Revealing the effect of biofilm formation in partial nitritation-anammox systems: Start-up, performance stability, and recovery. (August 2022)

• Record Type: Journal Article
• Authors: Wang, Hong; Chen, Chen; Yang, Enzhe; Tu, Zhi; Liang, Jie; Dai, Xiaohu; Chen, Hong
• Is Part Of: Bioresource technology. Volume 357(2022)
• Publication Date: 2022-08
• Subjects: Partial nitritation-anammox -- Suspended sludge -- Biofilm -- Nitrogen removal -- Mainstream; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127379
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Efficient NREs were achieved in PNA-S and PNA-B systems with low-ammonia influent. PNA-S system showed good adaptability during start-up time. Enrichment and protection of biofilm improve performance stability. Biofilm formation inhibits recovery from shock due to the growth of NOB. Abstract: 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.