Method for degrading solid phase adsorbed state petroleum hydrocarbon in petroleum contaminated soil

A solid-phase adsorption and polluted soil technology, applied in the field of environmental engineering, can solve the problem of low oxidation rate of adsorbed petroleum hydrocarbons, and achieve the effects of reducing self-decomposition consumption, less heat production, and high utilization rate

Active Publication Date: 2013-01-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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Problems solved by technology

Although these existing methods can improve the oxidation effect of adsorbed petroleum hydrocarbons to a certain extent, in these methods, hydroxyl radicals are generated in the water phase, while adsorbed petroleum hydrocarbons exist in the solid phase, so it is difficult to break through the water phase and transmit hydroxyl radicals to The technical bottleneck is the exhaustion of hydroxyl radicals before the adsorption of petroleum hydrocarbons or before the adsorption of petroleum hydrocarbons into the water phase. The oxidation rate of adsorbed petroleum hydrocarbons is low. It is of great practical significance to develop effective methods for removing soil adsorbed petroleum hydrocarbons.

Method used

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  • Method for degrading solid phase adsorbed state petroleum hydrocarbon in petroleum contaminated soil
  • Method for degrading solid phase adsorbed state petroleum hydrocarbon in petroleum contaminated soil
  • Method for degrading solid phase adsorbed state petroleum hydrocarbon in petroleum contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The oil-contaminated soil in this example was taken from the vicinity of an oil storage tank in Amsterdam, the Netherlands. After the oil-contaminated soil was passed through a 2mm sieve to remove impurities, it was put into a rotating drum with a rotation speed of 12.5rpm and mixed for 48 hours. After mixing evenly, a contaminated soil sample was obtained. Store in refrigerator at 4°C until use. Table 1 shows the pollution of petroleum-contaminated soil. It can be seen from the table that 95% of the petroleum hydrocarbons are present in the solid phase. long C 12 -C 20 Adsorbed hydrocarbons account for 62%, and only 5% of petroleum hydrocarbons exist in the water phase.

[0028] Table 1 Contamination of oil-contaminated soil

[0029]

[0030] Because the total concentration of solid-phase adsorbed petroleum hydrocarbons accounts for 95% of the total petroleum hydrocarbons concentration in the above-mentioned polluted soil samples, it occupies an absolute dominant...

Embodiment 2

[0046] The petroleum-contaminated soil samples in this example were taken near a gas station in Tianjiawan, Xi'an, and the soil sample pretreatment method was the same as in Example 1. After passing through a 2mm sieve to remove impurities, put it in a drum with a rotating speed of 12.5rpm and mix for 48 hours. After mixing evenly, the contaminated soil sample was obtained, and stored in a refrigerator at 4°C until use. The total concentration of solid-phase adsorbed petroleum hydrocarbons in the contaminated soil sample is as high as 5040 mg / kg, accounting for 93% of the total concentration of petroleum hydrocarbons, of which the carbon chain length C 10 -C 12 、C 13 -C 16 、C 17 -C 20 、C 21 -C 24 、C 25 -C 40 The concentrations of adsorbed hydrocarbons were 940, 1680, 1610, 580, and 230 mg / kg, respectively.

[0047] Because the total concentration of solid-phase adsorbed petroleum hydrocarbons accounts for 93% of the total petroleum hydrocarbons concentration in the ab...

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Abstract

The invention aims to provide a method for degrading solid phase adsorbed state petroleum hydrocarbon in petroleum contaminated soil. According to the method, the preparation concentration of a Fenton reagent is determined by detecting the concentration of petroleum hydrocarbon in the petroleum contaminated soil, different amounts of hydrogen peroxide in the Fenton reagent are fed for multiple times, and the concentration and the dosage of hydrogen peroxide at the next time are adjusted by the concentration of petroleum hydrocarbon after every addition for a certain time, wherein the concentration of hydrogen peroxide is 150mmol/L to 350mmol/L, and the feeding time of H2O2 is 3 to 6 times. According to the invention, a solid phase prepared iron catalyst is utilized to absorb high-activity hydroxide radicals adjacent to the petroleum hydrocarbon, and an absorption state petroleum hydrocarbon is directly oxidized, so that the oxidation efficiency is high; furthermore, the dose of H2O2 is greatly saved, and the use ratio of H2O2 is high; and the method for degrading solid phase adsorbed state petroleum hydrocarbon in petroleum contaminated soil is temperate in reaction condition, little in the heat production, low in degree of damage on the soil organic matters and the microbes, free from secondary pollution, and beneficial for subsequent biological repair.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and relates to a repair method for oil-polluted soil, in particular to a method for degrading solid-phase adsorbed petroleum hydrocarbons in oil-polluted soil. Background technique [0002] by H 2 o 2 and Fe 2+ The composed Fenton reagent is cheap and easy to get, and H 2 o 2 It has strong permeability in the soil and can be directly used in oil well pollution sites to achieve in-situ remediation. Therefore, modified Fenton in-situ oxidation (MF-ISCO) is currently one of the in-situ remediation techniques widely used in oil-contaminated soils around the world. However, petroleum pollutants are mostly hydrophobic organic pollutants, which can be stored in the soil matrix in the form of adsorption for a long time, and the release is very slow, while the hydroxyl radicals produced in the water phase react quickly and have a very short life. , it disappears before the adsorbed petroleum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 徐金兰邓海鑫孙冬冬席安龙
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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