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Method for renovating polycyclic aromatic hydrocarbon contaminated soil with ultrasound wave

A polycyclic aromatic hydrocarbon and polluted soil technology, applied in the restoration of polluted soil and other directions, can solve the problems of long treatment period and secondary pollution, and achieve the effects of fast removal rate, no secondary pollution and high mineralization rate.

Inactive Publication Date: 2008-06-11
NANJING UNIV OF INFORMATION SCI & TECH
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  • Description
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the shortcomings of secondary pollution and long treatment period in the existing soil remediation technology, the present invention provides a green and efficient method for ultrasonic remediation of PAH-contaminated soil without secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The organic matter content of the tested soil was 17.87g / kg; Fe 2 o 3 , MnO 2 、TiO 2 The content of 16 kinds of polycyclic aromatic hydrocarbons stipulated by EPA in the soil before restoration is 55.15g / kg, 1.34g / kg, 15.21g / kg respectively; the concentration of 16 polycyclic aromatic hydrocarbons in the soil before remediation is 299.84μg / kg; the soil humidity is 65%; the ultrasonic frequency is 20kHz; Ultrasonic output power is 400W; ultrasonic irradiation time is 30min; ultrasonic emission adopts trough equipment. The content of polycyclic aromatic hydrocarbons in the soil after remediation was 68.78μg / kg, and the removal rate was 77.1%.

Embodiment 2

[0017] Substantially the same as Example 1, but the soil organic matter content used is 11.24g / kg, Fe 2 o 3 , MnO 2 、TiO 2 The contents are 49.62g / kg, 0.95g / kg, 9.36g / kg respectively. Before remediation, the concentration of 16 kinds of polycyclic aromatic hydrocarbons stipulated by EPA in the soil was 228.19 μg / kg, and after remediation, the content of polycyclic aromatic hydrocarbons in the soil was 35.85 μg / kg, and the removal rate was 84.3%.

Embodiment 3

[0019] Substantially the same as Example 1, but the soil organic matter content used is 17.25g / kg, Fe 2 o 3 , MnO 2 、TiO 2 The contents of 39.54g / kg, 0.93g / kg, 9.15g / kg respectively. Before remediation, the concentration of 16 polycyclic aromatic hydrocarbons stipulated by EPA in the soil was 37 3.56 μg / kg, and after remediation, the content of polycyclic aromatic hydrocarbons in the soil was 107.22 μg / kg, and the removal rate was 71.3%.

[0020] It can be seen from Examples 1, 2, and 3 that the contents of 16 kinds of polycyclic aromatic hydrocarbons contained in the soils with different components are different, and the components of the soil are different, resulting in different removal effects of polycyclic aromatic hydrocarbons. The removal of polycyclic aromatic hydrocarbons in the soil is related to the ultrasonic cavitation effect. When the content of water-soluble polycyclic aromatic hydrocarbons in the soil is relatively large, the removal effect is relatively goo...

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Abstract

The invention belongs to the surgical repair field of contaminating soil, and discloses a method for restoring soil which is polluted by polycyclic aromatic through supersonic waves. Soil slurry with a dampness 5%-95%, which is polluted by the polycyclic aromatic whose concentration of the polycyclic aromatic is 10-10000 g / kg is treated under a condition of supersonic wave irradiations, supersonic frequency is 20kHz-100kHz, the output power of the supersonic waves is 100W-2.0kw, and the duration of the supersonic wave irradiations is 5min-4h. The polycyclic aromatic is one of 16 polycyclic aromatics compounds with priority control, and the 16 polycyclic aromatics compounds are regulated in American EPA610. The invention mainly adopts cavitations effects of the supersonic waves to degrade or subtract organic contaminants with durability as the polycyclic aromatic and the like. Compared with a soil restoring technique which is adopted commonly at present, and the method isn't affected by the condition of contaminant species and environment, and the method has a wide applying field. The invention has high efficiency, low energy consumption, non-secondary pollutions, good social profits and environmental benefits.

Description

technical field [0001] The invention relates to a restoration method for polluted soil, in particular to the restoration of soil polluted by polycyclic aromatic hydrocarbons. Background technique [0002] PAHs are common persistent organic pollutants in soil. Polycyclic aromatic hydrocarbons have strong "three-cause" and immunotoxicity. Polycyclic aromatic hydrocarbons in soil enter the human body through the food chain, which can lead to a sharp increase in the incidence of lung cancer, skin cancer, and scrotal cancer. Therefore, polycyclic aromatic hydrocarbons in soil The control and remediation of aromatic hydrocarbons and other persistent organic pollutants has become an important research content in the field of environmental science and technology at home and abroad. [0003] At present, domestic and foreign research on the remediation of PAH-contaminated soils mainly focuses on reagent leaching remediation, chemical oxidation remediation, electrodynamic remediation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06
Inventor 郭照冰何都良郑有飞唐登勇李久海马建军付晓茹方华李俊冯若
Owner NANJING UNIV OF INFORMATION SCI & TECH
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