Trace Dissolved Oxygen Removal Using a Hydrocyclone to Enhance Denitrification

Dissolved oxygen (DO) is entrained by mixed liquid recirculation (MLR) into the anoxic basin in the pre‐denitrification biological nitrogen removal (PDBNR) process and should be removed to enhance denitrification. A laboratory‐scale PDBNR reactor with an anoxic basin divided into two isometric compo...

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Bibliographic Details
Published in:Chemical engineering & technology 2018-07, Vol.41 (7), p.1425-1432
Main Authors: Liu, Yi, Wang, Hua-lin
Format: Article
Language:English
Subjects:
Biological activity
Denitrification
Dissolved oxygen
Hydrocyclone
Hydrocyclones
Laboratories
Nitrogen removal
Pre‐denitrification biological nitrogen removal process
Wastewater treatment
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Summary:Dissolved oxygen (DO) is entrained by mixed liquid recirculation (MLR) into the anoxic basin in the pre‐denitrification biological nitrogen removal (PDBNR) process and should be removed to enhance denitrification. A laboratory‐scale PDBNR reactor with an anoxic basin divided into two isometric components was built to investigate the effect of a hydrocyclone on DO removal from the MLR and the subsequent denitrification. The denitrification rate of the mixture of influent and hydrocyclone‐treated nitrified wastewater increased with increasing DO and was higher than that of the wastewater in a conventional anoxic component. More total nitrogen was removed in the anoxic component due to the application of the hydrocyclone in the MLR of a laboratory‐scale reactor and a full‐scale anoxic/aerobic reactor. A novel separation method using a hydrocyclone was proposed for dissolved oxygen (DO) removal to enhance denitrification. The increasing intermolecular repulsion caused by the pressure gradient in radial direction of the axial sections led to DO removal in the hydrocyclone. The total nitrogen removal efficiency was increased in the anoxic/aerobic reactor assessed for refinery sewage treatment.
ISSN:0930-7516
1521-4125
DOI:10.1002/ceat.201700363