中国地质大学(武汉)地质微生物与环境全国重点实验室
纸质出版:2026
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王培源, 童曼, 张鹏. 地下水位波动驱动的沉积物充放电规律与机制[J]. 地质科技通报, 2026,45(2):240-248.
王培源, 童曼, 张鹏. 地下水位波动驱动的沉积物充放电规律与机制[J]. Bulletin of Geological Science and Technology, 2026, 45(2): 240-248.
王培源, 童曼, 张鹏. 地下水位波动驱动的沉积物充放电规律与机制[J]. 地质科技通报, 2026,45(2):240-248. DOI: 10.19509/j.cnki.dzkq.tb20240788.
王培源, 童曼, 张鹏. 地下水位波动驱动的沉积物充放电规律与机制[J]. Bulletin of Geological Science and Technology, 2026, 45(2): 240-248. DOI: 10.19509/j.cnki.dzkq.tb20240788.
地下环境中生物地球化学反应的本质是电子转移。沉积物是地下环境中重要的电子储库,在水位波动驱动下可进行循环的电子储存与释放,显著影响地下环境中的物质转化和元素循环。然而,目前对于地下水位波动驱动的沉积物充放电规律及机制仍缺乏认识。本研究构建了一维土柱体系模拟地下水位波动带,结合化学分析、铁矿物形态分析和分子生物学技术,探究了水位波动驱动的沉积物充放电规律与机制。结果表明,在短周期波动模式下,沉积物可以完成2次充放电循环,最大充放电量分别为2.3
8μmol e
-
·g
-1
,最大充放电速率为0.577
2.012μmol e
-
·g
-1
·d
-1
。沉积物的给电子容量(EDC)主要由吸附态、离子交换态和高活性弱结晶态Fe(Ⅱ)贡献。水位波动通过驱动Fe(Ⅲ)生物还原-Fe(Ⅱ)化学氧化实现沉积物的充放电循环。随着还原-氧化反应的循环,铁氧化物的生物可利用性降低,导致沉积物无法持续充放电。电子穿梭体蒽醌-2
6-二磺酸(AQDS)的输入初期显著提高了充放电速率,但加速了Fe(Ⅲ)生物可利用性的降低,最终使充放电速率逐渐下降,充放电循环在第3周期停止。电子供体乳酸钠的输入显著富集了铁还原菌Anaeromyxobacter,维持了Fe(Ⅲ)的高生物可利用性,使沉积物的充放电速率显著提高,在水位波动下能进行持续的充放电循环。本研究揭示了不同水位波动条件下沉积物充放电行为的变化规律及其控制机制,为地下水污染防控提供了新的策略。
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