TY - JOUR
T1 - Development of an algal treatment system for selenium removal
T2 - Effects of environmental factors and post-treatment processing of Se-laden algae
AU - Liu, Fang
AU - Huang, Jung Chen
AU - Zhou, Chuanqi
AU - Gao, Wenqiao
AU - Xia, Shaofeng
AU - He, Shengbing
AU - Zhou, Weili
N1 - Funding Information:
We thank Shanghai Synchrotron Radiation Facility (SSRF) for the beam time (#15ssrf01403) granted for the Se speciation analysis on the Beamline 14W1. This research was supported by funds from the National Natural Science Foundation of China [grant No. 51479110 ] and the Project of Science and Technology Applied in the Construction of Anhui Province [grant No. 2015YF-16 ]. We also thank the laboratory staff of the School of Environmental Science and Engineering at Shanghai Jiao Tong University for Se analysis.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/3/5
Y1 - 2019/3/5
N2 - In developing an algal treatment system, selenium (Se) removal efficiency by Chlorella vulgaris was evaluated under various conditions such as Se concentration, algal density, temperature and pH. A maximum removal efficiency plateau of ∼90% was observed between 1000–3000 μg Se/L while the tolerance of Se toxicity was found at 6000 μg Se/L. C. vulgaris of 0.75 g DW/L showed the highest removal efficiency (84%), and volatilization was dominant below 1.37 g DW/L. Se volatilization was two times higher at 25 °C than at 20 °C in the first 24 h. Moreover, the highest removal efficiency (77%) was obtained at pH 8.0, compared to 66.5% at pH 6.5 and 40% at pH 10.0. To prevent ecotoxicity, Se laden algae were further burned to ashes or filtered out by Anodonta woodiana. After burning, biomass Se was reduced by 99%, with organo-Se entirely converted into inorganic Se, lowering Se bioavailability. A. woodiana removed 54% of Se in 24 h, leading to Se bioaccumulation in soft tissues, which may serve as dietary Se supplements for human health. Our results suggest the cleanup of Se-contaminated water from either agricultural runoff or industrial discharge could be achieved using an algal treatment system with minimum potential ecotoxicity.
AB - In developing an algal treatment system, selenium (Se) removal efficiency by Chlorella vulgaris was evaluated under various conditions such as Se concentration, algal density, temperature and pH. A maximum removal efficiency plateau of ∼90% was observed between 1000–3000 μg Se/L while the tolerance of Se toxicity was found at 6000 μg Se/L. C. vulgaris of 0.75 g DW/L showed the highest removal efficiency (84%), and volatilization was dominant below 1.37 g DW/L. Se volatilization was two times higher at 25 °C than at 20 °C in the first 24 h. Moreover, the highest removal efficiency (77%) was obtained at pH 8.0, compared to 66.5% at pH 6.5 and 40% at pH 10.0. To prevent ecotoxicity, Se laden algae were further burned to ashes or filtered out by Anodonta woodiana. After burning, biomass Se was reduced by 99%, with organo-Se entirely converted into inorganic Se, lowering Se bioavailability. A. woodiana removed 54% of Se in 24 h, leading to Se bioaccumulation in soft tissues, which may serve as dietary Se supplements for human health. Our results suggest the cleanup of Se-contaminated water from either agricultural runoff or industrial discharge could be achieved using an algal treatment system with minimum potential ecotoxicity.
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U2 - 10.1016/j.jhazmat.2018.11.017
DO - 10.1016/j.jhazmat.2018.11.017
M3 - Article
C2 - 30469034
AN - SCOPUS:85056768375
SN - 0304-3894
VL - 365
SP - 546
EP - 554
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -