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Title: Microbe Encapsulation for Selective Rare-Earth Recovery from Electronic Waste Leachates

Abstract

Rare earth elements (REEs) are indispensable components of many green technologies and of increasing demand globally. However, refining REEs from raw materials using current technologies is energy intensive and enviromentally damaging. Here, we describe the development of a novel biosorption-based flow-through process for selective REE recovery from electronic wastes. An Escherichia coli strain previously engineered to display lanthanide-binding tags on the cell surface was encapsulated within a permeable polyethylene glycol diacrylate (PEGDA) hydrogel at high cell density using an emulsion process. This microbe bead adsorbent contained a homogenous distribution of cells whose surface functional groups remained accessible and effective for selective REE adsorption. The microbe beads were packed into fixed-bed columns, and breakthrough experiments demonstrated effective Nd extraction at a flow velocity of up to 3 m/h at pH 4–6. The microbe bead columns were stable for reuse, retaining 85% of the adsorption capacity after nine consecutive adsorption/desorption cycles. A bench-scale breakthrough curve with a NdFeB magnet leachate revealed a two-bed volume increase in breakthrough points for REEs compared to non-REE impurities and 97% REE purity of the adsorbed fraction upon breakthrough. These results demonstrate that the microbe beads are capable of repeatedly separating REEs from non-REE metals in amore » column system, paving the way for a biomass-based REE recovery system.« less

Authors:
 [1];  [2];  [2]; ORCiD logo [2];  [3]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [4];  [1];  [1];  [3]; ORCiD logo [1]; ORCiD logo [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Univ. of California, Berkeley, CA (United States)
  4. Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1631910
Report Number(s):
LLNL-JRNL-767490
Journal ID: ISSN 0013-936X; 957967
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 53; Journal Issue: 23; Journal ID: ISSN 0013-936X
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
Materials science; Geosciences; Biological and medical sciences; Chemistry - Inorganic, organic, physical and analytical chemistry

Citation Formats

Brewer, Aaron, Dohnalkova, Alice, Shutthanandan, Vaithiyalingam, Kovarik, Libor, Chang, Elliot, Sawvel, April M., Mason, Harris E., Reed, David, Ye, Congwang, Hynes, William F., Lammers, Laura N., Park, Dan M., and Jiao, Yongqin. Microbe Encapsulation for Selective Rare-Earth Recovery from Electronic Waste Leachates. United States: N. p., 2019. Web. https://doi.org/10.1021/acs.est.9b04608.
Brewer, Aaron, Dohnalkova, Alice, Shutthanandan, Vaithiyalingam, Kovarik, Libor, Chang, Elliot, Sawvel, April M., Mason, Harris E., Reed, David, Ye, Congwang, Hynes, William F., Lammers, Laura N., Park, Dan M., & Jiao, Yongqin. Microbe Encapsulation for Selective Rare-Earth Recovery from Electronic Waste Leachates. United States. https://doi.org/10.1021/acs.est.9b04608
Brewer, Aaron, Dohnalkova, Alice, Shutthanandan, Vaithiyalingam, Kovarik, Libor, Chang, Elliot, Sawvel, April M., Mason, Harris E., Reed, David, Ye, Congwang, Hynes, William F., Lammers, Laura N., Park, Dan M., and Jiao, Yongqin. Fri . "Microbe Encapsulation for Selective Rare-Earth Recovery from Electronic Waste Leachates". United States. https://doi.org/10.1021/acs.est.9b04608. https://www.osti.gov/servlets/purl/1631910.
@article{osti_1631910,
title = {Microbe Encapsulation for Selective Rare-Earth Recovery from Electronic Waste Leachates},
author = {Brewer, Aaron and Dohnalkova, Alice and Shutthanandan, Vaithiyalingam and Kovarik, Libor and Chang, Elliot and Sawvel, April M. and Mason, Harris E. and Reed, David and Ye, Congwang and Hynes, William F. and Lammers, Laura N. and Park, Dan M. and Jiao, Yongqin},
abstractNote = {Rare earth elements (REEs) are indispensable components of many green technologies and of increasing demand globally. However, refining REEs from raw materials using current technologies is energy intensive and enviromentally damaging. Here, we describe the development of a novel biosorption-based flow-through process for selective REE recovery from electronic wastes. An Escherichia coli strain previously engineered to display lanthanide-binding tags on the cell surface was encapsulated within a permeable polyethylene glycol diacrylate (PEGDA) hydrogel at high cell density using an emulsion process. This microbe bead adsorbent contained a homogenous distribution of cells whose surface functional groups remained accessible and effective for selective REE adsorption. The microbe beads were packed into fixed-bed columns, and breakthrough experiments demonstrated effective Nd extraction at a flow velocity of up to 3 m/h at pH 4–6. The microbe bead columns were stable for reuse, retaining 85% of the adsorption capacity after nine consecutive adsorption/desorption cycles. A bench-scale breakthrough curve with a NdFeB magnet leachate revealed a two-bed volume increase in breakthrough points for REEs compared to non-REE impurities and 97% REE purity of the adsorbed fraction upon breakthrough. These results demonstrate that the microbe beads are capable of repeatedly separating REEs from non-REE metals in a column system, paving the way for a biomass-based REE recovery system.},
doi = {10.1021/acs.est.9b04608},
journal = {Environmental Science and Technology},
number = 23,
volume = 53,
place = {United States},
year = {2019},
month = {11}
}

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