期刊
CHEMOSPHERE
卷 248, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.126094
关键词
Hybrid system; Absorption; Microalgae; Wastewater; Bicarbonate; Chlorella sp
资金
- National Key Research and Development Program-China [2017YFE0127200]
- National Natural Science Foundation of China [21878228, 31701526]
- Young Elite Scientists Sponsorship Program by Tianjin City [TJSQNTJ-2017-03]
- Tianjin Science and Technology Program Project [19YFHBQY00020]
- International Cooperation Research Centre of Carbon Capture in Ultra-low Energy-consumption (Tianjin)
Microalgae have been considered as promising alternative for CO2 fixation and wastewater purification. In our previous work, a hybrid microalgae CO2 fixation concept has been put forward, which initially used carbonate solution absorb CO2, and then provided obtained bicarbonate as nutrition for microalgae growth to avoid the challenge of low CO2 solubility and carbon fixation efficiency in the conventional process. In this work, the proposed hybrid system was further intensified via integrating soybean wastewater nutrition removal with bicarbonate-carbon (NH4HCO3 and KHCO3) conversion. The investigation results indicated that the maximum biomass productivity (0.74 g L-1) and carbon bioconversion efficiency (46.9%) were achieved in low-NH4HCO3 concentration system with pH adjusted to 7. pH adjustment of different bicarbonate systems also enhanced total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (COD) removal efficiency up to 87.5%, 99.5% and 77.6%, respectively. In addition, maximum neutral lipid (14.4 mg L-1.d(-1)) and polysaccharide (14.5 mg L-1.d(-1)) productivities could be obtained in the KHCO3 systems, while higher crude protein productivity (48.1 mg L-1.d(-1)) was yielded in the NH4HCO3 systems. (C) 2020 Elsevier Ltd. All rights reserved.
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