| 生活垃圾焚烧飞灰固化体力学及重金属浸出特性 |
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| 引用本文： | 唐强,陈辉,尹立新,刘杨.生活垃圾焚烧飞灰固化体力学及重金属浸出特性[J].环境工程,2017,35(4). |
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| 作者姓名： | 唐强 陈辉 尹立新 刘杨 |
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| 作者单位： | 1. 河海大学 岩土力学与堤坝工程教育部重点实验室,南京 210098;河海大学 江苏省岩土工程技术工程研究中心,南京 210098;苏州大学 城市轨道交通学院,江苏 苏州 215131;2. 苏州大学 城市轨道交通学院,江苏 苏州,215131;3. 河海大学 岩土力学与堤坝工程教育部重点实验室,南京 210098;河海大学 江苏省岩土工程技术工程研究中心,南京 210098;常熟理工学院 经济与管理学院,江苏 常熟 215500 |
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| 基金项目： | 中国博士后科学基金第59批面上项目，江苏省博士后科研资助计划项目，软弱土与环境土工教育重点实验室(浙江大学)开放基金，江苏省建设系统科技项目，苏州市住房和城乡建设局建设科研项目 |
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| 摘 要： | 以苏州七子山生活垃圾焚烧厂产生的飞灰为研究对象,采用水泥作为固化剂,研究水泥飞灰固化体的应力应变特征及重金属浸出特性,并探讨了水泥飞灰配合比、养护时间等关键性因素对这些特性的影响。实验结果表明:较养护3 d的样品,其余养护时间的样品强度平均增长了约96.2%,而其破坏应变平均减小了56%。随着水泥含量和养护时间的增加,飞灰固化体的强度上升,而其破坏应变减小,该趋势主要归因于钙矾石(AFt)的形成促进了飞灰固化体强度的发展。较飞灰原样,飞灰固化体的重金属浸出浓度随着水泥含量、养护时间的增加而降低了38%~99%,重金属的迁移被限制,主要归因于水化硅酸钙(C—S—H)和钙矾石(AFt)的形成,以及飞灰和水泥水化反应创造的强碱性环境。
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| 关 键 词： | 城市生活垃圾焚烧飞灰 水泥 固化/稳定化 应力应变 重金属浸出 |
MECHANICS AND LEACHING CHARACTERISTICS OF HEAVY METALS IN STABILIZED MSWI FLY ASH |
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| Abstract: | Taking the fly ash from Suzhou Qizi Mountain Municipal Solid Waste Incineration(MSWI) Plant as the research object,the solidification/stabilization by ordinary portland cement as the binder was carried out.And influence of key factors like fly ash/cement proportion and curing time on strength and leaching of the solidified objects was evaluated.According to the test results,both cement/fly ash ratio and curing time had significant effects on the compressive strength,failure strain and leaching behavior.Compared with the specimens under 3 days' curing,the compressive strength of the samples after other curing time increased by around 96.2％,and the failure strain decreased by about 56％.The increase of the cement content and curing time dominated the enhance of compressive strength of the solidified matrices,and the decrease of the failure strain,which was due to the formation of ettringite (AFt).Compared with the original fly ash,the concentration of heavy metals leached from the solidified matrices decreased by 38％ ～99％,which were resulted from the restriction on the migration of heavy metals ions by many aspects,such as C-S-H gel,fomation of ettringte (AFt),and alkalic condition created by the reaction of fly ash and cement. |
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| Keywords: | MSWI fly ash cement solidification/stabilization stress-strain leaching of heavy metals |
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