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Method and device for remediating soil by using solubilizing and drainage-increasing mode

A technology for soil remediation and special device is applied in the field of soil remediation by means of solubilization and discharge enhancement, which can solve the problems of high energy consumption, high cost and poor operability, and achieve the effects of short remediation period, low cost and convenient operation.

Active Publication Date: 2021-01-01
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most remediation technologies in China are still in the stage of small-scale trials, and few technologies have been evaluated in field trials. For the remediation of contaminated sites, it is limited in the application of farmland soil due to problems such as high energy consumption, high cost and poor operability.

Method used

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  • Method and device for remediating soil by using solubilizing and drainage-increasing mode
  • Method and device for remediating soil by using solubilizing and drainage-increasing mode
  • Method and device for remediating soil by using solubilizing and drainage-increasing mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Depend on figure 1 It can be seen that the device is sequentially composed of a solubilizing device, an increasing discharge device and an increasing discharge liquid treatment and reuse device;

[0038] The solubilizing device includes a solubilizing solution storage tank, a solubilizing solution water valve and a solubilizing solution water pump;

[0039] The discharge-increasing device includes a solubilization and discharge-enhancing box, an underground ditch and a water valve;

[0040] The device for treating and reusing the enhanced discharge liquid includes a treatment channel for the enhanced discharge liquid, a water valve and a water pump.

[0041] One side of the solubilization solution storage tank is provided with a liquid outlet, and the liquid outlet is connected to the solubilization and discharge enhancement box through a flexible pipe, and a solubilization solution water valve and a solution enhancement water pump are arranged between the two; The co...

Embodiment 2

[0050] This example is an indoor optimization simulation experiment. The best parameter conditions for the solubilization of an environmentally friendly solubilizer, citric acid, are selected through a centrifuge tube: solubilizing concentration, soil-to-liquid ratio, pH value, and time. The solubilization and emission enhancement box is replaced by a solubilization bottle, and a dark layer of quartz sand is installed, and the waste liquid is discharged through two ways of dumping from above (upper row) and natural infiltration from below (lower row), obtained through laboratory simulation Optimal setting of soil heavy metal remediation parameters:

[0051] Citric acid (food grade) used in the experiment was purchased from Shandong Fengtai Biotechnology Co., Ltd. The soil for the test was collected from the surface soil of cultivated land in Houfu Village, Yantai City (37°15′48"N, 121°16′30"E), the soil type was brown soil, and the texture was sandy loam. The test soil was ai...

Embodiment 3

[0065] Experiment preferred parameters in embodiment 2 (citric acid concentration 0.3mol L -1 The ratio of soil to liquid is 1:1.5, the pH value is 2, first shake for 1 hour and then stand still for 5 hours, on the basis of the method of increasing the solution and discharging), adopt figure 1 The device is closer to the on-site soil conditions, and the method of heavy metal solubilization, discharge enhancement and removal is tested:

[0066] According to the device described in Example 1, the material of the solubilization and discharge enhancement box is PVC (length * width * height = 55cm * 40cm * 40cm) to simulate the field soil cleaning test conditions. A single-channel underground ditch (length × width × height = 55cm × 5cm × 10cm) is set in the solubilization and drainage enhancement box. Fill the ditch with air-dried wheat straw to enhance the fluidity of citric acid, so that it can diffuse from the small pores of the soil to the large pores of the crushed gravel thr...

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Abstract

The invention relates to the technical field of soil heavy metal pollution remediation, and especially relates to a method and a device for remediating soil in a solubilizing and drainage-increasing mode. Citric acid is used as a solubilizer to remove heavy metal cadmium in to-be-remediated contaminated soil, then water is added to form a citric acid water system to extract the soil, then heavy metal is effectively removed, treated waste liquid is discharged through a waste liquid treatment and recycling device, and soil remediation and drainage increasing liquid are treated together. The method reduces the soil heavy metal remediation difficulty, improves the remediation efficiency, has the advantages of low cost, convenience in operation, short remediation period, no damage to the soil environment and the like, and can solve the risk of secondary pollution caused by residual solubilizers in soil or migration of the solubilizers in underground water; and conditions are created for environment-friendly rapid remediation and application of farmland soil heavy metal.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal pollution in soil, in particular to a method and device for remediating soil by means of solubilization and discharge enhancement. Background technique [0002] Soil heavy metal pollution has become one of the most common and serious environmental problems worldwide, posing a major threat to human health and ecological security. Cadmium pollution in farmland soil has the characteristics of low concentration, long-term and accumulation. Its excessive accumulation in the soil will increase the absorption of heavy metals by crops, affecting the yield and quality of crops. Heavy metals entering the food chain will bring huge risks to human health. . Therefore, there is an urgent need for remediation research on cadmium-contaminated farmland soils to improve the quality and safety of agricultural products. [0003] At present, the in-situ remediation of heavy metal pollution in far...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/02
CPCB09C1/08B09C1/02
Inventor 杨帅李远贠豪骆永明
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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