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Method for high-efficiency precipitation of soluble iron in acid mine drainage

A technology of acid mine wastewater and high-efficiency precipitation, which is applied in the field of environmental engineering, can solve the problems of retention and low precipitation rate of soluble iron, and achieve the effects of strong adsorption capacity, good filtration and dehydration performance, good sedimentation and compactness

Inactive Publication Date: 2014-07-09
NANJING AGRICULTURAL UNIVERSITY
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Problems solved by technology

However, although Fe 2+ Under the action of A.f. bacteria, it can be completely oxidized in a short time, but even under the premise of adding 9K medium, there is only about 40% Fe after 72 hours of cultivation 3+ Formation of secondary mineral precipitation, still about 60% Fe 3+ stuck in acidic water
It can be seen that the precipitation rate of soluble iron in acid mine wastewater in natural environment is lower

Method used

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  • Method for high-efficiency precipitation of soluble iron in acid mine drainage
  • Method for high-efficiency precipitation of soluble iron in acid mine drainage
  • Method for high-efficiency precipitation of soluble iron in acid mine drainage

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Embodiment Construction

[0022] Examples of the present invention are described below.

[0023] 1. Preparation of A.f. concentrated bacterial solution:

[0024] A.f. bacteria were inoculated in 9K liquid medium, placed on a reciprocating shaker at 28°C, shaken at 180r / min, and stopped after 72 hours. Use 0.45μm medium-speed qualitative filter paper to filter the culture solution to remove minerals, centrifuge the filtrate at 10000r / min to collect the bacteria, wash the bacteria with pH=1.5 deionized water for 3 times, remove various soluble metal ions, and finally use Suspend the bacteria in deionized water at pH=2.5, and measure the bacterial density in the suspension by the double-layer plate method to be about 6×10 8 cells / mL.

[0025] 2. Electrolytic reduction of Fe 3+

[0026] Fix two carbon rods (length 10cm, diameter 0.5cm) vertically on the two ends of the inner wall of the 500ml beaker with adhesive tape so that they are on the same diameter, and the lower ends of the carbon rods are in c...

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Abstract

The invention relates to a method for high-efficiency precipitation of soluble iron in acid mine drainage, belonging to the field of environment engineering technology. The method comprises the following steps: electrolyzing acid mine drainage rich in iron ions at a low voltage and allowing most trivalent iron ions to be reduced into divalent iron ions through gain and loss of electrons; and then oxidizing divalent iron ions by using acidithiobacillus ferrooxidans so as to produce a ferric hydroxysulfate mineral with good settleability and compact particles. After secondary reduction and secondary mineral formation, the total iron precipitation rate is increased to almost 80%. The method promotes removal of soluble iron and does not introduce other chemical components, and the obtained secondary mineral has good settleability. Compared with technology of the same kind, the method provided by the invention is more superior and has the advantages of low cost, safety, reliability, energy conservation and environment friendliness, and moreover, the secondary mineral can be used as an adsorption material for resourceful utilization.

Description

1. Technical field [0001] The invention belongs to the field of environmental engineering and relates to a method for efficiently precipitating soluble iron in acid mine wastewater. 2. Technical background [0002] Acid mine drainage (AMD) refers to the sulfide minerals in the waste ore and tailings in the mining process and after mining, under the combined action of oxygen, water and microorganisms, which contain a large amount of iron ions and sulfuric acid after weathering and leaching. Acidic wastewater from roots [Liu Zhiyong et al., 2004; Feng Ying et al., 2005; Zhou Lixiang, 2008]. The pH value of AMD is low, generally 4.5-6.5, and the pH of some pyrites can be reduced to 2.5-3.0 [Hu Wenke et al., 1994; Dong Chunjuan, 2000]. [0003] According to the above characteristics of AMD, there are many treatment methods, such as artificial wetland method [Kalin et al., 2006], normal temperature ferrite method [Wei et al., 2007], sulfate reducing bacteria method [Foucher et a...

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Application Information

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IPC IPC(8): C02F9/14
Inventor 周立祥宋永伟王敏梁剑茹
Owner NANJING AGRICULTURAL UNIVERSITY
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