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A method of using Aspergillus niger to decompose phosphate rock powder to restore u(vi) polluted water

A technology of phosphate rock powder and Aspergillus niger, applied in the field of U-polluted water bodies, can solve the problems of secondary environmental pollution, secondary treatment difficulties, high treatment costs, etc., and achieve the effects of reduced alkali consumption, good repair effect, and simple process

Active Publication Date: 2016-08-24
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bentonite method has the advantages of large treatment capacity and low cost, but when treating this type of uranium wastewater, it is greatly interfered by other chemical components and the treatment efficiency is low
[0004] To sum up, using the currently developed methods to treat U(VI) polluted water bodies has disadvantages such as difficult secondary treatment, easy to cause secondary environmental pollution, low treatment efficiency, and high treatment cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0023] Prepare the improved Montina inorganic phosphorus bacteria culture medium, the main component is 5-10 g glucose (C 6 h 12 o 6 ), 0.3-0.5 g ammonium sulfate [(NH 4 ) 2 SO 4 ], 0.2-0.3 g sodium chloride (NaCl), 0.2-0.3 g magnesium sulfate (MgSO 4 ·7H 2 O), 0.02-0.03 g ferrous sulfate (FeSO 4 ), 0.02-0.03 g manganese sulfate (MnSO 4 ·H 2 O), 0.1-0.3 g potassium chloride (KCl), 1-10 g phosphate rock powder (phosphorus content above 3%). Add 10-15 g of Montina inorganic phosphorus bacteria culture medium per liter of U(VI) polluted water, and adjust the pH value to 6.0-8.0 with 2 mol / L NaOH and 1:1 HCl solution. Sterilize the U(VI) polluted water body added with Montina inorganic phosphorus bacteria medium at 121°C for 30 minutes, inoculate 10-50 ml / L of Aspergillus niger spore suspension with OD value of 0.05-0.2 into U (VI) In polluted water bodies. After inoculation, at 25-30°C, culture with shaking or aerobic culture. During the cultivation process, when the ...

Embodiment 1

[0027] Example 1, in 1 liter of U(VI) polluted water with a concentration of 50 mg / L, 15 g of Montina medium with a phosphate rock powder content of 2 g / L was added to adjust the pH value to 6.0. 121°C After sterilizing under high temperature for 30 min, cool to room temperature, inoculate 10 ml of Aspergillus niger spore suspension with OD value of 0.1, and incubate at 25 °C for 96 h. At this time, the concentration of U(VI) in the polluted water dropped to 0.042 mg / L, and the pH value dropped to 4.1. After filtering with qualitative filter paper, use saturated lime milk solution to adjust the pH value of the filtrate to 7.0 before discharging.

Embodiment 2

[0028] Example 2, in 1 liter of U(VI) polluted water with a concentration of 1 mg / L, 13 g of Montina medium with a phosphate rock powder content of 2 g / L was added to adjust the pH value to 6.0. 121°C After sterilizing for 30 min, cool to room temperature, inoculate 10 ml of Aspergillus niger spore suspension with an OD value of 0.1, and incubate at 25 °C for 84 h. At this time, the concentration of U(VI) in the polluted water dropped to 0.036 mg / L, and the pH value dropped to 4.5. After filtering with qualitative filter paper, use saturated lime milk solution to adjust the pH value of the filtrate to 7.0 before discharging.

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Abstract

The invention relates to a method for remedying a U (VI) polluted water body by decomposing ground phosphate rock with Aspergillus niger. The method comprises steps as follows: firstly, a Morgina culture medium taking the ground phosphate rock as an inorganic phosphorous source is added to the U (VI) polluted water body, then the pH value of the polluted water body is adjusted to range from 6.0 to 8.0, then the polluted water body is inoculated with an Aspergillus niger spore suspension for culture, citric acid and oxalic acid are produced, phosphorus in the ground phosphate rock is decomposed into phosphate radicals to be released to the U (VI) polluted water body, and the released phosphate radicals and uranyl ions in the water body have a precipitation reaction to produce (UO2)3(PO4)2*4H2O precipitate, so that the U (VI) polluted water body is remedied. The method has multiple advantages that the remediation cost is low, the remediation effect is good, secondary pollution is avoided and the like.

Description

technical field [0001] The invention relates to U(VI) polluted water bodies, in particular to the restoration of U(VI) polluted water bodies. Specifically, it is an organic acid produced by Aspergillus niger, which is used to decompose phosphate rock powder into phosphate radicals, and then used to form (UO 2 ) 3 (PO 4 ) 2 4H 2 O precipitation, thereby realizing the method for the remediation of U(VI) polluted water body. Background technique [0002] Uranium is an important nuclear fuel for national defense and nuclear power. With the rapid development of national defense and nuclear power construction, the demand for natural uranium is increasing, which makes the scale of uranium mining, uranium processing and uranium hydrometallurgy increasing, resulting in Radioactive pollution of water bodies in the surrounding environment. Although the concentration of U(VI) in such radioactively polluted water bodies is low, it has strong mobility and will eventually enter the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F101/20
Inventor 丁德馨胡南李世汩李科李殿鑫王永东赵维超李乐李广悦
Owner NANHUA UNIV