使用Acidithiobacillus thiooxidans提取铜的污水污泥的生物洗:优化和生态风险评估
S O Rastegar1, A Samadi1, P Ahmadnezhad1
1Department of Chemical Engineering, Faculty of Engineering, University of Kurdistan, Sanadaj, Iran.
Chemosphere
|February 16, 2024
概括
这项研究使用Acidithiobacillus thiooxidans从污水污泥中进行铜生物洗,实现了85.3%的回收率. 该过程还对污泥进行了排毒,使其安全处置,并改善了土壤质量.
科学领域:
- 环境微生物学 环境微生物学
- 生物技术是生物技术.
- 废物管理 废物管理
背景情况:
- 污水污泥由于含有重金属,造成了处理方面的挑战.
- 生物溶解为金属回收和污泥排毒提供了一个可持续的替代方案.
研究的目的:
- 使用Acidithiobacillus thiooxidans.优化从污水污泥中的铜 (Cu) 生物溶解.
- 评估生物洗污泥的排毒和土壤增强特性.
主要方法:
- 响应表面方法 (RSM) 以优化固体与液体的比率,初始硫和初始pH值.
- 使用缩小核心模型进行动力学研究.
- 毒性特征泄漏程序 (TCLP) 用于污泥分析.
- 种子发芽试验,以评估土壤的改善.
主要成果:
- 在优化条件下获得的最大Cu回收率为85.3% (S/L=0.16%),S0=8.2g/L,pH=1.4).
- 化学反应被确定为铜提取过程中的速度限制步骤.
- 生物化显著降低了重金属的化能力,达到监管处置限制.
- 生物洗污泥改善了土壤质量,提高了种子发芽和生长指数.
结论:
- 酸性菌类 thiooxidans 在铜回收和污泥排毒方面是有效的.
- 优化的生物化条件最大限度地回收铜,最大限度地减少环境风险.
- 生物洗污泥可以安全地处置,并有利地用于改善土壤特性.
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