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Simultaneous removal of critical rare earth elements and chalcogen oxyanions by anaerobic granular sludge

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Conventional mining of economically and strategically important critical rare earth elements(REEs)(such as neodymium,lanthanum and dysprosium),and chalcogens(such as selenium and tellurium)are associated with a huge economic and environmental cost.Therefore,the need to recover REEs as well as chalcogens from dif-ferent waste streams including wastewaters is becoming urgent.Batch assays on synthetic chalcogen/REE-laden wastewater showed that the presence of REEs significantly improved the tellurite removal rate(＞80％)and enhanced selenate removal by 66％±10％.Three 3.9 L continuous upflow anaerobic granular sludge bed(UASB)reactors were operated at a hydraulic retention time of 24 h and 30 ℃.Selenate reduction was achieved with a removal efficiency of～98％with an influent pH of 4.0 for more than 28 days.The effect of REEs on tellurite removal in the UASB bioreactor could not be clearly established since a soluble tellurium removal efficiency of more than 98％was observed already before the addition of REEs at ele-vated tellurite concentrations.The complete REE removal in both batch assays and UASB reactors at higher pH(7.0±0.5)was attributed to precipitation,whereas chalcogen oxyanions removal was due to microbial reduction.However,at acidic pH,biosorption was responsible for REE's removal,and the Se-enriched sludge exhibited a superior REE's removal efficiency than the non-enriched and Te-enriched sludge.

Rare earth elementsSeleniumTelluriumBioreductionAdsorption

Chiara Belloni、Mohanakrishnan Logan、Stefano Papirio、Piet N.L.Lens

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University of Galway,Galway H91 TK33,Ireland

Department of Civil,Architectural and Environmental Engineering,University of Naples Federico Ⅱ,80125 Naples,Italy

Erasmus+programme of the European Union,the Science Foundation Ireland(SFI)through the SFI Research Professorship Programme Research Infrastructure Research Grant Platform for Biofuel Analysis

15/RP/276316/RI/3401

2024

10.1007/s12598-024-02726-5

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(9)
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