Efficient and advanced nitrogen removal from mature landfill leachate via combining nitritation and denitritation with Anammox in a single sequencing batch biofilm reactor. (August 2021)

• Record Type: Journal Article
• Authors: Jiang, Hao; Yang, Pei; Wang, Zhong; Ren, Shang; Qiu, Jingang; Liang, Haoran; Peng, Yongzhen; Li, Xiyao; Zhang, Qiong
• Is Part Of: Bioresource technology. Volume 333(2021)
• Publication Date: 2021-08
• Subjects: Landfill leachate -- Anammox -- Nitritation -- Denitritation -- Continuous feeding of carbon source; 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.2021.125138
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Combined PnA/PdA process was realized in a single SBR to treat landfill leachate. NRR and NRE were improved to 2.83 ± 0.06 kgN/(m 3 ∙d) and 98.6 ± 0.2%, respectively. Comparable activities of AOB and AnAOB were realized in aerobic period. Continuous feeding of carbon source reduced NO3 – -N accumulation in anoxic period. Kuenenia dominated, and Brocadia and Jettenia were enriched in situ in the system. Abstract: A novel combined partial nitrification-Anammox and partial denitrification-Anammox (PnA/PdA) single sequencing batch biofilm reactor (SBBR) was established to realize efficient and advanced nitrogen removal from mature landfill leachate with low biodegradability. Nitrogen removal rate and nitrogen removal efficiency were increased to 2.83 ± 0.06 kgN/(m 3 ∙d) and 98.6 ± 0.2% by stepwise increase of dissolved oxygen (DO, from 0.5 to 3.5 mg/L) and continuous carbon source feeding. Comparable activities of ammonia oxidation bacteria and Anammox bacteria were realized during aerobic period. More organic carbon was redirected from complete denitrification to partial denitrification during anoxic period. The main pathway PnA jointly synergized with PdA, which contributed to 76.04% and 19.44% nitrogen removal, respectively. Nitrosomonas, Thauera, and Kuenenia dominated in floc sludge (0.78%, 5.38%, and 1.14%, respectively) and biofilm (0.34%, 5.18%, and 0.98%, respectively). Overall, this study provides new insight into the high-efficiency treatment of landfill leachate at full-scale landfill sites.