Water quality purification and water ecological restoration method of polluted municipal internal lake

Abstract

The invention discloses a water quality purification and water ecological restoration method of a polluted municipal internal lake. The method disclosed by the invention comprises the following steps:1) setting a rain and sewage pre-treatment purification region at a a location where an along-river rainwater outlet or a mixed discharging sewage overflowing opening of an into-lake river channel isconverged with a river channel; 2) carrying out micro-topography water ecology construction in the lake, wherein the micro-topography water ecology construction comprises the step of sequentially constructing a shallow-water submerged plant recovery region, a gentle slope transition region and a deep water regulation and storage region from a lakeside to the middle of the lake; planting submergedplants into the submerged plant recovery region; 3) arranging a circulating water pump in the middle of the lake or the deep water regulation and storage region and arranging a circulating pipeline at the bottom of the lake. The water quality purification and water ecological restoration method of the polluted municipal internal lake is applicable to environment management on pipe network overflowing polluted and town surface runoff polluted municipal internal lake water with a high into-lake load and can be used for remarkably improving the water quality of the lake, reducing the eutrophication degree of the lake and recovering a water ecological landscape.

Description

technical field [0001] The invention relates to a method for water quality purification and water ecological restoration of inner lakes in polluted cities. Background technique [0002] As the receiving body of urban surface runoff and even surrounding domestic sewage, urban inner lakes cause the accumulation of organic matter, nitrogen, phosphorus and other nutrients in the water; moreover, most of the water bodies are closed and slow-flowing water bodies with static or poor fluidity, and the general water environment capacity is small and the water bodies are self-purifying The capacity is low. During the rainy season, the pipeline sediments are washed and overflowed into the river, and the bottom of the river settles. Under anaerobic conditions, hydrogen sulfide, ammonia and other odorous gases are produced. However, it shows severe eutrophication and large-scale outbreak of blue-green algae, which seriously affects the quality of urban water environment and water ecologi...

AI Technical Summary

Problems solved by technology

[0002] As the receiving body of urban surface runoff and even surrounding domestic sewage, urban inner lakes cause the accumulation of organic matter, nitrogen, phosphorus and other nutrients in the water; moreover, most of the water bodies are closed and slow-flowing water bodies with static or poor fluidity, and the general water environment capacity is small and the water bodies are self-purifying The capacity is low. During the rainy season, the pipeline sediments are washed and overflowed into the river, and the bottom of the river settles. Under anaerobic conditions, hydrogen sulfide, ammonia and other odorous gases are produced. However, it shows severe eutrophication, and large-scale outbreaks of blue-green algae have seriously affected the quality of urban water environment and water ecological landscape.

[0003] Although point source pollution such as sewage in the dry season has been controlled, the pollution of the urban underlying surface is still very serious. A large amount of pollutants flow into the lake (river) with the surface runoff generated by rainfall. The lake has the function of regulating storage and drainage, but because of the deep water depth of the lake, it is not suitable for the growth of submerged plants that have a strong inhibitory effect on algae. Under certain conditions, the algae in the lake multiply in large numbers, and the lake is in a state of eutrophication

In addition, the water system is a rain source type, and the lake is in a state of stagnant water in concave bends or connected branches. The lake has almost no water flow, which further aggravates the degree of eutrophication

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