Title
Efficient total nitrogen removal in an ammonia gas biofilter through high-rate OLAND Efficient total nitrogen removal in an ammonia gas biofilter through high-rate OLAND
Author
Faculty/Department
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
Easton, Pa ,
Subject
Chemistry
Biology
Source (journal)
Environmental science and technology / American Chemical Society. - Easton, Pa
Volume/pages
46(2012) :16 , p. 8826-8833
ISSN
0013-936X
ISI
000307697700036
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
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.
E-info
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