厌氧氨氧化菌
环境科学
比例(比率)
化学
反硝化
环境化学
环境工程
氮气
物理
量子力学
反硝化细菌
有机化学
作者
Joachim Desloover,Haydée De Clippeleir,Pascal Boeckx,Gijs Du Laing,Joop Colsen,Willy Verstraete,Siegfried E. Vlaeminck
出处
期刊:Water Research
[Elsevier]
日期:2011-04-01
卷期号:45 (9): 2811-2821
被引量:173
标识
DOI:10.1016/j.watres.2011.02.028
摘要
New Activated Sludge (NAS®) is a hybrid, floc-based nitrogen removal process without carbon addition, based on the control of sludge retention times (SRT) and dissolved oxygen (DO) levels. The aim of this study was to examine the performance of a retrofitted four-stage NAS® plant, including on-line measurements of greenhouse gas emissions (N2O and CH4). The plant treated anaerobically digested industrial wastewater, containing 264 mg N L−1, 1154 mg chemical oxygen demand (COD) L−1 and an inorganic carbon alkalinity of 34 meq L−1. The batch-fed partial nitritation step received an overall nitrogen loading rate of 0.18–0.22 kg N m−3 d−1, thereby oxidized nitrogen to nitrite (45–47%) and some nitrate (13–15%), but also to N2O (5.1–6.6%). This was achieved at a SRT of 1.7 d and DO around 1.0 mg O2 L−1. Subsequently, anammox, denitrification and nitrification compartments were followed by a final settler, at an overall SRT of 46 d. None of the latter three reactors emitted N2O. In the anammox step, 0.26 kg N m−3 d−1 was removed, with an estimated contribution of 71% by the genus Kuenenia, which constituted 3.1% of the biomass. Overall, a nitrogen removal efficiency of 95% was obtained, yielding a dischargeable effluent. Retrofitting floc-based nitrification/denitrification with carbon addition to NAS® allowed to save 40% of the operational wastewater treatment costs. Yet, a decrease of the N2O emissions by about 50% is necessary in order to obtain a CO2 neutral footprint. The impact of emitted CH4 was 20 times lower.
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