A method for discriminating pollution types of heavy metal contaminated sediment in environmental protection dredging engineering

Abstract

The invention relates to a method for judging the pollution type of heavy metal polluted sediment in environmental protection dredging engineering. The main technical schemes are as follows: the sample bank of heavy metal content in surface sediment samples and the sample bank of heavy metal content in core sediment samples are established; The baseline values of heavy metal contents in surface sediment samples and in core sediment samples are calculated according to the data from the sample bank; According to the baseline values, the non-point source pollution status of heavy metals in surface sediment and the point source pollution status of heavy metals in surface sediment are judged; the relative proportion of point source pollution to non-point source pollution is calculated, and theheavy metal pollution type of sediment is judged. The method solves the technical problems that the existing risk assessment methods of heavy metal pollution in sediments are unable to reflect the pollution types of heavy metals in sediments, and is helpful to determine and further formulate targeted countermeasures to avoid the problems of over-protection and under-protection.

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...

AI Technical Summary

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

Images