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

作　　者：Chiara Belloni Mohanakrishnan Logan Stefano Papirio Piet N.L.Lens 

机构地区：[1]University of Galway,Galway H91 TK33,Ireland [2]Department of Civil,Architectural and Environmental Engineering,University of Naples Federico II,80125 Naples,Italy

出　　处：《Rare Metals》2024年第9期4595-4611,共17页稀有金属（英文版）

基　　金：financially by the Erasmus+programme of the European Union,the Science Foundation Ireland(SFI)through the SFI Research Professorship Programme entitled Innovative Energy Technologies for Biofuels,Bioenergy and a Sustainable Irish Bioeconomy(IETSBIO3)(No.15/RP/2763);the Research Infrastructure Research Grant Platform for Biofuel Analysis(No.16/RI/3401).

摘　　要：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 different 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 p H 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 elevated 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 p H,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.

关 键 词：Rare earth elements SELENIUM TELLURIUM BIOREDUCTION Adsorption 

分 类 号：X703[环境科学与工程—环境工程] O647.3[理学—物理化学]