热解条件对污水污泥生物炭性质的影响以及基于PAH含量的潜在风险
Tamara Dudnikova1, Ming Hung Wong2, Tatiana Minkina1
1Southern Federal University, Rostov-on-Don, Russian Federation.
Environmental research
|December 1, 2024
概括
污水污泥的热解可以为土壤制造安全的生物炭. 最佳条件减少有害的多环芳 (PAHs),使生物炭安全用于农业使用高达26t/ha.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 废物管理 废物管理
背景情况:
- 污水污泥是一个重要的工业废物挑战.
- 从污水污泥中提取的生物煤具有减少废物和修改土壤的潜力.
- 了解生物炭的质量和安全性对于其应用至关重要.
研究的目的:
- 评估从污水污泥中生产的生物炭的物理化学特性,元素组成,结构特征和特定表面积.
- 确定热解条件对优先多环芳 (PAH) 减少的影响.
- 评估与生物炭应用相关的致癌风险,并确定安全使用率.
主要方法:
- 在不同的条件下 (温度,时间,加热速度) 污水污泥的热解.
- 生物炭的物理化学特性,元素组成和结构特征的分析.
- 使用增量终身癌症风险模型量化优先PAH和评估致癌风险.
- 在Haplic Chernozem土壤中确定生物炭的安全应用率.
主要成果:
- 确定了最佳的热解条件 (700°C,60分钟,5°C/分钟).
- 首要的PAH总量减少了48% (从6367 ng/g降至3317 ng/g).
- 评估了致癌风险,主要来自烯,烯和二烯,并指出儿童通过口腔/皮肤暴露和成年人通过吸入风险更高.
- 在最佳条件下生产的生物炭符合国际生物炭倡议对PAHs的标准.
- 在Haplic Chernozem土壤中,生物炭的安全应用率高达26t/ha.
结论:
- 热解是一种有效的方法来减少污水污泥中的危险化合物,产生安全的生物炭.
- 优化的热解条件显著降低了与生物炭相关的致癌风险.
- 来自污水污泥的生物炭可以安全地应用于Haplic Chernozem土壤的推率.
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