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Simultaneous partial nitrification, denitrification, and phosphorus removal in sequencing batch reactors via controlled reduced aeration and short-term sludge retention time decrease
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DOI：10.1016/j.jenvman.2023.118598.png)
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Abstract
En 中文
Simultaneous bio-treatment processes of organic carbon (C)-, nitrogen (N)-, and phosphorus (P)-containing wastewater are challenged by insufficient carbon sources in the effluent. In the present study, two parallel anaerobic/aerobic sequencing batch reactors (R-1 and R-2) treating low C/N (< 4) wastewater were employed using different partial nitrification start-up strategies, controlled reduced aeration, and decreased sludge retention time. Advanced removal efficiencies for NH4+-N (>= 96%), total nitrogen (TN, >= 86%), PO43- -P (>= 95%), and CODintra (>= 91%) were realized, with TN and PO43- -P effluent concentrations of 10.0 +/- 3.5 and 0.11 +/- 0.3 mg/L in R-1 and 9.28 +/- 4.0 and 0.11 +/- 0.1 mg/L in R-2, respectively. Higher nitrite accumulation rate (nearly 100%) and TN (121.1 +/- 0.7 mg TN/g VSS.d) and P (12.5 +/- 0.6 mg PO43- -P/g VSS.d) removal loadings were obtained in R-2 by a thorough elimination of nitrite-oxidizing bacteria. Moreover, different microbial structures and nutrient removal pathways were identified. Denitrifying glycogen-accumulating organisms (Candidatus Competibacter) and phosphorus-accumulating organisms (PAOs) (Tetrasphaera) removed N and P with partial nitrification-endogenous denitrification pathways and aerobic P removal in R-1. In R-2, aerobic denitrifying bacteria (Psychrobacter) and PAOs ensured N and P removal through the partial nitrification-aerobic denitrification and aerobic P removal pathways. Compared to R-1, R-2 offers greater efficiency, convenience, and scope to further reduce carbon-source demand.
Keywords:
Partial nitrification
Endogenous denitrification
Aerobic denitrification
Phosphorus-accumulating organisms
Ammonium-oxidizing bacteria
Low carbon
nitrogen wastewater
Journal
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8.4
Papers:
2.8W
Citations:
13.7W