PubAg

Main content area

Nutrient removal and biogas upgrading by microalgal strains cultured in anaerobic digested starch wastewater

Author:
Cheng, Bin, Ge, Zhigang, Zhang, Hui, Zhao, Yongjun, Sun, Shiqing, Hu, Changwei
Source:
Journal of chemical technology and biotechnology 2016 v.91 no.12 pp. 3028-3034
ISSN:
0268-2575
Subject:
Chlorella vulgaris, biogas, biomass, chemical oxygen demand, microalgae, nitrogen content, phosphorus, pollutants, starch, wastewater
Abstract:
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
Agid:
5717580