微生物群和遗传潜力,以减少建筑湿地中生物炭的氧化排放量
Jun-Feng Wang1, Ze-Xiang Cai1, Yi-Hao Li2
1Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, PR China.
The Science of the total environment
|August 23, 2023
概括
将生物炭添加到建造的湿地中,在脱过程中显著减少了氧化 (N2O) 排放. 这项研究强调了生物碳.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 废水处理 废水处理
背景情况:
- 在排过程中,建筑湿地 (CWs) 的氧化 (N2O) 排放是污水处理中的生态问题.
- 脱过程受基质类型和有机负荷的影响,可以导致N2O生产.
研究的目的:
- 为了比较CW中的石,天然和生物炭基质在脱过程中对N2O生成的影响.
- 研究化学氧气需求 (COD) 与酸盐 (NO3--N) 的比例如何影响N2O排放和微生物群落.
- 在不同的基质条件下评估N2O生产的遗传潜力.
主要方法:
- 采用石 (CW-B),采用天然石 (CW-BF) 的石和采用生物炭 (CW-BC) 的石建造了三种类型的CW.
- 热水在不同的COD/NO3-N比率下运行,以模拟不同的污水处理条件.
- 使用分子技术分析了微生物群结构和N2O世代的遗传潜力.
主要成果:
- 生物炭和天然矿增强了COD和NO-N的去除,特别是在COD/NO-N比率为9.
- N2O排放主要与酸盐- (NO2--N) 积累有关,CW-BC与CW-B和CW-BF相比显示出明显较低的流量 (54.0-293.3 μg/h)
- 生物炭添加显著减少了N2O排放,并丰富了nosZ基因的丰富性,这对于减轻N2O生产至关重要.
结论:
- 生物炭通过改变微生物群落并增强脱化的遗传潜力,有效地减少了CWs的N2O排放.
- 天然矿也改善了污染物去除,但与生物炭相比,对N2O排放的抑制作用不那么明显.
- 这些发现表明,生物炭是可持续污水处理的有希望的材料,最大限度地减少温室气体的产生.
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