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Iron filings application to reduce lake sediment phosphorus release

机译：铁锉施加，减少湖泊沉积物磷释放

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Natarajan P, Gulliver JS, Arnold WA. 2021. Iron filings application to reduce lake sediment phosphorus release. Lake Reserv Manage. XX:XXX-XXX.Surface water impairments due to excess phosphorus loading from the watershed and internal recycling from sediments have been reported worldwide. This study investigated the application of iron metal filings to lake sediments as a method to control sediment phosphorus release. Using batch studies, a zero-valent iron filings material was selected for laboratory dosing experiments with lake sediment cores. Iron filings doses of 0 (control), 0.01, 0.1, and 1 g/cm(2) were added to sediment cores collected from a eutrophic lake in Minnesota, United States, to determine the impacts of iron addition on the oxic and anoxic phosphate (PO4-P) flux at 20 C and 10 C in the laboratory. Under oxic conditions, PO4-P release did not occur from the sediments, and low water column PO4-P concentrations were maintained in the iron-dosed and control cores. After switching to anoxic conditions, the 0.1 and 1 g/cm(2) iron doses continued to reduce or fully prevent sediment PO4-P flux. The enhanced supply of iron in the sediments was found to reduce the porewater PO4-P, resulting in no apparent PO4-P diffusion across the sediment-water interface and low PO4-P in the overlying water under oxic and anoxic conditions. Further evaluation using in situ experiments is needed to assess the effectiveness of iron filings addition in sequestering sediment phosphorus under natural conditions.
机译：Natarajan P，Gulliver JS，Arnold Wa。 2021.铁锉施用减少湖泊沉积物磷释放。湖预留管理。 XX：XXX-XXX.Surface水损伤由于来自流域的过量磷，并在沉积物中载入沉积物中的内部回收。本研究调查了铁金属件在湖泊沉积物中的应用作为控制沉积物磷释放的方法。使用批量生学研究，选择零价铁锉材料，用于用湖泊沉积物核心实验室给药实验。将0（对照），0.01,0.1和1g / cm（2）加入到从明尼苏达州明尼苏达州的Eutrophic Lake收集的沉积芯中的铁滤料剂量，以确定铁添加对氧和缺氧磷酸盐的影响（PO4-P）在实验室中20℃和10℃的通量。在氧化条件下，从沉积物中没有发生PO4-P释放，并将低水柱PO4-P浓度保持在铁剂量和控制芯中。切换到缺氧条件后，0.1和1g / cm（2）铁剂量继续减少或完全防止沉积物PO4-P通量。发现沉积物中的铁的增强型铁供应减少了沉积物PO4-P，导致沉积物 - 水界面上没有明显的PO4-P扩散，在氧化和缺氧条件下覆盖物中的低PO4-p。需要使用原位实验进行进一步评估，以评估铁源在自然条件下螯合沉积物中的沉积物的有效性。

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