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In-situ remediation method aiming at dispersible petroleum-contaminated soil

An oil pollution and in-situ remediation technology, applied in the field of environmental engineering, can solve problems such as difficulty in adapting to dispersed oil-contaminated soil remediation, high chemical consumption, and low remediation efficiency

Active Publication Date: 2013-12-04
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these existing modification methods can improve the oxidation effect of adsorbed petroleum hydrocarbons to a certain extent, all of these methods are to modify the Fenton reagent before the repair, and the modification operation of the Fenton reagent has been completed before the repair, and often It is first to determine the formulation and dosage of the agent in the laboratory, and then add a fixed agent to the site for restoration. It is difficult to adapt to the restoration of dispersed oil-contaminated soil where the pollution situation changes. The restoration efficiency is low and the agent consumption is large.

Method used

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  • In-situ remediation method aiming at dispersible petroleum-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Restoration of S1 area in lightly polluted area

[0039] After measurement, the area of ​​oil-contaminated soil in the S1 area of ​​the lightly polluted area is 1m 2 , the average depth of pollution is 2cm. After sampling and weighing, the total amount of oil-contaminated soil in the S1 area of ​​the lightly polluted area is 53kg.

[0040] The OCMA-350 non-dispersive infrared petroleum analyzer is used to detect that the average concentration of petroleum hydrocarbons in petroleum-contaminated soil is 14.35g / kg. According to the concentration of petroleum hydrocarbons, it is necessary to configure H with a concentration of 150mmol / L. 2 o 2 . With crosslinking agent citric acid (17.4g / L) and FeSO 4 ·7H 2 O (9.7g / L) is formulated into iron solution, so that Fe in iron solution 2+ The concentration of the iron solution is 69.8mmol / L, and the pH value of the iron solution is adjusted with NaOH before use, so that the oil-contaminated soil remains neutral aft...

Embodiment 2

[0047] Example 2: Restoration of the S2 area in the moderately polluted area

[0048] After measurement, the area of ​​oil-contaminated soil in S2 area of ​​moderately polluted area is 1m 2 , The average depth of pollution is 2cm. After sampling and weighing, the total amount of oil-contaminated soil in the S2 area of ​​the lightly polluted area is 53kg.

[0049] The OCMA-350 non-dispersive infrared petroleum analyzer is used to detect that the average concentration of petroleum hydrocarbons in petroleum-contaminated soil is 23.23g / kg. According to the concentration of petroleum hydrocarbons, it is necessary to configure H with a concentration of 200mmol / L. 2 o 2 . With crosslinking agent citric acid (17.4g / L) and FeSO 4 ·7H 2 O (9.7g / L) is formulated into iron solution, so that Fe in iron solution 2+ The concentration of the iron solution is 69.8mmol / L, and the pH value of the iron solution is adjusted with NaOH before use, so that the oil-contaminated soil remains neutr...

Embodiment 3

[0055] Example 3: Restoration of the heavily polluted area S3 area

[0056] After measurement, the area of ​​oil-contaminated soil in the S3 area of ​​the heavily polluted area is 1m 2 ,, The average depth of pollution is 2cm. After sampling and weighing, the total amount of oil-contaminated soil in the S3 area of ​​the lightly polluted area is 53kg.

[0057] The OCMA-350 non-dispersive infrared petroleum analyzer is used to detect that the average concentration of petroleum hydrocarbons in petroleum-contaminated soil is 95.62g / kg. According to the concentration of petroleum hydrocarbons, it is necessary to configure H with a concentration of 350mmol / L. 2 o 2 . With crosslinking agent citric acid (17.4g / L) and FeSO 4 ·7H 2 O (9.7g / L) is formulated into iron solution, so that Fe in iron solution 2+ The concentration of the iron solution is 69.8mmol / L, and the pH value of the iron solution is adjusted with NaOH before use, so that the oil-contaminated soil remains neutral a...

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Abstract

The invention mainly aims to provide an in-situ remediation method aiming at dispersible petroleum-contaminated soil, which is used for remediating dispersible non-uniformly petroleum-contaminated soil. By means of adjusting the operation technical parameters such as adding amount and adding frequency of an agent and changing the technical parameters according to different positions and different contamination degrees, in-situ remediation is performed on petroleum contamination at an oil well site. A movable integral agent adding device is adopted and is internally provided with an H2O2 and catalyst iron solution tank. H2O2 is sprinkled by using a spray head; and the H2O2 utilization efficiency is higher in a low-dosage multiple H2O2 adding mode, so that the remediation of the dispersible petroleum-contaminated soil is realized. The in-situ remediation method has the advantages of simple treatment process, flexible operation mode, high H2O2 utilization rate, low process and engineering operation cost, high treatment efficiency, contribution to subsequent biological remediation process and obvious economic benefit and environmental benefit.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to an in-situ modified oxidation repair method for dispersed petroleum-contaminated soil. Background technique [0002] According to incomplete statistics, there are about 1 million oil production wells in my country, and each well produces 0.5 to 2.0 tons of crude oil per year on average, and nearly 600,000 tons of oil enters the soil environment every year to cause pollution, and the area of ​​oil-contaminated soil reaches 75,000 mu. The degree of oil pollution in these soils is not uniform. The intensity of oil pollution varies from 50g / kg to 450g / kg. The polluted areas are discontinuous. The oil production wells are distributed in Tarim Oilfield, Changqing Oilfield, Yumen Oilfield, Qinghai Oilfield, Shengli Oilfield, and Daqing Oilfield. , Jidong Oilfield and other oilfields are spread across dozens of provinces and regions including Xinjiang, Shaanxi, Gansu, Q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 徐金兰畅坤孙冬冬张洁邓海鑫
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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