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Variations in the aluminum:phosphorus binding ratio and alum dosage considerations for Half Moon Lake, Wisconsin

机译：的变化:铝磷绑定比和明矾用量考虑一半月亮湖,威斯康辛州

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摘要

The aluminum:phosphorus binding ratio (A1:P) is an important variable for estimating the Al dosage required to inactivate loosely bound and iron-bound P (redox-P) in sediment for internal P loading control in lakes. For shallow Half Moon Lake, Wisconsin, the A1:P ratio varied in a negative exponential pattern as a function of increasing redox-P concentration. While more Al was needed to inactivate higher concentrations of redox-P, inactivation was more efficient at higher redox-P. The A1:P ratio needed to bind 90% of the redox-P exceeded 150:1 for redox-P concentrations 2.0 mg/g. Competition for binding sites by other constituents in relation to redox-P concentration may be responsible for this pattern. Although organically bound P was not important in Half Moon Lake, it may be in other cases, and lake specific assays are recommended to determine the most appropriate Al dosage. Even then, slower processes of P release from labile organic P and vertical diffusion may not be addressed by higher Al dosages, and more research is warranted. Because redox-P varied horizontally as a result of lake bathymetry, variations in the A1:P ratio were considered for lake-wide alum dose calculation for Half Moon Lake. The estimated lake-wide average dosage of 115 g Al/m2 was high but similar to other recent effective treatments reported in the literature.
机译：铝:磷比率(A1: P)是一种有约束力重要变量估算剂量需要灭活松散铁箍P (redox-P)在沉积物内部P加载控制湖泊。湖,威斯康辛州A1: P比不同负指数模式的函数增加redox-P浓度。灭活需要更高浓度的redox-P,失活是更有效率的redox-P更高。redox-P redox-P超过150:1的浓度 2.0毫克/克。网站由其他成分之间的关系redox-P浓度可能负责这个模式。重要的一半的月亮湖,它可能会在其他情况下,湖特异性的建议确定最合适的剂量。然后,P释放的过程较慢,不稳定有机P和垂直扩散可能不是通过更高的剂量,和更多的研究是十分必要的。由于湖泊水深、变化A1: P比被认为是lake-wide明矾剂量计算一半的月亮湖。估计lake-wide平均剂量的115 g / m2高但类似于其他最近有效治疗方法在文献中报道。

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