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- Title
Response of nitrite accumulation and microbial community to free ammonia and dissolved oxygen treatment of high ammonium wastewater.
- Authors
Sui, Qianwen; Liu, Chong; Zhang, Junya; Dong, Hongmin; Zhu, Zhiping; Wang, Yi
- 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 NH/L maintained stable nitrite accumulation rate (NAR) of 84 % with NH-N load of 2.05 kg N/(m 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 NH-N load of 0.48 kg N/(m 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.
- Subjects
NITRITES; AMMONIUM; SEWAGE; DISSOLVED oxygen in water; PROTEOBACTERIA; NITROSOMONAS
- Publication
Applied Microbiology & Biotechnology, 2016, Vol 100, Issue 9, p4177
- ISSN
0175-7598
- Publication type
Article
- DOI
10.1007/s00253-015-7183-z