Assessment of the mechanisms involved in the removal of emerging contaminants by microalgae from wastewater: a laboratory scale study

JOURNAL OF HAZARDOUS MATERIALS

卷:301

Article

Matamoros, Victor¹  Uggetti, Enrica²  Garcia, Joan²  Bayona, Josep M.¹ 

[1] IDAEA CSIC, Dept Environm Chem, E-08034 Barcelona, Spain

[2] Univ Politecn Catalunya BarcelonaTech, Dept Hydraul Maritime & Environm Engn, GEMMA Grp Environm Engn & Microbiol, E-08034 Barcelona, Spain

关键词: Emerging organic contaminants;    Wastewater;    Removal;    Microalgae;    Biodegradation;    Volatilization;   

DOI  :  10.1016/j.jhazmat.2015.08.050

来源: Elsevier

【 摘 要 】

Aerated batch reactors (2.5 L) fed either with urban or synthetic wastewater were inoculated with microalgae (dominated by Chlorella sp. and Scenedesmus sp.) to remove caffeine, ibuprofen, galaxolide, tributyl phosphate, 4-octylphenol, tris(2-chloroethyl) phosphate and carbamazepine for 10 incubation days. Non-aerated and darkness reactors were used as controls. Microalgae grew at a rate of 0.25 d(-1) with the complete removal of N-NH4 during the course of the experiment. After 10 incubation days, up to 99% of the microcontaminants with a Henry's law constant higher than 3 10(-1) Pa m(3) mol(-1) (i.e., 4-octylphenol, galaxolide, and tributyl phosphate) were removed by volatilization due to the effect of air stripping. Whereas biodegradation was effective for removing ibuprofen and caffeine, carbamazepine and tris(2-chloroethyl) phosphate behaved as recalcitrant compounds. The use of microalgae was proved to be relevant for increasing the biodegradation removal efficiency of ibuprofen by 40% and reducing the lag phase of caffeine by 3 days. Moreover, the enantioselective biodegradation of S-ibuprofen suggested a biotic prevalent removal process, which was supported by the identification of carboxy-ibuprofen and hydroxy-ibuprofen. The results from microalgae reactors fed with synthetic wastewater showed no clear evidences of microalgae uptake of any of the studied microcontaminants. (C) 2015 Elsevier B.V. All rights reserved.

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