Method for treating bottom mud polluted by heavy metals based on particle size distribution

Abstract

The invention provides a method for treating bottom mud polluted by heavy metals based on particle size distribution. The method comprises the following steps of (1), sieving the bottom mud polluted by the heavy metals so as to obtain pebble, coarse sand, medium sand, fine sand and mud components; (2), setting judgment conditions according to different requirements on heavy metal contents and heavy metal concentration of leachate in the mud treatment standard and solid waste and hazardous waste treatment standard of a municipal sewage treatment plant; (3), performing heavy metal content detection analysis on the mud components with various particle sizes, and sequentially judging and treating. According to the reduction, hazard-free treatment and recycling treatment principle, the particle size distribution characteristics of bottom mud and the local socio-economical level and treatment way conditions of a project are fully combined, and measures are adjusted to local conditions, main treatment modes are modular and programmable, so that reference and operation are convenient; the method is simple to operate and convenient to implement, can be used for solving the systematic situation of an existing method for treating the bottom mud polluted by the heavy metals, and has relatively high pertinence and flexibility.

Description

technical field [0001] The invention relates to a method for final disposal of heavy metal-contaminated bottom mud in natural water such as rivers, lakes, river estuaries and tidal flats, and belongs to the technical field of treatment and restoration of polluted bottom mud. Background technique [0002] Sediment usually refers to the mixture of clay, silt, organic matter and various minerals, which is formed by depositing at the bottom of the water body after long-term physical, chemical and biological actions and water body transportation. Sediment can reflect the historical process of water body evolution, and is an important part of natural water ecosystems such as rivers, lakes, and tidal flats at river estuaries. [0003] Sediment pollution can be divided into organic pollution and inorganic pollution, and inorganic pollution can be divided into nitrogen, phosphorus and other eutrophic substances pollution and heavy metal pollution. Organic matter, nitrogen, phosphoru...

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Problems solved by technology

[0012] The present invention aims at the lack of heavy metal-contaminated sediment disposal methods, and according to the current urban sewage treatment plant sludge disposal standards, solid waste and hazardous waste disposal standards for different requirements of heavy metal content and heavy metal concentration in the leachate, combined with the particle size of the sediment According to the distribution characteristics, the social and economic level of the project location and the conditions of disposal routes, set reasonable judgment conditions and judgment order, and finally provide a kind of heavy metal particle size distribution based on simple operation, easy implementation, strong pertinence and flexibility. Disposal method of polluted sediment

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