Title
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Efficient total nitrogen removal in an ammonia gas biofilter through high-rate OLAND
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Author
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Abstract
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Ammonia gas is conventionally treated in nitrifying biofilters; however, addition of organic carbon to perform post-denitrification is required to obtain total nitrogen removal. Oxygen-limited autotrophic nitrification/denitrification (OLAND), applied in full-scale for wastewater treatment, can offer a cost-effective alternative for gas treatment. In this study, the OLAND application thus was broadened toward ammonia loaded gaseous streams. A down flow, oxygen-saturated biofilter (height of 1.5 m; diameter of 0.11 m) was fed with an ammonia gas stream (248 +/- 10 ppmv) at a loading rate of 0.86 +/- 0.04 kg N m(-3) biofilter d(-1) and an empty bed residence time of 14 s. After 45 days of operation a stable nitrogen removal rate of 0.67 +/- 0.06 kg N m(-3) biofilter d(-1), an ammonia removal efficiency of 99%, a removal of 75-80% of the total nitrogen, and negligible NO/N2O productions were obtained at water flow rates of 1.3 +/- 0.4 m(3) m(-2) biofilter section d(-1). Profile measurements revealed that 91% of the total nitrogen activity was taking place in the top 36% of the filter. This study demonstrated for the first time highly effective and sustainable autotrophic ammonia removal in a gas biofilter and therefore shows the appealing potential of the OLAND process to treat streams. |
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Language
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English
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Source (journal)
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Environmental science and technology / American Chemical Society. - Easton, Pa
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Publication
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Easton, Pa
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2012
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ISSN
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0013-936X
[print]
1520-5851
[online]
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DOI
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10.1021/ES301717B
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Volume/pages
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46
:16
(2012)
, p. 8826-8833
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ISI
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000307697700036
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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