自然暴露和室内养护条件下固化稳定化重金属污染黏土的稳定性研究

冯亚松; 王水; 周实际; 夏威夷; 葛宇翔; 钟道旭; 杜延军

doi:10.11779/CJGE2021S2037

自然暴露和室内养护条件下固化稳定化重金属污染黏土的稳定性研究 English Version

冯亚松^{1, 2, 3,},
王水^{1, 2},
周实际³,
夏威夷⁴,
葛宇翔⁵,
钟道旭^{1, 2},
杜延军^3, ,

1.
江苏省环境科学研究院,江苏　南京　210036
2.
江苏省环境工程重点实验室,江苏　南京　210036
3.
东南大学岩土工程研究所,江苏　南京　211189
4.
江苏省环境工程技术有限公司,江苏　南京　210019
5.
无锡市太湖湖泊治理股份有限公司,江苏　无锡　214062

基金项目:

国家重点研发计划 2019YFC1806000

国家重点研发计划 2019YFC1804000

国家自然科学基金项目 41877248

国家自然科学基金项目 41902276

江苏省环保科研课题 2016031

江苏省自然科学基金项目 BK20191501

江苏省环境工程重点试验室开放课题 ZX201703

详细信息

作者简介:
冯亚松(1987— ),男,博士,主要从事建设用地土壤污染防治研究。E-mail:fengyasongys@126.com

通讯作者:
杜延军, E-mail: duyanjun@seu.edu.cn

中图分类号: TU443
计量
- 文章访问数: 250
- HTML全文浏览量: 20
- PDF下载量: 80
出版历程
- 收稿日期: 2021-08-16
- 网络出版日期: 2022-12-05
- 刊出日期: 2021-10-31

Stability of solidified/stabilized heavy metal-contaminated clay under outdoor natural exposure and indoor standard curing

FENG Ya-song^{1, 2, 3,},
WANG Shui^{1, 2},
ZHOU Shi-ji³,
XIA Wei-yi⁴,
GE Yu-xiang⁵,
ZHONG Dao-xu^{1, 2},
DU Yan-jun^3, ,

1.
Jiangsu Provincial Academy of Environmental Science, Nanjing 210036, China
2.
Jiangsu Provincial Key Laboratory of Environmental Engineering, Nanjing 210036, China
3.
School of Transportation, Southeast University, Nanjing 210096, China
4.
Jiangsu Environmental Engineering Technology Co., Ltd., Nanjing 210019, China
5.
Wuxi Taihu Lake Restoration Co., Ltd., Wuxi 214062, China

摘要

摘要: 通过现场和室内试验对比研究了360 d内自然暴露和室内养护条件下新型羟基磷灰石基固化修复土的无侧限抗压强度、重金属浸出浓度及土的酸碱度等特性的变化规律。结果表明,经固化剂处理后,污染土无侧限抗压强度和pH值提高,而重金属浸出浓度显著降低；在7 d后,固化剂掺量5%的修复土重金属浸出浓度满足修复目标。试验持续90 d后,与室内养护条件相比,自然暴露条件下重金属浸出浓度较高,而修复土无侧限抗压强度和pH值较低。试验进行360 d时,重金属浸出浓度稍有增加,但仍远低于修复目标；修复土无侧限强度降低2.6%；修复土pH值降低0.3个单位。
- 重金属污染土 /
- 羟基磷灰石基固化剂 /
- 固化稳定化 /
- 长期监测 /
- 强度 /
- 浸出
Abstract: A comparative study on the strength and leaching properties of a nickel- and copper-contaminated soil hydroxyapatite-solidified/stabilized by a novel based binder is introduced under natural exposure and indoor curing. After a 360-d monitoring, the soil specimens are subjected to unconfined compression strength (UCS), leachability and soil pH tests. The results demonstrate that the UCS and pH of the contaminated soil remarkably increase with the addition of SPC, but the leaching concentrations of nickel and copper significantly decrease. With 5% binder addatin the leaching concentrations of nickel and copper are below their remediation goals after 7 d. The comparison shows that the strength and pH of the soil specimens under natural exposure is lower than that under indoor curing. Meanwhile, the leached concentrations of heavy metals of the treated soil under the two conditions is opposite. At 600 d, the slightly increased leachability of the treated soil still meets the remediation goal. The UCS of the treated soil decreased by 2.6%, and the pH value of the treated soil decreased by 0.3 units.
- heavy metal-contaminated soil /
- hydroxyapatite-based binder /
- solidification/stabilization /
- long-term monitoring /
- strength /
- leaching

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图 1 修复土无侧限抗压强度

Figure 1. Variation of UCS of treated soils with time

下载: 全尺寸图片幻灯片

图 2 浸出液镍浓度

Figure 2. Variation of leached concentrations of Ni with time

下载: 全尺寸图片幻灯片

图 3 浸出液铜浓度

Figure 3. Variation of leached concentrations of Cu with time

下载: 全尺寸图片幻灯片

图 4 固化土pH值

Figure 4. Variation of pH of soil with time

下载: 全尺寸图片幻灯片

表 1 污染土主要环境土工参数

Table 1 Geoenvironmental properties of contaminated soil

相对质量密度G_s 塑限w_P/% 液限w_L/% 最优含水率w_opt/% 最大干密度ρ_d/(g·cm^-3) pH值

2.66 15.9 31.4 18.1 1.73 6.52

下载: 导出CSV

参考文献(11)

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