Effect of solids retention time on nitrogen and phosphorus removal from municipal wastewater in a sequencing batch membrane bioreactor

This study evaluated the removal of organic matter, nitrogen and phosphate from a municipal wastewater in a sequencing batch membrane bioreactor (SBMBR) operated at different solids retention times (SRTs) and subjected to different aeration profiles. The results demonstrated that SRT reduction from...

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Bibliographic Details
Published in:Environmental technology 2017-04, Vol.38 (7), p.806-815
Main Authors: Belli, Tiago José, Bernardelli, Jossy Karla Brasil, da Costa, Rayra Emanuelly, Bassin, João Paulo, Amaral, Miriam Cristina Santos, Lapolli, Flávio Rubens
Format: Article
Language:English
Subjects:
Bioreactors
Bioreactors - microbiology
Chemical oxygen demand
Efficiency
membrane bioreactor
Membranes
Nitrogen
Nitrogen - isolation & purification
Nutrient removal
Phosphates
Phosphorus - isolation & purification
Phosphorus removal
Reduction
Retention
sequencing batch reactor
solids retention time
Waste Disposal, Fluid - methods
Wastewater treatment
Water Purification - methods
Water treatment plants
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Summary:This study evaluated the removal of organic matter, nitrogen and phosphate from a municipal wastewater in a sequencing batch membrane bioreactor (SBMBR) operated at different solids retention times (SRTs) and subjected to different aeration profiles. The results demonstrated that SRT reduction from 80 to 20 d had a negligible effect on chemical oxygen demand (COD) removal and only a slight negative effect on nitrification. COD removal efficiency remained stable at 97%, whereas ammonium removal decreased from 99% to 97%. The total nitrogen removal efficiency was improved by SRT reduction, increasing from 80% to 86%. Although the total phosphorus (TP) removal was not significantly affected by the SRT reduction, ranging from 40-49%, the P-release and P-uptake processes were observed to increase as the SRT was reduced. The implementation of a pre-aeration phase in the SBMBR operating cycle allowed a higher TP removal performance, which reached up to 76%. Batch tests suggested that the fraction of phosphate removed anoxically from the total (anoxic + aerobic) phosphate removal decreased with the SRT reduction.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2016.1212934