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

Environmental Science and Ecotechnology 2022年第4期12卷 72-80页

作者： Yabo Sun Tao Lu Yali Pan Menghan Shi Dan Ding Zhiwen Ma Jiuyi Liu Yupeng Yuan Ling Fei Yingqiang Sun School of Chemistry&Chemical Engineering School of Material Science&EngineeringAnhui UniversityJiulong Rd 111HefeiAnhui230039PR China Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University) Ministry of EducationHefeiAnhui230601PR China Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province Anhui UniversityHefeiAnhui230601PR China Chemical Engineering Department University of Louisiana at LafayetteLafayetteLA70504United States

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 ***,immobilization of acidophilic Galdieria sulphuraria(***)by calcium alginate to improve its affinity to positively charged REEs has been used for simultaneous bioremoval of REEs and *** results indicate that 97.19%,96.19%,and 98.87%of La,Y,and Sm,respectively,are removed by *** 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 ***,GS-BDs exhibit high tolerance to La,Y,and Sm with maximum removal efficiencies of 97.9%,96.6%,and 99.1%,***,the ammonium removal efficiency of GS-BDs is higher than that of free *** 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 *** 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

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Copper biosorption on immobilized seaweed biomass:Column breakthrough characteristics

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Journal of Environmental Sciences 2007年第8期19卷 928-932页

作者： K. H. Chu M. A. Hashim Honeywell Process Solutions 17 Changi Business Park Central 1 Singapore 486073. Department of Chemical Engineering University of Malaya 50603 Kuala Lumpur Malaysia

The biosorption of copper by the brown seaweed Sargassum baccularia, immobilized onto polyvinyl alcohol （PVA） gel beads, was investigated with fixed-bed experiments. Laboratory-scale column tests were performed to determine breakthrough curves with varying flow rates and feed concentrations. A theoretical fixed-bed model, known as the Bohart-Adams equation, was evaluated in simulating the experimental breakthrough curves. The Bohart-Adams model qualitatively predicted the breakthrough trends. PVA- immobilized seaweed biomass beads were amenable to efficient regeneration with aqueous solution containing the chelating agent ethylenediaminetetraacetic acid （EDTA）. The biosorbent retained most of its original uptake capacity over three cycles of use. The excellent reusability of the biosorbent could lead to the development of a viable metal remediation technology.

关键词： adsorption biosorption fixed bed immobilized algae polyvinyl alcohol

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