藻类-细菌系统中的Fe3+压力:化抑制,铁的分布和微生物耐受性
Zihua Yang1, Yang Lei1, Jin Pei1
1College of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China.
Environmental research
|October 25, 2025
概括
将铁 (Fe3+) 添加到废水系统可以通过影响关键细菌来损害氨去除. 谨慎的铁剂量是维持有效的生物营养物质去除过程的关键.
科学领域:
- 环境微生物学环境微生物学
- 废水处理工程 废水处理工程
- 生物地质化学生物地质化学
背景情况:
- 下水道腐蚀控制和化学去除通常会将铁 (Fe3+) 引入废水中.
- 3+对藻类-细菌系统内的复杂相互作用的影响尚未完全理解.
研究的目的:
- 综合评估不同Fe3+度对藻类-细菌废水处理系统中营养物质的去除,铁的分布和微生物群落结构的影响.
主要方法:
- 藻类-细菌微观世界用不同的Fe3+度 (0.2,2,8,32 mg/L) 进行了处理.
- 监测了营养物质的去除效率 (COD,,NH4+-N).
- 分析了微生物聚合物和细胞外聚合物质 (EPS) 中的铁分布.
- 使用分子技术评估了与营养循环相关的微生物社区组成和基因表达.
主要成果:
- 氧化碳和去除不受Fe3+添加的影响.
- 在Fe3+度超过8mg/L时,氨 (NH4+-N) 的去除显著减少,这与尼索马斯抑制有关.
- 铁主要以Fe-P和FeOOH的形式沉,以S-EPS,TB-EPS和LB-EPS的形式积累.
- 一些微生物,包括Nitrospira,聚酸盐积聚生物 (PAO),糖原积聚生物 (GAO) 和绿藻,表现出对铁应激的耐受性.
- 参与脱和光合作用的基因被上调,而与相关的基因 (ppk,ppx) 被下调.
结论:
- 高度Fe3+ (>8 mg/L) 通过抑制关键的化细菌,对生物氨去除产生负面影响.
- 微生物聚合物和EPS中的铁积累会影响系统性能.
- 虽然一些微生物群体表现出弹性,但整体生物营养物质的去除需要在废水处理中仔细管理铁剂量.
相关概念视频
Other Stress Responses in Bacteria
308
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
308
Stringent Response in E. coli
254
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
254
Metabolism of Chemolithotrophs
707
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
707
Microbial Nutrition
997
Organisms exhibit remarkable metabolic diversity, categorized based on how they acquire energy and carbon. These strategies enable survival in various ecological niches and are essential for maintaining energy flow and nutrient cycling within ecosystems.Energy and Carbon SourcesOrganisms are classified as phototrophs or chemotrophs based on energy acquisition. Phototrophs use light as their energy source, while chemotrophs rely on oxidizing chemical compounds. Further differentiation arises...
997
Inorganic Nitrogen Assimilation
421
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
421


