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Preparation method of Schweetmannite based on ZVI reduction coupling microorganisms

A technology of Shi's minerals and microorganisms, applied in the field of environmental engineering, can solve the problems of low amount of synthetic minerals in shake flask batches, low total iron precipitation rate, low iron precipitation rate and low amount of synthetic minerals, etc., so as to improve the total iron precipitation rate. , The effect of increasing the amount of mineral synthesis and avoiding the consumption of a lot of human and material resources

Active Publication Date: 2019-06-25
NANJING AGRICULTURAL UNIVERSITY
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Problems solved by technology

However, regardless of the chemical method or the biological method, the iron precipitation rate and the amount of synthetic minerals when the final stability is reached during the synthesis process using the shake flask method in the laboratory are relatively low, which can only reach 43.1%, 36.7% and 4g respectively. / L, 3.2g / L, with a lot of Fe 3+ Mineral formation has not been utilized, and there are defects of low total iron precipitation rate and low amount of synthetic minerals in shake flask batches
[0004] As mentioned above, the environmental significance of Shi's minerals is very obvious, but there is no 3+ A Continuous Production Method Related to Utilization Rate and Synthetic Efficiency of Schwartz Minerals

Method used

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  • Preparation method of Schweetmannite based on ZVI reduction coupling microorganisms
  • Preparation method of Schweetmannite based on ZVI reduction coupling microorganisms
  • Preparation method of Schweetmannite based on ZVI reduction coupling microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Prepare Shi's mineral under the condition of HRT=1.5 days:

[0045] The purchased A.ferrooxidans LX5 (Chinese patent: 02112924.X) was inoculated in the improved 9K medium (composition: (NH 4 ) 2 SO 4 3.5g / L, KCI 0.119g / L, K 2 HPO 4 0.058g / L (or K 2 HPO 4 ·3H 2 (00.076g / L), MgSO 4 ·7H 2 O 0.583g / L, Ca(NO 3 ) 2 4H 2 O 0.0168g / L, energy substance FeSO 4 ·7H 2 044.2g / L), use 1:1H 2 SO 4 Adjust the pH to 2.5, keep the total volume of the system at 3 L, place in a reciprocating shaker with a rotation speed of 180 r / min, and a temperature of 28° C. for 3 days. Place the bacterium solution after 3 days of expansion in container 1 (what this example adopts is a 3L beaker), add 22.24g / L FeSO 4 ·7H 2 0 and stir until it is completely dissolved, then continue to aerate and oxidize under the condition that the dissolved oxygen concentration is not lower than 6mg / L. When Fe in container 1 2+ After being fully oxidized by aeration, the mixed solution was continuou...

Embodiment 2

[0047] Prepare Shi's mineral under the condition of HRT=3 days:

[0048] A.ferrooxidans LX5 was inoculated in the improved 9K medium with 10% ratio (composition: (NH 4 ) 2 SO 4 3.5g / L, KCI 0.119g / L, K 2 HPO 4 0.058g / L (or K 2 HPO 4 ·3H 2 O 0.076g / L), MgSO 4 ·7H 2 O0.583g / L, Ca(NO 3 ) 2 4H 2 O 0.0168g / L, energy substance FeSO 4 ·7H 2 0 44.2g / L), with 1:1H 2 SO 4 Adjust the pH to 2.5, keep the total volume of the system at 3 L, place in a reciprocating shaker with a rotation speed of 180 r / min, and a temperature of 28° C. for 3 days. Place the bacterium solution after 3 days of expansion in container 1 (what this example adopts is a 3L beaker), add 22.24g / L FeSO 4 ·7H 2 0 and stir until it is completely dissolved, then continue to aerate and oxidize under the condition that the dissolved oxygen concentration is not lower than 6mg / L. When Fe in container 1 2+ After being fully oxidized by aeration, the mixed solution was continuously flowed into another contai...

Embodiment 3

[0050] Prepare Shi's mineral under the condition of HRT=4.5 days:

[0051] A.ferrooxidans LX5 was inoculated in the improved 9K medium with 10% ratio (composition: (NH 4 ) 2 SO 4 3.5g / L, KCI 0.119g / L, K 2 HPO 4 0.058g / L (or K 2 HPO 4 ·3H 2 O 0.076g / L), MgSO 4 ·7H 2 O0.583g / L, Ca(NO 3 ) 2 4H 2 O 0.0168g / L, energy substance FeSO 4 ·7H 2 0 44.2g / L), with 1:1H 2 SO 4 Adjust the pH to 2.5, keep the total volume of the system at 3 L, place in a reciprocating shaker with a rotation speed of 180 r / min, and a temperature of 28° C. for 3 days. Place the bacterial solution after 3 days of expansion into container 1, add 22.24g / L FeSO 4 ·7H 2 0 and stir until it is completely dissolved, then continue to aerate and oxidize under the condition that the dissolved oxygen concentration is not lower than 6mg / L. When Fe in container 1 2+ After being fully oxidized by aeration, the mixed solution was continuously flowed into another container 2 at a flow rate of 0.46mL / min, an...

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Abstract

The invention discloses a preparation method of Schweetmannite based on ZVI reduction coupling microorganisms, and the method comprises the following steps: (1) mixing a bacterial liquid obtained by strain cultivation with FeSO4.7H20, stirring and dissolving to obtain a mixed liquid; (2) aerating and oxygenating the mixed liquid obtained in the step (1) in a vessel 1 until Fe<2+> is completely oxidized to Fe<3+>, transferring a part of the mixed liquid to another vessel 2, and adding ZVI for mixing and stirring for performing Fe<3+> reduction; (3) after Fe<3+> reduction for a certain period oftime in the step (2), performing solid-liquid separation on the ZVI and a reduced liquid mixture, and transferring the separated liquid mixture back to the vessel 1 for aeration and oxygenation; and(4) performing circulation according to the steps (2) and (3) until total iron TFe in the whole system precipitates completely, collecting by filtration a mineral synthesized in the vessel 1, washingwith water and drying the mineral to obtain the Schweetmannite. The method not only improves the iron utilization rate and the total iron precipitation rate, but also continuously produces the Schweetmannite.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and in particular relates to a method for efficiently preparing Schwittmannite minerals based on a zero-valent iron (ZVI) reduction coupling biological method. Background technique [0002] Schwittmannite mineral (referred to as Schweeter's mineral) is a secondary hydroxysulfate ferric mineral with strong surface group activity and special morphology. It is widely found in acidic mine wastewater and acidic sulfate soil. in an acidic environment. Shi's minerals have a strong adsorption capacity for toxic and harmful substances such as heavy metals and polycyclic aromatic hydrocarbons in the environment. The adsorption capacity of biosynthesized Shi's minerals to As(III) was as high as 113.9mg / g, and the maximum adsorption capacity to Cr(VI) was as high as 55mg / g, and the competing anions and ionic strength had little effect on the adsorption efficiency. Compared with chemical sedimentati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C12P3/00C02F101/34C02F101/38C02F101/20C02F101/30
Inventor 郑冠宇王电站周立祥黄旭旦
Owner NANJING AGRICULTURAL UNIVERSITY
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