DOI: 10.1016/j.watres.2018.09.016
Scopus记录号: 2-s2.0-85053796911
论文题名: Evaluation of trophic transfer in the microbial food web during sludge degradation based on 13C and 15N natural abundance
作者: Onodera T. ; Kanaya G. ; Hatamoto M. ; Kohzu A. ; Iguchi A. ; Takimoto Y. ; Yamaguchi T. ; Mizuochi M. ; Syutsubo K.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 146 起始页码: 30
结束页码: 36
语种: 英语
英文关键词: Activated sludge
; Carbon stable isotope ratio (δ13C)
; Endogenous conditions
; Food web
; Nitrogen stable isotope ratio (δ15N)
; Trophic transfer
英文摘要: Carbon and nitrogen stable isotope ratios (δ13C and δ15N) were determined in activated sludge, which was exposed to endogenous conditions for 36 days and contained a wide diversity of organisms across several trophic levels. The aim of this study was to elucidate the fluctuation of δ13C and δ15N through trophic transfer in the microbial consortia. The sludge was evaluated in view of sludge mass, bacterial community, higher trophic organisms, sludge δ13C and δ15N, and δ15N and δ18O of nitrate. The results show that the activated sludge became more enriched with 15N as degradation proceeded. Eventually, the mixed liquor volatile suspended solid concentrations in the activated sludge decreased from 1610 to 710 mg/L and the δ15N of the sludge increased from 8.3‰ to 10.8‰. In contrast, the δ13C values of the sludge were stable. Microscope observations confirmed that consumers such as Rotifera, Tardigrada and Annelida (Aelosoma sp.) were present in the activated sludge for the entire operational period. The abundance of those organisms drastically changed during the operational periods, and the diversity in bacterial community also changed, resulting in community succession. Changes in biotic community, reduction in sludge mass, and increase in δ15N of the sludge occurred during the sludge degradation processes. This implies that the sludge degradation was partly caused by the trophic conversion of the sludge-derived nitrogen in the food web. The δ15N of the sludge can be used as an indicator of the sludge degradation through trophic transfer in wastewater treatment reactors. These findings provide new insights into understanding trophic transfer during microbial community succession and the effects of the feeding process on sludge degradation. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112391
Appears in Collections: 气候减缓与适应
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作者单位: Center for Regional Environmental Research, National Institute for Environmental Studies, 16−2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan; Department of Civil and Environmental Engineering, Nagaoka University of Technology, 1603−1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan; Faculty of Applied Life Sciences, Niigata University of Pharmacy and Applied Life SciencesNiigata 956-0841, Japan
Recommended Citation:
Onodera T.,Kanaya G.,Hatamoto M.,et al. Evaluation of trophic transfer in the microbial food web during sludge degradation based on 13C and 15N natural abundance[J]. Water Research,2018-01-01,146