塑料颗粒通过改变建筑湿地的核心微生物代谢来影响N2O释放
Xiangyu Yang1, Yi Chen2, Tao Liu2
1Key Laboratory of the Three Gorges Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Campus B, 83 Shabeijie, Shapingba, Chongqing 400044, China; Key Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering, Westlake University, 18 Shilongshan Road, Hangzhou 310024, China; Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Department of Water Management, Faculty of Civil Engineering and Geosciences, Section of Sanitary Engineering, Delft University of Technology, Delft 2628 CN, the Netherlands; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
各种大小的塑料颗粒减少了建筑湿地 (CWs) 中的氧化 (N2O) 排放,纳米塑料显示了最强的效果. 这些发现为塑料污染减缓战略提供了洞察力.
科学领域:
- 环境科学 环境科学
- 环境工程 环境工程
- 生态毒理学 生态毒理学
背景情况:
- 建筑湿地 (CWs) 有效地固定塑料颗粒.
- 不同塑料颗粒大小对CW中氧化 (N2O) 释放的影响尚不清楚.
- 了解干预机制对于优化CW至关重要.
研究的目的:
- 调查宏观,微型和纳米尺寸塑料颗粒对CW中N2O释放的影响.
- 阐明塑料颗粒影响N2O生产途径的机制.
- 评估CW作为塑料污染管理的生态技术的潜力.
主要方法:
- 实验室规模的湿地模型被建立并用100μg/L的塑料颗粒 (宏,微,纳米大小) 处理了370天.
- 对氧化 (N2O) 的释放进行了监测.
- 使用同位素追踪 (15N和18O) 来确定N2O生产途径,包括无氧化和脱化. 还分析了酶活动和基因丰度.
主要成果:
- 所有测试的塑料颗粒大小都显著减少了N2O的释放,纳米塑料表现出最强的效果,其次是微型和宏观塑料.
- 氨氧化被确定为主要的N2O生产途径,其次是脱化. 塑料暴露改变了化合脱和化剂脱的贡献.
- 机制涉及对碳同化 (RubisCO活性),氨氧化 (阿莫基因丰度和HAO活性) 以及N-离子转膜和还原酶活性的影响.
结论:
- 塑料颗粒,特别是纳米塑料,可以有效地减少建筑湿地的N2O排放.
- 塑料颗粒影响了调节N2O生产的关键微生物过程,提供了一个新的干预策略.
- 这项研究提供了关于建筑湿地在减轻塑料污染及其相关温室气体排放中的作用的宝贵见解.
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