The aim of the study was to assess the efficiency of mineral aggregates in orthophosphate (OP) removal from hypolimentic water (HW) withdrawn from eutrophic lakes. Four P reactive materials were tested in sorption experiments: light weight expanded aggregate (LECA), zeolite (ZL), dolomite (DM) and limestone (LS). The two materials proved to be most effective in OP binding were LS and LECA. For these agents we conducted further investigations to reveal the effect of variable pH and temperature in the range commonly found in HW withdrawn from eutrophic lakes (6.0–8.0 and 5–15 °C, respectively). Kinetic studies under varying OP concentrations (0.1–2.0 mg PO₄³⁻ L⁻¹) in synthetic solutions and HW were involved to check influence of hypolimnion chemistry on OP fixation. LS was the most efficient in OP removal, followed by LECA, dolomite and zeolite. OP sorption by LS and LECA increased with decreasing pH and increasing temperature and was faster and higher in HW as compared to standard solution. The results indicate that OP fixation onto these materials would be most efficient in case of lakes with acidic and relatively warm bottom layer. Hypolimnion warming, which is often observed in restored lakes, will further enhance OP removal. Use of LS mixed with LECA was recommended for a potential treatment of HW withdrawn from eutrophic lakes. OP retention before hypolimnion transport downstream can mitigate side effects of hypolimnion removal by preventing eutrophication of receiving water bodies which can be regarded as substantial improvement of this lakes` restoration method.

该研究的目的是评估从富营养化湖泊中提取的低磷水（HW）中正磷酸盐（OP）去除矿物质聚集体的效率。在吸附实验中测试了四种P反应性材料：轻质膨胀骨料（LECA），沸石（ZL），白云石（DM）和石灰石（LS）。被证明对OP结合最有效的两种材料是LS和LECA。对于这些试剂，我们进行了进一步的研究，以揭示在富营养化湖泊中提取的HW中常见的pH和温度变化范围（分别为6.0–8.0和5–15°C）的影响。在不同OP浓度（0.1–2.0 mg PO ₄ ^3- L ^-1下的动力学研究）和HW参与，以检查次氯酸化学对OP固定的影响。LS是去除OP最有效的方法，其次是LECA，白云石和沸石。与标准溶液相比，LS和LECA对OP的吸附随pH值降低和温度升高而增加，并且在HW中更快，更高。结果表明，在湖泊具有酸性且相对较暖的底层的情况下，将OP固定在这些材料上将是最有效的。在恢复的湖泊中经常观察到的肥大化增温将进一步促进去除有机磷。建议将LS和LECA混合使用，以治疗从富营养化湖泊中提取的HW。