Recovering rare earth elements via immobilized red algae from ammonium-rich wastewater  

作　　者：Yabo Sun Tao Lu Yali Pan Menghan Shi Dan Ding Zhiwen Ma Jiuyi Liu Yupeng Yuan Ling Fei Yingqiang Sun 

机构地区：[1]School of Chemistry&Chemical Engineering,School of Material Science&Engineering,Anhui University,Jiulong Rd 111,Hefei,Anhui,230039,PR China [2]Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University),Ministry of Education,Hefei,Anhui,230601,PR China [3]Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province,Anhui University,Hefei,Anhui,230601,PR China [4]Chemical Engineering Department,University of Louisiana at Lafayette,Lafayette,LA,70504,United States

出　　处：《Environmental Science and Ecotechnology》2022年第4期72-80,共9页环境科学与生态技术（英文）

基　　金：financial support from the Anhui Provincial Natural Science Foundation-China(1908085QB70);the Natural Science Fund of the Education Department of Anhui Province(KJ2021A0031);Anhui University(Startup Fund-China Y040418343);the Horizontal Cooperation Project of Fuyang Municipal Government-Fuyang Normal University(SXHZ202102)。

摘　　要：Biotreatment of acidic rare earth mining wastewater via acidophilic living organisms is a promising approach owing to their high tolerance to high concentrations of rare earth elements(REEs);however,simultaneous removal of both REEs and ammonium is generally hindered since most acidophilic organisms are positively charged.Accordingly,immobilization of acidophilic Galdieria sulphuraria(G.sulphuraria)by calcium alginate to improve its affinity to positively charged REEs has been used for simultaneous bioremoval of REEs and ammonium.The results indicate that 97.19%,96.19%,and 98.87%of La,Y,and Sm,respectively,are removed by G.sulphuraria beads(GS-BDs).The adsorption of REEs by calcium alginate beads(BDs)and GS-BDs is well fitted by both pseudo first-order(PFO)and pseudo second-order(PSO)kinetic models,implying that adsorption of REEs involves both physical adsorption caused by affinity of functional groups such as-COO-and -OH and chemical adsorption based on ion exchange of Ca^(2+) with REEs.Notably,GS-BDs exhibit high tolerance to La,Y,and Sm with maximum removal efficiencies of 97.9%,96.6%,and 99.1%,respectively.Furthermore,the ammonium removal efficiency of GS-BDs is higher than that of free G.sulphuraria cells at an initial ammonium concentration of 100 mg L^(-1),while the efficiency decreases when initial concentration of ammonium is higher than 150 mg L^(-1).Last,small size of GS-BDs favors ammonium removal because of their lower mass transfer resistance.This study achieves simultaneous removal of REEs and ammonium from acidic mining drainage,providing a potential strategy for biotreatment of REE tailing wastewater.

关 键 词：Immobilized algae Galdieria sulphuraria Rare earth elements Deammonification BIOTREATMENT 

分 类 号：TF845[冶金工程—有色金属冶金] X703[环境科学与工程—环境工程]