期刊
BIORESOURCE TECHNOLOGY
卷 323, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124524
关键词
COD/NO3- ratio; Partial denitrification; Nitrite accumulation; DPR sludge; Microbial community
资金
- Natural Science Foundation of China [51808482]
- Postdoctoral Science Foundation of China [2018M632392]
The study investigated the effect of influent COD/NO3- ratios on partial denitrification, showing that higher ratios led to improved denitrification efficiency and nitrate removal. Microbial analysis indicated lower diversity and more concentrated microbial communities at a specific COD/NO3- ratio.
Effect of influent COD/NO3- ratios (2.0-5.0) on partial denitrification (PD, NO3- to NO2-) was investigated by seeding denitrifying phosphorus removal (DPR) sludge at ambient temperature (16 +/- 2celcius). At COD/NO3- ratio of 2.5, the optimal NO2- effluent and nitrate-to-nitrite transformation ratio (NTR) reached up to 27.18 mg/L and 82.18%, respectively, and nitrate removal efficiency (NRE) (59.34 -> 97.98%) showed positive relationship with increasing COD/NO3- ratios. The variations were further illustrated by denitrification kinetics, where faster COD degradation (1.55 g COD/(gVSS.d)), more NO3- consumption (0.55 gN/(gVSS.d)) and higher NO2- production (0.52 gN/(gVSS.d)) were observed although the NO2- peaks happened at anoxic 30 min. Microbial analysis showed lower community diversity and more concentrated composition with dominated genera Thauera (14.10%), Terrimonas (9.40%), Saprospiraceae (13.50%) and Flavobacterium (28.23%) at COD/NO3- ratio of 2.5. Based on the achievement of PD, the application feasibility of integrated PD-DPR-Anammox in a two-sludge DPR system for deep-level nutrient removal was discussed.
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