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在用Ca添加剂焚烧污泥过程中和有毒金属的迁移和转化

Feihong Guo¹, Weizhen Liu², WeiWei Chen³

¹Engineering Laboratory for Energy System Process Conversion and Emission Control Technology of Jiangsu Province, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing, 210042, China; Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, 210042, China; Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, Shanghai Jiao Tong University, Shanghai, 200240, China.

Journal of environmental management

|January 8, 2024

概括

添加剂增强回收,减少污泥燃烧期间的有毒金属. CaCl2和CaO显示出优异的转化,而CaSO4在吸附有毒金属方面表现出色,有助于资源利用.

科学领域:

环境科学与工程环境科学与工程
材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.

背景情况:

从污泥中回收资源的重要性日益增加.
需要了解 (Ca) 添加剂对转化和污泥燃烧期间有毒金属被动化的影响.

研究的目的:

为了比较不同Ca添加剂在富含氧气的燃烧下对的转化和有毒金属的被动化效应.
阐明这些Ca添加剂的特定作用机制.

主要方法:

用各种基于Ca的添加剂 (CaCl2,CaO,Ca(OH) 2,CaSO4) 来燃烧富含氧气的污泥.
对转化为稳定的酸 (AP) 的分析.
评估有毒金属的被动化和吸附效应.

主要成果:

所有四种Ca添加剂都改善了总回收,并促进了AP生成.
在转化过程中,CaCl2和CaO的效率比Ca(OH) 2和CaSO4更高.
CaCl2促进了特定的酸形成,而CaSO4则帮助在更高的温度下转化AlPO4.
与Ca ((OH) 2.2) 相比,CaO显示非酸盐无机转化为AP的更高转化率.
有毒金属的百分比随着CaCl2的减少,而CaSO4表现出显著的有毒金属吸附.
对于 Zn 转换的 Ca 添加剂有效性的顺序是 CaCl2 > Ca(OH) 2 > CaO > CaSO4.
酸盐添加剂降低了有毒金属污染水平和生态风险指数,其中Ni,Zn,Cr,Cu和Mn受到影响最大.

结论:

酸盐添加剂有效地将转化为稳定的AP,并在氧燃料污泥燃烧过程中使有毒金属被动化.
特定的Ca添加剂在回收和有毒金属管理方面具有明显的优势.
这些发现支持通过Ca添加剂增强燃烧的污泥的有益资源利用.

关键词:

在Ca添加剂的添加剂中.迁移和转型迁移和转型是一种的物质.污泥焚烧污泥焚烧污泥焚烧有毒金属有毒金属

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