Leaching remediation device for heavy metal and organic matter combined contaminated soil
A technology of complex pollution and organic matter, applied in the field of environmental engineering, can solve the problems of increasing repair costs, destroying the physical and chemical properties of soil, and complex equipment design, and achieves the effects of low environmental secondary pollution risk, obvious treatment effect, and easy access
Pending Publication Date: 2021-04-02
CSSC NANJING LUZHOU ENVIRONMENT PROTECTION CO LTD
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Problems solved by technology
The disadvantage of chemical leaching technology is that it may introduce secondary pollution and increase the risk of soil safety. At the same time, the collection and treatment of leaching waste liquid will also increase the restoration cost
[0005] Most of the existing leaching equipment can only deal with a single pollutant and cannot recycle the leaching agent. These devices have their shortcomings: (1) Contaminated soil needs to be crushed, screened, mixed, etc. Treatment process, Physicochemical properties of heavily damaged soil
(2) The equipment design is complicated, the cost and energy consumption are too high, and the practicability is not strong
(3) The removal effect of pollutants is not good, and the leaching waste generated will cause secondary pollution to the environment
Method used
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Embodiment 1
[0040] Such as figure 1 As shown, a leaching repair device for heavy metal and organic compound polluted soil is composed of a three-stage series screening system and an advanced sewage treatment system. The primary screening system includes a soil feeding hopper 1, a quantitative feeder 2, The primary crushing, screening and quantitative control of soil can be realized; the secondary screening system includes multi-layer vibrating screen 4, drum stone washing machine 7, spiral sand washing machine 10 and discharge belt conveyor, which can realize secondary screening of soil , to meet the reduction requirements; the three-stage screening system includes sedimentation reuse water tank 5, linear dehydration screen 14, rinsing and stirring device 15 and dosing device, which can realize three-stage fine screening of soil and precise dosing; advanced sewage treatment The system includes a regulating tank unit, a Fenton reaction unit, a coagulation-air flotation unit, an intermediat...
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The invention relates to a leaching remediation device for heavy metal and organic matter combined contaminated soil. The device is composed of three-stage series screening systems and a deep sewage treatment system, the first-stage screening system comprises a soil feed hopper and a constant feeder, the second-stage screening system comprises a multilayer vibrating screen, a roller stone washer,a spiral sand washer and a discharge belt conveyor, and the third-stage screening system comprises a precipitation recycling water tank, a linear dewatering screen, a leaching stirring device and a dosing device. A leaching system, a leaching waste liquid treatment system and a control system are organically combined together, parameters such as leacheate selection, stirring time, stirring strength, water-soil ratio and soil particle size in the leaching process can be adjusted, and optimization of a leaching scheme is facilitated. The remediation device is suitable for chemical leaching treatment of heavy metal and organic matter combined polluted soil to form a set of complete closed-loop in-situ ex-situ / ex-situ leaching remediation device, and the device can be used for rapid and effective remediation of high-concentration polluted soil and waste. Meanwhile, the device is low in secondary pollution risk of the environment, realizes zero emission, and is energy-saving, efficient andsafe.
Description
technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a leaching repair device for heavy metal and organic compound polluted soil, which realizes the integration of soil leaching and leachate treatment and recycling, and can be widely used in soil restoration projects in polluted plots . Background technique [0002] At present, domestic soil pollution can be divided into three categories: cultivated land pollution, industrial site pollution and mine pollution. With the acceleration of industrialization and urbanization, and the implementation of the city's "retreat from two to three" strategy, the relocated enterprises mainly include chemical, iron and steel, nonferrous metallurgy, machinery manufacturing, light industry and other industries. The soil and groundwater environment of these enterprises are seriously affected by the pollution of industrial activities and "three wastes". After the risk ass...
Claims
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IPC IPC(8): B09C1/08B09C1/02
CPCB09C1/08B09C1/02B09C2101/00
Inventor 初亚飞章利伟郭喜平周永贤
Owner CSSC NANJING LUZHOU ENVIRONMENT PROTECTION CO LTD