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Indexed by:期刊论文

Date of Publication:2009-10-01

Journal:JOURNAL OF BIOSCIENCE AND BIOENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:108

Issue:4

Page Number:330-335

ISSN No.:1389-1723

Key Words:Anammox; Free ammonia; Nitrogen removal; Partial nitritation; Salinity

Abstract:Underground brine waste containing high concentrations of ammonium and with a salinity of 3% is usually generated during the production of methane gas and iodine in the gas field of Chiba Prefecture, Japan. In this study, one swim-bed reactor, packed with a novel acrylic fiber biomass carrier (Biofringe), was applied to the partial nitritation treatment of this kind of underground brine waste. A stable nitrite production rate of 1.6 kg NO(2-)Nm(-3) d(-1) was obtained under a nitrogen loading rate of 3.0 kg-N m(-3) d(-1), at a pH of 7.5 and a temperature of 25 degrees C. Nitrate production was negligible and the effluent NO(2)-N/NO(x)-N ratio was above 98% due to the successful inhibition of nitrite-oxidizing bacterial activity. Free ammonia was considered to be the main factor for inhibiting the activity of nitrite-oxidizing bacteria. A microbial community shift was demonstrated by 16S rRNA analysis, and it was shown that the ammonium-oxidizing bacteria became the predominant species after successful nitrite accumulation was observed. (C) 2009, The Society for Biotechnology, Japan. All rights reserved.