摘要
文章利用一维半动态浸出法研究飞灰基碱激发胶凝材料中重金属(Ni、Cr、Pb、Cd)浸出行为,结合浸出理论,分析在非碱性条件下重金属浸出行为。结果表明:在酸性和中性条件下,胶凝材料中重金属的浸出均为扩散性浸出。在pH=3的强酸性和pH=3的弱酸性条件下,4种金属的扩散系数<10^(-11)m^(2)/s,试块中污染物较为稳定,但在弱酸条件下重金属浸出浓度明显高于强酸条件,长期使用具有一定风险性。中性条件下,4种重金属的扩散系数<3×10^(-13)m^(2)/s,胶凝材料中的重金属较稳定,长期使用安全性强。
In this paper, leaching testing was conducted using the one-dimensional semi-dynamic leaching method to investigate the leaching behavior of heavy metals(Ni, Cr, Pb and Cd) in fly ash-based alkali-activated gelling materials, the fly-ash being from a municipal solid-waste incineration facility;and combined with the leaching theory, the leaching behavior of heavy metals under non-alkaline condition was analyzed. The results showed that in the case of acidic and neutral leaching conditions, the heavy metals leached out from the gelling materials was a kind of diffusion, Under the conditions of strong acidity(pH=3) and weak acidity(pH=3), the diffusion coefficients of the four metals are less than 10^(-11) m^(2)/s, the contaminants in the test blocks are relatively stable, but the leaching concentration of heavy metals in weak acid condition is significantly higher than that in strong acid condition, long-term use the has certain risks. Under neutral conditions, the diffusion coefficients of the four heavy metals are less than 3×10^(-13) m^(2)/s, and the heavy metals in the cementitous materials are relatively stable and safe for long-term use.
作者
孙胤涛
姚科
郑虞琪
康治金
徐炎华
刘志英
SUN Yintao;YAO Ke;ZHENG Yuqi;KANG Zhijin;XU Yanhua;LIU Zhiying(School of Environmental Science and Engineering,Nanjing Tech University,Nanjing 210000,China;Nanjing Tech University Environmental Science and Technology Co.,Ltd.,Nanjing 210000,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第1期24-31,共8页
Environmental Science & Technology
基金
国家“十三五”重点研发课题(2017YFB0602500)
江苏省高校自然科学研究计划(16KJA610002)。
关键词
生活垃圾焚烧飞灰
胶凝材料
重金属
扩散
fly-ash of municipal solid-waste incineration
gelling material
heavy metal
diffusion
作者简介
孙胤涛(1997-),男,硕士研究生,主要从事固废无害化与资源化研究,(电子信箱)853348124@qq.com;通讯作者:刘志英,女,副研究员,博士,主要从事固废处理处置及综合利用,废水污染控制及资源化研究,(电子信箱)23656070@qq.com。
