Method for treating total nitrogen in coking wastewater by utilizing microorganisms

Abstract

The invention discloses a method for treating total nitrogen in coking wastewater by utilizing microorganisms. Wastewater enters a pre-aeration tank before entering a secondary biochemical system to be subjected to nitrification and denitrification, wherein plenty of COD (Chemical Oxygen Demand), volatile phenols and cyanides are removed by the pre-aeration tank; the secondary biochemical system comprises an Anammox tank, a facultative tank and an aerobic tank; the Anammox tank can be used for carrying out anaerobic ammonium oxidation, the facultative tank is used for carrying out denitrification; the aerobic tank is used for carrying out nitrification; and microorganism carriers accounting for 1.0-2.5% of the volumes of the three tanks and microorganism preparations accounting for 1.5-4.0% of the volumes of the three tanks are added to the three tanks respectively in advance. After the coking wastewater is treated by the method, ammonia nitrogen in the coking wastewater can be controlled below 15mg / L, the COD can be controlled below 100mg / L and other indexes can reach the country-level discharge standard. The method disclosed by the invention is also suitable for treating industrial wastewater and domestic wastewater besides the coking wastewater.

Description

technical field [0001] The invention belongs to the technical field of biochemistry and environmental protection, and mainly relates to a method for treating total nitrogen of coking wastewater by using microorganisms. technical background [0002] The coking wastewater produced by the factory is a large amount of wastewater with complex components and high concentration produced during the coking production process. Pollutants contained in coking wastewater include phenols, polycyclic aromatic compounds, and heterocyclic compounds containing nitrogen, oxygen, and sulfur, etc. It is a typical industrial wastewater containing refractory organic compounds. The water quality of ammonia distillation wastewater in general coking plants is as follows: COD Cr 2000~10000 mg / L, phenol 100~900mg / L, cyanide 10~50mg / L, oil 50~200mg / L, ammonia nitrogen 100~700mg / L, it is a kind of refractory industrial wastewater with high COD and high ammonia nitrogen. [0003] The current wastewater...

AI Technical Summary

Problems solved by technology

In addition, no matter in any of the above cases, the sedimentation tank in the sedimentation tank following the aerobic tank in layout must also contain a large amount of NO 3 - or NO 2 - , when the mud is discharged, it will also indirectly cause NO 3 - or NO 2 - pollution to the environment

[0006] Undoubtedly, the classic A / O denitrification process will be unable to cope with the increasingly stringent emission standards due to the limitations of its own process layout settings and unfavorable control during denitrification operation.

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