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A method for remediating pcbs-contaminated soil using two-way ferry combined technology

A combined technology, a technology for contaminated soil, applied in the field of devices for repairing PCBs-contaminated soil, can solve the problems of processing capacity, poor treatment effect, limited repair effect, and reduced repair efficiency, so as to improve repair efficiency, save time and cost , No secondary pollution effect

Active Publication Date: 2018-08-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned pollution treatment methods have their own advantages and disadvantages, but in general, compared with the joint technology, only relying on a single technology to remediate PCB-contaminated soil has poor treatment capacity and treatment effect and has relatively large limitations
At the same time, after adopting a specific repair method, the adaptability is poor, and it cannot cope with new situations such as re-pollution, resulting in large investment, limited repair effect, and reduced repair efficiency.

Method used

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  • A method for remediating pcbs-contaminated soil using two-way ferry combined technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In the experiment, 500g of old soil artificially doped with a concentration of 100mg / kg hexachlorobiphenyl (HCB) was stacked into the device as an experimental sample. The size of the device was 25cm×20cm×12cm, and the electrodes were made of graphite electrodes. According to attached figure 1 Device Installation Instructions Arrange the required equipment and operate the equipment according to the above method steps. Wherein in step (B), the applied voltage gradient is 2v / cm, and the pressure time is 36h; the spray speed is 7mL / min, and stops after spraying for 18h; the ultrasonic frequency in the ultrasonic system is 300kHz, and the irradiation time is 18h . In step (C), the applied voltage gradient is 2v / cm, the pressure application time is 18h, the spraying speed is 7mL / min, and the spraying stops after 9h; the ultrasonic frequency in the ultrasonic system is 100kHz, and the irradiation time is 9h. Choose 0.05mol / L NaOH as the anolyte, configure 0.05mol / L citric a...

Embodiment 2

[0038] Repeat embodiment 1, other conditions are constant, increase the PRB reaction wall between the first arc electrode chamber 6 and the straight electrode chamber 7 and between the straight electrode chamber 7 and the second arc electrode chamber 8, the results show , as the number of PRB reaction walls increased, the removal rate of PCBs in soil also increased.

Embodiment 3

[0040] Repeat Example 1, other conditions are constant, just in step (B), applied voltage gradient is 1.5v / cm, and pressure application time is 24h; Spray rate is 5mL / min, stops after spraying 12h; Ultrasonic system The ultrasonic frequency is 200kHz, and the irradiation time is 12h. In step (C), the applied voltage gradient is 2.5v / cm, the pressure application time is 24h, the spray speed is 5mL / min, and stops after 12h of spraying; the ultrasonic frequency in the ultrasonic system is 20kHz, and the irradiation time is 6h .

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Abstract

The invention discloses a device and method using the bidirectional ferry type combined technology to remedy soil polluted by PCBs (polychlorinated biphenyls).The device is sealed during the whole remedying process and mainly comprises an electric actuator, a PRB reaction wall absorption device, a surfactant adding device and an ultrasonic device.Three electrodes are sequentially evenly mounted in the direction parallel with the horizontal plane of soil in a polluted area from top to bottom, the upper electrode and the lower electrodes are arc-shaped electrodes, the middle electrode is a straight electrode, PRB reaction walls and an ultrasonic probe are mounted between every two adjacent electrodes, and spraying devices are mounted on the surface layer of the soil.The device has the advantages that the bidirectional ferry type combined technology is used to treat PCBs pollutants, and pollutants can be effectively removed by using the conversion electrodes and combining the surfactant solubilizing technology, the ultrasonic cavitation technology and the PRB absorption interception technology; the whole treatment process is clean and free of secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to a device and method for repairing soil contaminated by PCBs. Background technique [0002] Polychlorinated biphenyls (PCBs) are a group of chlorinated hydrocarbons with a total of 209 congeners. PCBs are artificially synthesized compounds, so improper management of PCBs production and use will lead to environmental pollution, such as industrial wastewater containing PCBs, random discharge of waste residues; leakage of sealed storage places for PCBs or stacking of filtrate discharged in garbage dumps; Substances containing PCBs are released into the atmosphere if the temperature does not reach the standard during the incineration process; PCBs in plasticizers volatilize, etc. In my country, the overall pollution level of PCBs is relatively low, but due to people's weak environmental protection awareness and illegal operations, some areas have caused relatively se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/02B09C1/00
CPCB09C1/00B09C1/02B09C1/085B09C2101/00
Inventor 卢宏玮任丽霞何理陈义忠李晶
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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