六价铬污染土的还原—吸附—固化修复

金典; 张文杰

doi:10.3724/j.gyjzG23070416

六价铬污染土的还原—吸附—固化修复

doi: 10.3724/j.gyjzG23070416

金典¹,
张文杰^2, ,

1. 上海大学力学与工程科学学院, 上海 200444;
2. 台州学院建筑工程学院, 浙江台州 318000

基金项目:

国家自然科学基金项目（52478353）。

详细信息

作者简介:
金典,硕士研究生,主要从事环境岩土工程方面的研究,jindian@shu.edu.cn。

通讯作者:
张文杰,教授,主要从事环境岩土工程方面的研究,zhwjlyl@163.com。

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出版历程
- 收稿日期: 2023-07-04
- 网络出版日期: 2026-06-06
- 刊出日期: 2026-04-20

Remediation of Cr（VI）-Contaminated Soil by Reduction， Adsorption， and Solidification

JIN Dian¹,
ZHANG Wenjie^{2
, ,}

1. School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China;
2. College of Civil and Architectural Engineering, Taizhou University, Taizhou 318000, China

摘要

摘要: 在重金属铬的两种常见价态中，六价铬具有强迁移性和致癌性，而三价铬不易迁移且毒性较低，因此铬污染土的治理通常是先将六价铬还原为三价，再将其固化。在此基础上提出铬污染土的还原—吸附—固化联合修复技术，旨在通过引入吸附剂，提高修复效果，并在一定程度上减少还原剂和固化剂用量。通过合成沉降浸出试验、无侧限抗压强度试验和酸中和能力试验，分析了不同的药剂组合和药剂添加方式下铬污染土的修复效果和机理。合成沉降浸出试验结果表明：依次加入还原剂、吸附剂和固化剂的还原—吸附—固化联合修复技术，可显著降低固化体中铬离子的浸出浓度，使用多硫化钙作为还原剂的效果优于硫酸亚铁。无侧限抗压强度试验结果表明：添加吸附剂后固化体强度略有降低，但仍满足污染土固化处理强度标准。酸中和能力试验结果表明：联合修复技术提高了固化污染土抵抗酸侵蚀的能力；联合修复技术最佳的药剂组合为多硫化钙-蛭石-水泥。修复药剂添加方式的研究表明：将还原剂与吸附剂一次添加，然后添加固化剂，与三种药剂分三次添加情况下修复效果基本相同，据此可以简化联合修复的工艺流程。
- 铬污染土 /
- 固化/稳定化 /
- 吸附 /
- 浸出浓度
Abstract: Among the two major states of chromium， Cr（VI） is high mobile and carcinogenic whereas Cr（III） is less toxic. Remediation of chromium-contaminated soil usually involves reducing Cr（VI） to Cr（III） and subsequently immobilizing it. In this paper， a combined remediation technique including reduction， adsorption， and solidification was proposed. By employing an adsorbent， the remediation effectiveness was improved and the amount of reducing and curing agent was to some extent decreased. Synthetic precipitation leaching procedure （SPLP）， unconfined compressive strength （UCS）， and acid neutralization capacity （ANC） tests were carried out to evaluate the remediation effect of different agent combinations and different addition procedures. SPLP tests showed that the reduction-adsorption-solidification treatment significantly reduced the leached chromium. Using calcium polysulfide as the reducing agent was more effective than using ferrous sulfate. UCS tests showed that the strength of the solidified soil was reduced after employing the adsorbent， but the standards for strength could still be satisfied. ANC tests demonstrated that the combined remediation technology improved the capacity of the solidified system to resist acid erosion. The best combined dosage was calcium polysulfide， vermiculite， and cement. The researches on adding procedures showed that adding the reducing agent and adsorbent together and then adding the curing agent achieved similar effects to adding the three agents separately. This could facilitate the remediation process.
- chromium-contaminated soil /
- solidification/stabilization /
- adsorption /
- leached concentration

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