The influence of aeration by the method of destratification on improving the content of oxygen dissolved in water
The problems of water quality are related to the decrease in the dissolved oxygen content, particularly in the lower layers 1. The immediate consequences are varied and can include the formation of iron and manganese solution and suspension compounds, methane, hydrogen sulfide, ammonia, phosphorus, and which cause to fish killing, accelerated internal recycling of nutrients, solubilization of metals, and provoke also taste and odor problems that are undesirable in water supplies 2. The main purpose of this study is to show the effect of destratification technique to improve the concentration of oxygen dissolved in the depths of the lake. The 10.3 km2 of the water of Lake Hallwil are an important tourist center for the canton of Lucerne (Switzerland).Before its restoration in the winter of the year 1985/1986, this lake eutrophication showed significant disruption of aquatic activities, and pollution damage to its various uses, and thus inhibited the development of tourism in the region. For this, EAWAG, to address the eutrophication of Hallwil lake, put into service in the winter of 1985/1986, an installation of a aeration system in two alternate modes of aeration namely by a aeration system in winter destratification and aeration hypolimnètic in summer (air/pure oxygen) 3. The average value of oxygen dissolved is found in the range of allowed values are: -Winter Season: O2min ≥ 6 g/m3 g/m3 The technique of destratification aeration system has contributed dramatically in the way operational oxygen dissolved improves in the deep layers of the lake.
aeration eutrophication technique of destratification dissolved oxygen technique of restoration lake
Gafsi M. Kettab A.
Laboratoire de Recherches de Génie Civil : LRGC, Equipe de Recherches de Ressources Hydriques, Unive Laboratoire de Recherches en Sciences de leau : LRS-EAU/ENP Ecole Nationale Polytechnique, El Harra
国际会议
北京
英文
287-292
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）