Method for treating enriched surface water

Abstract

The method of treating eutrophic surface water includes the following successive steps: 1. making carrier via setting foam grains homogeneously inside the flat cloth bag of height less than 6 cm; 2. pre-cultivating ryegrass via soaking seed, cultivating in cultivation tank at 28-32 deg.c for 22-26 hr, seeding on soaked carrier and cultivating to form lawn; and 3. treating eutrophic surface water via transferring the lawn with ryegrass of 7-10 cm height to the treated water area for root system of ryegrass to absorb excessive eutrophic nitrogen and phosphate from water. The said method can reduce nitrogen and phosphate contents in polluted water area fast to purify water and produce no secondary pollution.

Description

technical field [0001] The invention relates to a method for treating eutrophic surface water. Background technique [0002] Eutrophication of water body has gradually become one of the most concerned environmental issues by the governments and the public in many contemporary countries. According to a survey by the United Nations Environment Program (UNEP), 30%-40% of lakes and reservoirs worldwide have been affected by eutrophication in varying degrees. In China, due to the increasing population and the rapid development of industry and agriculture, a large amount of nutrient-rich sewage is directly discharged into various water bodies without any treatment, which leads to the acceleration of the eutrophication process. Among the 131 major lakes in my country, 67 lakes have reached the eutrophic level, accounting for 51.2%; among the 39 representative reservoirs, 12 have reached the eutrophic level, accounting for 30%. Among the five major freshwater lakes, Taihu Lake, Ho...

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Problems solved by technology

However, its disadvantage is that the seasonal growth of aquatic plants is relatively obvious, which will directly affect the restoration effect.

Generally, aquatic plants grow vigorously in spring and summer, but their growth rate tends to decrease significantly or even die in autumn and winter, especially in winter when the temperature is low, which leads to a significant decrease in the ability of aquatic plants to absorb pollutants in wastewater. Coupled with the humification of dead aquatic plants such as fallen leaves and residual branches, these are the reasons why the eutrophication of water bodies in autumn and winter is more serious than that in high temperature seasons. At this time, traditional ecological restoration techniques cannot achieve the desired effect.

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