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Apparatus and method for repairing polluted soil and underwater by cooperation of in-situ electricity and electrochemistry

A technology of polluted soil and collaborative repair, which is applied in the restoration of polluted soil, etc., can solve the problems of ineffective use of electrode electrochemical reaction, high repair cost, cumbersome operation process, etc., to improve electrochemical catalytic activity and stabilize nanosheets Surface structure, effect of easy handling process

Inactive Publication Date: 2018-06-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods effectively utilize the physical or chemical reaction between the electrode material and pollutants in electrodynamic repair, but the electrode material needs to be replaced continuously, the operation process is cumbersome, the repair cost is high, and the electrochemical reaction of the electrode is not effectively used.

Method used

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  • Apparatus and method for repairing polluted soil and underwater by cooperation of in-situ electricity and electrochemistry
  • Apparatus and method for repairing polluted soil and underwater by cooperation of in-situ electricity and electrochemistry
  • Apparatus and method for repairing polluted soil and underwater by cooperation of in-situ electricity and electrochemistry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1. Preparation of an electrode with a nanometer surface structure for catalytic degradation of organic pollutants

[0036] (1) Get the nickel foam with a diameter of 5.7 cm, soak it in acetone ultrasonically for 15 minutes, clean it with ultrapure water, then soak it with 1% sulfuric acid ultrasonically for 15 minutes, clean it with ultrapure water, and dry;

[0037] (2) Get 250mL electrolyte in 260mL electrolytic cell, take step (1) nickel foam as working electrode, mixed oxide (MMO) electrode as counter electrode, Ag / AgCl saturated KCl as reference electrode, form three-electrode system; The electrolyte composition is: 0.03mol / L copper sulfate (CuSO4 ·5H 2 O), 0.0025mol / L nickel sulfate (NiSO 4 ·6H 2 O), 0.24mol / L sodium dihydrogen phosphate (NaH 2 PO 4 ·H 2 O), 0.05mol / L sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O), 0.50mol / L boric acid (H 3 BO 3 );

[0038] (3) Set the cathode potential to -0.92V, carry out constant potential deposition at room temp...

Embodiment 2

[0040] Embodiment 2. Preparation of advanced oxidation air cathode

[0041] (1) Take a titanium mesh with a diameter of 5.7 cm, soak it with acetone ultrasonically for 15 minutes, clean it with ultrapure water, then soak it with 1% sulfuric acid ultrasonically for 15 minutes, clean it with ultrapure water, and dry it;

[0042] (2) Dissolving the PVDF powder in a dimethylacetamide (DMAc) solution, ultrasonically stirring and dissolving, and preparing a PVDF solution with a concentration of 10%;

[0043] (3) Weigh 700mg of activated carbon, 70mg of carbon black, and 2.33mL of 10% PVDF solution, mix well, and evenly smear on one side of the titanium mesh in (1);

[0044] (4) Submerge the smeared electrode in ultrapure water for 30 minutes, take it out and put it in a fume hood to dry naturally for later use, that is, construct an advanced oxidation air cathode.

Embodiment 3

[0045] Embodiment 3. Electric device and method for remediating polluted soil and groundwater in situ

[0046] (1) Preparation of electrolyte: Add sodium sulfate to a certain amount of ultrapure water to prepare 1.3g / L Na 2 SO 4 The solution is ready for use; another 1.3g / L Na 2 SO 4 Solution, add excess trichlorethylene, prepare saturated trichlorethylene solution, as simulated polluted groundwater.

[0047] (2) Preparation of simulated soil to be tested: 31% kaolin and 69% quartz sand (100-200 mesh) were fully mixed evenly, and the prepared electrolyte was a solution to control the initial moisture content of the tested soil to 23.5%, and the bulk density to 1.9 g / cm 3 , packed in a columnar reactor with a diameter of 5cm and a length of 10cm; refer to figure 2 , columnar reactor both sides respectively connect diameter 5cm, long 5cm columnar reactor as anode electrolyzer 4 and cathode electrolyzer 10, and separate with test soil with glass fiber filter paper and nylon...

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Abstract

The invention relates to an apparatus and a method for repairing polluted soil and underwater by cooperation of in-situ electricity and electrochemistry. In the method, a mono-metal or double-metal electrode having a nano-scale surface or an air cathode having advanced pollutant oxidation function is formed for reducing and degrading organic pollutants, then the formed electrode is used as a cathode in the electric repairing apparatus; a direct-current electric field is applied to a medium to migrate the organic pollutants in the medium to the cathode, thus achieving cooperation of electric field driven pollutant migration and in-situ electrode electrochemical degradation. The method avoids complex engineering problems, such as secondary treatment after extraction of a cathode solution, extra addition of a redox agent, arrangement of PRB and the like, during a conventional electric repairing process, and can significantly reduce engineering work load and repairing cost in the electricrepairing. The invention provides the in-situ repairing method for the polluted soil and underwater, which is simple in preparation, is low in cost and has high-effective cooperation.

Description

technical field [0001] The invention belongs to the technical field of soil and groundwater remediation, is suitable for in-situ remediation of polluted soil and groundwater, and particularly relates to an in-situ electrokinetic-electrochemical collaborative remediation device and method for polluted soil and groundwater. Background technique [0002] In the investigation of soil and groundwater pollution around the world, organic pollutants are frequently detected, which seriously threaten the health of residents and the safety of drinking water. However, in the process of groundwater remediation carried out successively, the phenomenon of incomplete remediation of pollutants and rebound of concentration often occurs, which is mainly limited by the material composition and structural characteristics of low-permeability formations and the reverse diffusion of pollutants in this formation. Due to the limitation of hydraulic conditions in the formation, traditional groundwater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/002B09C1/085B09C2101/00
Inventor 张芳刘波李广贺张帅张旭侯德义
Owner TSINGHUA UNIV
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