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用于复杂的含重金属废水处理的有氧颗粒污泥:特征,性能和机制分析分析

Chong Liu¹, Yao Shen², Yuguang Li¹

¹Key Laboratory of Embalming Methodology and Cosmetology of Cadavers of the Ministry of Civil Affairs, 101 Institute of the Ministry of Civil Affairs, Beijing, China.

Frontiers in microbiology

|February 15, 2024

概括

有氧颗粒污泥有效地从废水中去除铜,和等重金属. 污泥中的细胞外聚合物 (EPS) 在这种吸附过程中发挥着关键作用.

科学领域:

环境科学环境科学
环境工程环境工程
微生物学微生物学

背景情况:

废水中的重金属 (HM) 污染对环境和健康构成重大风险.
有氧颗粒污泥 (AGS) 是一种有希望的,具有成本效益的吸附剂,用于去除HM.
了解AGS在复杂的HM废水中的性能对于有效处理至关重要.

研究的目的:

系统地评估Cu (II),Ni (II) 和Cr (III) 对AGS特性和性能的影响.
阐明复杂的含有HM的废水中AGS的去除机制.
研究HM对AGS微生物群落和细胞外聚合物质 (EPS) 的影响.

主要方法:

福里埃变换红外光谱 (FTIR) 用于化学分析.
诱导合等离子谱学 (ICP) 用于元素定量.
同焦激光扫描显微镜 (CLSM),EPS分数检测和扫描电子显微镜-能量散射X射线 (SEM-EDX) 用于结构和组成分析.

主要成果:

通过离子交换,EPS吸附和内部球吸附,AGS有效地去除了Cu (II),Ni (II) 和Cr (III),近100%的Ni (II) 清除.
三层EPS吸附 (SMP-EPS,LB-EPS,TB-EPS) 是主要的去除机制.
重金属的亲和度和透率按照Cu (II) >Ni (II) >Cr (III) 的顺序进行;HM的添加降低了c-di-GMP水平,抑制了EPS分泌.

结论:

AGS在处理含有HM的复杂废水方面表现出显著的适应性和效率.
EPS吸附,离子交换和内部球吸附是AGS去除HM的关键机制.
该研究提供了对现实世界废水处理挑战的AGS机制的见解.

关键词:

有氧颗粒污泥有氧颗粒污泥复杂的重金属复杂的重金属循环的 diguanylate 的情况.细胞外聚合物质的分子物质分数.基化酶是一种基化酶.移除机制移除机制

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