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Mine Drainage Residual Additions to Lake Sediments Alter Phosphorus and Trace Metal Distributions

机译:矿井排水残余添加到湖泊沉积物改变磷和痕量金属分布

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A greenhouse microcosm study investigated the impacts of recovered iron oxyhydroxide mine drainage residuals (MDRs) on phosphorus (P) and trace metal distributions at the sediment layer/water column interface in Grand Lake o' the Cherokees, a large reservoir receiving waters impacted by both historic mining and current agricultural land uses. Each mesocosm included 5 kg of lake sediment and 20 L of on-site groundwater. Three treatments were examined in triplicate: control (C) with no additions, low MDR (LM) with 0.3 kg added MDR, and high MDR (HM) with 0.9 kg added MDR. In the first 10 days, aqueous soluble reactive phosphorous (SRP) concentrations decreased likely due to colonizing biomass uptake with no significant differences among the three treatments. LM and HM treatments showed delayed peaks in dissolved oxygen (DO) and lesser peaks in chlorophyll-a (Chl-a) concentrations compared to the C treatment, indicating MDR addition may suppress biomass growth. During days 11 to 138, the C treatment demonstrated increasing pH, decreasing ORP, and biomass decay resulting in significantly increased SRP concentrations. In LM and HM treatments, sufficient P sorption by the MDR maintained low SRP concentrations. Although the MDRs are derived from metal-rich mine waters, all aqueous concentrations were below both hardness-adjusted acute and chronic criteria, except for Pb with regard to the chronic criterion. Metal concentrations in sediments were below the Tri-State Mining District (TSMD)-specific Sediment Quality Guidelines (SQGs). MDR additions may serve as stable long-term P sinks to prevent P release from dead biomass, decrease internal P cycling rates, and mitigate eutrophication, with limited concern for trace metal release.Graphical
机译:温室微观研究调查了回收的羟基氧化物矿山排水残留物(MDRS)对Cherokees沉积物层/水柱界面上的磷(P)和痕量金属分布的影响,这是一个受影响的大型水库接受水域历史矿业和当前的农业用地用途。每个柚木包括5千克湖泊沉积物,20升现场地下水。三份检查三种处理:对照(​​c)没有添加,低MDR(LM),加入0.3kg的MDR和高MDR(HM)加入0.9kg。在前10天中,含水可溶性反应性磷(SRP)浓度可能由于殖民化生物质吸收而降低,并且在三种处理中没有显着差异。与C处理相比,LM和HM处理显示溶解氧(DO)和叶绿素-A(CHL-A)浓度的较小峰值的延迟峰,表明MDR加入可以抑制生物质生长。在第11至138天期间,C治疗表明pH值增加,降低ORP和生物质衰减,导致SRP浓度显着增加。在LM和HM处理中,MDR的足够的P吸附保持低SRP浓度。虽然MDRS来自富含金属矿山水域,但除了关于慢性标准的Pb之外,所有水性浓度低于硬度调节的急性和慢性标准。沉积物中的金属浓度低于三态矿区(台积电)的特价沉积物质量指南(SQGS)。 MDR添加可以用作稳定的长期P水槽,以防止死生物质的P释放,降低内部P循环速率,并减轻富营养化,对痕量金属释放有限。图

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