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A method for joint treatment of strontium ion pollution by using montmorillonite-urea decomposing bacteria

A technology of urea decomposing bacteria and combined treatment, which is applied in the restoration of polluted soil and other directions, can solve problems such as unreported research, and achieve the effects of abundant resources, reduced treatment costs, and low costs.

Active Publication Date: 2018-11-06
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In terms of microbial remediation technology and montmorillonite adsorption performance, there have been related studies on the treatment of heavy metal ions and nuclide ions by using microorganisms or montmorillonite alone, but there is no report on the joint treatment of heavy metal ions by montmorillonite and microorganisms

Method used

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  • A method for joint treatment of strontium ion pollution by using montmorillonite-urea decomposing bacteria
  • A method for joint treatment of strontium ion pollution by using montmorillonite-urea decomposing bacteria

Examples

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Embodiment 1

[0017] Example 1 A method of using montmorillonite-urea decomposing bacteria to jointly control strontium pollution. According to the volume ratio of 1:20, montmorillonite is added to the water body with a strontium concentration of 1200 mg / L. After 4.5 hours, the ratio Add 1:40 urea, 1:50 peptone and the prepared ureolytic bacteria Klebsiella sp. to the above water body at a volume ratio of 1:40, and keep the temperature range between 28°C and 30°C. Use the montmorillonite-urea decomposing bacteria system to interact with strontium ions for 7 days, sample 10mL and centrifuge at 4000r / min for 10min, take 1mL of the supernatant, and use it to test the remaining strontium ion concentration in the water after dilution, and finally the removal rate of strontium ions 96%.

Embodiment 2

[0018] Example 2 A method of using montmorillonite-urea decomposing bacteria to jointly control strontium pollution. According to the volume ratio of 1:30, montmorillonite is added to the water body with a strontium concentration of 1200 mg / L. After 2.5 hours, the ratio Add urea at 1:40, peptone at 1:50, and prepared ureolytic bacteria Klebsiella sp. to the above water body at a volume ratio of 1:40, and keep the temperature range between 28°C and 30°C. Use the montmorillonite-urea-decomposing bacteria system to interact with strontium ions for 10 days, sample 10mL and centrifuge at 4000r / min for 10min, take 1mL of the supernatant, and use it to test the concentration of remaining strontium ions in the water after dilution, and finally the removal rate of strontium ions 95%.

Embodiment 3

[0019] Example 3 A method of using montmorillonite-urea decomposing bacteria to jointly control strontium pollution. According to the volume ratio of 1:35, montmorillonite is added to the water body with a strontium concentration of 1200 mg / L. After 4.5 hours, the ratio Add urea: 40, peptone 1:50 and prepared ureolytic bacterium Klebsiella sp. to the above water body at a volume ratio of 1:50, keeping the temperature range between 28°C and 30°C. Use the montmorillonite-urea decomposing bacteria system to interact with strontium ions for 8 days, sample 10mL and centrifuge at 4000r / min for 10min, take 1mL of the supernatant, and use it to test the concentration of remaining strontium ions in the water after dilution, and finally the removal rate of strontium ions 90%.

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Abstract

The invention provides a method for joint administration of strontium ion pollution through montmorillonite-urea decomposer. A urea decomposer is separated from the natural environment and grafted into a fluid nutrient medium, and cultivation is carried out for 24 hours to 48 hours under the condition that the temperature ranges from 25 DEG C to 37 DEG C; according to the mass ratio or volume ratio being 1:50-1:5, montmorillonite is added into soil or a water body with the strontium ion density ranging from 200 mg / L to 2000 mg / L; and after 0 to 12 hours, 1:100-1:10 of urea, 1:50-1:10 of peptone and the urea decomposer obtained in the first step are added into a polluted object according to the proportion being 1:80-1:20, cultivation is carried out for 1 d to 15 d after even stirring and mixing, and the removal rate of strontium ions in pollutant can reach 85% to 99%. The method is low in cost, efficient and practical, and has a wide application prospect.

Description

technical field [0001] The invention relates to the treatment of heavy metal pollutants, in particular to a method for treating heavy metal ion strontium pollution by combining biological and chemical methods. Background technique [0002] Heavy metal pollution refers to the phenomenon that human activities bring heavy metals into the soil, causing the content of heavy metals in the soil to be significantly higher than its natural background value, and causing ecological damage and deterioration of environmental quality. Heavy metal pollution has the characteristics of concealment, high toxicity, irreversibility, etc., and can affect human health through media such as water bodies or plants. Therefore, it is imminent to repair and control heavy metal pollution. Among them, strontium, as one of the fission products of the reactor, has a long half-life and strong toxicity. [0003] The current treatment technologies for heavy metal pollution include physical remediation, chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10B09C1/08
CPCB09C1/002B09C1/08B09C1/10B09C2101/00
Inventor 代群威许凤琴赵玉连王岩边亮
Owner SOUTHWEAT UNIV OF SCI & TECH
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