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微量元素在污水污泥和煤炭污泥中的迁移和转化联合燃烧

Hengda Han¹, Kuan Du¹, Xiaoxue An¹

¹State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.

|October 2, 2023

概括

污水污泥和煤炭粘液的联合燃烧抑制了微量元素的排放,而像高酸盐和石膏这样的矿物质捕获污染物. 高温会改变排放率,但风险仍在国家标准范围内.

科学领域:

环境科学环境科学
废物管理废物管理
燃烧化学燃烧化学是什么

背景情况:

污水污泥 (SS) 和煤炭污泥 (CS) 的联合燃烧提供了更好的燃烧,但存在微量元素 (TE) 释放和二次污染的风险.
在这个过程中了解特定的TE (As,Cr,Pb,Zn,Mn) 的迁移和转化对于环境安全至关重要.

研究的目的:

为了研究在SS和CS的共同燃烧过程中As,Cr,Pb,Zn和Mn的行为.
阐明矿物形成 (高岩,石膏) 在 TE 封存和排放中的作用.
为了评估共同燃烧灰中的TEs的泄漏特性和环境风险.

主要方法:

在不同的条件下,SS和CS的实验性联合燃烧.
分析TE迁移和转型途径.
灰样本的矿物学分析 (例如,高岩,石膏形成).
模型实验模拟矿物与TEs的相互作用.
漏试验和燃烧灰的风险评估.

主要成果:

联合燃烧通常抑制了 Zn,As,Pb 和 Mn 的排放,对 Zn,As 和 Mn 有显著影响.
考利尼特和石膏是在共同燃烧灰中形成的,与单独燃烧不同.
考利尼特捕获了As,Pb和Mn;石膏捕获了Zn,As和Mn,但促进了Pb和Cr的排放.
温度上升 (700-1300°C) 导致 TE 排放比率因矿物分解和形成而发生复杂变化.
泄漏测试显示TE风险仅略有增加,所有TE都符合国家标准.

结论:

同时燃烧SS和CS可以有效地减少几个关键微量元素的排放.
卡奥利尼特和石膏等矿物的形成和转化在控制 TE 行为的过程中起着至关重要的作用.
虽然温度影响 TE 排放概况,但根据当前的标准,与灰相关的整体环境风险仍然是可以接受的.

关键词:

共同燃烧是一种共同燃烧.煤炭粘液是煤炭中的一种粘液.互动互动互动互动污水污泥的污水污泥是污水中的污泥.微量元素中的微量元素.

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