岩土力学 ›› 2022, Vol. 43 ›› Issue (S2): 337-344.doi: 10.16285/j.rsm.2021.1284

• 基础理论与实验研究 • 上一篇    下一篇

石灰粉煤灰固化对盐渍土中石油污染物迁移的 控制性研究

李敏1, 2，于禾苗1，马国伟1，柴寿喜3   

  1. 1. 河北工业大学 土木与交通学院，天津 300401；2. 河北工业大学 河北省土木工程技术研究中心，天津 300401； 3. 天津城建大学 地质与测绘学院，天津 300384
  • 收稿日期:2021-08-10 修回日期:2022-02-18 出版日期:2022-10-10 发布日期:2022-10-03
  • 作者简介:李敏，女，1985年生，博士，教授，主要从事污染土的处置方面的研究。
  • 基金资助:
    国家自然科学基金（No.51978235）；河北省自然科学基金（No.E2018202274）；河北省科技创新战略基金（No.20180602）。

Study on control of lime-fly ash solidification on migration of petroleum pollutants in saline soil

LI Min1, 2, YU He-miao1, MA Guo-wei1, CHAI Shou-xi3   

  1. 1. School of Civil Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Hebei Research Center of Civil Engineering Technology, Hebei University of Technology, Tianjin 300401, China; 3. School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, China
  • Received:2021-08-10 Revised:2022-02-18 Online:2022-10-10 Published:2022-10-03
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51978235), the Natural Science Foundation of Hebei Province(E2018202274) and the Technology Innovation Strategy Foundation of Hebei Province(20180602).

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摘要： 提高石油污染物被土吸附的稳定性是实现污染土工程再利用的前提和关键。依托滨海地区石油污染盐渍土的处置需求，优选兼具固化和吸附作用的石灰和粉煤灰为固化材料，以固化作用、污染强度、土体密度为变量参数，搭建加压淋滤平台模拟外界环境，借助滤后含油量和渗出石油量为指标评价固化作用对盐渍土中石油污染物迁移的控制性。研究结果表明：固化作用可提高石油污染物的吸附稳定性，有效控制土中石油污染物的迁出。加压淋滤作用下，固化污染土含油量变化率仅为1.52%～2.27%，渗出含油量为7.15～14.92 mg/L，满足《污水综合排放标准》（GB 8978－1996）三级标准。固化作用可解决未固化污染土中因土体密度、污染强度变化而引起的污染物大幅度迁移问题，滤后含油量均接近于初始含油量。石灰粉煤灰的固化作用对污染物迁移的控制效果稳定，在石油污染土处置方面具有普遍适用性。

关键词: 石油污染土, 迁移控制性, 固化再利用, 石灰粉煤灰, 加压淋滤

Abstract: Improving the adsorption stability of petroleum pollutants in soil is the premise and key to the engineering reuse of contaminated soil. Relying on the disposal needs of oil contaminated saline soil in coastal areas, lime and fly ash that have solidification and adsorption function, were selected as solidifying materials. Solidification effect, contamination intensity and soil density were taken as variable parameters. The external environment was simulated with the help of pressure leaching. The control effect of solidification on the migration of pollutants in soil was evaluated by the residual oil content and oil seepage of soil. Results show that solidification can improve the adsorption stability of pollutants and control its migration. Under the action of pressure leaching, the change rate of oil contents in the solidified contaminated soil is only 1.52%−2.27%, and the oil seepage is 7.15−14.92 mg/L, which meet the class III standard of Integrated Wastewater Discharge Standard (GB 8978－1996) of China. Solidification can solve the large-scale migration problem of pollutants caused by the change of soil density and pollution intensity in unsolidified contaminated soil, and the oil content after leaching is close to the initial oil content. Solidification of lime and fly ash has a stable control effect on pollutants and has universal applicability in the disposal of petroleum contaminated soil.

Key words: petroleum-contaminated soil, migration control, solidification and reuse, lime and fly ash, pressure leaching

中图分类号: 

  • X53
[1] 李敏, 孟德骄, 姚昕妤. 基于温度效应下二灰固化石油污染滨海盐渍土 力学特性优化固化需求[J]. 岩土力学, 2020, 41(4): 1203-1210.
[2] 赵 艳，石名磊. 磷石膏混合料的再生[J]. , 2007, 28(S1): 98-102.
[3] 吴景海. 土工合成材料界面作用特性的拉拔试验研究[J]. , 2006, 27(4): 581-585.
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