在连续无氧/有氧生物反应器中长期暴露于非生物降解和生物降解的微塑料的影响:去除性能,微生物群落和功能基因反应
Bing Yao1, Min Liu1, Jin Zhang2
1College of Architecture and Environment, Sichuan University, Chengdu, 610065, China.
Journal of environmental management
|December 15, 2024
概括
生物降解的微塑料 (MPs),像聚乳酸,显著损害了污水处理生物反应器中的去除. 这些塑料颗粒会损害微生物健康,降低处理效率,对废水处理过程构成风险.
科学领域:
- 环境科学 环境科学
- 环境微生物学 环境微生物学
- 废水处理工程 废水处理工程
背景情况:
- 微塑料 (MP) 构成环境风险,但它们对污水处理生物反应堆的长期影响尚不清楚.
- 研究了非生物降解 (聚乙烯二甲 - PET) 和生物降解 (聚乳酸 - PLA) 的MP.
- 使用无氧/有氧 (A/O) 工艺,这是传统的废水处理方法.
研究的目的:
- 研究PET和PLA微塑料对A/O生物反应器中去除的影响.
- 评估微塑料对微生物活动和社区结构的影响.
- 评估在废水处理中与生物降解的MPs相关的风险.
主要方法:
- 与PET和PLA在不同度 (10和100毫克/升) 的除效率的比较.
- 使用腺三酸盐 (cATP) 和脱酶试验测量微生物活性.
- 与转化相关的微生物群落和功能基因丰度 (amoA,amoB,amoC) 的分析.
主要成果:
- 与聚乙烯二甲 (PET) 相比,聚乳酸 (PLA) 显著降低了氨- (NH4+-N) 清除效率.
- PLA降低了微生物活性 (cATP,脱酶) 并增加了氧化应激,损害了微生物.
- 酸减少了关键的转化微生物和基因的丰富性.
结论:
- 像PLA这样的生物降解MP对废水处理过程的长期性能构成重大风险.
- 不能忽视PLA对微生物群落和去除的有害影响.
- 需要进一步强调可生物降解的MPs在环境应用中的潜在风险.
更多相关视频
相关概念视频
Bioremediation
18.2K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.2K
Environmental Applications of Microorganisms
1
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
1
Metabolism of Chemolithotrophs
1
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.
1


