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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

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2018 Impact Factor: 3.883

Front. Environ. Sci. Eng.    2019, Vol. 13 Issue (6) : 92    https://doi.org/10.1007/s11783-019-1176-6
RESEARCH ARTICLE
A novel sequence batch membrane carbonation photobioreactor developed for microalgae cultivation
Caiyun Hou, Sen Qiao(), Yue Yang, Jiti Zhou
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
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Abstract

A novel SBM-C-PBR was constructed for microalgae cultivation.

Membrane fouling was greatly mitigated by membrane carbonation.

NH4+ and P removal rates were around 80% in SBM-C-PBR.

Biomass was completely retained by membrane.

In this study, a novel sequence batch membrane carbonation photobioreactor was developed for microalgae cultivation. Herein, membrane module was endowed functions as microalgae retention and CO2 carbonation. The results in the batch experiments expressed that the relatively optimal pore size of membranes was 30 nm, photosynthetically active radiation was 36 W/m2 and the CO2 concentration was 10% (v/v). In long-term cultivation, the microalgal concentration separately accumulated up to 1179.0 mg/L and 1296.4 mg/L in two periods. The concentrations of chlorophyll a, chlorophyll b and carotenoids were increased about 23.2, 14.9 and 6.3 mg/L respectively in period I; meanwhile, the accumulation was about 25.0, 14.5, 6.6 mg/L respectively in the period II. Furthermore, the pH was kept about 5.5–7.5 due to intermittent carbonation mode, which was suitable for the growth of microalgae. Transmembrane pressure (TMP) was only increased by 0.19 and 0.16 bar in the end of periods I and II, respectively. The pure flux recovered to 75%–80% of the original value by only hydraulic cleaning. Scanning electron microscope images also illustrated that carbonation through membrane module could mitigate fouling levels greatly.

Keywords Membrane carbonation      SBM-C-PBR      Cultivate microalgae      Membrane fouling     
Corresponding Author(s): Sen Qiao   
Issue Date: 29 November 2019
 Cite this article:   
Caiyun Hou,Sen Qiao,Yue Yang, et al. A novel sequence batch membrane carbonation photobioreactor developed for microalgae cultivation[J]. Front. Environ. Sci. Eng., 2019, 13(6): 92.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-019-1176-6
https://academic.hep.com.cn/fese/EN/Y2019/V13/I6/92
Batch experiments Membrane pore size (nm) Light intensity (W/m2) CO2 concentration (%)
1 300 12 20
2 100 12 20
3 30 12 20
4 30 24 20
5 30 36 20
6 30 36 40
7 30 36 10
Tab.1  The exploration of influencing factors in batch experiments
Fig.1  The schematic diagrams of batch and long-term experiment reactor.
Fig.2  Microalgal growth and pigments concentration under different pore sizes.
Fig.3  Microalgal growth and pigments concentration under different light intensities.
Fig.4  Microalgal growth and pigments concentration under different CO2 concentrations.
Fig.5  Microalgal growth and pigments concentration in long-term experiment.
Fig.6  The removal of NH4+ and P by microalgae.
Fig.7  Variation of TMP and flux in long-term experiment.
Fig.8  SEM images: (a) is control membrane; (b) (c) are membrane after two periods.
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