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Municipal Wastewater Enriched with Trace Metals for Enhanced Lipid Production of the Biodiesel-Promising Microalga Scenedesmus obliquus

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Abstract

In the present study, the effect of trace metal nutrients on biomass and lipid productivity of Scenedesmus obliquus cultured in municipal wastewater was evaluated. Lipid productivity of S. obliquus significantly increased by 18.63%, 19.21%, and 27.95% by adding trace metals of Mo, Mn, and Fe, respectively, with the highest lipid productivity of 24.69 mg/(L·d) in case of Fe (3.00 mg/L FeSO4·7H2O). GC analysis of the lipids showed that the control (WW) and ferrous sulfate–treated cultures had very similar compositions, and both of them contained considerable proportions C16-18, showing their suitability for biodiesel production. Moreover, using FeSO4·7H2O enhanced the removal rates of total phosphorus, ammonia nitrogen, and total nitrogen in municipal wastewater, which attained 94.7%, 99.2%, and 95.8%, respectively.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 51878215), Natural Science Foundation of Guangdong Province, China (2018A030313185), and Shenzhen Science and Technology Innovation Project (KJYY20171011144235970, JCYJ20170307150223308).

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Correspondence to Xu Zhou.

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Han, SF., Jin, W., Abomohra, A.EF. et al. Municipal Wastewater Enriched with Trace Metals for Enhanced Lipid Production of the Biodiesel-Promising Microalga Scenedesmus obliquus. Bioenerg. Res. 12, 1127–1133 (2019). https://doi.org/10.1007/s12155-019-10042-5

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