Lake restoration by hypolimnetic Ca(OH)2 treatment: impact on phosphorus sedimentation and release from sediment.
Lake restoration by hypolimnetic Ca(OH)2 treatment: impact on phosphorus sedimentation and release from sediment.
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DOI：
10.1016/j.scitotenv.2011.01.006
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
M. Dittrich;O. Gabriel;Christian Rutzen;R. Koschel
中科院分区：
文献类型：
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作者：
M. Dittrich;O. Gabriel;Christian Rutzen;R. Koschel
1996-1998年期间，在德国富营养化的卢津湖，采用全湖水相Ca（OH）2添加，诱导碳酸钙沉淀，并结合深水曝气。本文研究了污水处理前后悬浮物和沉积物中磷及其结合形态的动态变化。磷的沉积速率增加三年内诱导方解石沉淀。沉淀物中磷的结合形式向方解石结合磷转变。方解石结合的P在沉降材料中的增加不符合最大诱导CaCO 3沉淀所造成的hypolimnetic除了Ca（OH）2。通过沉积物岩心培养和泥浆实验研究了化学添加剂和pH值对悬浮物和表层沉积物中磷结合形式的影响。实验室研究表明，沉积物中最低的磷通量与Ca（OH）2调节的上覆水pH=7的实验有关。用Ca（OH）2调节pH导致较低的P通量为2.3mgPm−2d−1，而最高的P通量归因于用NaOH调节pH的实验。反映表层沉积物中磷与碳酸盐结合状态的磷组分在一年的时间内增加，增强了沉积物对磷的截留能力。
A whole-lake hypolimnetic Ca(OH)2addition, that induced calcium carbonate precipitation, combined with deep water aeration has been applied to eutrophic Lake Luzin, Germany during 1996–1998. In this study we investigated the dynamic of phosphorus and its binding forms in seston and sediment before and during the treatment. The sedimentation rates of phosphorus increased within three years of induced calcite precipitation. The phosphorus binding forms shifted to the calcite-bound phosphorus in the settling matter. The increase of calcite-bound P in the settling material did not coincide with the maximum induced CaCO3-precipitation caused by the hypolimnetic addition of Ca(OH)2. An impact of chemicals additions and pH on phosphorus binding forms in seston and surface sediments has been studied in laboratory experiments with sediment core incubations and slurry experiments. Laboratory studies showed that the lowest phosphorus flux from sediment was related to the experiment with pH=7 in overlaying water adjusted with Ca(OH)2. The adjusting of pH with Ca(OH)2leads to a lower P flux of 2.3mgPm−2d−1, while the highest P-flux is attributed to the experiment with the pH which was adjusted with NaOH. Phosphorus fraction which reflects phosphorus binding on carbonates in surface sediments increased within one year of treatment, enhancing the phosphorus retention capacity of sediments.