Biochemical Oxidation of Polluted Lake Sediment with Nitrate - A New Lake Restoration Method
Biochemical Oxidation of Polluted Lake Sediment with Nitrate - A New Lake Restoration Method
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发表时间：
2016
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通讯作者：
W. Ripi
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作者：
W. Ripi
本文介绍了一种受污水污染的湖泊的修复方法。该方法基于通过合适的氧化剂对沉积物进行原位氧化。将氯化铁、熟石灰和硝酸钙等化学物质注入沉积物中，提高了对磷的结合能力，减少了易降解有机物的数量。因此，减少了营养物质向水体的循环，以及沉积物表面的生物需氧量（BOD）。在瑞典Lillesjon湖，1975年夏季，营养水平急剧下降，底部附近水域的氧气条件得到改善。该方法比沉积物疏浚方法成本更低，速度更快。可以处理需氧量高的沉积物的限制区域，从而避免从这些受污染的沉积物中回收磷。许多湖泊，特别是位于人口稠密地区附近的湖泊，被用作不同污染源造成水质退化的接收器。根据大小、水文和地貌条件，这些湖泊迟早会遭到破坏。这些湖泊往往成为一个环境公害，因为在缺氧期间，H2S的发展和鱼类死亡的发酵过程。
A method for restoration of lakes which have been polluted by sewage is described. The method is based on the in situ oxidation of sediments by means of suitable oxidation agents. The chemicals, iron chloride, slaked lime and calcium nitrate, were injected into the sediments, improving the binding capacity for phosphorus and reducing the amounts of easily degradable organic matter. The nutrient recycling to the water body, as well as the biological oxygen demand (BOD) at the sediment surface, were thus reduced. In Lake Lillesjon, Sweden, a drastic reduction of the nutrient levels and an improvement of the oxygen conditions in the water near the bottom during summer 1975 were achieved. The method is less expensive, and more rapid than sediment dredging methods. Restricted areas of sediments with high oxygen demand can be treated, and the recycling of phosphorus from these polluted sediments thus avoided. Many lakes, especially those situated in the vicinity of densely populated areas, have been used as receivers for water degraded by different sources of pollution. Depending on size, hydrological and morphometrical conditions, the lakes have sooner or later been damaged. These lakes often become an environmental nuisance because of fermentation processes during anoxic periods, H2S development and fish deaths.