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Fluid transportation and reaction integrated repairing method for organic-inorganic composite contaminated soil, and system thereof

A technology of polluted soil and inorganic composite, applied in the restoration of polluted soil, etc., can solve problems such as ineffective repair, and achieve the effect of reducing equipment investment, shortening repair cycle, and low cost

Pending Publication Date: 2018-10-19
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for organic-inorganic composite soils, existing single methods often cannot effectively repair

Method used

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  • Fluid transportation and reaction integrated repairing method for organic-inorganic composite contaminated soil, and system thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The polluted soil of a coking plant is cohesive soil, and the main pollutants are heavy metal chromium (CrⅥ) and benzene series (benzene, toluene, ethylbenzene). The organic-inorganic composite contaminated soil remediation method is used for treatment.

[0029] In the batching system, contaminated soil and water are mixed to prepare soil slurry, and the liquid-solid volume ratio is 5:1. Among them, the water flow is 60m 3 / h. The mixed slurry enters the pipeline reaction system under the action of the screw pump.

[0030] In the pipeline reaction system, the flow velocity of the soil slurry in the reaction pipeline is 0.05-0.08m / s. The total length of the reaction pipeline is 70m, and 4 (1#, 2#, 3#, 4#) feeding bypasses are set on the pipeline, and the interval between each bypass feeding point is 15m. Among them, 1# and 2# feed bypass to add heavy metal stabilizer (the main component is FeSO 4 ·7H 2 O), 3# and 4# feeding bypass add oxidizing agent (main component...

Embodiment 2

[0033] An explosion occurred in a hazardous chemical storage and transportation warehouse, resulting in the leakage of hazardous chemicals and causing soil pollution. After analysis, the soil type is sandy soil, and the main pollutants are sodium cyanide and methyl tert-butyl ether. The method for remediation of organic-inorganic composite polluted soil is adopted for treatment.

[0034] In the batching system, contaminated soil and water are mixed to make a slurry with a liquid-solid volume ratio of 2:1. Among them, the water flow is 90m 3 / h. The mixed slurry enters the pipeline reaction system under the action of the screw pump.

[0035] In the pipeline reaction system, the flow velocity of the soil slurry in the reaction pipeline is 0.3-0.5m / s. The total length of the reaction pipeline is 50m, and 3 (1#, 2#, 3#) feeding bypasses are set on the pipeline, and the interval between each bypass feeding point is 10m. Among them, hydrogen peroxide is added to the 1# feeding b...

Embodiment 3

[0038] A large amount of drilling cuttings solid waste was produced during the exploitation of an oilfield. After analysis, the soil type is cohesive soil, and the main pollutants are heavy metal chromium (CrVI) and crude oil, and the above-mentioned organic-inorganic composite polluted soil remediation method is used for treatment.

[0039]In the batching system, contaminated soil and a reversible solvent (N,N dimethylcyclohexylamine) were mixed to prepare a slurry with a liquid-solid volume ratio of 4:1. Among them, the reversible solvent flow rate is 150m 3 / h. The mixed slurry enters the pipeline reaction system under the action of the screw pump.

[0040] In the pipeline reaction system, the flow velocity of the soil slurry in the reaction pipeline is 0.08-0.1m / s. The total length of the reaction pipeline is 120m, and 3 (1#, 2#, 3#) feeding bypasses are set on the pipeline, and the interval between each bypass feeding point is 10m. 1#, 2# and 3# feed bypass to add hea...

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Abstract

The invention relates to a fluid transportation and reaction integrated repairing method for organic-inorganic composite contaminated soil. The method comprises the following steps: processing the organic-inorganic composite contaminated soil in a batching system to obtain a slurry, and inputting the obtained soil slurry into a pipeline reaction system by a screw pump; arranging a plurality of bypasses at different positions of a main pipeline in the pipeline reaction system; injecting reagents into the main pipeline through the dosing bypasses in the flowing process of the soil slurry, and allowing the reagents to be mixed with the soil slurry flowing in the pipeline and be reacted with compound contaminants in the soil slurry in order to degrade or solidify the contaminants and achieve the purpose of repairing soil; and allowing the slurry discharged from the pipeline to enter a solid-liquid separation system, and carrying out solid-liquid separation by using a solid-liquid separation device, wherein the separated soil is air-dried, and then is backfilled or granulated, and the separated liquid is treated and then is recycled to the batching system for reuse. The method has the advantages of simplicity in operation, low cost, high efficiency and energy saving.

Description

technical field [0001] The invention relates to the field of organic-inorganic composite polluted soil remediation technology and equipment, in particular to operation processes such as mixing, fluid transport, chemical reaction, and solid-liquid separation. technical background [0002] The harm of soil pollution to human health and ecological security has become increasingly prominent and cannot be ignored. The "National Soil Pollution Survey Bulletin" (2014) shows that the total exceeding rate of soil pollution in my country is as high as 16.1%. Action on soil restoration is urgent. At present, for organic polluted soil, the technical methods developed include thermal desorption, soil gas phase extraction, chemical oxidation, soil leaching, bioremediation, etc. Technologies developed for organically polluted soils include stabilization, electrokinetic remediation, and phytoremediation. However, for organic-inorganic composite soils, the existing single method often can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 何林李佳李鑫钢隋红李永红马媛
Owner TIANJIN UNIV
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