1. Efficient carbon, nitrogen and phosphorus removal from low C/N real domestic wastewater with aerobic granular sludge
- Author
-
Matteo Ramazzotti, Riccardo Campo, Lorenzo Mazzoli, Tommaso Lotti, Sara Sguanci, S. Caffaz, and Claudio Lubello
- Subjects
0106 biological sciences ,Environmental Engineering ,Denitrification ,Renewable Energy, Sustainability and the Environment ,Phosphorus ,Chemical oxygen demand ,chemistry.chemical_element ,Bioengineering ,General Medicine ,010501 environmental sciences ,01 natural sciences ,chemistry.chemical_compound ,chemistry ,Wastewater ,010608 biotechnology ,Environmental chemistry ,Nitrification ,Nitrite ,Waste Management and Disposal ,Effluent ,Aerobic Granular Sludge ,Low influent C/N ratio ,High SRT-low observed yield factor ,Nutrients removal ,Simultaneous nitrification/denitrification via nitrite ,0105 earth and related environmental sciences ,Total suspended solids - Abstract
This work reports on simultaneous nitrification, denitrification and phosphorus removal treating real domestic wastewater with low carbon/nitrogen (C/N) ratio by aerobic granular sludge (AGS). Operations at high sludge retention time (SRT = 61 ± 24 days) resulted in low biomass yield per chemical oxygen demand removed (CODrem) (0.21 ± 0.01 gCODx/gCODrem), lower COD demand for denitrification as well as high effluent quality in terms of total suspended solids (TSS) (22 ± 7 mgTSS/L). The average ratio between the biodegradable soluble COD stored anaerobically as polyhydroxyalkanoates (PHAs) and the N removed was 3.1 ± 0.6 gCODsto/gNrem, suggesting that nitrification/denitrification occurred partly via the nitrite pathway. Results revealed that stable AGS process with high C/N/P removal efficiency of 84/71/96% can be obtained besides a low organic loading rate (0.43 ± 0.11 g COD/L/d) and influent C/N ratio (3.8 ± 1.6 g/g), resulting in a high effluent quality characterized by 25 ± 6 mg sCOD/L, 0.09 ± 0.07 mgPO4-P/L, 9 ± 2 mgTIN/L (10 ± 2 mgTN/L) and 22 ± 7 mgTSS/L.
- Published
- 2020