A multi-objective environmental protection dredging method for complex pollutants based on 4r theory

Abstract

The invention discloses a composite polluted bottom sludge multi-target environment-friendly dredging method based on a 4R theory. As for bottom sludge with complex pollution sources and diverse pollutants in rivers and lakes, release of the pollutants in the bottom sludge before and after dredging, ecological risk of the harmful pollutants, resuspension of the bottom sludge and the pollutants in the dredging process, and dredging residuals are comprehensively evaluated, the precise dredging depth, the dredging range and the dredging mode for comprehensive control over multiple pollution targets are proposed, the control effect of environment-friendly dredging on bottom sludge internal source pollution can be significantly improved, the number of times of repeated dredging is decreased, and the environmental and economic benefits of environment-friendly dredging are increased.

Description

technical field [0001] The invention belongs to the field of environmental protection and relates to a multi-objective environmental protection dredging method for compound polluted bottom mud based on 4R theory. Background technique [0002] Sediment environmental protection dredging technology has been widely used in the treatment of rivers, lakes and other water bodies since the 1960s. Because it can quickly and directly remove various pollutants enriched in the sediment, it is widely used in the world. It has been applied in the treatment of many polluted rivers, lakes and other water bodies in China. However, the pollution control effect of sediment dredging has been subject to many controversies because the effect of sediment dredging is disturbed by various factors: [0003] First, the understanding of the complex pollution state of the sediment is not comprehensive enough, and the ecological risk (Risk) evaluation of pollutants is not enough. Since the sediment has...

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Problems solved by technology

[0005] The third is the release of pollutants at the new mud-water interface after dredging. The reasons for the release of pollutants after dredging are, on the one hand, unreasonable judgments on the pollution of compound polluted sediment and the depth of dredging, and on the other hand, the dredging quality cannot meet the requirements

However, the existing sediment dredging technology pays more attention to the improvement, research and development and operation of dredging equipment (CN2016100747678, CN 207452977 U, CN 207211233 U, CN 104005441 B, etc.) or the disposal of dredged silt (CN 106082903 B, CN 102229485 B, etc. ), some technologies have considered the dredging method of pollutants such as heavy metals and nutrient salts in the sediment (CN 101962961 B). Systematic evaluation and analysis of mud resuspension (Resuspension), pollutant release (Release), pollution residue (Residual), and ecological risk (Risk), resulting in unsatisfactory control effect of environmental protection dredging on endogenous pollution of sediment and has been questioned by many

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