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Via deep water aeration or hypolimnetic aeration, the oxygen demand of deep water is covered by oxygen from the atmosphere without destroying the lake’s natural stratification. Thus the deep water gets aerobic, the phosphate dissolution is reduced significantly and the mineralization of sediments improves. Years of scientific evidence show that it is possible to keep the deep water aerobic all year round via technical ventilation measures and thereby to recover the natural balance of lakes effectively.〔Steinberg, C., Bernhardt, H.: Handbuch Angewandte Limnologie – 14. Erg.Lfg. 4/0 Verlag: Hüthig Jehle Rehm, 2002, ISBN 3-609-75820-1.〕 == Eutrophication == In stratified, eutrophic lakes an oxygen deficit in deep water is created during summer stagnation. As a result of elevated nutrient inputs the trophic level of many lakes increases continuously. Elevated phosphorus concentrations may lead to stronger algae growth and a corresponding increase in oxygen consumption in the deep zones. In the anaerobic environment of deep water sludge accumulates, while concentrations of ammonium, iron, manganese and toxic hydrogen sulfide increase in the water body. The hypolimnion is now not only hostile, but the anaerobic conditions also cause increased phosphate dissolutions from the sediments into the deep water. These additional nutrient loads create further problems after the next full circulation. Particularly in terms of drinking water production in reservoirs and dams with respect to the existing regulations of the Drinking Water Ordinance,〔Verordnung über die Qualität von Wasser für den menschlichen Gebrauch (Trinkwasserverordnung) vom 21. Mai 2001. Zuletzt geändert durch Art. 3, Abs. 1, 2 vom 5. Dezember 2012. In: BGBl., Teil 1, Nr. 24: 959-969 (2001) und BGBl. I S. 2562 (2012)〕 these deteriorations in water status are a serious problem. The deep water aeration can prevent this process. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hypolimnetic aeration」の詳細全文を読む スポンサード リンク
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