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Process for treating polluted groundwater of retired mining area of acid in-situ leaching uranium mine by using microbial method

A technology for in-situ leaching of uranium and microorganisms, applied in biological water/sewage treatment, water pollutants, mining wastewater treatment, etc.

Inactive Publication Date: 2010-07-07
NANHUA UNIV +1
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the high cost of physical and chemical methods and the immature technology, it is difficult for enterprises to bear it. So far, no technical and economically feasible treatment methods have been found, and the polluted mining areas that have been shut down for many years have not yet started treatment.

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  • Process for treating polluted groundwater of retired mining area of acid in-situ leaching uranium mine by using microbial method
  • Process for treating polluted groundwater of retired mining area of acid in-situ leaching uranium mine by using microbial method

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Embodiment Construction

[0015] The composition characteristics of the polluted groundwater in the decommissioned mining area are as follows: the pH value is about 2, and the main pollution components are uranium, sulfate, nitrate and heavy metal ions. After the polluted groundwater is pumped out of the surface, the uranium is removed and recovered by ion exchange resin adsorption, and then the H is neutralized. + , adjust the pH value of the solution to about 7, remove part of the sulfate and heavy metal ions, and finally process the nitrate and the remaining sulfate and heavy metal ions through the joint treatment of DNB and SRB bioreactors.

[0016] The content of the main polluting element before the treatment of the decommissioned mining area of ​​an in-situ leaching uranium mine polluted groundwater was SO 4 2- : 13~15g.L -1 ;NO 3 - : 0.5~0.7g.L -1 ; U: 5 ~ 10mg.L -1 ;Pb 2+ : 0.2~0.5mg.L -1 ; Zn 2+ : 2~5mg.L -1 ;Cr 3+ : 0.2~0.5mg.L -1 ; 2+ : 2~5mg.L -1 . After using the above sche...

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Abstract

The invention relates to a process for treating polluted groundwater of a retired mining area of an acid in-situ leaching uranium mine by using a microbial method. The process comprises the follow steps of: pumping the polluted groundwater of the retired mining area from draw holes, carrying out exchange adsorption to process uranium by using ion exchange resin, regulating the pH value of sewage solution to 7 approximately, allowing clear solution to enter a DNB bioreactor first, and reducing nitrate in the solution with DNB, wherein the removal rate of the nitrate is over 95 percent; and secondly, degrading sulfate and removing heavy metal ions of the solution in which the nitrate is degraded with a SRB bioreactor. The removal rate of the nitrate of the processed polluted groundwater is over 95 percent; the removal rate of the sulfate is between 60 and 70 percent, and the removal rate of the heavy metal ions is over 85 percent.

Description

technical field [0001] The invention proposes a new combined treatment process of DNB and SRB microorganisms aiming at the difficult-to-treat characteristics of main pollutants such as nitrate, sulfate, uranium and heavy metal ions polluted in decommissioned mining areas of uranium mines by acid in-situ leaching. Background technique [0002] After nearly 20 years of research and application of acid in-situ leaching uranium mining technology in China, its production scale and mining technology have been developed rapidly. There are four in-situ leaching uranium mines currently in production and operation in my country, all of which are acid methods; reagentless leaching (that is, adding CO 2 and O 2 ) process industry application is under construction; neutral in-situ leaching and alkaline in-situ leaching for uranium mining are still in the test process. There are both acid method and alkali method in foreign countries. Different processes are adopted according to the bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/34C02F1/66C02F1/42C02F103/10C02F101/16C02F101/20C02F101/10
Inventor 丁德馨王清良胡鄂明张国奇阳奕汉蒋小辉徐屹群
Owner NANHUA UNIV
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