Factors affecting performance and functional stratification of membrane-aerated biofilms with a counter-diffusion configuration

doi:10.1039/c9ra03128f

	Factors affecting performance and functional stratification of membrane-aerated biofilms with a counter-diffusion configuration
	Li, Tinggang 2; Liu, Junxin 1
刊名	RSC ADVANCES
	2019-09-17
卷号	9 期号:50 页码:29337-29346
DOI	10.1039/c9ra03128f
英文摘要	Membrane-aerated biofilms (MABs) developed with a novel counter-diffusion configuration in oxygen and substrate supply were examined for the effect of biofilm thickness on the functional activity and microbial community structure of the biofilm with the simultaneous degradation of acetonitrile, and nitrification and denitrification. Results demonstrated that different biofilm thicknesses under different surface loading rates (SLRs) caused substantially varied profiles of the microbial activities with distinct functions in the biofilm. Both thick and thin MABs achieved high-rate performance in terms of acetonitrile removal (>99%), but the performance differed in the removal efficiencies of total nitrogen (TN), which was 1.3 times higher in the thick MAB (85%) than in the thin MAB (36.3%). The specific ammonia-oxidizing rate (SAOR) and the specific acetonitrile-degrading rate (SADR) exhibited similar declining and ascending trends in both the thin and thick MABs, respectively. In contrast, the specific denitrifying rate (SDNR) was relatively uniform at a concentration near the detection limit in the thin MAB but exhibited a hump-shaped variation with the highest rate occurring in an intermediate region in the thick MAB. Microbial community analysis revealed a dramatic shift in the dominant bacteria of the community composition with low diversity across the biofilm. This study suggests that the biofilm thickness developed under SLRs, which controls the mass transfer of oxygen and substrates into biofilms, is an important factor affecting the structural and functional stratification of bacterial populations in a single MAB treating organonitrile wastewater.
资助项目	National Natural Science Foundation of China[50978246] ; National Natural Science Foundation of China[51138009]
WOS关键词	GRADIENT GEL-ELECTROPHORESIS ; WASTE-WATER TREATMENT ; NITROGEN REMOVAL ; SIMULTANEOUS NITRIFICATION ; COMMUNITY STRUCTURE ; OXIDIZING BACTERIA ; REACTOR ; ACETONITRILE ; DEGRADATION ; BIOREACTOR
WOS研究方向	Chemistry
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000487104200050
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/31048]
专题	中国科学院过程工程研究所
通讯作者	Li, Tinggang; Liu, Junxin
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Li, Tinggang,Liu, Junxin. Factors affecting performance and functional stratification of membrane-aerated biofilms with a counter-diffusion configuration[J]. RSC ADVANCES,2019,9(50):29337-29346.
APA	Li, Tinggang,&Liu, Junxin.(2019).Factors affecting performance and functional stratification of membrane-aerated biofilms with a counter-diffusion configuration.RSC ADVANCES,9(50),29337-29346.
MLA	Li, Tinggang,et al."Factors affecting performance and functional stratification of membrane-aerated biofilms with a counter-diffusion configuration".RSC ADVANCES 9.50(2019):29337-29346.