碱激发螯合生活垃圾焚烧飞灰力学性能和毒性浸出特性
Mechanical Properties and Toxic Leaching Characteristics of Alkali-Activated Chelated Municipal Solid Waste Incinerator Fly Ash
卢诗琳 1丁秀明 1罗琦 1叶伟开 1董发鑫 2吴培喜 1马俊 3汪峻峰1
作者信息
- 1. 深圳大学土木与交通工程学院,深圳 518061
- 2. 防灾科技学院土木工程学院,廊坊 065201
- 3. 中国建筑第八工程局有限公司,深圳 518000
- 折叠
摘要
生活垃圾焚烧飞灰螯合固化后,仍存在一定环境隐患,填埋会占用大量土地,将其再利用可以减缓填埋场的压力.本文采用碱激发技术制备螯合飞灰-矿粉基碱激发胶凝材料,除探讨碱激发螯合飞灰的可行性以外,还研究了氧化钙掺量对胶凝材料性能的影响.结果表明,在氧化钙掺量为4％(质量分数)时,固化体的抗压强度最高,而当氧化钙掺量超过4％时,固化体的抗压强度则会缓慢减小.氧化钙的加入促进了 C-S-H凝胶水化产物的形成,显著提高了材料的抗压强度.同时,通过浸出试验发现掺入氧化钙的固化体的重金属浸出浓度低于未掺氧化钙的固化体,并且满足规定《生活垃圾填埋场污染控制标准》(GB 16889-2008)限制值.
Abstract
After the chelation and solidification of municipal solid waste incineration fly ash,there are still certain environmental hazards.Landfilling will occupy a large amount of land,and reusing can alleviate the pressure on landfill site.This article used alkali activation technology to prepare chelated fly ash mineral powder based alkali-activated cementitious material.In addition to exploring the feasibility of alkali-activated chelated fly ash,the influence of calcium oxide content on improving the performance of cementitious material was also explored.The results show that the compressive strength of solidified body is highest when calcium oxide content is 4％(mass fraction),while the compressive strength of solidified body slowly decreases when calcium oxide content exceedes 4％.The addition of calcium oxide promotes the formation of hydration products of C-S-H gel and significantly improves the compressive strength of material.Meanwhile,through leaching tests,it is found that the heavy metal leaching concentration of solidified body doped with calcium oxide is lower than that of solidified body without calcium oxide,and meets the limit values specified in"Standard for pollution control on the landfill site of municipal solid waste"(GB 16889-2008).
关键词
生活垃圾焚烧飞灰/螯合飞灰/碱激发胶凝材料/抗压强度/毒性浸出Key words
municipal solid waste incinerator fly ash/chelated fly ash/alkali-activated cementitious material/compressive strength/toxicity leaching引用本文复制引用
基金项目
海南省重点研发项目(ZDYF2022SHFZ322)
出版年
2024
国家科技期刊平台
NSTL
万方数据