A kind of application and using method of molybdenum disulfide in nitrate nitrogen sewage treatment

A molybdenum disulfide and sewage treatment technology, applied in the fields of biological engineering, environmental engineering, and chemical engineering, can solve the problems of high operating cost, complicated preparation process, and loss of redox mediators, so as to reduce operating cost and facilitate popularization and application. The effect of shortening the reaction time

Active Publication Date: 2022-04-01
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • 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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  • A kind of application and using method of molybdenum disulfide in nitrate nitrogen sewage treatment
  • A kind of application and using 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 an application and usage method of molybdenum disulfide in the treatment of nitrate nitrogen sewage, which belongs to the fields of chemical engineering, biological engineering and environmental engineering. The nitrate nitrogen sewage contains a predetermined amount of activated sludge, wherein the molybdenum disulfide Molybdenum sulfide was used to change the bacterial flora structure of activated sludge in nitrate nitrogen sewage. The above method of use includes the following steps: S1: adding molybdenum disulfide to the nitrate nitrogen sewage containing a predetermined amount of activated sludge to obtain a mixed liquid; S2: adding a carbon source to the mixed liquid, stirring evenly to form an intermediate liquid; S3 : reacting the intermediate liquid at a certain temperature; S4: analyzing the concentration of total nitrogen in the aqueous solution of step S3. The invention speeds up the removal of nitrate and nitrite in the nitrate nitrogen sewage by the activated sludge by adding molybdenum disulfide in the nitrate nitrogen sewage, so as to shorten the reaction time and reduce the operation cost, and the nitrogenous sewage is treated by the biochemical method. The field has a good application prospect.

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 Patents(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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