Evaluating the Effect of Nonaerobic Hydraulic Retention Time on Nutrients Removal in Nonaerobic and Aerobic SBR

AbstractThe nonaerobic stage is critical for the processes of denitrification and phosphorus release in biological wastewater treatment. A lab-scale sequencing batch reactor (SBR) operating as nonaerobic/aerobic was used to treat synthetic wastewater, and the nutrients removal performance was invest...

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Bibliographic Details
Published in:Journal of environmental engineering (New York, N.Y.) N.Y.), 2023-08, Vol.149 (8)
Main Authors: Peng, Zhaoxu, Meng, Fanchao, Zhang, Wangcheng, Ji, Jiantao, Huang, Zehan, Gu, Likun, Liu, Bingyan
Format: Article
Language:English
Subjects:
Batch reactors
Biological wastewater treatment
Carbon
Carbon sources
Chemical oxygen demand
Denitrification
Dissolved oxygen
Hydraulic retention time
Nitrification
Nutrient removal
Nutrients
Phosphorus
Retention
Retention time
Sequencing batch reactor
Sewage treatment plants
Technical Papers
Wastewater treatment
Wastewater treatment plants
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Summary:AbstractThe nonaerobic stage is critical for the processes of denitrification and phosphorus release in biological wastewater treatment. A lab-scale sequencing batch reactor (SBR) operating as nonaerobic/aerobic was used to treat synthetic wastewater, and the nutrients removal performance was investigated under different nonaerobic hydraulic retention times (HRTs). The results showed when the nonaerobic HRT changed from 0 to 4 h with constant aerobic HRT of 8 h [dissolved oxygen (DO) 0.50–1.50  mg·L−1], the removal efficiencies of PO43−─P and NH4+─N were all above 90.00%, respectively. The nonaerobic HRT could influence carbon utilization between denitrification and phosphorus release, which showed a close relationship with the ratio of consumed chemical oxygen demand (COD)phosphorus release to CODdenitrification (0.94). Specifically, the consumed CODphosphorus release increased with the increase of nonaerobic HRT (0.90), whereas the relationship between consumed CODdenitrification and nonaerobic HRT was limited (−0.60). Furthermore, internal carbon source produced through phosphorus release could promote simultaneous nitrification denitrification. This control strategy could be conveniently applied in intermittent-flow sewage treatment plant through adjusting nonaerobic HRT.
ISSN:0733-9372
1943-7870
DOI:10.1061/JOEEDU.EEENG-7310