Facultative anaerobic denitrifying bacterium with self-flocculation capability and purpose thereof

Abstract

The invention discloses a facultative anaerobic denitrifying bacterium with self-flocculation capability. The bacterial strain is named as Pseudomonas stutzeri LZ-4 and belongs to pseudomonas stutzeri strain, and the preservation number is CCTCCM 2011430. The bacterial strain provided by the invention can be applied to the denitriding of waste water, and the optimal denitriding temperature of the bacterial strain is 20-35 DEG C. The bacterial strain adapts to a wide pH value range which is between pH 6 and pH 11. When a C / N (mol / mol) ratio is more than or equal to 3, the denitriding rate of the bacterial strain is up to above 90%. In a slight oxygen solution environmental condition, the denitriding activity of the bacterial strain is highest. Final product gas of denitrification is authenticated as nitrogen, and inorganic nitrogen such as nitrate nitrogen, nitrite nitrogen and the like in a water body can be directly reduced into the harmless nitrogen to be discharged outside the water body. By using the bacterial strain, at a later period when a denitrification role is played, the aggregation and the formation of a flocculating constituent are started, and the flocculating constituent is precipitated at the bottom of the waste water. Through contrasting the performance detection of the bacterial strain, the following effects that a process of treating nitrogen-containing waste water by using the bacterial strain is simple, a treatment effect is efficient and stable, further, greenhouse gases such as NO and N2O cannot be generated, and the air pollution cannot be caused can be realized.

Description

technical field [0001] The invention relates to a facultative anaerobic denitrification bacterium with self-flocculation ability and application thereof, belonging to the field of environmental microorganisms. Background technique [0002] With the development of industrial and agricultural production and the improvement of people's living standards, the discharge of nitrogen-containing pollutants in my country has increased rapidly, large and small water bodies have become "shelters" for these pollutants, and the quality of water bodies has deteriorated sharply. At present, a large number of wastewater biological treatment projects have been established all over the country, effectively curbing the continuous deterioration of water pollution. However, the nitrogen content of the discharged water after the secondary treatment of sewage is still high, which seems to be a serious source of environmental pollution. Ammonia nitrogen and nitrate nitrogen are the main forms of ni...

AI Technical Summary

Problems solved by technology

However, due to the lack of flocculation bacteria in the AGS system, it takes a long time to form granular sludge. For example, it takes 1.5 to 3 months to cultivate AGS in the SBAR reactor, which greatly limits the application of AGS.

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