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Method of purifying matter contaminated by heavy metal and apparatus therefor

A technology for purifying devices and pollutants, which is applied in the restoration of polluted soil and the removal of solid wastes, etc., and can solve the problems of miniaturization of difficult devices, inability to remove heavy metals, and reduction of sludge.

Inactive Publication Date: 2006-11-15
EBARA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in this method, there is a problem that since the cathode portion and the slurry are separated by the filter material, interstitial water flows from the anode side through the filter material to the cathode side, and the slurry cannot be reduced by the reduction potential of the cathode, On the contrary, sometimes there is a high possibility that the oxidation potential of the anode is maintained in an oxidizing atmosphere
[0006] However, in this method, there is a problem that the slurry cannot be kept in a reducing atmosphere due to the influence of chlorine gas, oxygen, etc. middle
[0008] However, even in this method, since no reduction potential is applied during the acid extraction, the fraction forming the above-mentioned insoluble adhesion form cannot be effectively extracted, and the concentration of heavy metals in the incineration ash cannot be sufficiently reduced.
[0009] In addition, in this method, there is also the following problem: the extraction of heavy metals into the solution and the separation from the aqueous solution cannot be carried out at the same time, but must be carried out in two stages, so the concentration of heavy metals in the aqueous solution increases during the extraction stage, especially Heavy metal salts with small solubility products cannot be completely dissolved
Furthermore, there is also the following problem: since the solid-liquid separation is performed in a state where heavy metals of high concentration are dissolved in the interstitial water, the heavy metals contained in the remaining interstitial water (sludge) cannot be removed from the incineration ash after the solid-liquid separation. remove
[0011] In addition, in these methods, there is a problem that in order to sufficiently dissolve heavy metals, the volume of the liquid phase as a solvent must be large due to the restriction of the solubility product as a poorly soluble substance, and as a result, the overall volume of the processing device becomes large. , it is difficult to miniaturize the device

Method used

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  • Method of purifying matter contaminated by heavy metal and apparatus therefor
  • Method of purifying matter contaminated by heavy metal and apparatus therefor
  • Method of purifying matter contaminated by heavy metal and apparatus therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0202] [Example 1] Electrodeposition removal test of lead-contaminated soil

[0203] As shown in Figure 1, a cation exchange membrane (NEOSEPTA CMB manufactured by Tokuyama Co., Ltd.) was set in the central part of a reactor made of plexiglass with a volume of 2000 mL, and the reactor was divided into two regions: a cathode region and an anode region.

[0204] In the cathode area, add 100g of insoluble lead-contaminated soil (the lead concentration is 5000mg / kg dry soil; sampling location: A paint factory), 800mL of tap water, 50mL of 1:1 hydrochloric acid, using Teflon (registered trademark) The completed stirring blade was stirred at a speed of 500rpm to obtain the tested system.

[0205] Insert the cathode electrode of the copper metal mesh into the system under test, and connect it to the anode through a constant potential device (constant voltage power supply device).

[0206] In the anode region, 800 mL of tap water and 5 mL of 1:1 hydrochloric acid were added, and an a...

Embodiment 2

[0212] [Example 2] Electrode reduction cleaning test of mercury pollution deposit

[0213] Such as figure 2 As shown, a cation exchange membrane (NEOSEPTA CMB manufactured by Tokuyama Co., Ltd.) is set in the central part of a reactor made of organic glass with a volume of 2000 mL, and the reactor is divided into two regions: a cathode region and an anode region.

[0214] In the cathode area, add 100g of insoluble lead-contaminated deposits (the total mercury concentration is 125mg / kg dry soil; sampling location: B pharmaceutical factory), 800mL of tap water, 50mL of 1:1 hydrochloric acid, use Teflon (registered trademark ) was stirred at a speed of 500rpm, a nitrogen diffuser pipe was inserted, and the cathode area was aerated with nitrogen at a speed of 10mL / min, which was used as the system under test.

[0215] Insert the cathode electrode of the titanium metal mesh into the system under test, and connect it to the anode electrode through a constant potential device. To ...

Embodiment 3

[0222] [Example 3] The influence of diaphragm on the electrolytic precipitation of lead-contaminated soil

[0223] As shown in Figure 1, a cation exchange membrane (NEOSEPTA CMB manufactured by Tokuyama Co., Ltd.) was set in the central part of a reactor made of plexiglass with a volume of 2000 mL, and the reactor was divided into two regions: a cathode region and an anode region. In the cathode area, add 100g of insoluble lead-contaminated soil (the lead concentration is 5000mg / kg dry soil; sampling location: A paint factory), 800mL of tap water, 50mL of 1:1 hydrochloric acid, using Teflon (registered trademark) The completed stirring blade was stirred at a speed of 500rpm to obtain the tested system. Insert the cathode electrode of the copper metal mesh into the test system, and connect it to the anode through a potentiostatic device (constant voltage power supply device). In the anode region, 800 mL of tap water and 5 mL of 1:1 hydrochloric acid were added, and a titanium ...

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Abstract

A purification method and apparatus in which even hardly soluble fractions of heavy metals contained in solid contaminated matters can be securely removed from solid contaminated matters, such as soil, sludge, sediment, waste and ash. Reaction vessel (2) is separated into anode section (10) including anode electrode (A) and cathode section (20) including cathode electrode (C) by means of diaphragm (M) interposed between the anode electrode (A) and the cathode electrode (C). Into the cathode section (20), there are fed solid contaminated matters containing heavy metals via solid contaminated matter supply means (22) and acid or alkali materials via acid or alkali material supply means (24) optionally together with water via water supply means (26). The resultant mixture in slurry form is maintained in a combination of reducing atmosphere and strongly acid or strongly alkali atmosphere so as to effect heavy metal leaching and electrodeposition on cathode electrode surface. The heavy metals are separated from the solid contaminated matters and interstitial water.

Description

technical field [0001] The present invention relates to the purification technology of substances polluted by heavy metals, in particular to the separation and removal of lead (Pb), cadmium (Cd) and mercury (Hg) from soil, sludge, sediment, waste, incineration ash and other solid pollutants Purification method and device for heavy metals. [0002] In addition, the present invention relates to the purification technology of substances polluted by heavy metals, especially from soil, sludge, sediment, waste, incineration ash and other solid pollutants containing heavy metals, eluents from the above pollutants, industrial A purification method and device for removing lead (Pb), cadmium (Cd), tin (Sn), chromium (Cr) and other heavy metals from water, drainage, surface water, groundwater, seawater and other heavy metal-containing liquids by pollutants. Background technique [0003] As a method of purifying and repairing soil contaminated with heavy metals, a method using an elect...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00B09C1/08
Inventor 足立昌则下村达夫
Owner EBARA CORP
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