Achieving reliable partial nitrification and anammox process using polyvinyl alcohol gel beads to treat low-strength ammonia wastewater. (March 2021)

• Record Type: Journal Article
• Authors: Wang, Jinxing; Liang, Jidong; Sun, Li; Shen, Jianqing; Wang, Meng
• Is Part Of: Bioresource technology. Volume 324(2021)
• Publication Date: 2021-03
• Subjects: Partial nitrification -- Anammox -- PVA gel beads -- Low-strength ammonia wastewater; 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.2021.124669
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Using PVA gel beads achieve a reliable PN/A process to treat LAWW. PVA gel beads favor anammox and ammonia oxidizing bacteria enrichment. DO and substrate diffusion in gel beads facilitate microbial stratification. Abstract: In this study, polyvinyl alcohol (PVA) gel beads were used to aid the partial nitrification and anammox process (PN/A) for treating low-strength ammonia wastewater. When treating synthetic and municipal wastewater, the reactor amended with PVA gel beads achieved a total nitrogen removal efficiency of 75.1 ± 8.4% and 66.6 ± 7.0% respectively, while the control reactor without PVA gel beads achieved 63.2 ± 7.8% and 28.2 ± 11.5% respectively. Dissolved oxygen (<0.5 mg O2 L −1 ) and substrate diffusion in porous PVA gel beads facilitated the formation of microbial stratification in the gel beads. Unclassified Candidatus Brocadiaceae (major anammox bacteria) and Ignavibacterium (major ammonia oxidizing bacteria) enriched in the inside and outside layers of PVA gel beads, which benefited the synergetic cooperation of these bacteria and protecting them from environmental fluctuations. This study provides a promising solution for achieving a reliable PN/A process in mainstream wastewater treatment.