Isolation of microalgal strain from algal-bacterial aerobic granular sludge and examination on its contribution to granulation process during wastewater treatment in respect of nutrients removal, auto-aggregation capability and EPS excretion

被引：24

作者：

Nuramkhaan M. ^{[1
]}

Zhang Y. ^{[1
]}

Dong X. ^{[1
]}

Huang W. ^{[2
]}

Lei Z. ^{[1
]}

Shimizu K. ^{[1
]}

Zhang Z. ^{[1
]}

Utsumi M. ^{[1
]}

Lee D.-J. ^{[3
,4
]}

机构：

[1] Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8572, Ibaraki

[2] Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, No. 92, Weijin Road, Nankai District, Tianjin

[3] Department of Chemical Engineering, National Taiwan University, Taipei

[4] Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei

来源：

Bioresource Technology Reports | 2019年 / 8卷

基金：

中国国家自然科学基金; 日本学术振兴会;

关键词：

Algal-bacterial aerobic granular sludge; Auto-aggregation; Granule formation; Microalgae; Nutrients removal;

D O I：

10.1016/j.biteb.2019.100330

中图分类号：

学科分类号：

摘要：

Nutrients removal together with auto-aggregation capability of an isolated microalgal strain Chlorella sp. A-1 from mature algal-bacterial granules was examined under illumination at a light/dark cycle of 12 h/12 h or 0 h/24 h. Then its contribution to granulation process was evaluated in sequencing bath reactors(SBRs). The strain Chlorella sp. A-1 with a fast biomass growth and high auto-aggregation index(82.4% on day 5) achieved 93–96% of N and P removals when treating wastewater containing 50 mg-NH4-N/l and 5 mg-PO4-P/l after 5-day cultivation at the light/dark cycle of 12 h/12 h. The inoculated strain Chlorella sp. A-1 in SBRs was observed to help the fluffy activated sludge to transform into a little bit tight structure initiating the formation of algal-bacterial granules. Total extracellular polymeric substances(EPS), especially tightly bound EPS excreted from the strain was found to contribute more to algal aggregation. The isolated Chlorella sp. A-1 is probably the crucial biological factor for algal-bacterial granule formation. © 2019 Elsevier Ltd

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