Biomineralization-based acidic mine wastewater treatment system and treatment method

An acid mine wastewater, biological mineralization technology, applied in mining wastewater treatment, biological water/sewage treatment, multi-stage water treatment, etc. volume reduction effect

Active Publication Date: 2016-05-25
SHANXI AGRI UNIV +1
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Problems solved by technology

In order to solve the problems of slow ferrous oxidation rate, low synthesis of secondary iron minerals, and useless discharge of neutralized and precipitated toxic residues in the process of acid mine wastewater treatment

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  • Biomineralization-based acidic mine wastewater treatment system and treatment method

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Embodiment Construction

[0028] In order to enable those skilled in the art to better understand that the technical solutions of the present invention can be implemented, the present invention will be further described below in conjunction with the accompanying drawings and specific examples, but the given examples are not intended to limit the present invention.

[0029] Acid mine wastewater is a type of extremely strong acid formed during the mining and utilization of coal mines and various metal mines, with a pH of 2.0 to 3.5, rich in Fe and SO 4 2- and a variety of heavy (class) metal ions Cu, As, etc.; Fe present in the liquid phase system in acidic mine wastewater 3+ Can greatly increase the amount of lime needed for neutralization. Therefore, in order to reduce the subsequent lime consumption, the system Fe 3+ Secondary iron minerals are biosynthesized under the action of microorganisms, and the pH of the acid mine wastewater system is usually between 2 and 3. And the neutralization residue ...

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Abstract

The invention provides a biomineralization-based acidic mine wastewater treatment system which comprises a water inlet end, a regulation unit, a biological oxidation mineralization unit, a lime neutralization unit, a lime dissolution unit, a neutralization residue reflux unit and a water outlet end. After the pH value of the acidic mine wastewater is regulated to 3.0, the acidic mine wastewater sequentially enters the biological oxidation mineralization unit and the lime neutralization unit to be treated, thereby reaching the discharge standard. By using the system and method provided by the invention, Fe<2+> in the acidic mine wastewater system can be completely oxidated within 48-60 hours, and meanwhile, the synthetic quantity of the secondary iron minerals can be enhanced by 30-60%. Compared with the conventional lime neutralization technique, the lime consumption is reduced by 30-50%.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to an acid mine wastewater treatment system and treatment method based on biomineralization. Background technique [0002] Acid mine wastewater (AMD) is a kind of extremely acidic (pH2. 4 2- and a variety of heavy (class) metal ions (Cu, As, etc.), its effective treatment has become one of the key issues in the comprehensive management of the ecological environment in mining areas. At present, the treatment methods of AMD include neutralization method, sulfide precipitation flotation method, artificial wetland method, sulfate reducing bacteria method, etc. However, due to the wide source of lime and low price, lime neutralization is still the most commonly used AMD treatment method in the world, and its engineering utilization rate reaches more than 90%. When lime neutralizes the acid mine wastewater system at a pH of about 7, the Fe of the system 2+ Can not be completely oxidiz...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10
CPCC02F1/66C02F3/02C02F3/346C02F2301/046C02F2301/08
Inventor 刘奋武周立祥樊文华秦俊梅
Owner SHANXI AGRI UNIV
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