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/(m3 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/(m3 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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This study was funded by non-profit Research Foundation for Agriculture (201303091), China Agriculture Research System (CARS-36), and the National Natural Science Foundation of China (No. 41501513).
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Sui, Q., Liu, C., Zhang, J. et al. Response of nitrite accumulation and microbial community to free ammonia and dissolved oxygen treatment of high ammonium wastewater. Appl Microbiol Biotechnol 100, 4177–4187 (2016). https://doi.org/10.1007/s00253-015-7183-z
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DOI: https://doi.org/10.1007/s00253-015-7183-z