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      Response of nitrite accumulation and microbial community to free ammonia and dissolved oxygen treatment of high ammonium wastewater.

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          Abstract

          The effects of free ammonia (FA) and dissolved oxygen (DO) on nitrite accumulation in the treatment of high ammonium wastewater and on the evolution of the microbial community were investigated. Under high DO conditions (3.75 ± 0.49 mg/L), FA as high as 10.61 ± 2.89 mg NH3/L maintained stable nitrite accumulation rate (NAR) of 84 % with NH4 (+)-N load of 2.05 kg N/(m(3) day) at sludge retention time (SRT) of 15-18 days. After 56 days of operation, Proteobacteria and Nitrosomonas were the dominant phylum and genus, respectively; Nitrosomonas increased from 21.14 to 54.57 %. By contrast, under relative low DO and low FA, nitrite-oxidizing bacteria (NOB) were nearly eliminated (NOB/AOB of 0; ammonium-oxidizing bacteria (AOB)), and NAR of 94 % was achieved with lower NH4 (+)-N load of 0.48 kg N/(m(3) day). DO correlated with AOB and NOB abundance, and FA decreased NOB activity and the NOB/AOB ratio. In conclusion, high FA and high DO conditions are optimal for efficient nitrite accumulation.

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          Author and article information

          Journal
          Appl. Microbiol. Biotechnol.
          Applied microbiology and biotechnology
          Springer Nature America, Inc
          1432-0614
          0175-7598
          May 2016
          : 100
          : 9
          Affiliations
          [1 ] Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
          [2 ] The Key Laboratory of Energy Conservation and Waste Treatment of Agricultural Structures, Ministry of Agriculture, Beijing, 100081, China.
          [3 ] Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
          [4 ] Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, China. donghongmin@caas.cn.
          [5 ] The Key Laboratory of Energy Conservation and Waste Treatment of Agricultural Structures, Ministry of Agriculture, Beijing, 100081, China. donghongmin@caas.cn.
          Article
          10.1007/s00253-015-7183-z
          10.1007/s00253-015-7183-z
          26743659
          687b80cb-dc23-45b3-bf5f-e0754f6c3d40
          History

          Nitrite accumulation,Dissolved oxygen,Free ammonia,High-throughput sequencing,Microbial community

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