Recovering biological nitrogen removal in pilot-scale variable-velocity oxidation ditch under low concentration

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	Recovering biological nitrogen removal in pilot-scale variable-velocity oxidation ditch under low concentration
	Yang, Ya-Hong 1,2; Peng, Dang-Cong 2; Li, Lei 2; Zheng, Yang-Guang 2; Zhang, Xin-Yan 2; Pei, Li-Ying 2
刊名	Zhongguo Huanjing Kexue/China Environmental Science
	2013-03-01
卷号	33 期号:3 页码:436-442
关键词	Aerobic bacteria Denitrification Effluents Nitrification Nitrogen removal Sewage lagoons Sewage sludge Temperature Denitrifying M. parvicella Nitrifying Sludge bulking Sludge settleability
ISSN号	10006923
英文摘要	Activated sludge bulking, mainly caused by filamentous bacteria-Microthrix Parvicella, was one of the most important reasons in activated sludge process under low temperature. This study was aimed at resolving the problem of sludge bulking and low nitrification ability caused by low temperature, low DO and low influent loading in a variable-velocity oxidation ditch pilot with fine bubble. Experiments results showed that taking the whole DO tank as aerobic zone was benefit for improving nitrifying bacteria content and meeting effluent NH4+-N concentration below 5 mg/L. And then A:O ratios of 0, 0.1, 0.5, 1.1, 1.8 were gradually increased the quantity of nitrifying bacteria quickly in accordance with above the standard of effluent NH4+-N. Also identifying filamentous bacteria showed that dominant microorganism was M. Parvicella with hydrophobicity. Flocs with mass M. Parvicella was floated due to denitrifying nitrogen and formed foaming on the surface of selector and OD. After the foaming was ripped off in order to decrease the quantity of M. Parvicella, nitrifying as increasing the quantity of nitrifying bacteria was improved. The further analysis of nitrification and denitrification performance under different activated sludge contents of M. parvicella showed that M. parvicella was benificial to denitrifying and adverse to nitrifying.It also showed that M. parvicella the maijor reason of impacting nitrifying, denitrifying and sludge settleability except for DO concentration, water temperature and influent load.
语种	中文
出版者	Chinese Society for Environmental Sciences
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/113460]
专题	土木工程学院
作者单位	1.College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2.School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
推荐引用方式 GB/T 7714	Yang, Ya-Hong,Peng, Dang-Cong,Li, Lei,et al. Recovering biological nitrogen removal in pilot-scale variable-velocity oxidation ditch under low concentration[J]. Zhongguo Huanjing Kexue/China Environmental Science,2013,33(3):436-442.
APA	Yang, Ya-Hong,Peng, Dang-Cong,Li, Lei,Zheng, Yang-Guang,Zhang, Xin-Yan,&Pei, Li-Ying.(2013).Recovering biological nitrogen removal in pilot-scale variable-velocity oxidation ditch under low concentration.Zhongguo Huanjing Kexue/China Environmental Science,33(3),436-442.
MLA	Yang, Ya-Hong,et al."Recovering biological nitrogen removal in pilot-scale variable-velocity oxidation ditch under low concentration".Zhongguo Huanjing Kexue/China Environmental Science 33.3(2013):436-442.