Polluted water body deposit environment-friendly dredging depth determination method

Abstract

The invention provides a determining method for polluted water bed mud environmental protection dredging depth, comprising analyzing and evaluating the releasing risk and ecological hazard risk of the pollutant at different layer side of the mud based on the vertical distribution of the pollutant in the bed mud by researching the relation of the releasing of bed mud pollutant nitrogen, phosphor or the like and the corresponding pollutant content and the ecological hazard evaluation corresponding with the content of the bed mud pollutant containing heavy metal; and determining the bed mud dredging depth based on the divided corresponding risk grade. After dredging, the anticipated release rate of the key pollutant such as nitrogen, phosphor at the new surface layer of bed mud-hydrosphere achieves or exceeds a release intensity threshold and the latent ecological hazard index of the heavy metal at the new surface layer of bed mud achieves or exceeds a hazard threshold, therefore the basis of the dredging depth is determined.

Description

technical field [0001] The invention relates to the determination of parameters used in dredging engineering for bottom mud in polluted water bodies, in particular to a method for determining the environmental protection dredging depth of bottom mud in polluted water bodies for the purpose of lake water quality improvement and ecological protection. Background technique [0002] Environmental protection dredging is an environmental engineering operation that improves the water environment by removing polluting sediment and controlling internal pollution sources. Due to relatively high capital investment and large human intervention in the environment, whether the input is reasonable and correct, and whether the environmental output is Satisfaction is often the primary consideration of decision makers. When the scope of dredging is determined, the most important construction parameter affecting capital investment and environmental output is the dredging depth. [0003] In th...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned defects, and establish a method for determining the environmental protection dredging depth of the bottom mud of polluted water bodies combining the bottom mud release risk and the ecological hazard risk assessment, so as to solve the problem that cannot be determined scientifically and effectively in the formulation of the environmental protection dredging plan Focus issues of sediment dredging depth

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