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Remediation Method of Heavy Metal Contaminated Soil Based on Ultrasonic Filtration

A technology for polluted soil and heavy metals, applied in the field of soil remediation, can solve the problems of reduced bioavailability, time-consuming, poor fixation efficiency, etc., and achieve the effect of fast and efficient remediation

Active Publication Date: 2020-07-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Heavy metal-contaminated soil treatment technologies include physical, chemical and biological methods. These methods have many defects such as low pollutant removal efficiency, high cost, and long cycle. Even after treatment, the land cannot continue to be cultivated.
For example, in the electrodynamic restoration of physical methods, in order to improve the migration efficiency of heavy metal ions in the porous soil medium, it is necessary to greatly reduce the pH value of the soil solution and apply a continuous and stable electric field to the soil, which is costly and time-consuming; chemical immobilization technology It is the addition of soil improvers to change the physical and chemical properties of the soil. Through the adsorption, precipitation or co-precipitation of heavy metals, the existence of heavy metals in the soil is changed, thereby reducing their bioavailability, and their fixation efficiency is poor. The process may still continue to accumulate in the crops; plant extraction technology is to plant some heavy metal hyperaccumulator plants, use their roots to enrich the heavy metals in the polluted soil to the aboveground parts of the plants, and remove the heavy metals in the polluted soil through regular harvesting , there are defects such as low enrichment efficiency and long treatment cycle

Method used

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  • Remediation Method of Heavy Metal Contaminated Soil Based on Ultrasonic Filtration
  • Remediation Method of Heavy Metal Contaminated Soil Based on Ultrasonic Filtration
  • Remediation Method of Heavy Metal Contaminated Soil Based on Ultrasonic Filtration

Examples

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Effect test

Embodiment 1

[0022] In this example, an experiment was carried out on a terraced field polluted by weathered slag leachate near a lead-zinc mine in Hunan. The soil was sticky red soil with an alkaline pH of 7.62 and a low organic matter content of only 4.8g / kg. Obviously high, about 1140μS / m; the average total concentration of Pb and Zn are 1624mg / kg and 2287mg / kg, respectively, and their main storage forms are shown in the table below.

[0023] The specific steps of this embodiment include:

[0024] ① After cleaning the surface plants, use a surface tiller to till and soak for 48 hours, and then dissolve disodium edetate and ammonium citrate with a molar ratio of 1:3 and evenly spray it on the surface of the polluted land;

[0025] ② After soaking for 6 hours, use a tiller to drive a needle roller ultrasonic vibration device to perform ultrasonic vibration treatment on the surface soil for 2 hours;

[0026] Such as figure 1 and figure 2 As shown, the needle-type ultrasonic vibrating d...

Embodiment 2

[0033] In this example, an experiment was carried out on a piece of cultivated land polluted by industrial wastewater in Guangdong. The soil was sticky brown soil, with a slightly acidic pH of 6.45, a normal organic matter content of 12.7 g / kg, and a high electrical conductivity of about 820 μS. / m; The mean total concentrations of heavy metals Cd and Cr are 470μg / kg and 191.5mg / kg respectively, and their main storage forms are shown in the table below.

[0034] The specific steps of this embodiment include:

[0035] ① After harvesting the cultivated crops, soak them in water for 24 hours, then use a surface tiller to plow the surface 20 cm of soil and break it; then dissolve diethylenetriaminepentaacetic acid and ammonium citrate with a molar ratio of 1:5 and evenly spray it on the surface of the polluted land;

[0036] ② Use a tiller to drive a needle-type ultrasonic vibration device (the needle length is 20 cm, and the horizontal distance is 20 cm) to perform ultrasonic vib...

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Abstract

The invention discloses a heavy metal contaminated soil remediation method based on ultrasonic suction filtration. The method comprises the following steps: performing organic polybasic acid sprayingor soaking on to-be-treated soil to free polyvalent heavy metal ions, performing ultrasonic treatment by a roller pin type ultrasonic vibrating device, enabling the soil surface layer to form a continuous water filling phase; and finally performing rapid suction filtration by a vacuum pad, and recovering the aqueous solution containing heavy metals in soil pores. According to the chemical characteristics of contaminated heavy metals in soil, by adopting specified organic polybasic acid soaking, the method disclosed by the invention has the characteristics of being short in treatment cycle, high heavy metal removal efficiency, high in environmental ecological safety and the like and can be widely applied to control and remediation of soil contaminated by various heavy metals.

Description

technical field [0001] The invention relates to a technology in the field of soil remediation, in particular to a method for remediating heavy metal polluted soil based on ultrasonic suction filtration. Background technique [0002] Heavy metal-contaminated soil treatment technologies include physical, chemical and biological methods. These methods have many defects such as low pollutant removal efficiency, high cost, and long cycle. Even after treatment, the land cannot continue to be cultivated. For example, in the electrodynamic restoration of physical methods, in order to improve the migration efficiency of heavy metal ions in the porous soil medium, it is necessary to greatly reduce the pH value of the soil solution and apply a continuous and stable electric field to the soil, which is costly and time-consuming; chemical immobilization technology It is the addition of soil improvers to change the physical and chemical properties of the soil. Through the adsorption, prec...

Claims

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Application Information

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IPC IPC(8): B09C1/02
CPCB09C1/02
Inventor 刘莉莉陈鑫唐周周纯淳武广哲董永成赵翰斌
Owner EAST CHINA UNIV OF SCI & TECH