在固体废弃物和污泥热解中有效稳定重金属,使用间脱皮改性甲:实验和模拟研究
Yuxuan Yang1, Zhaoping Zhong1, Baosheng Jin1
1Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.
Waste management (New York, N.Y.)
|February 24, 2024
概括
修改后的白石在废物热解过程中有效地固定重金属,3-aminopropyltriethoxysilane (3IV) 显示超过75%的保留率. 这大大降低了废物中重金属的生态风险.
科学领域:
- 环境科学 环境科学
- 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:
- 热解为固体废物和污泥管理提供了一种比焚烧和填埋更清洁的替代方案.
- 然而,重金属污染仍然是热解过程中的重大挑战.
研究的目的:
- 为了研究干脱皮改性白石在废物热解过程中控制重金属的有效性.
- 为了评估四种不同间隔剂 (尿素,二甲基硫氧化物,三酸盐和3-aminopropyltriethoxysilane) 对于重金属保留的性能.
主要方法:
- 通过使用不同的间隔器合成了四种类型的改性白石 (UIV,DIV,TIV,3IV).
- 这些经过修改的藻石被应用于城市污水污泥,造纸厂污泥,城市生活垃圾和老废物中.
- 在450°C时评估重金属保留,并评估潜在的生态风险.
主要成果:
- 维米库利特层间的间距与重金属保留有积极的相关性.
- 在所有测试的废物中,3-aminopropyltriethoxysilane (3IV) 修饰的甲化物显示出最高的平均重金属保留率 (>75%).
- 虽然Cd带来了中等到相当大的生态风险,3IV显著降低了与Cd,Cr,Cu,Pb和Zn相关的风险.
结论:
- 改性白,特别是3IV,是一种高效的添加剂,可以在废物热解过程中固定重金属.
- 吸附机制涉及白石和重金属化合物之间的电子流,氧化物比化物具有更强的吸附性.
- 这种方法提供了一个有希望的策略,以减轻废物热解的重金属污染.
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