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Method for efficiently reducing hexavalent chromium in water and recovering chromium through waste molasses and bacteria

A technology of hexavalent chromium and bacteria, applied in chemical instruments and methods, methods based on microorganisms, biochemical equipment and methods, etc., can solve the problems of low reduction efficiency and long time consumption, and achieve the effect of resource utilization

Active Publication Date: 2019-10-15
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that the microbial reduction process has shortcomings such as time-consuming, bacteria are difficult to survive and reproduce at low pH values ​​or in complex systems, resulting in low reduction efficiency.
In addition, studies have also shown that in the process of biological reproduction and action, it is often necessary to provide stricter nutrient sources, including carbon sources, nitrogen sources and inorganic salts, which also bring a certain cost to the treatment.

Method used

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  • Method for efficiently reducing hexavalent chromium in water and recovering chromium through waste molasses and bacteria
  • Method for efficiently reducing hexavalent chromium in water and recovering chromium through waste molasses and bacteria
  • Method for efficiently reducing hexavalent chromium in water and recovering chromium through waste molasses and bacteria

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Such as figure 1 As shown in the operation flow chart: use potassium chromate solid and deionized water to prepare 30.0mg / L Cr(VI)-containing simulated wastewater, take 150mL of the above-mentioned Cr(VI)-containing simulated wastewater, add waste molasses and (NH 4 ) 2 Fe(SO4) 2 ·6H 2 O, make the waste molasses concentration be 2.5g / L, (NH 4 ) 2 Fe(SO4) 2 ·6H 2 The concentration of O was 0.5g / L; the pH value of the system was adjusted to 7.5 to obtain a mixed solution.

[0056] Then inoculate the bacterial SL bacterial liquid, the bacterial SL concentration in it is 10 10 CFU / mL, the inoculum size is 3w%, and then pass N 2 15min, sealed, and placed in a constant temperature incubator at 35°C for 80h. In the middle, after standing for 25 hours, measure the reduction rate of Cr(VI) in the solution. After standing for 80 hours, a large amount of precipitation occurs in the system. The precipitate is filtered and the total chromium content of the filtrate is measu...

Embodiment 2

[0074] Such as figure 1 As shown in the operation flow chart: use potassium chromate solid to prepare 70.0mg / L Cr(VI)-containing simulated wastewater, take 150mL of the above-mentioned Cr(VI)-containing simulated wastewater, add waste molasses and (NH 4 ) 2 Fe(SO4) 2 ·6H 2 O, make the waste molasses concentration be 2.5g / L, (NH 4 ) 2 Fe(SO4) 2 ·6H 2 The concentration of O was 0.5g / L; the pH value of the system was adjusted to 3.0 to obtain a mixed solution. Bacteria SL bacterium liquid (concentration is the same as embodiment 1) inoculum size is 6w%, logical N then 2 15min, sealed, and placed in a constant temperature incubator at 35°C for 100h. In the middle, the reduction rate of Cr(VI) in the solution was measured after standing for 30 hours. After standing for 100 hours, a large amount of precipitation appeared in the system. The precipitate was filtered and the total chromium content of the filtrate was measured by atomic absorption spectrometer.

[0075] Harmful...

Embodiment 3

[0084] Such as figure 1 As shown in the operation flow chart: use potassium chromate solid to prepare 100.0mg / L Cr(VI)-containing simulated wastewater, take 150mL of Cr(VI)-containing simulated wastewater, add waste molasses and (NH 4 ) 2 Fe(SO4) 2 ·6H 2 O, make the waste molasses concentration be 2.5g / L, (NH 4 ) 2 Fe(SO4) 2 ·6H 2 The concentration of O was 0.5g / L; the pH value of the system was adjusted to 10.0 to obtain a mixed solution. Bacteria SL bacterium liquid (concentration is the same as embodiment 1) inoculum size is 10w%, logical N then 2 15min, sealed, and placed in a constant temperature incubator at 45°C for 120h. In the middle, the reduction rate of Cr(VI) in the solution was measured after standing for 40 hours. After standing for 120 hours, a large amount of precipitation appeared in the system. The precipitate was filtered and the total chromium content of the filtrate was measured by atomic absorption spectrometer.

[0085] Harmful components (Cr(V...

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Abstract

The invention relates to the technical field of harmless treatment on waste water containing hexavalent chromium, and particularly relates to autonomously domesticated bacteria SL, in particular to amethod by using waste molasses and bacteria to efficiently reduce the hexavalent chromium in the water and recover the chromium. The invention firstly discloses the bacteria SL. The bacteria SL are preserved in a typical culture preservation center in China, the preservation date is December 12, 2018, and the preservation number is CCTCC NO: M 2018892. The invention further discloses application of the autonomously domesticated bacteria SL. The invention finally further discloses the method by using the bacteria SL to efficiently reduce the hexavalent chromium in the water to trivalent chromium under the action of the waste molasses and recover the total chromium. The method has the advantages of being low in treatment cost, simple in operation condition and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of wastewater containing hexavalent chromium, in particular to a self-domesticated bacterium SL, and in particular to a method for efficiently reducing hexavalent chromium in water and recovering chromium by using waste molasses and bacteria. Background technique [0002] Chromium (Cr) is widely used in leather, electroplating, printing and dyeing industries, and a large amount of Cr(VI)-containing wastewater is also produced. Due to its huge biological toxicity and strong mobility in natural water bodies, it has caused more and more serious environmental hazards. Therefore, chromium-containing pollutants are priority pollutants controlled by EPA and my country. However, trivalent chromium (Cr(III)) has the characteristics of low toxicity, easy formation of precipitation and relatively stable in natural water environment. Therefore, the more effective treatment method for Cr(VI)-conta...

Claims

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Application Information

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IPC IPC(8): C12N1/20C02F3/34C22B7/00C22B34/32C12R1/01C02F101/22
CPCC02F3/34C02F2101/22C02F2305/06C12N1/20C22B7/006C22B34/32C12N1/205C12R2001/01Y02P10/20
Inventor 杜冬云孙燕蓝际荣杜亚光郭莉叶恒朋
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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