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在使用稳定同位素的缓慢沙中探索碳动态

Bayan Khojah¹, Salima Sadeghi¹, Lubos Polerecky¹

¹Department of Earth Sciences, Utrecht University, Princetonlaan 8a, Utrecht 3584 CB, the Netherlands.

|February 19, 2025

概括

稳定的同位素显示,缓慢的沙过器 (SSF) 中的细菌在整个过床中迅速消耗有机物质. 这种细菌吸收,而不是矿化,是主要的去除机制,突出显示出同位素分析对了解SSF过程的潜力.

科学领域:

环境科学环境科学
水处理处理水的方法
微生物学微生物学

背景情况:

慢砂过 (SSF) 是一种长期以来的,具有成本效益的生物过方法,用于生产安全的饮用水.
虽然已知生物活性可以在SSF中去除有机物质 (OM),但其定量贡献仍然不明确.
研究生物过程的作用对于优化SSF效率和了解水净化至关重要.

研究的目的:

量化评估生物活动在使用稳定同位素的运行缓慢沙子过器内有机物去除中的作用.
区分OM保留,矿化和微生物吸收作为去除机制.
探索稳定同位素技术的潜力,以研究SSF中的微生物过程.

主要方法:

结合自然丰富度稳定同位素测量 (碳池) 和实验室化,使用SSF核心上的C标记葡萄糖.
溶解和固体有机和无机碳的量化度和同位素组成.
在沙子过器矩阵中追踪了标记葡萄糖在14天内的命运.

主要成果:

有证据表明,OM保留和矿化都发生,但它们的相对贡献并未准确地确定自然丰富的同位素.
在整个沙柱中,C标记的葡萄糖被快速移除,明显超过过器的有机碳加载率.
细菌吸收是主要的去除途径,其中很大一部分可能被存储为碳储备,而不是立即矿化. 草地动物放牧发挥了较小的作用.

结论:

稳定同位素标记实验表明,细菌吸收是SSF中快速去除有机物质的主要机制,在整个过器中发生.
该研究证实了稳定同位素技术在SSF系统中阐明微生物过程方面的巨大潜力.
未来的研究应该利用更长期的同位素标记和更全面的同位素监测,以完全限制OM矿化率和微生物社区动态.

关键词:

生物过是一种生物过.生物活动是生物活动.碳同位素是碳的同位素之一.饮用水生产饮用水的生产.有机物去除有机物去除

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