在不同碳来源的脱生物膜系统中减少的性能和机制
Ge Cao1, Junzhi Gao1, Jinxin Song1
1School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
The Science of the total environment
|September 23, 2023
概括
该研究调查了不同碳来源如何影响使用脱生物膜反应器减少 (VI) [Cr (VI) ]. 复合碳来源 (酸盐和葡萄糖) 实现了99.5%的Cr (VI) 去除,显示出优异的性能和微生物适应性.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 六价 (Cr(VI)) 的生物还原对于环境修复至关重要.
- 不同碳来源对Cr (VI) 减少效率和机制的影响仍未得到充分研究.
研究的目的:
- 研究不同碳来源对Cr (VI) 减少在脱化生物膜反应堆中的影响.
- 阐明碳源介导的Cr (VI) 减少和微生物群落适应背后的机制.
主要方法:
- 运行四个具有不同碳来源的脱化生物膜反应堆:葡萄糖 (C6H12O6),酸 (CH3COONa),甲醇 (CH3OH) 和复合物 (CH3COONa:C6H12O6 1:1).
- 在75mg/L的剂量度下,长期监测Cr(VI) 除去效率.
- 对毒性反应,细胞外聚合物物质 (EPS) 变化,功能组,电子转移和微生物社区结构的分析.
主要成果:
- 复合碳来源 (CH3COONa:C6H12O6) 实现了最高的Cr (VI) 去除效率 (99.5%),具有出色的稳定性.
- 降解效率按照以下顺序进行:复合物 > 葡萄糖 > 酸 > 甲醇.
- 甲醇表现出最低的竞争力,导致系统失衡并减少了Cr (VI) 的减少.
- 复合碳来源中的微生物群体表现出对有毒环境的快速适应,其中*Trichococcus*占43.6%,并对脱和Cr (VI) 减少做出了重大贡献.
结论:
- 碳源类型显著影响Cr (VI) 的生物降解性能和微生物群落动态.
- 复合碳来源对于稳定高效的Cr6去除是非常有效的.
- 微生物适应,EPS修饰和电子转移是通过脱生物膜减少Cr (VI) 的关键机制.
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