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Remediation device and method for hexavalent chromium contaminated soil

A technology of polluted soil and remediation method, which is applied in the field of remediation devices for hexavalent chromium polluted soil, can solve the problems of increasing the amount of solidified treatment wastewater, many times of rinsing, and many eluents, etc. Good effect and consumption saving effect

Pending Publication Date: 2022-03-18
成都酉辰环境检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing remediation process of hexavalent chromium-contaminated soil is mainly to wash out the hexavalent chromium in the soil by repeatedly rinsing the contaminated soil for many times, and then solidify it. Consumed a lot of eluent, increasing the amount of wastewater for subsequent solidification treatment

Method used

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  • Remediation device and method for hexavalent chromium contaminated soil
  • Remediation device and method for hexavalent chromium contaminated soil
  • Remediation device and method for hexavalent chromium contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The repair process of the existing hexavalent chrome contaminated soil is mainly to repeat the contaminated soil for repeatedly collining through the collections, so that the six-price chromium in the soil is completely collected, and the curing is carried out, and the number of elution is more, efficiency Low, and consumes a lot of elongated liquid, increase subsequent curing treatment waste water.

[0047] In order to solve the problem of prior art, the embodiment of the present invention provides a repairing apparatus and method of a six-rate chromium contaminated soil, wherein the repair method comprises the steps of:

[0048]S1. Formulate the collapse, and the illenol is preheated (a preheating temperature is 40 ° C), and the preheated collisher is stirred with the contaminated soil at 60 ° C for 3 h. In heating environments, hexavalent chromium can be increased. The collisher can be a kind of hydrochloric acid, citric acid, oxalic acid, and acetic acid. This example i...

Embodiment 2

[0068] Embodiments of the present invention provide a repair method for a six-rate chrome contaminated soil, including the following steps:

[0069] S1. Formulate the collapsed liquid and preheat the collapse (a preheating temperature of 45 ° C), and the preheated collapsed liquid is stirred at 70 ° C for 4 h at 70 ° C after stirring. The colloration is one of hydrochloric acid, citric acid, oxalic acid, and acetic acid. This example is preferably pH 2.5 citric acid solution.

[0070] After the stirring is completed, the contaminated soil is filtered, and the soil is removed by the preheated straw liquid to obtain the suction filtration.

[0071] S3. The filtration fluid enters an electrochemical reaction tank, and the hexavalent chromium is reduced to trivalent chromium by electrochemical reaction, and chromium hydroxide precipitation is formed.

[0072] S4. The electrolytic filtration liquid enters the precipitated tank, precipitates chromium hydroxide, and recovered the superna...

Embodiment 3

[0074] Embodiments of the present invention provide a repair method for a six-rate chrome contaminated soil, including the following steps:

[0075] S1. Formulate the collapsed liquid, and perform preheating (50 ° C with a preheating temperature), and the preheated collisher is stirred with the contaminated soil at 80 ° C for mixing for 5 h. The colloration is one of hydrochloric acid, citric acid, oxalic acid, and acetic acid. This example is preferably a citric acid solution of pH3.

[0076] After the stirring is completed, the contaminated soil is filtered, and the soil is removed by the preheated straw liquid to obtain the suction filtration.

[0077] S3. The filtration fluid enters an electrochemical reaction tank, and the hexavalent chromium is reduced to trivalent chromium by electrochemical reaction, and chromium hydroxide precipitation is formed.

[0078] S4. The electrolytic filtration liquid enters the precipitated tank, precipitates chromium hydroxide, and recovered th...

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Abstract

The invention discloses a laboratory hexavalent chromium contaminated soil remediation device and method.The method comprises the steps that prepared leacheate is preheated, and the preheated leacheate and contaminated soil are stirred and mixed for 3-5 h at the temperature of 60-80 DEG C; after stirring is finished, the contaminated soil is subjected to suction filtration, and under the suction filtration condition, the contaminated soil is leached with preheated leacheate, and suction filtration liquid is obtained; the suction filtration liquid enters an electrochemical reaction tank, hexavalent chromium in the suction filtration liquid is reduced into trivalent chromium through an electrochemical reaction, and chromic hydroxide precipitates are formed; and leacheate obtained after electrolysis enters a sedimentation tank, chromic hydroxide precipitate is precipitated, and supernate is recycled and used as new leacheate. The repairing device is used for implementing the method. The leacheate and the contaminated soil are stirred and mixed, then the leacheate is subjected to suction filtration, the contaminated soil is leached with the leacheate under the suction filtration condition, the leaching speed is high, the leaching effect is good, the use amount of the leacheate is greatly reduced, and the wastewater amount of subsequent solidification treatment is reduced.

Description

Technical field [0001] The present invention relates to soil repair techniques, and in particular, to a repairing apparatus and method of a six-rate chromium contaminated soil. Background technique [0002] Soil is the resource that cannot be replaced in human survival and development. With the development of heavy industry, soil heavy metal pollution has become a serious problem facing contemporary human beings, of which hexavalent chromium is typical soil pollutants in my country, the environment and human body Large, thus, the repair of hexavalent chrome pollution soil is extremely important. [0003] The repair process of the existing hexavalent chrome pollution soil is mainly by repeating the contaminated soil, so that the six-priced chromium in the soil is completely collected, and the curing is carried out, the number of elongated times is much, the efficiency is low, and The consumption of the elongated liquid, increase the subsequent curing treatment waste water. Invent...

Claims

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Application Information

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IPC IPC(8): B09C1/02
CPCB09C1/02Y02P10/20
Inventor 邹宏菁李琴沈娟
Owner 成都酉辰环境检测有限公司
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