A method for improving the transparency of black and odorous water bodies and promoting the natural growth of submerged plants

Abstract

The invention discloses a method for promoting natural growth of submerged plants by increasing the transparency of a black and odorous water body. According to the method, particulate matters depositing at a mud-water interface are dispersed to overlying water through mechanical or jetting flushing in a relatively closed water body formed by a mud surface and a solid border, and meanwhile overlying water turbulent flow limited by the solid border is formed; turbulent flow contents are adequately washed away by virtue of the overlying water turbulent flow, and therefore, the particulate matters with different particle sizes are further dispersed into the overlying water; particle size gradient distribution is generated under the action of gravity and a fluid force along the direction of gravity; rough particles deposit to cover bottom mud to form a stable deposition layer, and fine particles, namely suspended particles are transferred out of water through flocculent precipitation; and after a certain period of time, the water body can be crystal clear and can meet light conditions of the submerged plants. The submerged plants need to be timely planted in a water area in which submerged plants do not naturally grow in spring or a relatively deep water area so as to gradually restore self-cleaning capacity of the water body, and the conversion of water ecology is promoted.

Description

technical field [0001] The invention relates to a water body eutrophication control and water ecological restoration technology, in particular to a method for improving the transparency of black and odorous water body and promoting the natural growth of submerged plants. Background technique [0002] The black and odorous water body has low transparency (<30cm) and high nutrient level (ammonia nitrogen>8.0mg / L), which is a typical eutrophic water body. There are two typical states in the process of ecological conversion of shallow-water eutrophic water bodies: one is the steady state of grass-type clear water dominated by submerged plants, and the other is the steady state of algal-type turbid water dominated by algae; There may be a "silt water homeostasis" where even algae cannot grow. Judging from the service functions that the water body can provide, the grass-shaped water body has clear bottom, high dissolved oxygen, and good water quality, which has greater serv...

AI Technical Summary

Problems solved by technology

However, reducing the exogenous nutrient load may not achieve ideal results in the short term. Even if the exogenous nutrient input is reduced to the level before the damage to the water area, the water area may not be able to follow the long-term impact of the historical load of sediment accumulation. The expected trajectory returns to the grass-shaped clear water state before it was damaged

Biological regulation is still in the experimental stage, the process is complicated and the cycle is long, and the method adopted should also consider factors such as the interaction between species, the adaptation of biological populations to the geographical environment, and the ecological safety of waters.

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