Device and method using bidirectional ferry type combined technology to remedy soil polluted by PCBs (polychlorinated biphenyls)
A technology of contaminated soil and combined technology, which is applied in the field of devices for remediating soil contaminated by PCBs, can solve the problems of processing capacity, poor treatment effect, limited remediation effect, and reduced remediation efficiency, so as to improve remediation efficiency and save time and cost. , No secondary pollution effect
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Embodiment 1
[0036] In the experiment, 500g of old soil artificially doped with a concentration of 100mg / kg hexachlorobiphenyl (HCB) was stacked in 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 aci...
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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