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- Title
Characterization of oligotrophic AnAOB culture: morphological, physiological, and ecological features.
- Authors
Hu, Qian-Yi; Kang, Da; Wang, Ru; Ding, A-Qiang; Abbas, Ghulam; Zhang, Meng; Qiu, Lin; Lu, Hui-Feng; Lu, Hui-Jie; Zheng, Ping
- Abstract
Anaerobic ammonium oxidation (anammox) process is regarded as a promising nitrogen removal technology to treat ammonium wastewaters in a wide concentration range. Oligotrophic anaerobic ammonia oxidation bacteria (O-AnAOB) culture has been successfully achieved from a new anammox system to treat superlow ammonium concentration wastewaters. In this work, the O-AnAOB culture was compared with the eutrophic AnAOB (E-AnAOB) culture to reveal its physiological, morphological, and ecological features. Results showed that the specific anammox activity (SAA) of O-AnAOB culture was 0.07 kgN/(kgVSS·d) with the nitrogen removal rate (NRR) of 0.20 kgN/ (m d) in the reactor, while the SAA of E-AnAOB culture was 2.11 kgN/(kgVSS·d) with the NRR of 11.10 kgN/(m d). The hzs gene transcription levels ( hzs-mRNA) of O-AnAOB and E-AnAOB cultures were 1.32 × 10 copies/gVSS and 1.51 × 10 copies/gVSS, respectively. Morphologically, the O-AnAOB culture took on the unique brown color rather than the typical red color of E-AnAOB. The O-AnAOB cells lived in a disperse pattern in the culture. The cells were seriously deformed with deep craters on the cell wall. The size of anammoxsome and paryphoplasm compartments inside the O-AnAOB cells was smaller than that inside the E-AnAOB cells. Ecologically, the O-AnAOB culture had special microbial community with a higher bacterial diversity than the E-AnAOB. The most dominant genera in O-AnAOB were Anaerolineaceae (33.7%, fermentative bacteria), Candidatus Kuenenia (17.4%, anammox bacteria), and Nitrospira (7.3%, nitrite oxidizing bacteria). This study provided an insight into the new anammox process for deep nitrogen removal from wastewaters.
- Subjects
NITROGEN removal (Water purification); AMMONIUM; ANAEROBIC bacteria; OXIDATION; CANDIDATUS; GENETIC transcription; BACTERIAL diversity
- Publication
Applied Microbiology & Biotechnology, 2018, Vol 102, Issue 2, p995
- ISSN
0175-7598
- Publication type
Article
- DOI
10.1007/s00253-017-8587-8