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Nutrient removal and biogas upgrading by microalgal strains cultured in anaerobic digested starch wastewater
Author(s) -
Cheng Bin,
Ge Zhigang,
Zhang Hui,
Zhao Yongjun,
Sun Shiqing,
Hu Changwei
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.4929
Subject(s) - chemical oxygen demand , serial dilution , chlorella vulgaris , biogas , wastewater , nutrient , biomass (ecology) , anaerobic digestion , pulp and paper industry , chemistry , phosphorus , biochemical oxygen demand , food science , environmental chemistry , biology , botany , environmental engineering , environmental science , agronomy , algae , ecology , methane , alternative medicine , organic chemistry , pathology , medicine , engineering
BACKGROUND In this study, the microalga Chlorella vulgaris ( FACHB ‐38) was cultivated in pure (3122.5 mg L −1 chemical oxygen demand ( COD )) and diluted anaerobic digested starch wastewater ( ADSW ; 313.2, 622.8, 935.7, 1248.5, and 1558.9 mg L −1 COD ). This study mainly aimed to compare algal growth and tolerance with various dilutions of ADSW , as well as determine nutrient removal efficiency and role of biogas upgrade. RESULTS Chlorella vulgaris cultured in ADSW with 935.7 mg L −1 COD yielded a maximum total biomass of 3.39 ± 0.27 g L −1 (dry weight) and pollutant removal efficiencies of 79.04% ± 5.71% COD and 73.19% ± 6.98% total nitrogen ( TN ). The contents of C, N, and P in biomass remained constant at 48.93–50.12%, 8.76–9.94%, and 0.74–0.98%, respectively, among all dilutions. High total phosphorus ( TP ) removal efficiency was observed in treatments with 1248.5–1558.9 mg L −1 COD . The most appropriate dilutions for biogas upgrade were 935.7 and 1248.5 mg L −1 COD . CONCLUSION The optimal effect of nutrient removal and biogas upgrading can be obtained by appropriate control of ADSW dilution in influents. © 2016 Society of Chemical Industry