期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 415, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125568
关键词
Partial denitrification (PD); Two-stage Anammox; Sludge fermentation liquid; Partial nitrification (PN); Landfill leachate
资金
- 111 Project [D16003]
- R&D Program of Beijing Municipal Education Commission
Combining SFL-driven PD with two-stage Anammox process improved nitrogen removal efficiency and rate, with a high nitrate to nitrite transformation ratio achieved. Key genera related to degradation of SBO, PD, and Anammox were enriched, showing a novel insight for advanced nitrogen removal.
The two-stage partial nitrification (PN)-Anammox process, during long term treatment of high-ammonia nitrogen leachate, faces challenges such as the adaptation of nitrite oxidation bacteria (NOB) and failure of real-time control of pH. Resultant instabilities including NH4+-N and NO3- -N accumulation were overcome by culturing sludge fermentation liquid (SFL)-driven partial denitrification (PD) in situ in the Anammox process. Biodegradation of slowly biodegradable organics (SBO) in SFL created organics restriction condition, which limited the activity of denitrification bacteria and achieved its balance with Anammox bacteria. Produced NO3- -N is reduced to NO2- -N through PD, which further improved the removal of NH4+-N through Anammox. NO2- -N was utilized timely by Anammox bacteria, which avoid further reduction of NO2- -N to N2, and result in a high nitrate to nitrite transformation ratio (NTR) of 93.3%. Satisfactory nitrogen removal efficiency (NRE) and nitrogen removal rate (NRR) of 99.6% and 822.0 +/- 9.0 g N/(m3 center dot d) were obtained, respectively. Key genera related to degradation of SBO, PD and Anammox were enriched. The value of narG/(nirK+nirS) increased from 0.05 on day 1-0.15 on day 250. Combining SFL-driven PD with two-stage Anammox process provided a novel insight for applying this process to realize advanced nitrogen removal in practical engineering.
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