Journal
WATER RESEARCH
Volume 176, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2020.115736
Keywords
Membrane aeration; Bacteria-algae; Biofilm structure; Organic carbon; Bubble-free
Funding
- National Key Research and Development Program of China [2018YFC0408001]
- National Natural Science Foundation of China [51778170]
- State Key Laboratory of Urban Water Resource and Environment [2019DX01]
- Fundamental Research Funds for the Central Universities
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In the bacteria-algae (BA) system, the amount of oxygen produced by the algae is always insufficient for the organic carbon degradation, resulting in less inorganic carbon (IC) production. Meanwhile, the conventional extra aeration method always causes CO2 stripping and IC loss. Both two reasons limited the algae boosting. Membrane aeration (MA) has the excellent capability of organic carbon thorough degradation and gas blown-off control. In this study, MA-BA was employed to investigate the effect of organic carbon on the algae growth. Results showed that COD had a positive correlation with Chlorophyll-alpha (Chl-alpha) and algae proliferation in MA-BA system according to the redundancy analysis (RDA). The biggest Chl-alpha concentration (20.95 mg/cm(2)) occurred in R-4 (COD = 400 mg/L). Stimulated algal population changed nutrient removal pathway from bacterial action to algae action. Meantime, Soared algae accumulation would selectively excite the abundance of bacteria that supported the algae growth, such as Acinetobacter, which exhibited a growing trend as the increase of influent COD, especially in the inner biofilm. This paper provided new insight into the effect of organic carbon on the algae in a novel MA-BA system, which will be helpful for future research. (C) 2020 Elsevier Ltd. All rights reserved.
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