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Selection of microalgae for simultaneous biogas upgrading and biogas slurry nutrient reduction under various photoperiods
Author(s) -
Wang Zhongwei,
Zhao Yongjun,
Ge Zhigang,
Zhang Hui,
Sun Shiqing
Publication year - 2016
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4788
Subject(s) - biogas , slurry , chlorella vulgaris , nutrient , selenastrum , biology , algae , pulp and paper industry , botany , environmental engineering , environmental science , ecology , engineering
BACKGROUND Five microalgal strains characterized by high biogas tolerance and rapid growth were cultured in biogas slurry to identify strains capable of simultaneous nutrient removal and biogas upgrading. The potential contribution of these algae to these processes was evaluated for different photoperiods. RESULTS The growth rates of the microalgae were inversely related to their initial concentrations. The growth rates of Scenedesmus obliquus ( FACHB ‐31), Chlorella vulgaris ( FACHB ‐416), and Nitzschia palea ( FACHB ‐211) were higher than those of Selenastrum capricornutum ( FACHB ‐271) and Anabaena spiroides ( FACHB ‐498) under a moderate photoperiod (14 h light: 10 h dark). Under this condition and an initial CH 4 concentration of 61.38% (v/v), the final concentrations in crude biogas were 84.28%, 84.21%, and 83.46% for S . obliquus , C. vulgaris , and N. palea , respectively. Biogas slurry nutrients were optimally reduced under the moderate photoperiod. CONCLUSION Appropriate selection of microalgal strains for the treatment of biogas slurry and crude biogas is crucial to achieve optimal nutrient removal and biogas upgrading. © 2015 Society of Chemical Industry