在变化的溶解氧气可用性下,基于的P修复的寿命和有效性在一个小的环氧湖中变化
Wessam Neweshy1, Dolors Planas2, Nicole Sanderson3
1Département de Chimie, Université Laval, Canada and GRIL (Interuniversity Research Group in Limnology), Canada. raoul.couture@chm.ulaval.ca.
Environmental science. Processes & impacts
|May 20, 2024
概括
兰改性土矿 (LMB) 处理在缩湖中的有效性取决于管理外部 (P) 流和侵蚀. 尽管LMB,季节性P动态仍然存在,这突显了长期P控制的持续流域管理的需要.
科学领域:
- 环境科学 环境科学
- 临界技术 临界技术
- 地质化学 地质化学
背景情况:
- 欧湖经常受到 (P) 污染的影响,导致生态退化.
- 兰改性土 (LMB) 是一种P-结合剂,用于处理这些湖泊.
- 要了解LMB的长期疗效,需要研究湖泊沉积物的P动态.
研究的目的:
- 为了研究一个用LMB处理的湖泊中孔水和的度的季节性变化.
- 量化通过沉积物-水界面的元素流量,并评估在不同的氧化还原条件下P的移动性.
- 确定La-隔离P的埋葬率,并评估影响LMB治疗寿命的因素.
主要方法:
- 从三个不同的地点 (最深处,沿海入水,沿海污水影响) 采集日期的沉积物核心样本,这些沉积物来自一个用LMB处理的环氧化湖.
- 测量孔水酸盐 (PO43--P), (La),铁 (Fe),溶解有机碳 (DOC) 和硫酸盐 (SO42-) 的度.
- 应用一个反向交叉基因模型来量化元素流量和反应速率在沉积物-水界面.
主要成果:
- 水P和Fe表现出强烈的季节性变化,而La度保持稳定.
- 在最深处,P流量显著增加 (20倍),受到夏季和冬季无氧性低气质条件的影响.
- 尽管进行了LMB处理,但P的流动性仍然对氧化还原的波动敏感,在夏季最深处的P产量增加了一百倍,与Fe的流动性同时发生.
- 沉积物年代测定表明,La-bound P以每年2-3毫米的速度被埋葬.
结论:
- LMB处理的有效性取决于控制外部P输入和沉积物侵蚀.
- 季节性氧化还原变化继续影响沉积物孔水中的P动态,即使在LMB应用后.
- 持续管理流域P负荷和侵蚀对于基于LMB的湖泊恢复的长期成功至关重要.
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