Journal
BIORESOURCE TECHNOLOGY
Volume 177, Issue -, Pages 217-223Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.11.094
Keywords
Trickling filter; Hydraulic loading rate; Functional gene group; Nitrogen transformation process; Path analysis
Funding
- National Key Technology R&D Program of China [2012BAJ25B01]
- National Natural Science Foundation of China [51179001]
- Jilin Province Transportation Science and Technology Projects [2011-1-7]
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A study was conducted of treatment performance and nitrogen transformation processes in a trickling filter (TF) used to treat micro-polluted source water under variable hydraulic loading rates (HLRs), ranging from 1.0 to 3.0 m(3)/m(2) d. The TF achieved high and stable COD (97.7-99.3%) and NH4+-N (67.3-92.7%) removal efficiencies. Nitrification and anaerobic ammonium oxidation were the dominant nitrogen removal processes in the TF. Path analysis indicated that amoA/anammox and amoA/(narG + napA) were the two key functional gene groups driving the major processes for NH4+-N and NO2-N, respectively. The analysis also revealed that anammox/amoA and nxrA/(nirK + nirS) were the two key functional gene groups affecting processes associated with the NO3-N transformation rate. The direct and indirect effect of functional gene groups further confirmed that nitrogen transformation processes are coupled at the molecular level, resulting in a mutual contribution to nitrogen removal in the TF. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.
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