A kind of aeration device and aeration method for strengthening the controlled release of endogenous nutrient salt for sediment restoration

Abstract

The invention discloses a sediment repair aeration device for intensifying controlled release of endogenous nutrients. The sediment repair aeration device comprises an air-deflector, a submerged pump arranged inside the air-deflector, a venturi tube, an air suction pipe and at least two gas-water drainage pipes, and a control cabinet arranged outside the air-deflector, wherein one end of the venturi tube is communicated with the submerged pump; the venturi tube is communicated with the venturi tube, and extends upwards to outside of the air-deflector; the gas-water drainage pipes are communicated with the other end of the venturi tube; the gas-water drainage pipes are symmetrically arranged at the other end of the venturi tube, and stretch towards two sides to form a wing structure; the control cabinet is connected with the submerged pump through a cable. The invention also discloses an aeration method, the aeration process can be optimized and controlled according to the hydrodynamic characteristic and the dynamic change, the dissolved oxygen level and reasonable distribution of the hypoxic microenvironment in the system are facilitated, and effective controlled release of the endogenous nutrients is achieved.

Description

technical field [0001] The invention relates to the technical field of ecological environment, in particular to a bottom mud restoration aeration device and an aeration method for strengthening the controlled release of endogenous nutrient salts. Background technique [0002] Bottom mud (sediment) is an important part of the water environment, and it is also an important link and interface of the geochemical cycle of nutrient-rich substances in rivers and lakes. After the exogenous pollution is effectively controlled, the release of endogenous nutrients from the sediment often becomes the main cause of eutrophication and black odor in the water body. The control of endogenous nutrients in the sediment has become an important part of the eutrophication control and ecological restoration of rivers and lakes. content. [0003] At present, the endogenous controlled release technologies of sediment mainly include sediment dredging, sediment passivation, in-situ covering of sedim...

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Problems solved by technology

[0006] In the past, microporous aeration devices were mostly used for sediment repair aeration, and the oxygenation process was completed by sending air to the underwater air distribution pipe through a fan or an air compressor. Regulating the aeration process according to the hydrodynamic characteristics and its dynamic changes often leads to excessive aeration, which is not conducive to the coupling process of endogenous nitrogen nitrification-denitrification and endogenous phosphorus "anaerobic phosphorus release" and "aerobic phosphorus uptake" , thereby affecting the controlled release of endogenous nutrients in the sediment

[0007] Although researchers have begun to pay attention to the influence of aeration disturbance on the behavior of endogenous nutrients in sediment, the process analysis is only limited to the suspended sediment produced by aeration, which is beneficial to the adsorption and removal of pollutants in the overlying water body, and there is no Considering that the disturbance and suspension of the sediment will lead to turbidity or even black odor of the overlying water and the blockage of the aeration equipment, there is no process regulation of the aeration disturbance to promote the reasonable distribution of the dissolved oxygen level and the anoxic microenvironment in the system, so as to strengthen the bottom. The controlled release of mud endogenous nutrient salts, and the use of microporous aeration devices, need to install fans or air compressors by arranging fixed oxygenation stations or mobile oxygenation platforms (aeration boats) on the banks of rivers and lakes. The air at a certain pressure makes the operation process noisy, the underwater installation of the air distribution pipe is complicated, the construction accuracy is high, and it is easy to be blocked by the disturbed suspended sediment

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