Advanced nitrogen removal from mature landfill leachate based on novel step-draining partial nitrification-denitrification and Anammox process: Significance of low volume exchange ratio. (November 2022)

• Record Type: Journal Article
• Authors: Jiang, Hao; Li, Xiyao; Zhang, Fangzhai; Wang, Zhong; Ren, Shang; Qiu, Jingang; Wang, Shuying; Peng, Yongzhen
• Is Part Of: Bioresource technology. Volume 364(2022)
• Publication Date: 2022-11
• Subjects: Step-draining mode -- Landfill leachate -- Partial nitrification and denitrification -- Anammox -- Granule sludge; 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.2022.128025
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Step-draining PND-AMX system achieved NRE and NRR of 98.3% and 3.07 kgN/(m 3 ∙d). COD and TIN were removed synergistically with full use of carbon source at 25% VER. Adjusting VER of the two effluents obtained optimal NH4 + to NO2 − ratio of Anammox. ORP curves along depth of particles revealed sludge granulation mechanism. Partial Anammox contributed 21.0% to TIN removal and had practical significance. Abstract: To save external carbon source dosage and simplify NH4 + to NO2 − ratio control strategy, this study established a novel step-draining based partial nitrification-denitrification and Anammox (PND-AMX) system for advanced nitrogen removal from mature landfill leachate. Separation of partial nitrification and denitrification was realized based on step-draining, achieving 74.8 % nitrogen removal. 25 % was the optimal volume exchange ratio for synergistic removal of organics and nitrogen, allowing full use of carbon source. NH4 + to NO2 − ratio was easily controlled by varying the volume ratio of the first and second effluent of PND reactor. Brocadia, Kuenenia and Jettenia collectively accounted for 13.61 % in AMX reactor, contributing 21.0 % of nitrogen removal. Nitrogen removal efficiency and nitrogen removal rate reached 98.3 ± 1.2 % and 3.07 ± 0.09 kgN/(m 3 ∙d), respectively. Partial Anammox process based on step-draining was easier to realize and of practical significance for application in treatment of landfill leachate.