Plateau lake polluted water ecological restoration and aquatic ecosystem restoration method

Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a plateau lake polluted water ecological restoration and aquatic ecosystem restoration method. According to the technology, an aluminum salt passivator and a submerged plant restoration technology are combined, bottom mud in-situ passivation is carried out in a polluted area, bottom mud pollutant release is controlled, the nutrient salt content of an overlying water body is rapidly reduced, meanwhile, the transparency of the water body is improved, and beneficial conditions are provided for submerged plant restoration. Then submerged plants are planted in a matched mode, the ecological system of the submerged plants is recovered, the transparency and oxygen content of the water body are further improved, hydrodynamic disturbance is reduced, and the sediment resuspension effect is reduced. In addition, the submerged plants can also absorb nutrient substances in the water body and the bottom mud, release of the nutrient substances from the bottom mud to the water covering body is greatly reduced, and algae growth is inhibited through the allelochemicity effect. After submerged plants die in winter, the passivator can still play a role, and the nutrient salt content of the water body is controlled to be kept at a low level. The passivator and the submerged plants have a synergistic effect to restore the polluted water body, so that a healthy and stable aquatic ecosystem is formed.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for ecological restoration of plateau lake polluted water body and aquatic ecosystem restoration. Background technique [0002] The practice of lake governance at home and abroad shows that when the external source pollution load is reduced, the improvement of lake water quality and the restoration of the ecosystem often lag behind, and it is difficult to see significant results even within 10 years. The main reason for this phenomenon is that after long-term input of exogenous nutrients in the watershed, pollutants such as nutrient salts accumulated in the sediment will be re-released into the water, forming a high endogenous pollution load, making the nutrient salt content of the water body Not high enough. Therefore, the control of endogenous pollution is the necessary basis for lake water pollution control and ecological restoration. Af...

AI Technical Summary

Problems solved by technology

Therefore, endogenous restoration projects such as sediment dredging, which are costly and destructive to the ecosystem, are not suitable for karst plateau lakes.

In addition, karst plateau lakes are often characterized by high pH and high organic matter content. The passivation efficiency of conventional sediment passivators is greatly limited, and it is impossible to effectively control the release of endogenous phosphorus from the sediment, let alone restore Goals for Aquatic Ecosystems

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