SP-MOC固化砷污染土的浸出试验研究
摘要:为了确定不同浓度砷污染土固化所需的最佳配比,依托江苏某化工厂搬迁遗留场地,开展SP-MOC固化砷污染土并做毒性浸出试验,探讨不同固化剂配比下,固化体含水率、pH值及浸出浓度的变化规律,分析了养护龄期对浸出浓度的影响。试验结果表明:固化体含水率与固化剂掺量及养护龄期呈负相关特性,固化体pH值随固化剂掺量的增加而增大,并在养护龄期为14 d时达到其最大pH值。随着砷污染浓度的增加,所需的固化剂配比增大,当砷的背景值为90 mg/kg、188 mg/kg、275 mg/kg、339 mg/kg时,满足浸出限的固化剂配比分别为3%、5%、8%、8%。浸出浓度随固化剂掺量的增加,先降低后略有升高,在固化剂掺量为8%时,其浸出浓度达到最小值。浸出浓度随养护龄期的增大有所减小,养护14 d即可达到其最小浸出浓度。
Abstract:To determine the optimum ratio of arsenic-contaminated soil with different concentrations, SP-MOC curing of arsenic-contaminated soil and toxicity leaching test are carried out in the relocation of a chemical plant in Jiangsu Province. The change law of moisture content, pH value and leaching concentration of solidified body under different curing agent ratios are investigated, and the effect of curing age on leaching concentration is analyzed. The results show that the moisture content of the solidified body is negatively correlated with the curing age, and the pH value of the solidified body increases with the increase of the curing agent content, reaching the maximum pH value when the curing age is 14 days. With the increase of arsenic pollution concentration, the ratio of needed curing agent increases. When the background value of arsenic is 90 mg/kg, 188 mg/kg, 275 mg/kg, and 339 mg/kg, the curing agent ratios satisfying the leaching limit are 3%, 5%, 8%, and 8%, respectively. The leaching concentration decreases first and then increases slightly with the increase of curing agent content. When the content of curing agent is 8%, the leaching concentration reaches the minimum. The leaching concentration decreases with the increase of curing age, and reaches the minimum after 14 days of curing.
中文标题：
SP-MOC固化砷污染土的浸出试验研究
Experimental Study on Leaching of SP-MOC Solidified Arsenic-contaminated Soil
作者：
张钦喜1,张雪冬1,张志红1,姜玉肖2
Zhang Qinxi1,Zhang Xuedong1,Zhang Zhihong1,Jiang Yuxiao2
作者简介:张钦喜,男,1964年生,教授,研究生导师,主要从事地基处理及基坑工程等方面的教学与研究工作。E-mail:qinxizhang@126.com
通讯地址：
1. 北京工业大学建筑工程学院, 北京 100124; 2 中科鼎实环境工程有限公司, 北京 100015
1.CollegeofArchitectureandCivilEngineering,BeijingUniversityofTechnology,Beijing100124,China; 2.ChinaStateScienceDingshiEnvironmentEngineeringCo.,Ltd.,Beijing100015,China
中图分类号:TU411
doi:10.3969/j.issn.1007-2993.2020.04.012
出版物：岩土工程技术
收稿日期:2019-09-20
网络出版日期:2021-07-06
关键词:砷污染土,固化,稳定化,pH值,浸出毒性
Key words:arsenic-contaminated soil,solidification and stabilization,pH value,leaching toxicity
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基金项目：
基金项目: 北京市自然科学基金重点项目(8171001)
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