Zeolite biofilm aeration filter plays a pre-nitritation role in autotrophic nitrogen removal from iron oxide red wastewater

被引:2
|
作者
Feng, Xinghui [1 ,2 ,3 ]
Wang, Xiaojun [1 ,2 ,3 ]
Wang, Ruixin [1 ]
Zheng, Xuwen [1 ]
Zhong, Zhong [1 ]
Chen, Xiaozhen [1 ]
机构
[1] South China Univ Technol, Sch Environm & Energy, Guangzhou, Peoples R China
[2] Minist Educ, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Guangzhou, Peoples R China
[3] Hua An Biotech Co Ltd, Foshan, Peoples R China
关键词
pre-nitritation; zeolite; dissolved oxygen control; Anammox; granular sludge; MAINSTREAM PARTIAL NITRITATION; MICROBIAL COMMUNITY; START-UP; ANAMMOX BACTERIA; DISSOLVED-OXYGEN; CANON PROCESS; SLUDGE; AMMONIUM; PERFORMANCE; PH;
D O I
10.1002/jctb.6505
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
BACKGROUND The completely autotrophic nitrogen removal over nitrite (CANON) system has excellent performance in treating ammonium-rich wastewater and it depends on ammonia oxidizing bacteria (AOB) working together with anammox bacteria in a reactor. Higher ammonium nitrogen loading requires higher aeration to provide sufficient dissolved oxygen (DO) for nitritation, whereas high-strength aeration in theCANON will destroy the sludge structure and inhibit the activity of anammox bacteria. The present study uses a stable pre-nitritation system to reduce a part of nitritation and also decrease aeration intensity in the CANON. RESULTS Continuous aeration to maintain the DO concentration between 1.5 and 4.3 mg L(-1)in the CANON achieved a stable nitrogen removal rate (1.22 kg N m(-3)d(-1)) from iron oxide red wastewater with 400-1016 mg N L(-1)after 183 days of operation. Using a mixed alkalinity donor [sodium carbonate (Na2CO3) and bicarbonate (NaHCO3)] in the combined system can save approximate to 14.1-28.2% of the alkalinity cost compared with using NaHCO(3)only. CONCLUSIONS A zeolite biofilm aeration filter (ZBAF) used in a pre-nitritation process can tolerate high DO concentration of <= 6.5 mg L(-1)for nitritation and avoid all of the nitritation taking place in the CANON system. This can protect the sludge structure and anammox bacteria from high-strength aeration erosion. (c) 2020 Society of Chemical Industry
引用
收藏
页码:3261 / 3269
页数:9
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