Partial nitritation treatment of underground brine waste with high ammonium and salt content(ENVIRONMENTAL BIOTECHNOLOGY)

概要

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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 1.6kg NO_2-N m^<-3>d^<-1> was obtained under a nitrogen loading rate of 3.0kg-N m^<-3>d^<-1>, at a pH of 7.5 and a temperature of 25℃. 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.
社団法人日本生物工学会の論文