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

doi:10.11779/CJGE2021S2037

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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。

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	冯亚松
	王水
	周实际
	夏威夷
	葛宇翔
	钟道旭
	杜延军

关键词 ：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.

Key words： heavy metal-contaminated soil hydroxyapatite-based binder solidification/stabilization long-term monitoring strength leaching

收稿日期: 2021-08-17

ZTFLH:

TU443

基金资助:国家重点研发计划（2019YFC1806000,2019YFC1804000）; 国家自然科学基金项目（41877248,41902276）; 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）

通讯作者: *（E-mail: duyanjun@seu.edu.cn）

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。

引用本文:

冯亚松, 王水, 周实际, 夏威夷, 葛宇翔, 钟道旭, 杜延军. 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[J]. 岩土工程学报, 2021, 43(zk2): 154-157. FENG Ya-song, WANG Shui, ZHOU Shi-ji, XIA Wei-yi, GE Yu-xiang, ZHONG Dao-xu, DU Yan-jun. Stability of solidified/stabilized heavy metal-contaminated clay under outdoor natural exposure and indoor standard curing. Chinese J. Geot. Eng., 2021, 43(zk2): 154-157.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE2021S2037 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2021/V43/Izk2/154

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