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- Title
强化型硫铁矿自养反硝化工艺深度处理城市二沉尾水研究.
- Authors
李 明 礼; 高 彦 宁; 黄 丹; 徐 晓 晨; 陈 捷; 杨 凤 林
- Abstract
In order to realize rapid start-up of pyrite-based autotrophic denitrification (PAD) process and improve effluent stability, biofilter reactor (No.1 reactor) depending on sulfur-based autotrophic denitrification (SAD) process filled with pyrite is used as a control, enhanced pyrite-based biofilter reactors (No.2 and No.3 reactors) are respectively established filled with pyrite/limestone and pyrite/sulfur to treat the secondary effluent of municipal wastewater treatment plant. The feasibility of the two enhanced processes is evaluated from the perspective of both removal efficiency and effluent quality, and the microbial community analysis is used to explore the enhancement mechanism of the enhanced processes. The results show that with the reaction temperature of 31-33 ℃ and hydraulic retention time (HRT) of 2.2 h, the total nitrogen (TN) removal efficiencies of the three biofilter reactors are 91.3% (No.1 reactor), 84.5% (No.2 reactor) and 100% (No.3 reactor), respectively, the TN concentration of the effluent is less than 5 mg/L; the total phosphorus (TP) removal efficiencies are 91.4% (No.1 reactor), 85.0% (No.2 reactor) and 100% (No.3 reactor), respectively, and the TP removal performance is positively correlated with the TN removal performance. The effluent pH of the three biofilter reactors is ranged from 6.8 to 7.6. The sulfate radical production in all biofilter reactors is low and maintains at 4.99-5.91 mg (per mg NO-3-N). The higher relative abundance of Thiobacillus, the core functional bacteria of pyrite-based autotrophic denitrification process, occurs in the No.3 reactor. In conclusion, biofilter reactor filled with pyrite/sulfur can not only achieve fast start-up, but also achieve good nitrogen and phosphorus removal efficiencies, and the effluent quality is stable, which provides a theoretical basis for practical application of SAD technology in advanced treatment of municipal secondary effluent.
- Subjects
EFFLUENT quality; SEWAGE disposal plants; AUTOTROPHIC bacteria; BIOFILTERS; RF values (Chromatography); FAST reactors
- Publication
Journal of Dalian University of Technology / Dalian Ligong Daxue Xuebao, 2023, Vol 63, Issue 5, p454
- ISSN
1000-8608
- Publication type
Article
- DOI
10.7511/dllgxb202305003