在化城市固体废物焚烧中通过低温热解法降解二氧化的降解飞灰
Xinglei Zhao1, Yaqi Peng1, Shengyu Ying1
1State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China.
Chemosphere
|November 5, 2024
概括
低温热解有效地从飞灰中去除PCDD/F (多二-p-二氧化物和二福兰) 和I-TEQ (国际毒性等价物). 这种方法显示了高降解率,并降低了毒性,使飞灰适合资源利用.
科学领域:
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
- 废物管理 废物管理
背景情况:
- 城市固体废物焚烧炉的飞灰含有危险的PCDD/F和I-TEQs.
- 有效和安全的处置方法对于环境保护和资源利用至关重要.
研究的目的:
- 调查低温热解在飞灰中降解PCDD/F和I-TEQ的有效性.
- 确定PCDD/F降解途径以及化剂和抑制剂的影响.
- 评估经处理的飞灰对潜在资源利用的毒性.
主要方法:
- 低温热解的应用在原始和化飞灰上.
- 分析PCDD/F特征以确定降解途径.
- 改变温度和反应时间以优化降解.
- 使用结合剂EDTA和抑制剂Na2HPO4.4的使用.
主要成果:
- PCDD/F降解率在89.97%至99.80%之间,I-TEQs去除率在98.96%至99.90%之间.
- EDTA增强了降解,而Na2HPO4促进了再生.
- 更高的温度和更长的反应时间更有效.
- 处理的飞灰毒性 (1.8419.45 ng I-TEQ/kg) 低于资源利用的允许限度.
结论:
- 低温热解是一种有前途的技术,用于排毒飞.
- 通过C-O键断裂的热破坏是主要的降解途径.
- 需要进一步的研究来大规模应用这种处置技术.
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