细胞外聚合物质对斯特鲁维特结晶的核化和生长动力学的调节作用
Liubing Ling1,2,3, Haiyan Wu1,2,3, Liangqiu Huang1,2,3
1Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin, People's Republic of China.
Environmental technology
|February 22, 2026
概括
废水污泥中的细胞外聚合物物质 (EPS) 分数有不同的影响于斯特鲁维特结晶. 松结合的EPS (LB-EPS) 有助于核形成,而紧密结合的EPS (TB-EPS) 则促进晶体生长,影响回收.
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:
- 斯特鲁维特 (MgNH4PO4·6H2O) 结晶对于废水系统中的回收和规模控制至关重要.
- 活性污泥中的细胞外聚合物 (EPS) 可以影响矿物沉过程.
- 了解不同EPS分量的作用是优化 struvite形成的关键.
研究的目的:
- 研究可溶性 (S-EPS),宽松结合 (LB-EPS) 和紧密结合 (TB-EPS) 分数对 struvite 均质核和生长动力学的不同影响.
- 在受控条件下阐明EPS分数修改 struvite结晶的机制.
主要方法:
- 从城市活性污泥中提取S-EPS,LB-EPS和TB-EPS.
- 在恒定的pH和成分下监测斯特鲁维特诱导时间 (IT),核化速率 (NK) 和生长速率 (K).
- 使用富里埃变换红外光谱 (FTIR),X射线衍射 (XRD),扫描电子显微镜 (SEM) 和X射线光电子光谱 (XPS) 进行EPS修饰的斯特鲁维特晶体的表征.
主要成果:
- LB-EPS显著缩短了诱导时间和增加了核化速率,促进了核形成.
- 结核病-EPS延长了诱导时间,但增强了晶体生长,产生了更规律的晶体结构晶体.
- S-EPS 仅对 struvite 核和生长动力学产生轻微影响.
- 证实了EPS与晶体表面的相互作用,主要是通过含氧和含的组,而不会改变斯特鲁维特相.
结论:
- 不同的EPS分数对 struvite核和生长产生不同的影响,影响结晶动力学.
- 与晶体表面的EPS相互作用在斯特鲁维特形成过程中修改接口过程中发挥着关键作用.
- 这些发现为控制回收和减轻废水处理中的缩放提供了洞察力,通过对EPS进行量身定制的管理.
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