从污水污泥中获得肥的新型连续焚烧化工艺
Guohui Xuan1, Xiangyu Gu2, Rongjiang Hao1
1State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China; Sino-Danish Center for Education and Research, Beijing 100190, China.
Waste management (New York, N.Y.)
|June 20, 2025
概括
从污水污泥 (SS) 中回收 (P) 转化为肥料是通过使用CaO和MgO添加剂的分阶段焚烧化工艺来优化的. 这种方法提高了P的生物可用性,并减少了可持续化肥生产的能源消耗.
科学领域:
- 环境化学环境化学
- 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:
- 从污水污泥 (SS) 中回收用于肥料生产,这带来了技术,经济和环境方面的挑战.
- 低P的可用性和危险化学品的使用阻碍了当前的P回收方法.
研究的目的:
- 开发一个分阶段的焚烧-化工艺,从SS中生产酸肥 (FCMP) 以降低能源消耗.
- 研究CaO和MgO添加剂在增强P回收和生物可用性方面的作用.
主要方法:
- 一个循序渐进的焚烧化工艺,使用SS补充了CaO和MgO添加剂.
- 确定最佳的添加剂比率 (Ca7.25Mg4.57) 并检查NBO/T公式 (2.3-2.5).
- 材料表征和分子动力学模拟以分析玻璃网络脱聚合.
主要成果:
- 在生产的FCMP中达到9.41%的总P含量和100%的P生物可用性.
- 在SS与添加剂的联合焚烧过程中,超过95%的P固定在灰中,最大限度地减少P损失.
- 和MgO有效地去聚合了玻璃网络,MgO表现出更强的效果,促进了酸盐的形成.
结论:
- 开发的过程提供了一种有效的方法来从SS中回收P,产生高质量的FCMP.
- 了解玻璃网络脱聚合机制为优化P回收过程提供了洞察力.
- 这种方法解决了P稀缺问题,并促进了从废物中生产可持续的肥料.
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