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NOB suppression in partial nitritation-anammox (PNA) process by discharging aged flocs: Performance and microbial community dynamics by Jialin Li; Liang Zhang; Yongzhen Peng; Shenhua Yang; Xiaoling Wang; Xiyao Li; Qiong Zhang is a Environmental Science article available to read on EtoBox.
What is NOB suppression in partial nitritation-anammox (PNA) process by discharging aged flocs: Performance and microbial community dynamics about?
The partial nitritation-anammox (PNA) process is the most promising technique to treat municipal sewage; however, nitrite oxidizing bacteria (NOB) are a hindrance to achieve PNA. This study investigated the effects of selectively discharging flocs (<200 μm) to washout NOB in a sequencing batch reactor (SBR) over 200 d. The experiment was divided into three phases with different floc sludge retention times (SRTs; 30, 20 and 30 d). When the SRT of the flocs was reduced from 30 to 20 d to washout NOB, a significant reduction of ammonia oxidizing bacteria (AOB) and anaerobic ammonium-oxidizing (anammox) bacteria in the flocs was found. This indicates that a low floc SRT (20 d) leads to the loss of AOB and anammox bacteria in the flocs (<200 μm) and destroys PNA. Activity tests and qPCR analysis revealed the variations of functional bacteria in the granules and flocs, indicating that the enrichment of AOB, NOB, anammox bacteria in the granules is caused by the long-term discharging of flocs. High-throughput sequencing analysis revealed that the microbial shift of Tetrasphaera was significant in the flocs and may be connected to the enrichment of anammox bacteria and the stability of the
Who reads NOB suppression in partial nitritation-anammox (PNA) process by discharging aged flocs: Performance and microbial community dynamics?
It is typically read by researchers, students, and practitioners in Environmental Science.
- Author
- Jialin Li; Liang Zhang; Yongzhen Peng; Shenhua Yang; Xiaoling Wang; Xiyao Li; Qiong Zhang
- Publisher
- Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0045-6535)
- Published
- 2019
- Language
- EN
- Field
- Environmental Science (Physical Sciences)