Journal
BIORESOURCE TECHNOLOGY
Volume 357, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127379
Keywords
Partial nitritation-anammox; Suspended sludge; Biofilm; Nitrogen removal; Mainstream
Funding
- China Hunan Provincial Science & Technology Department [2022SK2091, 2020JJ4602, 2020JJ4617]
- Hunan Provincial Department of Education [20A002, 20C0017]
- Ecol-ogy and Environment Department of Hunan
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This study compared the performance characteristics of PNA systems with and without carriers in treating wastewater. The results showed that both the suspended sludge system and the biofilm system achieved stable nitrogen removal efficiencies. The biofilm system had a longer start-up time but demonstrated stable performance under aeration shock. The suspended sludge system displayed good elasticity for performance recovery. Controlling dissolved oxygen could enhance the activity and abundance of functional microbes.
Successful application of partial nitritation-anammox (PNA) processes is currently and primarily associated with biofilm systems. Biofilm characteristics significantly influence start-up, performance stability, and recovery. Here, two PNA systems with and without carriers were implemented simultaneously for treating wastewater containing 50 mg-NH4/L. The performance characteristics of these two PNA systems were compared. Stable nitrogen removal efficiencies of 76.3 +/- 2.8% and 72.9 +/- 1.6% were obtained for suspended sludge and biofilm systems, respectively. The slow process of biofilm colonization resulted in a long start-up time in the biofilm system. Biofilm enrichment and protection conferred stable performance when exposed to aeration shock. The suspended sludge system displayed good elasticity during performance recovery after shock compared to the slow recovery in the biofilm system. Moreover, suitable control of dissolved oxygen could improve the activity and abundance of the functional microbes. This study provides new insights into the operation and control of PNA systems for treating mainstream wastewater.
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