Applications and use method of molybdenum disulfide in nitrate nitrogen sewage treatment

A molybdenum disulfide and sewage treatment technology, which is applied in the fields of chemical engineering, biological engineering and environmental engineering, can solve the problems of secondary water pollution, prolonged sewage residence time and high operating cost, and achieves the promotion of microbial growth, the best sewage treatment effect, The effect of shortening the reaction time

Active Publication Date: 2020-02-21
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, on the one hand, the denitrification rate of denitrifying bacteria is slow due to electron transfer, resulting in a long time for biochemical denitrification; on the other hand, due to the low proportion of denitrifying bacteria in activated sludge (about 20%), the activity The ability of sludge to denitrify is low. These two reasons lead to a prolonged residence time of sewage and a corresponding increase in operating costs.
[0003] Redox mediators can speed up the denitrification rate of denitrifying bacteria, but continuous addition of redox mediators is required to maintain the degradation activity of microorganisms, which will cause secondary pollution of water bodies, and the loss of redox mediators will also lead to higher operating costs
Although the immobilization of redox mediators can solve the problem of redox mediator loss and secondary pollution of water bodies, its preparation process is complicated and the price is relatively expensive, so far it cannot be applied in water treatment.

Method used

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  • Applications and use method of molybdenum disulfide in nitrate nitrogen sewage treatment
  • Applications and use method of molybdenum disulfide in nitrate nitrogen sewage treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] S1: Add 5 mg of molybdenum disulfide with an average particle size of 1 μm to 1000 mL of sewage (sodium nitrate 200 mg / L, C / N=3, MLSS=1 g / L, dissolved oxygen=0 mg / L) (sludge from Shijiazhuang Return sludge from Qiaoxi Sewage Treatment Plant; the concentration of sodium nitrate is calculated as nitrogen element);

[0037] S2: Add 0 g of glucose to the liquid obtained in step S1, and stir evenly;

[0038] S3: reacting the liquid obtained in step S2 at 15°C;

[0039] S4: Measure the concentration of total nitrogen every 1 hour. After 9 hours, the concentration of total nitrogen in the aqueous solution of step S3 is 5.3 mg / L.

Embodiment 2

[0043] S1: Add 5g of molybdenum disulfide with an average particle size of 1μm to 1000mL sewage (sodium nitrite 200mg / L, C / N=20, MLSS=1.5g / L, dissolved oxygen=2mg / L) (sludge Return sludge from Shijiazhuang Qiaodong Sewage Treatment Plant; the concentration of sodium nitrite is calculated by nitrogen);

[0044] S2: Add 0 g of glucose to the liquid obtained in step S1, and stir evenly;

[0045] S3: reacting the liquid obtained in step S2 at 42°C;

[0046] S4: Measure the concentration of total nitrogen every 1 hour. After 7 hours, the concentration of total nitrogen in the aqueous solution of step S3 is 8.9 mg / L.

Embodiment 3

[0050] S1: Add 5 mg of molybdenum disulfide with an average particle size of 500 μm to 1000 mL of sewage (ammonium nitrate 200 mg / L, C / N=1, MLSS=1.3 g / L, dissolved oxygen=1 mg / L) (sludge from The return sludge of the sewage treatment workshop of Cangzhou Xuyang Chemical Co., Ltd.; the concentration of nitrate nitrogen is calculated as nitrogen element);

[0051] S2: Add 0.6 g of glucose to the liquid obtained in step S1, and stir evenly;

[0052] S3: reacting the liquid obtained in step S2 at 35°C;

[0053] S4: Measure the concentration of total nitrogen every 2 hours. After 6 hours, the concentration of nitrate nitrogen in the aqueous solution of step S3 is 1.8 mg / L.

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Abstract

The invention discloses applications and a use method of molybdenum disulfide in nitrate nitrogen sewage treatment, and belongs to the field of chemical engineering, bioengineering and environmental engineering, wherein the nitrate nitrogen sewage contains a predetermined amount of active sludge, and the molybdenum disulfide is used for changing the flora structure of the active sludge in the nitrate nitrogen sewage. The use method comprises: S1, adding molybdenum disulfide into nitrate nitrogen sewage containing a predetermined amount of active sludge to obtain a mixed liquid; S2, adding a carbon source into the mixed liquid, and uniformly stirring to form a middle liquid; S3, reacting the middle liquid at a certain temperature; and S4, analyzing the concentration of the total nitrogen inthe aqueous solution in the step S3. According to the invention, by adding the molybdenum disulfide into the nitrate nitrogen sewage, the speed of the removal of the nitrate and the nitrite in the nitrate nitrogen sewage by the active sludge is increased so as to shorten the reaction time and reduce the operation cost, so that the method has good application prospect in the field of nitrogen-containing sewage treatment by biochemical methods.

Description

technical field [0001] The invention relates to molybdenum disulfide, in particular to the application and use method of molybdenum disulfide in nitrate nitrogen sewage treatment, and belongs to the fields of chemical engineering, biological engineering and environmental engineering. Background technique [0002] With the rapid development of industry and agriculture, a large amount of nitrate and nitrite are discharged into the natural environment, causing eutrophication of water body, deterioration of water quality, and serious environmental pollution. At present, biochemical method is the main method to remove nitrate and nitrite in sewage. The denitrifying bacteria in activated sludge convert nitrate nitrogen and nitrite nitrogen into nitrogen gas through denitrification reaction to realize the removal of nitrate. . However, on the one hand, the denitrification rate of denitrifying bacteria is slow due to electron transfer, resulting in a long time for biochemical denit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/16
CPCC02F3/2806C02F2101/163C02F2101/166
Inventor 李军章彭兆洲胡瑞阳高开元刘守信
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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