the environment. Perchlorate contamination is a serious environmental problem as perchlorate is known to impact thyroid function by replacing iodine intake due to its similar molecular size with iodine. Column experiments, using river sand from the polluted site as the experimental material, were conducted to stimulate natural attenuation of the target pollutant, perchlorate ( ClO 4 -). The effects of iron oxides and nitrate ( NO 3 -) were also evaluated. The results show that ClO 4 - natural attenuation is mainly dependent on microbial degradation in the aquifer, and the groundwater environment is more conducive to microbial activity. Natural river sand can remove 2 mg/L ClO 4 -; however, the process is slow and the reduction amount is limited. A lack of electron donors was found to result in a long-term removal efficiency of less than 10%. Iron oxides can stimulate natural attenuation of ClO 4 -. In fact, the attenuation process began to be affected when the concentration of dissolved iron was lower than 5.5 mg/L. Nitrate ( NO 3 -) in groundwater has an inhibitory effect on ClO 4 - reduction. When NO 3 - concentration was less than 10 mg/L, an apparent reduction in ClO 4 - could be initiated.

Key words: perchlorate, natural attenuation, microbial degradation, electron donors, iron oxides, nitrate

中图分类号: