Biochar-bioelectrochemistry coupled soil remediation system and method

A bioelectrochemical and soil remediation technology, applied in the field of soil in-situ remediation, can solve the problems of hindering the degradation of pollutants and large internal resistance, and achieve the effects of shortening the degradation cycle, low equipment cost, and low energy consumption

Inactive Publication Date: 2020-05-19
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the aquatic environment, the internal resistance of soil or sediment is larger, which limits the electron transfer between the electrode-microbe-pollutant and hinders the degradation of the pollutant.
In soil bioelectrochemical systems, electroactive microorganisms are limitedly enriched on the electrode surface, resulting in the removal of pollutants only within a few centimeters from the electrode surface.

Method used

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  • Biochar-bioelectrochemistry coupled soil remediation system and method
  • Biochar-bioelectrochemistry coupled soil remediation system and method
  • Biochar-bioelectrochemistry coupled soil remediation system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A biochar-coupled bioelectrochemical soil remediation system includes a bioelectrochemical reactor and biochar 6 for mixing with the soil to be remediated. The bioelectrochemical reactor includes a reaction vessel for holding the soil to be repaired 5, an electrode for inserting the soil to be repaired 5, and an electrochemical workstation 1; the electrodes include a working electrode 2, an auxiliary electrode 3 and a reference electrode 4, and the working electrode 2. The auxiliary electrode 3 and the reference electrode 4 are electrically connected to the electrochemical workstation 1 .

[0041] Specifically, the structure of the soil restoration system of the present embodiment, and the soil restoration method are as follows:

[0042] 1) Design of bioelectrochemical reactor:

[0043] Use a square simulated reactor: use a rectangular polypropylene container of 30×5×5cm (length×width×height), fill it with PCP-contaminated soil with a total volume of 200mL, and distrib...

Embodiment 2

[0052] Compared with Example 1, the difference is that the pyrolysis temperature of biochar in this example is 600°C, and the obtained biochar is named BC600; 4) In the proportion of contaminated soil and biochar and operating parameters, 0%, 1 %, 6% (mass fraction) of BC600 were mixed with the soil respectively, and the above treatments were abbreviated as SBES, SBES-BC600 (1%), and SBES-BC600 (6%). Cultivate at room temperature (25-28°C);

[0053] Other raw materials and steps are identical with embodiment 1.

[0054] Experimental results such as Figure 4 as shown, Figure 4 (b) is the degradation situation of different positions (4-28cm) away from the cathode in the SBES treatment; Figure 4 (c) SBES-BC600 (1%) degrades from different positions (4 to 28 cm) away from the cathode in the treatment; Figure 4 (d) is the degradation of different positions (4-28cm) from the cathode during the treatment of SBES-BC600 (6%).

Embodiment 3

[0056] Compared with Example 1, the difference is that the pyrolysis temperature of biochar in this example is 900°C, and the obtained biochar is named BC900; 4) In the ratio of contaminated soil to biochar and operating parameters, 0%, 1 %, 6% (mass fraction) of BC900 were mixed with the soil respectively, and the above treatments were abbreviated as SBES, SBES-BC900 (1%), SBES-BC900 (6%), and each treatment was set in three parallels, and placed in the dark Cultivate at room temperature (25-28°C);

[0057] Other raw materials and steps are identical with embodiment 1.

[0058] Experimental results such as Figure 5 as shown, Figure 5 (b) is the degradation situation of different positions (4-28cm) away from the cathode in the SBES treatment; Figure 5 (c) SBES-BC900 (1%) degrades from different positions (4 to 28 cm) away from the cathode in the treatment; Figure 5 (d) is the degradation of SBES-BC900 (6%) at different positions (4-28cm) away from the cathode during th...

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Abstract

The invention discloses a biochar-bioelectrochemistry coupled soil remediation system and method. The soil remediation system comprises a bioelectrochemical reactor and biochar which is to be mixed with to-be-remediated soil. The bioelectrochemical reactor comprises a reaction container used for containing the to-be-remediated soil, electrodes used for being inserted into the to-be-remediated soiland an electrochemical workstation, wherein the electrodes comprise a working electrode, an auxiliary electrode and a reference electrode, and the working electrode, the auxiliary electrode and the reference electrode are electrically connected with the electrochemical workstation. The biochar-bioelectrochemistry coupled soil remediation system provided by the invention is suitable for in-situ remediation of soil, capable of reducing the environmental risk of secondary pollution caused by a physicochemical remediation method, shortening the degradation period of pollutants and increasing theeffective degradation radius of soil pollutant degradation, low in equipment cost, low in energy consumption and capable of being widely applied to in-situ remediation of persistent organic contaminated soil.

Description

technical field [0001] The invention relates to the technical field of soil in-situ remediation, and more specifically, relates to a biochar-coupled bioelectrochemical soil remediation system and method. Background technique [0002] The organic matter produced in the process of industrialization and agricultural planting intensification migrates under the action of volatilization, adsorption, desorption and leaching, causing pollution to the soil environment. Persistent organic pollutants have become the focus of global soil environmental protection because of their high toxicity, difficult decomposition, long residual period and high residual amount. Persistent organic compounds are mainly divided into three categories: pesticides, industrial chemicals (such as polychlorinated biphenyls) and by-products (such as dioxins) produced in the production process. At this stage, the number of pollutants has increased from 12 to 29, and is still increasing gradually. Soil and sed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/085B09C1/10B09C2101/00
Inventor 袁勇蔡茜茜王逸周顺桂
Owner GUANGDONG UNIV OF TECH
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