Simultaneous carbon, nitrogen and phosphorus removal in sequencing batch membrane aerated biofilm reactor with biofilm thickness control via air scouring aided by computational fluid dynamics.
Bioresour Technol
; : 131267, 2024 Aug 12.
Article
em En
| MEDLINE
| ID: mdl-39142417
ABSTRACT
Membrane aerated biofilm reactor (MABR) is challenged by biofilm thickness control and phosphorus removal. Air scouring aided by computational fluid dynamics (CFD) was employed to detach outer biofilm in sequencing batch MABR treating low C/N wastewater. Biofilm with 177-285⯵m thickness in cycle 5-15 achieved over 85â¯% chemical oxygen demand (COD) and total inorganic nitrogen (TIN) removals at loading rate of 13.2 gCOD/m2/d and 2.64 gNH4+-N/m2/d. Biofilm rheology measurements in cycle 10-25 showed yield stress against detachment of 2.8-7.4â¯Pa, which were equal to CFD calculated shear stresses under air scouring flowrate of 3-9â¯L/min. Air scouring reduced effluent NH4+-N by 10â¯% and biofilm thickness by 78⯵m. Intermittent aeration (4h off, 19.5h on) and air scouring (3â¯L/min, 30â¯s before settling) in one cycle achieved COD removal over 90â¯%, TIN and PO43--P removals over 80â¯%, showing great potential for simultaneous carbon, nitrogen and phosphorus removals.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Bioresour Technol
Assunto da revista:
ENGENHARIA BIOMEDICA
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China