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Soil flushing repair system and method

A remediation system and soil leaching technology, applied in the field of contaminated soil remediation, can solve the problems of secondary pollution leaching, cement cake removal, storage, screen blockage, etc.

Active Publication Date: 2017-09-05
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the screen mesh is prone to clogging due to uneven feed particle size, and to solve the secondary pollution of polluted soil pretreatment pollutants and the storage of leached and decemented cakes. , Subsequent drying problems, thus providing a system and method for soil rinsing and repairing

Method used

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  • Soil flushing repair system and method
  • Soil flushing repair system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0082] This embodiment provides a kind of soil rinsing restoration process system, such as figure 1As shown, the soil washing repair system includes the following modules in order:

[0083] Crushing and screening module, the sieve of the crushing and screening module has an aperture of 30mm-60mm, which is used to pretreat the contaminated soil into materials with a particle size of <60mm, so as to ensure the matching between the particle size of the feed contaminated soil and the system ;

[0084] Feed slurry making module is used for pulp making of feed contaminated soil, which is convenient for subsequent leaching and reduction of contaminated soil;

[0085] The leaching particle size module is used to leaching and reclaiming clean soil with different particle sizes so as to reduce the amount of pollution remediation works;

[0086] The water treatment module is used to purify the washing water as the circulating water in the system and separate the muddy water;

[0087] ...

Embodiment 2

[0134] The specific steps of repairing polluted soil by the soil rinsing and repairing process system of the present invention are as follows:

[0135] 1. Crushing and screening

[0136] Transport the excavated polluted soil to the feeding workshop, and use the crushing and screening machine to crush and screen in sequence, and crush and screen the polluted soil containing two particle sizes of ≥50mm and <50mm. The rinsing system is used to treat polluted soil with a particle size less than 50mm;

[0137] 2. Feed pulp making

[0138] The crushed and screened <50mm particle size polluted soil is fed to the chain conveyor, and the chain conveyor feeds the contaminated soil to the belt conveyor I. When the polluted soil goes to the high-level electromagnetic iron remover, the miscellaneous iron in the polluted soil is removed to the temporary storage area I of the miscellaneous iron. At the feed port of the rod mill drum desilter, the feed ratio of the rinsing water and the pol...

Embodiment 3

[0150] The soil leaching restoration system of the present invention has been successfully applied to a restoration project of a steel polluted site in South China as follows:

[0151] The soil remediation volume of the project is 517591m 3 , including heavy metal pollutants such as Pb, Cd, and Zn; the feed material for leaching is polluted soil with a particle size of <50mm after crushing and screening pretreatment, and the granular materials are classified into 25-50mm, 5-25mm, and 2-5mm after leaching , 1-2mm, 0.2-1mm, 0.075-0.2mm and <0.075mm, a total of 7 kinds of pellets. Among them, 25-50mm, 5-25mm, 2-5mm, 1-2mm, 0.2-1mm and 0.075-0.2mm, a total of 6 kinds of pellets are recyclable pellets. After soil sampling and testing, all the recyclable pellets after leaching meet the standard , can be recycled directly, and the degree of reduction is 75%-85%. The relevant data on the concentration of heavy metal pollutants before and after leaching treatment are shown in the tab...

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Abstract

The invention discloses a soil flushing repair system and method, and belongs to the technical field of soil repair. The soil flushing repair system sequentially comprises a crushing and screening module, a feeding and mud making module, a flushing and particle size distributing module, a water treatment module, a mud dehydration module, a water supply module and a central control room module. The crushing and screening module including a sieve with the hole diameter of a screen cloth being 30mm-60mm is arranged in front of the operating process of the feeding and mud making module. The flushing and particle size distributing module can achieve level-7 wet sieving and flushing of contaminated soil by means of water jet cutting of a high-pressure spraying system and mechanical vibration of a vibration motor, and discharging cleanliness and recoverability can be guaranteed. The mud dehydration module is provided with a drying workshop and used for preventing rainwater from wetting dehydration mud cakes, guaranteeing subsequent drying of the mud cakes and controlling secondary pollution of pollutants in the mud cakes. By the adoption of the soil flushing repair system and method, the problem that the screen cloth can be blocked easily due to the uneven feeding grain size in the prior art is solved, and the problems of flushing dehydration mud cake storage, subsequent drying and secondary pollution of the pollutants are also solved.

Description

technical field [0001] The invention belongs to the technical field of contaminated soil remediation, and relates to a leaching and remediation system and method for polluted soil with a high content of coarse particles. Background technique [0002] In recent years, with the advancement of my country's industrial structure adjustment and urban land use structure adjustment, some chemical, steel, machinery and other industrial enterprises occupying superior positions in urban areas have been relocated, relocated and reconstructed. However, the heavy metals, volatile and semi-volatile organic pollutants left behind by the relocation of enterprises have become environmental hazards in the development and utilization of urban land. Therefore, the safety of urban human settlements is worrying. Carry out risk assessment and soil restoration Governance is the top priority right now. [0003] Soil leaching and remediation technology is based on the adsorption characteristics of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02
CPCB09C1/02
Inventor 李书鹏顾群崔双超杨乐巍刘鹏闫利刚丁浩然谢方文张岳田德金贺乾嘉李静文
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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