Leaching treatment method and system for heavy metal pollution bottom sediment in ephemeral stream

Abstract

The invention discloses a leaching treatment method and system for heavy metal pollution bottom sediment in an ephemeral stream. The method includes the following steps that 1, the bottom sediment is broken apart; 2, leaching is performed with clean water through a cylinder stone-washing machine; 3, bottom sediment components with the particle size being 2.36 mm or below are subjected to sand-washing treatment; 4, bottom sediment components with the particle size being 1.18 mm or below enter a precipitation pool and are lifted to a vibrating sieve to sieve fine sand with the particle size being 0.075-1.18 mm; 5, bottom sediment components with the particle size being 0.075 mm enter a sedimentation pool, and sludge after sedimentation and separation is treated; 6, the bottom sediment in the precipitation pool and the sedimentation pool is treated and then discharged after meeting discharging standards. A stone-washing system, a sand-washing system, the vibrating sieve, a water supply pipeline and a chemical dissolving device are involved in the method, and the stone-washing system, the sand-washing system and the vibrating sieve are connected with the water supply pipeline and the chemical dissolving device. The method is easy to operate and convenient to implement, solves the problems that big and small particulate matter of the bottom sediment adhere to one another, and sticky blocks are large in quantity, and improves the sieving efficiency of the bottom sediment.

Description

technical field [0001] The invention relates to a leaching treatment method and a system for treating and repairing sediment polluted by heavy metals, and belongs to the technical field of sediment pollution treatment and repair. Background technique [0002] At present, different countries in the world have different plans and technical solutions for the treatment of heavy metal pollution in sediments. Especially in my country, due to factors such as pollution and economic regions, the conditions for comprehensive treatment of heavy metal pollution in sediments are not yet available. According to the degree of pollution of the polluted water body and the implementation conditions of the polluted site, the commonly used restoration technologies for heavy metal-contaminated sediment are mainly divided into in-situ treatment technology and ex-situ treatment technology. [0003] In situ treatment technologies mainly include in situ phytoremediation and in situ material covering...

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Problems solved by technology

Although this method considers the characteristics of low water content and high sand and gravel content in the dredged sediment of seasonal river engineering, a drum stone washing machine and a spiral sand washing machine are set up, but the specific structure and application are not clearly described. When the content of pebbles (particle size>4.75mm) contained in it is large (mass fraction greater than 10%), it is transported to the drum stone washing machine by a closed sediment transport vehicle, and the sediment is washed by river water and chemical leaching. leaching treatment, but the structure, function and operation method of the drum stone washing machine and the spiral sand washing machine have not been designed. When required, chemical leaching is directly used, which increases the economic burden of eluent treatment and also increases the possibility of eluent polluting adjacent river water

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