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Contaminated soil repair system and method

A technology for polluting soil and repairing the system, applied in the field of environmental protection, can solve the problems of restricting the application of mechanical ball milling, high noise, etc., and achieve the effect of avoiding long and complicated process, no secondary pollution, and avoiding dioxins

Inactive Publication Date: 2017-06-09
SINOPEC ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical ball milling method also has its disadvantages. Before the ball milling, the soil must be dried to remove water, and the noise of the ball milling process is too loud, which limits the application of the mechanical ball milling technology.

Method used

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  • Contaminated soil repair system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In a site polluted by heavy metal arsenic, the average concentration of arsenic in the contaminated soil was 122 mg / kg. After air-drying and sieving, polluted soil with a particle size of <5mm is obtained, which is sent to a low-temperature rotary kiln by a screw conveyor, dried at 105°C for 60 minutes, and then enters the drum of a ball mill. Control the soil feeding speed to keep the ball-to-soil mass ratio between 6:1 and 3:1, the rotating speed of the ball mill drum is 15r / min, and the soil ball milling time is 60min. Analyze the treated soil samples according to US EPA SW 846 Method The 1312 method carried out the leaching test on the soil before and after the ball milling treatment, and analyzed the concentration of arsenic in the leachate by ICP-OES. The arsenic concentrations in the leachate before and after the ball milling treatment were measured to be 3.3mg / L and 0.03mg / L respectively, which reached the groundwater quality standard (GB / T 14848-93) Class III ...

Embodiment 2

[0060] In a site polluted by heavy metal lead, the average concentration of lead in the polluted soil was 1120mg / kg. After air-drying and sieving, polluted soil with a particle size of <5mm is obtained, which is sent to a low-temperature rotary furnace through a screw conveyor, dried at 110°C for 30 minutes, and then enters the drum of a ball mill. Control the speed of soil entry so that the mass ratio of balls to soil is kept at 10:1~1:1, the rotating speed of the ball mill drum is 10~15r / min, and the soil ball milling time is 30min. The treated soil samples are analyzed according to US EPA SW The 846 Method 1312 method carried out the leaching test on the soil before and after the ball milling treatment. The lead concentration in the leachate was analyzed by ICP-OES, and the lead concentration in the leachate before and after the ball milling treatment was measured to be 42mg / L and 0.01mg / L respectively, which reached the groundwater quality standard (GB / T 14848-93) Class I...

Embodiment 3

[0062] In a PCBs (polychlorinated biphenyls) contaminated site, the total concentration of PCBs congeners in the contaminated soil was 830mg / kg. After air-drying and screening, the contaminated soil with a particle size of <2mm is mixed with a certain amount of additives, and then sent to a low-temperature rotary furnace through a screw conveyor, dried at 80°C for 5 hours, and then entered into the drum of a ball mill. Control the speed of soil entry so that the mass ratio of balls to soil is kept at 6:1-3:1, the rotating speed of the ball mill drum is 20-40r / min, and the soil ball milling time is 5h min. The treated soil is sampled and extracted with dichloromethane ultrasonically. Afterwards, the extract was purified according to the US EPA 1668A standard method, and finally quantitatively analyzed by GC-MS. It was measured that the concentration of PCBs in the soil after ball milling treatment was 9.1 mg / kg, and the removal rate of PCBs reached 98.9%.

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Abstract

The invention provides a contaminated soil repair system. The contaminated soil repair system comprises a drying part and a ball grinding mill. The drying part comprises a rotary kiln 8 and a combustion chamber 7. The combustion chamber 7 is arranged on the front section, close to a feeding device 2, of the rotary kiln 8 in a sleeving mode. A discharging device 10 is arranged on the tail portion of the rotary kiln 8. The discharging device 10 is connected with a feeding inlet 12 of the ball grinding mill. The invention further provides a contaminated soil repair method. The method includes the steps that pretreated contaminated soil is conveyed into the rotary kiln 8, and ball milling is performed after drying water removal is completed; preferably, the heating temperature is 80-110 DEG C; more preferably, drying time of the contaminated soil in the rotary kiln 8 is 0.2-5h; and ball-milling time of the contaminated soil is also 0.2-5h.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a polluted soil remediation system and a polluted soil remediation method. Background technique [0002] The rapid development of industry has highlighted the problem of environmental pollution, especially the pollution of soil and groundwater caused by unreasonable disposal of hazardous waste. Soil pollution has the characteristics of concealment and irreversibility, which will directly or indirectly endanger human health and cause other environmental problems. At present, pollutants can be generally divided into four categories according to their properties: organic pollutants, heavy metals, radioactive elements and pathogenic microorganisms, among which organic pollutants and heavy metal pollution and their combined pollution sites are the most common. [0003] Generally speaking, for different pollutants, remediation techniques are also different. For organic contami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B01D53/04
CPCB01D53/04B09C1/065B01D2253/102
Inventor 李磊李怿王龙延白正伟王乾杨雪梅吕大伟
Owner SINOPEC ENG GRP CO LTD
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