Optimization and stability of single-stage anammox reactor
CHENG Jun1, ZHANG Liang2, YANG Yan-dong3, ZHANG Shu-jun2, PENG Yong-zhen1
1. Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China;
2. Research and Development Center of Beijing Drainage Group Co., Ltd., Beijing Wastewater Recycling Engineering Technology Research Center, Beijing 100022, China;
3. Harbin Institute of Technology, Harbin 150090, China
Key operational parameters of single-stage partial nitritation/anammox(PN/A) process was investigated to achieve higher nitrogen removal rate(NRR) and robustness by using a sequencing batch reactor(SBR)(120L) treating ammonia-rich wastewater. Long-term operation demonstrated that the maximum NRR of the reactor was 1.1kgN/(m3·d). The main parameters influenced the stability of the reactor were:free ammonia concentration, dissolved oxygen(DO) concentration and the relative proportions of the granules and flocs. The balance of AOB and anammox activity was the key to a robust single-stage PN/A operation. Excess discharge of floc sludge led to a decrease of ammonia oxidation rate and a high and inhibitory DO level to anammox bacteria, which eventually triggered the dramatic drop of NRR. The limiting factors of further improvement of NRR were:(1) sludge concentration stabilized due to biomass washout;(2) anammox and AOB activity could not be promoted simultaneously when further increasing DO levels;(3) mass transfer could not be further enhanced. Furthermore, NRR showed strong correlation with aeration rate in this study. Therefore, aeration rate could be an alternative regulating parameter under fluctuating influent load.
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