期刊
JOURNAL OF WATER PROCESS ENGINEERING
卷 47, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jwpe.2022.102669
关键词
Biological nitrogen removal; Granular sludge; Anammox; Autotrophic denitrification; Sulfur-oxidizing bacteria
资金
- National Innovation Talent Promotion Program of the Ministry of Science and Technology of the People's Re-public of China [2017RA2251]
- Creative Research Groups in Colleges and Universities of Chongqing (Water Environment Protection and Management in Mountainous City)
Recent studies have focused on the TDDA process for treating wastewater containing ammonium and nitrate. By operating two different-sized reactors, it was found that bigger aggregates provided nitrite more efficiently for anammox process, resulting in higher nitrogen removal efficiency.
Recent studies have paid attention to thiosulfate-driven denitrification and anammox (TDDA) process on treating ammonium and nitrate contained wastewater. However, technical challenges still existed in coupling denitratation and reducing denitritation to obtain efficient nitrite supply for anammox. By successfully operated two anoxic sequencing batch reactors (ASBR) with two different sizes of TDDA aggregates, the reactor R1 with smaller aggregates (0.195 mm) achieved 83.38% ammonium removal efficiency and 85.39% total nitrogen removal efficiency. In comparison, the reactor R2 with bigger aggregates (0.554 mm) achieved higher ammonium removal efficiency (92.02%) and total nitrogen removal efficiency (90.05%). Different aggregates showed a similar anammox activity and denitratation activity but varied in denitritation activity (3.47 mg/(L center dot h) in R1 compared to 1.42 mg/(L center dot h) in R2), indicating bigger aggregates supplied nitrite to anammox process more efficiently. Annwoodia was the pivotal microorganism involved in nitrite acquisition that outcompeted anammox bacteria in smaller aggregates. Bigger aggregates with the less relative abundance of Annwoodia established a more harmonious microbial community to support effective nitrogen removal. This study provides a novel insight into nitrite utilization of TDDA system and sheds light on the operation of ASBR-based TDDA processes for biological nitrogen removal.
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