TY - JOUR
T1 - Biosorption of nanoparticles to heterotrophic wastewater biomass
AU - Kiser, Mehlika A.
AU - Ryu, Hodon
AU - Jang, Hyunyoung
AU - Hristovski, Kiril
AU - Westerhoff, Paul
N1 - Funding Information:
Although the research described in the present study has been funded in part by the U.S. Environmental Protection Agency through a grant/cooperative agreement ( RD831713 and RD833322 ), it has not been subjected to the Agency’s required peer and policy review. Therefore, it does not necessarily reflect the views of the Agency, and no official endorsement should be inferred. Additional funding was provided by the Paul L. Busch Research Award from the Water Environment Research Foundation and the Emerging Contaminants Research Group at Arizona State University . Dr. Page Baluch of the W.M. Keck Bioimaging Laboratory at Arizona State University provided the epifluorescence images of SiO 2 -FITC association with biomass samples. Dr. Scott Brown of the Center for Nano-Bio Sensors at the University of Florida provided the SiO 2 -FITC suspension. Laboratory facilities were provided by Dr. Jonathan Posner of the School of Mechanical, Aerospace, Chemical, and Materials Engineering at Arizona State University. Dr. Troy Benn prepared C 60 -PVP for use in our experiments.
PY - 2010/7
Y1 - 2010/7
N2 - Sorption to activated sludge is a major removal mechanism for pollutants, including manufactured nanoparticles (NPs), in conventional activated sludge wastewater treatment plants. The objectives of this work were to (1) image sorption of fluorescent NPs to wastewater biomass; (2) quantify and compare biosorption of different types of NPs exposed to wastewater biomass; (3) quantify the effects of natural organic matter (NOM), extracellular polymeric substances (EPS), surfactants, and salt on NP biosorption; and (4) explore how different surface functionalities for fullerenes affect biosorption. Batch sorption isotherm experiments were conducted with activated sludge as sorbent and a total of eight types of NPs as sorbates. Epifluorescence images clearly show the biosorption of fluorescent silica NPs; the greater the concentration of NPs exposed to biomass, the greater the quantity of NPs that biosorb. Furthermore, biosorption removes different types of NPs from water to different extents. Upon exposure to 400 mg/L total suspended solids (TSS) of wastewater biomass, 97% of silver nanoparticles were removed, probably in part by aggregation and sedimentation, whereas biosorption was predominantly responsible for the removal of 88% of aqueous fullerenes, 39% of functionalized silver NPs, 23% of nanoscale titanium dioxide, and 13% of fullerol NPs. Of the NP types investigated, only aq-nC60 showed a change in the degree of removal when the NP suspension was equilibrated with NOM or when EPS was extracted from the biomass. Further study of carbonaceous NPs showed that different surface functionalities affect biosorption. Thus, the production and transformations in NP surface properties will be key factors in determining their fate in the environment.
AB - Sorption to activated sludge is a major removal mechanism for pollutants, including manufactured nanoparticles (NPs), in conventional activated sludge wastewater treatment plants. The objectives of this work were to (1) image sorption of fluorescent NPs to wastewater biomass; (2) quantify and compare biosorption of different types of NPs exposed to wastewater biomass; (3) quantify the effects of natural organic matter (NOM), extracellular polymeric substances (EPS), surfactants, and salt on NP biosorption; and (4) explore how different surface functionalities for fullerenes affect biosorption. Batch sorption isotherm experiments were conducted with activated sludge as sorbent and a total of eight types of NPs as sorbates. Epifluorescence images clearly show the biosorption of fluorescent silica NPs; the greater the concentration of NPs exposed to biomass, the greater the quantity of NPs that biosorb. Furthermore, biosorption removes different types of NPs from water to different extents. Upon exposure to 400 mg/L total suspended solids (TSS) of wastewater biomass, 97% of silver nanoparticles were removed, probably in part by aggregation and sedimentation, whereas biosorption was predominantly responsible for the removal of 88% of aqueous fullerenes, 39% of functionalized silver NPs, 23% of nanoscale titanium dioxide, and 13% of fullerol NPs. Of the NP types investigated, only aq-nC60 showed a change in the degree of removal when the NP suspension was equilibrated with NOM or when EPS was extracted from the biomass. Further study of carbonaceous NPs showed that different surface functionalities affect biosorption. Thus, the production and transformations in NP surface properties will be key factors in determining their fate in the environment.
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U2 - 10.1016/j.watres.2010.05.036
DO - 10.1016/j.watres.2010.05.036
M3 - Article
C2 - 20547403
AN - SCOPUS:77954215460
SN - 0043-1354
VL - 44
SP - 4105
EP - 4114
JO - Water Research
JF - Water Research
IS - 14
ER -