Effect of hydraulic residence time and inlet flow distribution ratio on the pollutant removal of low‐temperature municipal wastewater in multistage AO process

Low temperature environment was one of the difficulties in sewage treatment. In this study, the removal efficiency of multistage AO process was analysed under different hydraulic residence time (12 h, 8 h and 6 h) and inlet flow distribution ratio(5 : 4 : 4, 3 : 2 : 1 and 25 : 15 : 6), the rules of...

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Bibliographic Details
Published in:Water and environment journal : WEJ 2020-12, Vol.34 (S1), p.742-752
Main Authors: Wang, Fan, Li, Jun, Bian, Dejun, Nie, Zebing, Ai, Shengshu, Tian, Xi, Wang, Hongliang
Format: Article
Language:English
Subjects:
Ammonia
Denitrification
Distribution
Flow distribution
Hydraulic retention time
Hydraulics
influent distribution ratio
Influents
Inlet flow
Load distribution
Low temperature
Low temperature environments
Municipal wastewater
Nitrification
nitrification and denitrification
Nitrogen
Nitrogen removal
Organic loading
Organic matter
Pollutant removal
Pollutants
Removal
Residence time
Residence time distribution
Retention time
Sewage
Sewage treatment
step feeding
Stress concentration
Waste treatment
Wastewater
Wastewater treatment
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Summary:Low temperature environment was one of the difficulties in sewage treatment. In this study, the removal efficiency of multistage AO process was analysed under different hydraulic residence time (12 h, 8 h and 6 h) and inlet flow distribution ratio(5 : 4 : 4, 3 : 2 : 1 and 25 : 15 : 6), the rules of pollutant migration and transformation were compared and analysed under different control parameters. The results show that enhanced nitrogen removal and optimised organics utilisation were obtained simultaneously in the feeding process with hydraulic retention time of 8 h as well as influent distribution ratio of 3 : 2 : 1. HRT and inlet flow distribution ratio affect nitrogen load and organic matter distribution in each stage of the multistage AO system, the removal efficiency of ammonia nitrogen in each stage of the system was more than 80% under optimal conditions, the total nitrogen removal rate was more than 80%, among which the synchronous nitrification and denitrification account for 29.50%.
ISSN:1747-6585
1747-6593
DOI:10.1111/wej.12574