Castro-Barros Celia M, Ho Long T, Winkler Mari K H, Volcke Eveline I P
a Department of Biosystems Engineering , Ghent University , Gent , Belgium.
b Department of Civil and Environmental Engineering , University of Washington , Seattle , WA , USA.
Environ Technol. 2018 Jul;39(13):1615-1625. doi: 10.1080/09593330.2017.1334709. Epub 2017 Jun 8.
Combined partial nitritation-anaerobic ammonium oxidation (anammox) processes have been widely applied for nitrogen removal from anaerobic digestion reject water. However, such streams also contain dissolved methane that can escape to the atmosphere, hence contributing to global warming. This study investigates the possibility of integrating methane removal in aerobic anammox-based granular sludge reactors, through modelling and simulation. Methane removal could be established through aerobic methane-oxidizing bacteria (MOB), denitrifying anaerobic methane-oxidizing bacteria (damoB, NO + CH → N + CO), and/or archaea (damoA, NO + CH → NO + CO). The simulation results demonstrated that the combined removal of nitrogen and methane was feasible at low dissolved oxygen conditions. Aerobic MOB were the main responsible microorganisms for removing methane. A sensitivity analysis of key kinetic parameters showed a shift in the methanotrophic populations depending on the most favourable parameters for each microbial group, while keeping high nitrogen and methane removal efficiencies. Possible methane stripping during aeration could be limited by increasing the depth within the reactor column at which aeration was supplied. Overall, the integration of methane removal in aerobic anammox-based granular sludge reactors seems to be a promising process option to reduce the carbon footprint from wastewater treatment.
部分亚硝化-厌氧氨氧化（anammox）联合工艺已广泛应用于厌氧消化剩余污泥的脱氮处理。然而，这些水流中还含有溶解态甲烷，其可能逸散到大气中，从而加剧全球变暖。本研究通过建模与模拟，探究了在基于好氧anammox的颗粒污泥反应器中集成甲烷去除功能的可能性。甲烷去除可通过好氧甲烷氧化菌（MOB）、反硝化厌氧甲烷氧化菌（damoB，NO + CH → N + CO）和/或古菌（damoA，NO + CH → NO + CO）来实现。模拟结果表明，在低溶解氧条件下，联合去除氮和甲烷是可行的。好氧MOB是去除甲烷的主要责任微生物。对关键动力学参数的敏感性分析表明，根据每个微生物群体最有利的参数，甲烷营养菌群会发生变化，同时保持较高的氮和甲烷去除效率。曝气过程中可能的甲烷吹脱可通过增加曝气供应处的反应器柱深度来限制。总体而言，在基于好氧anammox的颗粒污泥反应器中集成甲烷去除功能似乎是一个有前景的工艺选择，可减少废水处理的碳足迹。
