A method for discriminating pollution types of heavy metal-polluted sediments in environmental protection dredging projects

Abstract

The invention relates to a method for discriminating pollution types of heavy metal-polluted sediment in an environmental protection dredging project. The main technical schemes adopted are: establish a sample library of heavy metal content in surface sediment samples and a sample library of heavy metal content in columnar sediment samples; calculate the baseline value of heavy metal content in surface sediment samples according to the data in the sample library, and calculate the The baseline value of heavy metal content; according to the above baseline value, the status of heavy metal non-point source pollution in surface sediments can be judged, and the status of heavy metal point source pollution in surface sediments can be judged; the relative proportion of heavy metal point source pollution and non-point source pollution can be calculated, and heavy metal pollution in sediments can be judged type. This method solves the technical problem that the existing heavy metal pollution risk assessment methods in sediments are not enough to reflect the type of heavy metal pollution in sediments, and helps to determine and formulate targeted countermeasures to avoid "over-protection" and "over-protection". underprotection” issue.

Description

technical field [0001] The invention relates to the field of bottom mud ecological restoration, in particular to a method for discriminating pollution types of heavy metal-polluted bottom mud in environmental protection dredging projects. Background technique [0002] Heavy metals are cumulative, refractory, persistent and toxic, and pose great harm to the ecological environment and organisms. Water body sediments are a reservoir of man-made and natural weathering substances in the watershed, which can directly affect benthic organisms. The heavy metals and other pollutants enriched in sediments can be re-released through reactivation under suitable environmental conditions. When it enters the water body, it will produce "secondary pollution", which will have a negative impact on the water ecosystem and lead to ecological disasters. Therefore, it is necessary to effectively control the sediment. [0003] Before taking pollution control measures for heavy metal-polluted sed...

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Problems solved by technology

[0004] However, the inventor found in the process of invention that there are certain defects in the prior art: when using the above-mentioned judgment method to judge the pollution type of the sediment, it is necessary to pass the measured certain heavy metal content and quality standard, background value or reference value. Compared with the ratio, the excessive multiple of heavy metals in the sediment or the ecological risk can be determined. However, there is no unified evaluation standard for judging the pollution degree of heavy metals in the existing methods, and it is difficult to obtain the background value of heavy metals in the sediments, only whether the sediments exist The information on heavy metal pollution cannot accurately identify the type of heavy metal pollution, and thus cannot provide accurate and beneficial information for the specific deployment of sediment dredging projects in the later stage

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