Journal
CHEMOSPHERE
Volume 228, Issue -, Pages 536-544Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.04.152
Keywords
Microalgae; Heterotrophic; Cr(VI); Organics; Wastewater; Bioremoval
Categories
Funding
- National Natural Science Foundation of China [21736009]
- Natural Science Foundation of Fujian Province of China [2018J01016]
- Natural Science Foundation of Fujian Provincial University Youth Key Program of China [JZ160401]
- Science and Technology Program of Xiamen, China [3502Z20173018]
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Considering the importance of removing toxic Cr(VI) from practical wastewater containing complex pollutants, this study presented for the first time the utilization of the live heterotrophic microalgae (Botryocossuss sp. NJD-1) to achieve a concurrent abatement of Cr(VI), TOC, NO3-N and PO4-P, through a comprehensive biochemical process. The experimental results showed that the Cr(VI) removal efficiencies in the culture with different types of organic descended in the order of sodium acetate, ethanol and methanol. The highest removal efficiencies were achieved as 94.2%, 98.2%, 66.9% and 99.2% for Cr(VI), TOC, NO3-N and PO4-P, respectively, in the culture with 5 mg L-1 Cr(VI) and sodium acetate of equivalent to 2.92 gC L-1. Through mass balance calculation and characterization, the fate of Cr(Vl) and Cr(III) was tracked and quantified in the culture system, which indicates that 87.17% of initial Cr(Vl) were reduced to Cr(Ill) and then adsorbed in algal biomass for the optimal removal case. Consequently, the mechanism demonstrating the correlation among the removal process of Cr(VI), the biological activity of microalgae and the effect of organic compounds was proposed. (C) 2019 Elsevier Ltd. All rights reserved.
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