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In-situ preparation method and application of a coastal oil-contaminated soil remediation agent

A soil remediation agent and oil-polluted technology, which is applied in the field of in-situ preparation of coastal oil-contaminated soil remediation agents, can solve the problems that limit the large-scale application of bioaugmentation technology and high cost, achieve low cost, abundant sources, and overcome the partial operation cost high effect

Inactive Publication Date: 2020-04-24
DALIAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0004] In the current bioaugmented soil remediation technology, the main problems are: the cost of co-metabolism substrates, nutrients, biosurfactants and bacterial agents used in the remediation implementation process is high (especially the cost of bacterial agents and biological surfaces active agent), which severely limits the large-scale application of bioaugmentation technology in contaminated soil remediation

Method used

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  • In-situ preparation method and application of a coastal oil-contaminated soil remediation agent

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Preparation of seaweed lysate

[0025] Collect kelp from the offshore, remove the surface sediment, transport it to the oil-contaminated soil, chop it in situ, mix it with water at a material-to-liquid ratio of 1:30, add it to the hydrothermal reactor, and control the temperature of the hydrothermal reactor to 160°C. The reaction time is 2 hours, and the hydrothermal cracking product is obtained; the hydrothermal cracking product obtained above is subjected to solid-liquid separation, and the precipitate is recovered, and the liquid phase part is the seaweed cracking solution;

[0026] (2) In situ preparation of restoration agent

[0027] Get the petroleum-contaminated soil on the surface, and after pulverizing, separate through a 100-mesh sieve to obtain the part through the sieve; the seaweed lysate obtained in step (1) is divided into two parts of equal volume, one part of which is added to the part through the sieve, Adjust the solid-liquid mass ratio to 0.8:10...

Embodiment 2

[0031] (1) Preparation of seaweed lysate

[0032] Collect kelp from the offshore, remove the surface sediment, transport it to the oil-contaminated soil, chop it in situ, mix it with water at a material-to-liquid ratio of 1:20, add it to the hydrothermal reactor, and control the temperature of the hydrothermal reactor to 180°C. The reaction time is 1.5 hours, and the hydrothermal cracking product is obtained; the hydrothermal cracking product obtained above is separated from solid and liquid, and the precipitate is recovered, and the liquid phase is the seaweed cracking solution;

[0033] (2) In situ preparation of restoration agent

[0034] Get the petroleum-contaminated soil on the surface, and after pulverizing, separate through a 100-mesh screen to obtain the part that passes through the screen; the seaweed lysate obtained in step (1) is divided into two parts of equal volume, one part of which is added to the part that passes through the screen, Adjust the solid-liquid m...

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Abstract

The invention provides an in-situ preparation method and applications of a coastal petroleum polluted soil repairing agent, and belongs to the technical field of soil remediation in environmental engineering. The conditions of cracking of kelps are optimized, the cracking product is used as a matrix for the growth and metabolism of microbes, local microbes in polluted soil are in-situ cultured; the local microbes and the cracking product are mixed to prepare a repairing agent; and the repairing agent is applied to coastal petroleum polluted soil to carry out soil remediation under a stationarycondition. The method has the advantages that the sources of the repairing agent raw materials are abundant, the preparation technology is simple, the cost is low; a natural surfactant and bioactivesubstances in the repairing agent can improve the soil remediation efficiency and physical and chemical properties of soil; solved is the problem that in the prior art, the operation cost of a petroleum polluted soil remediation technology is high and the large scale application is limited therefore; and the provided repairing agent has a good application prospect in the fields of biological remediation of organic substance polluted soil, coastal wetland pollution treatment, and coastal petroleum pollution treatment.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering soil remediation, and relates to an in-situ preparation method and application of a coastal oil-contaminated soil remediation agent. Background technique [0002] About half of the world's oil fields are located in the coastal areas, and the extraction, storage, transportation, processing and use of oil will inevitably have an impact on the surrounding soil environment, resulting in varying degrees of oil pollution in the soil of oil areas and coastal wetlands, which seriously threatens coastal areas. Healthy development of the ecosystem. [0003] At present, there are mainly physical, chemical and biological methods for remediation of oil-contaminated soil. As for physical restoration technology (such as incineration method, solidification stabilization method, etc.), its cost is high and it is very destructive to soil ecology. In chemical remediation (such as surfactant leach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/14B09C1/00
CPCB09C1/00B09C2101/00C09K17/14
Inventor 王竞张子新王奉博
Owner DALIAN UNIV OF TECH
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