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Bioremediation device and method for radioactively contaminated soil

A soil biological and bioremediation technology, applied in the field of environmental pollution remediation, to achieve the effect of avoiding radiation damage

Inactive Publication Date: 2016-02-03
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a bioremediation device and method for radioactively polluted soil, which is used to solve the problem of large-scale treatment of radioactive pollution by utilizing the active bacterial solution of microorganisms such as acidophilic thiobacillus to solubilize + sulfate-reducing bacteria to absorb and precipitate dissolved radionuclides For the soil problem, the technical solution is as follows:

Method used

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  • Bioremediation device and method for radioactively contaminated soil
  • Bioremediation device and method for radioactively contaminated soil
  • Bioremediation device and method for radioactively contaminated soil

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Experimental program
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Embodiment 1

[0049] Add the active bacterial liquid of Acidophilus Thiobacillus thiooxidans into the soil contaminated with radionuclide strontium-90 at an amount of 6.9mL / 100g soil, and then culture the reaction culture rich in iron and sulfur at an amount of 1.7mL / 100g soil Base input, ventilation and stirring treatment for 10 ~ 14d. During this period, the circulating water is continuously heated by a temperature controller and an electric heating device to ensure that the temperature of the solution in the bioremediation reactor is the optimum growth temperature (30° C.) of acidophilic thiobacillus.

[0050] The dissolution of heavy metals may increase the pH value of the solution, so it may be necessary to add a certain amount of bioremediation additives from time to time to adjust the pH value, and under the high-speed stirring of the agitator, the pH value in the reactor is close to the state of uniform mixing, The pH electrode converts the pH value change of the solution in the bio...

Embodiment 2

[0056] Take the active bacterial solution of acidophilic Thiobacillus thiooxidans and the bioremediation auxiliary agent according to the ratio of 1.0:1.8 (v / v) and mix evenly, and the amount of the mixed solution of 105.26g soil / 100mL bacterial solution and auxiliary agent is reduced The radionuclide plutonium-239 contaminated soil is put into the soil, and then the reaction medium is put into the soil at an amount of 18.0mL / 100g, and the aeration and stirring treatment is carried out for 10~14d (120r / m). The automatic control method of process parameters (temperature T, pH value, OD value and Eh value) is the same as embodiment 1.

[0057] Analysis of experimental results after 14 days: After the above-mentioned treated soil was centrifuged and filtered, the removal rate of plutonium-239 was measured to be 88.89%, and the loss rates of plant nutrients total N, total P and organic matter were 10.67%, 8.46% and 8.26% respectively . The changes of plutonium-239 and plant nutri...

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Abstract

The invention relates to a bioremediation device and method for radioactively contaminated soil. The device comprises a temperature-controlled heating zone, a contaminated soil bioremediation reactor and a PLC monitoring system, which are sequentially connected, wherein a digital display type electric mixer, a micropore aerator, a pH automatic control device, an ORP automatic control device and a DO value automatic control device are arranged in the contaminated soil bioremediation reactor; the pH automatic control device, the ORP automatic control device and the DO value automatic control device are connected with the PLC monitoring system; and the PLC monitoring system comprises a PLC control panel and a server. The device and the method realize the effects of separating microorganisms from soil reaching standards and preventing operators from being hurt by radiation, and can effectively finish the treatment and remediation of the radioactively contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution restoration, and in particular relates to a radioactive contaminated soil bioremediation device and a restoration method. Background technique [0002] With the rapid development of nuclear energy science and technology, a large number of isotope applications, radioactive mining and metallurgy, national defense scientific research experiments, disposal of radioactive waste, and the gradual opening of nuclear weapon test bases have led to increasingly serious environmental radioactive pollution. Among them, the treatment and remediation of contaminated soil containing radionuclides has attracted increasing attention. International Radiation Protection Commission, International Atomic Energy Agency, U.S. EPA, U.S. Nuclear Regulatory Commission, and U.S. National Security Agency have formulated standards for remediation of radioactively contaminated soil. my country will soon issue re...

Claims

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Application Information

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IPC IPC(8): B09C1/10B09C1/00
CPCB09C1/10B09C1/00
Inventor 卢喜瑞袁世斌
Owner SOUTHWEAT UNIV OF SCI & TECH
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