吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (4): 1182-1188.doi: 10.13278/j.cnki.jjuese.20180313

• 地质工程与环境工程 • 上一篇    

稳定型与负载型FeS修复Cr(Ⅵ)污染地下水的可行性

洪梅1,2, 任璇1,2, 杨慧萍1,2   

  1. 1. 吉林大学新能源与环境学院, 长春 130021;
    2. 吉林大学石油化工污染场地控制与修复技术国家地方联合工程实验室, 长春 130021
  • 收稿日期:2018-11-28 发布日期:2020-07-29
  • 作者简介:洪梅(1972-),女,教授,博士生导师,主要从事污染场地控制与修复方向的研究,E-mail:hongmei@jlu.edu.cn
  • 基金资助:
    国家自然科学基金项目（41530636）；水体污染控制与治理科技重大专项（2018ZX07111001）

Remediation of Cr(Ⅵ) Contaminated Groundwater by Stable and Loaded FeS

Hong Mei1,2, Ren Xuan1,2, Yang Huiping1,2   

  1. 1. College of New Energy and Environment, Jilin University, Changchun 130021, China;
    2. National Local Joint Engineering Laboratory of Petrochemical Pollution Site Control and Remediation Technology, Jilin University, Changchun 130021, China
  • Received:2018-11-28 Published:2020-07-29
  • Supported by:
    Supported by National Natural Science Foundation of China(41530636) and Major Scientific and Technological Projects on Water Pollution Control and Government(2018ZX07111001)

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摘要： 纳米硫化亚铁（Nano-FeS）粒径小、比表面积大、反应活性高，但易团聚、易氧化的特点使其在地下水修复中的应用受到限制，通过改性可提高Nano-FeS的分散性和稳定性。本文选用羧甲基纤维素钠（CMC）及羟基铝柱撑膨润土（Alb）两种改性剂，制备了稳定型改性的CMC-FeS和负载型的Alb-FeS。分别从分散性、抗沉降性、抗氧化性、反应性和迁移性考察了两种改性Nano-FeS的性能。结果表明：Alb-FeS与CMC-FeS的分散性均较Nano-FeS得到明显改善；3 d后Nano-FeS完全沉降氧化，CMC-FeS沉降3 cm且开始氧化，而Alb-FeS沉降16 cm却未氧化；在相同的实验条件下，Alb-FeS、Nano-FeS、CMC-FeS对Cr （Ⅵ）的去除能力从强到弱，去除率分别是85.16%、84.90%、82.78%。在粗砂、中砂与细砂介质中，3种FeS的迁移能力从强到弱依次为CMC-FeS、Alb-FeS、Nano-FeS；在3种介质中CMC-FeS的最大迁移距离分别是Nano-FeS的6.1倍、6.4倍和3.4倍，而Alb-FeS与Nano-FeS相比迁移性没有明显提高。综合考虑分散性、抗沉降性、稳定性、反应活性及迁移能力，实际应用中宜优先选择CMC-FeS作为Cr （VI）污染地下水的原位修复材料。

关键词: 硫化铁, 羧甲基纤维素钠, 羟基铝柱撑膨润土, 反应性, 迁移性

Abstract: Nanometer iron sulfide (Nano-FeS) has small particle size, large specific surface and high reactivity, but its application in groundwater remediation is limited by its easy agglomeration and oxidation. The dispersion and stability of Nano-FeS can be improved by modification. In this study, two kinds of modifiers, sodium carboxymethyl cellulose (CMC) and pillared bentonite were used to prepare stable modified CMC-FeS and loaded Alb-FeS. The properties of the two modified Nano-FeS were investigated in terms of dispersivity, anti-sedimentation, anti-oxidation, reactivity,and migration. The results show that the dispersivity of Alb-FeS and CMC-FeS were improved obviously compared to Nano-FeS. After three days, Nano-FeS completely precipitated and oxidized, CMC-FeS precipitated 3 cm and began to oxidize, while Alb-FeS precipitated 16 cm without oxidation. Under the same experimental conditions, the removal rate of Alb-FeS,Nano-FeS, and CMC-FeS for Cr(Ⅵ) is 85.16%, 84.90%, and 82.78% respectively, and their removal ability is Alb-FeS > Nano-FeS > CMC-FeS. The migration ability of the three kinds of FeS in the medium of coarse sand, medium sand, and fine sand is CMC-FeS> Alb-FeS> Nano-FeS. The maximum migration distance of CMC-FeS in the three media is 6.1, 6.4 and 3.4 times of that of Nano-FeS, while the mobility of Alb-FeS is not significantly improved compared with that of Nano-FeS. Considering the dispersivity, anti-sedimentation, stability, reactivity, and migration, CMC-FeS should be selected as the in-situ remediation material for Cr (VI) contaminated groundwater in practical application.

Key words: iron sulfide, sodium carboxymethyl cellulose, hydroxyl aluminium pillared bentonite, reactivity, migration

中图分类号: 

  • X523
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