Co-existing Anammox, Ammonium-Oxidizing, and Nitrite-Oxidizing Bacteria in Biocathode-Biofilms Enable Energy-Efficient Nitrogen Removal in a Bioelectrochemical Desalination Process

厌氧氨氧化菌 硝基螺 亚硝基单胞菌 硝化细菌 微生物燃料电池 化学 环境化学 化学需氧量 氮气 硝化作用 环境工程 废水 反硝化 反硝化细菌 环境科学 有机化学 电极 物理化学 阳极
作者
Umesh Ghimire,Veera Gnaneswar Gude,Renotta K. Smith,John P. Brooks,Dewayne Deng
出处
期刊:ACS Sustainable Chemistry & Engineering [American Chemical Society]
卷期号:9 (14): 4967-4979 被引量:13
标识
DOI:10.1021/acssuschemeng.0c07883
摘要

In this study, a nitritation-anammox biocathode microbial desalination cell (NiAmoxMDC) was studied for its potential in nitrogen and salinity removal. A maximum power density of 1.007 W/m3 and an average TDS removal of 53.9 ± 4.1% were accomplished. The average COD (chemical oxygen demand) removal in each cycle was around 72.1 ± 1.6%, and the corresponding average CE (Coulombic efficiency) of the NiAmoxMDC was 25.6 ± 6.1%. The net energy produced by the NiAmoxMDC at an aeration rate of 3 mL/min was 0.031 kWh/m3. The energy consumption by the NiAmoxMDC was between 0.12 and 0.58 kWh/kg-N, which is significantly lower than other conventional and bioelectrochemical nitrogen removal processes. At an aeration rate of 3 mL/min or a dissolved oxygen concentration of 0.8 mg-O2/L, 97.7% of the NH4+-N removal and 74.7% of the total nitrogen removal were achieved. Microbial community analysis of the nitritation-anammox cathode showed a relative abundance species of 29.3% belonging to the order of Ignavibacteriales. The second most abundant phylum was affiliated to the Planctomycetes phylum (20.5%) belonging to the order of Candidatus Brocadiales. Aerobic ammonium-oxidizing bacteria (AOBs), Nitrospira multiformis, Nitrosomonas europaea genome sequence, and Nitrosomonas sp. with relative abundances of 0.1%, 0.05%, and 1.2%, respectively, were found in the biocathode chamber. The co-existence of AOBs and anammox bacteria in the NiAmoxMDC cathode was confirmed. Thus, bioelectrochemical nitritation-anammox approach has been shown to be a synergistic solution for resource-efficient wastewater treatment.
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