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A method for bacterial solidification of tailings and control of heavy metal leaching

A technology of heavy metals and bacteria, applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of heavy metal dissolution and pollution of the environment, and achieve the effects of heavy metal pollution control, low treatment cost and good environmental benefits

Inactive Publication Date: 2017-01-25
XINJIANG INST OF ECOLOGY & GEOGRAPHY CHINESE ACAD OF SCI
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Problems solved by technology

However, if it encounters suitable environmental conditions, heavy metals will dissolve again and pollute the environment

Method used

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  • A method for bacterial solidification of tailings and control of heavy metal leaching

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Embodiment Construction

[0013] The tailings slag selected in the inventive method is the chromium slag in Lianggou Village, Qianqiu Township, Yima City, Henan Province:

[0014] Bacteria source and culture: The selected bacteria is Bacillus asahii, and the strain is from China Microbial Strain Network (CCTCC AB 207736). NBU medium is used to enrich the strain. NBU medium is NB medium Add 2%-6% urea and 20-30mmol CaCl 2 , shake culture at 25-35°C until the bacterial concentration is 5×10 7 More than CFU / ml, the shaking speed is 100-150 rpm, and the time is 24-72 hours;

[0015] Solidification treatment: mix chromium slag, sand and soil at a mass ratio of 7-8:1.5-2.0:0.8-1.2, add 8%-13% (V / W) to enrich and cultivate the cultured bacteria solution, and the temperature is 25-35°C After curing for 3-5 weeks, the bacterial solution releases carbon dioxide during the metabolism of urea and makes the pH of the environment rise to become alkaline. Under alkaline conditions, carbon dioxide and Ca are promote...

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Abstract

The invention relates to a method for curing tailings by bacteria and controlling heavy metal leaching. The method comprises the following steps: performing enrichment culture on a bacterial strain with a preservation number of CCTCC AB 207736, which is purchased from China Network of Microbiological Culture, by utilizing bacillus asahii and adopting an NBU liquid culture medium; inducing Ca<2+> in the environment to form precipitates in an alkaline environment through CO2 produced in a process of decomposing urea by a bacterial solution, embedding heavy metals in crystal lattices of the precipitates in a CaCO3 forming process to achieve the purpose of curing the heavy metals in the tailings. Meanwhile, a slag brick formed after curing has a strength equivalent to that of a baking-free brick, so that resource recycling is realized. The method is low in treatment cost, good in environmental benefit and free of secondary pollution; the slag brick formed after curing has a certain recycling value and can be used for fixing various heavy metals.

Description

[0001] Technical field: [0002] The invention specifically relates to a method for bacteria solidifying tailings and controlling heavy metal leaching, which is a method for urea-decomposing bacteria to induce calcium carbonate precipitation to fix heavy metals in tailings, and belongs to the field of environmental protection. Background technique [0003] With the rapid development of the national economy, the market demand for various ores is increasing, and the slag after beneficiation is also increasing. Except for a very small number of mining areas that handle and control the slag reasonably, most of the rest are piled up everywhere. Due to the lack of effective pollution control methods and anti-seepage measures in places where slag is piled up, sand and dust are everywhere in windy weather, and when encountering heavy rain, sediment pours down, encroaching on farmland, polluting water sources, and causing damage to the local ecological environment. serious hazard. In...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00C04B18/12
CPCY02W30/91
Inventor 潘响亮李保华宋文娟张道勇
Owner XINJIANG INST OF ECOLOGY & GEOGRAPHY CHINESE ACAD OF SCI
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