Optimizing vertical flow aerated steel slag filter system with nitrifiers bacteria for nutrients' removal from domestic wastewater: a pilot study
2021
Hamdan, Rafidah | Ibrahim, Izzati Izwani | Wan Mohamed, Wan Afnizan | Al‐Gheethi, Adel | Othman, Norzila | Mohamed, Radin
BACKGROUND: The present study aimed to optimize the removal efficiency of ammonia nitrogen (NH₃‐N) and total kjeldhal nitrogen (TKN) from domestic wastewater as a function of hydraulic loading rates (HLRs) (0.16–5.44 m³ m–³ day–¹) and the aeration rate (3, 5 and 10 L min–¹) in a vertical flow aerated steel slag filter (VFASSF) system with nitrifier bacteria. The nitrifier bacterial cell morphology was determined using scanning electron microscopy (SEM) analysis. RESULTS: The HLRs affected the performance of the VFASSF in removing TKN and NH₃‐N from domestic wastewater. The optimal air flow rate for removing NH₃‐N and TKN was recorded with 10 L min–¹ and HLR 2.72 m³ m–³ day–¹, at which the removal efficiency was >91% compared to 90% and 88% with 3 L min–¹ and 5 L min–¹ air flow rate, respectively. The high removal was a consequence of the high aeration which enhances the nitrification process performed by the nitrifying bacteria in the VFASSF. CONCLUSIONS: These findings reflected the applicability of VFASSF in the treatment and removal of nutrients from domestic wastewater. © 2020 Society of Chemical Industry
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