Repairing method of water body polluting bottom mud

Abstract

The invention discloses a repairing method of water body polluting bottom mud. The water body polluting bottom mud is polluting bottom mud in water bodies of city watercourses and landscape lakes severe in eutrophication. The repairing method includes the following steps of firstly, evenly putting a bottom mud activity covering material with granularity of 1-4 mm in a water body according to the type of main pollutant in the water body and the pollution loads, wherein the covering thickness is 2-6 cm; secondly, planting submerged plants in the water body when the water quality of the water body is remarkably improved and more than one third of the water body in the water depth is improved to be transparent; thirdly, recovering the submerged plants in winter. By means of the method, emission of nitrogen and phosphorus in bottom mud can be effectively reduced, eutrophication of the water body is controlled, the technology implementation process is simple, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of water environment restoration, and in particular relates to a restoration method for water body polluted sediment. Background technique [0002] With the acceleration of industrialization and urbanization in our country, the problem of eutrophication in urban rivers and lakes is becoming more and more serious. Although the government has invested a lot of money in comprehensively improving the water environment and has achieved certain results in limiting discharge and intercepting sewage, the problem of eutrophication in rivers and lakes is still particularly prominent, which has seriously affected people's life and production. Nitrogen and phosphorus are the main limiting factors of water eutrophication, and sediment is the source and sink of nitrogen and phosphorus in river and lake water. Therefore, under the condition that exogenous nitrogen and phosphorus are effectively controlled, controlling the...

AI Technical Summary

Problems solved by technology

The dredging method is widely used in China, but the existing problems are: (1) high cost; (2) damage to the underwater ecosystem; (3) sediment resuspension pollutes the water body; (4) sediment transportation and disposal process cause secondary pollution

However, the amount of pollutants adsorbed by the active material is limited, and the control of nitrogen and phosphorus will fail after the adsorption is saturated. This technology has sustainability defects. In addition, the covering layer is covered by sediment twice, which is also a problem in the practical application of this technology.

[0004] Submerged plants not only have a good effect on reducing nitrogen and phosphorus in polluted sediment and water bodies, but also can effectively inhibit sediment resuspension. However, the growth of submerged plants requires high light conditions and water transparency, and the water body is seriously polluted. The environment is basically not suitable for the growth of submerged plants. Therefore, when simply using submerged plants to remediate polluted sediment, its effect will be affected by its own growth status and water environment factors.

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