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Soil and underground water in-situ synergistic repair method

A technology of collaborative restoration and groundwater, applied in the restoration of polluted soil, etc., can solve problems such as the inability to provide living conditions for microorganisms, the inability of microorganisms to degrade pollutants, and the secondary pollution of chemical reagents. , the effect of eliminating pollutants

Inactive Publication Date: 2019-08-27
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the remediation methods of oil-contaminated soil and groundwater mainly include physical, chemical and biological methods; the first two methods are relatively expensive, and the mechanism of physical methods to remove oil pollution is mainly the migration of pollutants, which has not fundamentally solved the problem. Pollution problems, the chemical reagents used in the chemical method are likely to cause secondary pollution, so the biological method is currently the main process for remediating polluted soil and groundwater
However, in the existing bioremediation technology, the ectopic bioremediation of polluted soil and groundwater requires large-scale excavation of contaminated soil and extraction of groundwater. In situ bioremediation cannot provide the best living conditions for microorganisms, and microorganisms cannot degrade all pollutants Contaminants, long repair time

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  • Soil and underground water in-situ synergistic repair method
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preparation example Construction

[0028] (3) the preparation method of described petroleum degrading bacterium agent can comprise the following steps:

[0029] Step 1, using an extractant to extract petroleum pollutants from polluted soil and groundwater, and then evaporating the extractant to obtain petroleum pollutants.

[0030] Step 2, NaCl, NH 4 Cl, MgSO 4 , KCl, FeSO 4 ·7H 2 O, CaCl 2 Added to the petroleum pollutants and diluted with distilled water to prepare inorganic salt culture medium with a pH value of 7.0-7.5. Among them, every 1000ml inorganic salt medium uses 10g NaCl, 0.5g NH 4 Cl, 0.5g MgSO 4 , 0.1g KCl, 0.02g FeSO 4 ·7H 2 O, 0.1g CaCl 2and 1ml of petroleum contamination from step 1.

[0031] Step 3. According to the ratio of using 200mL of the inorganic salt medium for every 15g of contaminated soil, add the contaminated soil to the inorganic salt medium, and acclimatize it in a constant temperature oscillator with a temperature of 30°C and a rotation speed of 180r / min Cultivate fo...

Embodiment 1

[0041] An in-situ collaborative restoration method for soil and groundwater, comprising: adding carbon elements, nitrogen elements, phosphorus elements, and oil-degrading bacterial agents with a concentration of 5,000 to 10,000 mg / L accounting for 0.6% of the total volume of the reinjection water to the reinjection water, and the carbon element , The weight ratio of nitrogen and phosphorus is C:N:P=100:5:1, and the reinjection water is aerated, and the aeration rate is kept at 1.8mg / L, thereby forming the final reinjection water; liquid injection pump 2 The final reinjection water is drawn from the bioaugmentation regulating pool 1, and reinjected into the formation through the reinjection well 3, so that the soil and groundwater can be restored in situ.

[0042] Specifically, the preparation method of the petroleum degrading bacterial agent may comprise the following steps:

[0043] Step A1, using an extractant to extract petroleum pollutants from polluted soil and groundwate...

Embodiment 2

[0049] An in-situ collaborative restoration method for soil and groundwater, comprising: adding carbon elements, nitrogen elements, phosphorus elements, and oil-degrading bacterial agents with a concentration of 5,000 to 10,000 mg / L accounting for 1% of the total volume of the reinjection water to the reinjection water, and the carbon element , the weight ratio of nitrogen and phosphorus is C:N:P=100:5:1, and the reinjection water is aerated, and the aeration rate is maintained at 2mg / L, thereby forming the final reinjection water; the injection pump 2 starts from The final reinjection water is extracted from the bioaugmentation regulating pool 1 and reinjected into the stratum through the reinjection well 3, so that the soil and groundwater can be restored synergistically in situ.

[0050] Specifically, the preparation method of the petroleum degrading bacterial agent may comprise the following steps:

[0051] Step B1, using an extractant to extract petroleum pollutants from ...

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Abstract

The invention discloses a soil and underground water in-situ synergistic repair method. The method comprises the steps that a carbon element, a nitrogen element and a phosphorus element are added intoreinjection water, the weight ratio of the carbon element to the nitrogen element to the phosphorus element (C:N:P) is 100:5:1, a petroleum degradation bacterium with the concentration being 5,000-10,000 mg / L accounting for 0.5-1.2% of the total volume of the reinjection water is added into the reinjection water, meanwhile, aeration is performed on the reinjection water, the aeration amount is kept at 1.5-2 mg / L, and therefore final reinjection water is formed; a liquid charge pump extracts the final reinjection water from a biological enhancement adjusting tank, and reinjects the reinjectionwater into a stratum through reinjection, and in-situ synergic repair of soil and underground water is achieved. The biology growth speed is high, the biologic degrading speed is high, contaminated soil and underground water can be rapidly repaired, the repair effect is good, the repair technology is simple, the repair cost is low, contaminated soil does not need to be excavated in large area, alarge number of water resources are saved, and no secondary pollution is caused.

Description

technical field [0001] The invention relates to the technical field of reinjection water in-situ restoration of soil and groundwater, in particular to a method for in-situ collaborative restoration of soil and groundwater. Background technique [0002] Oil production sewage is the oily sewage produced with oil production after dehydration and separation of crude oil. This part of sewage not only contains petroleum substances, but also contains solid suspended solids, dispersed oil, slick oil, emulsified oil, chemical agents and other components. In order to protect the environment and save water resources, in the prior art, oil extraction wastewater is usually treated to form reinjection water, and then the reinjection water is used as production water to reinject into the formation. [0003] Crude oil is prone to leakage accidents during mining, transportation, loading and unloading, processing and use projects, which will cause large-scale soil pollution. The leaching and...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/10
CPCB09C1/002B09C1/02B09C1/10B09C2101/00
Inventor 桑义敏何燎艾贤军余望朱玲
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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