Removal of colloidal biogenic selenium from wastewater

Staicu, Lucian C.; Hullebusch, Eric D. van; Oturan, Mehmet A.; Ackerson, Christopher J.; Lens, Piet N.L.

doi:10.1016/j.chemosphere.2014.12.018

Cited by 80 publications

(41 citation statements)

References 44 publications

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“…Comprehensive reviews conducted by Robberecht and Van Grieken [4] and Tan et al [6] offer an excellent overview of all current known treatments used for Se. It can be seen from the two recent reviews that although a great variety of biological [12–14], chemical [15–20], and physical treatments technologies [9, 21, 22] were developed in recent years, no single treatment offers a complete and cost effective scheme for treating Se from waste or drinking water. While biological treatments stand as one of the best options for treating Se, challenges related to long-term stability of the biogenic selenium and the predicting of the fate of the bioreduced Se in the environment are two major concerns.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Adsorption of Selenium Ions from Aqueous Solution Using Iron Oxide Impregnated Carbon Nanotubes

Bakather

Fard

Ihsanullah

et al. 2017

Bioinorganic Chemistry and Applications

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The aim of this research was to investigate the potential of raw and iron oxide impregnated carbon nanotubes (CNTs) as adsorbents for the removal of selenium (Se) ions from wastewater. The original and modified CNTs with different loadings of Fe2O3 nanoparticles were characterized using high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray diffractometer (XRD), Brunauer, Emmett, and Teller (BET) surface area analyzer, thermogravimetric analysis (TGA), zeta potential, and energy dispersive X-ray spectroscopy (EDS). The adsorption parameters of the selenium ions from water using raw CNTs and iron oxide impregnated carbon nanotubes (CNT-Fe2O3) were optimized. Total removal of 1 ppm Se ions from water was achieved when 25 mg of CNTs impregnated with 20 wt.% of iron oxide nanoparticles is used. Freundlich and Langmuir isotherm models were used to study the nature of the adsorption process. Pseudo-first and pseudo-second-order models were employed to study the kinetics of selenium ions adsorption onto the surface of iron oxide impregnated CNTs. Maximum adsorption capacity of the Fe2O3 impregnated CNTs, predicted by Langmuir isotherm model, was found to be 111 mg/g. This new finding might revolutionize the adsorption treatment process and application by introducing a new type of nanoadsorbent that has super adsorption capacity towards Se ions.

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Section: Introductionmentioning

confidence: 99%

Enhanced Adsorption of Selenium Ions from Aqueous Solution Using Iron Oxide Impregnated Carbon Nanotubes

Bakather

Fard

Ihsanullah

et al. 2017

Bioinorganic Chemistry and Applications

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“…The impact of colloidal elemental Se(0) on bivalve mollusks and trophic networks was investigated extensively in the San Francisco Bay area (Purkerson et al 2003;Presser and Luoma 2006;EPA 2010;Schlekat et al 2010). To complicate matters further, biogenic Se(0) exhibits colloidal properties that make its separation from aqueous solution problematic (Buchs et al 2013;Staicu et al 2014a).…”

Section: Introductionmentioning

confidence: 99%

Electrocoagulation of colloidal biogenic selenium

Staicu

Hullebusch

Lens

et al. 2014

Environ Sci Pollut Res

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Colloidal elemental selenium (Se(0)) adversely affects membrane separation processes and aquatic ecosystems. As a solution to this problem, we investigated for the first time the removal potential of Se(0) by electrocoagulation process. Colloidal Se(0) was produced by a strain of Pseudomonas fluorescens and showed limited gravitational settling. Therefore, iron (Fe) and aluminum (Al) sacrificial electrodes were used in a batch reactor under galvanostatic conditions. The best Se(0) turbidity removal (97 %) was achieved using iron electrodes at 200 mA. Aluminum electrodes removed 96 % of colloidal Se(0) only at a higher current intensity (300 mA). At the best Se(0) removal efficiency, electrocoagulation using Fe electrode removed 93 % of the Se concentration, whereas with Al electrodes the Se removal efficiency reached only 54 %. Due to the less compact nature of the Al flocs, the Se-Al sediment was three times more voluminous than the Se-Fe sediment. The toxicity characteristic leaching procedure (TCLP) test showed that the Fe-Se sediment released Se below the regulatory level (1 mg L(-1)), whereas the Se concentration leached from the Al-Se sediment exceeded the limit by about 20 times. This might be related to the mineralogical nature of the sediments. Electron scanning micrographs showed Fe-Se sediments with a reticular structure, whereas the Al-Se sediments lacked an organized structure. Overall, the results obtained showed that the use of Fe electrodes as soluble anode in electrocoagulation constitutes a better option than Al electrodes for the electrochemical sedimentation of colloidal Se(0).

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“…Furthermore, these adsorbents need careful synthesis whereas BioSeNPs are present in the effluent of bioreactors (e.g. the UASB reactor) treating selenium oxyanions containing wastewater for which a secondary removal step is required [13,16,30,31]. In continuous bioprocesses, solid-liquid separation of BioSeNPs after adsorption can be carried out using simple gravity settling as demonstrated in a previous study [12].…”

Section: Optimized Initial Metal Solution Ph and Metal To Biosenps Ramentioning

confidence: 97%

Preferential adsorption of Cu in a multi-metal mixture onto biogenic elemental selenium nanoparticles

Jain

Dominic

Jordan

et al. 2016

Chemical Engineering Journal

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Removal of colloidal biogenic selenium from wastewater

Cited by 80 publications

References 44 publications

Enhanced Adsorption of Selenium Ions from Aqueous Solution Using Iron Oxide Impregnated Carbon Nanotubes

Enhanced Adsorption of Selenium Ions from Aqueous Solution Using Iron Oxide Impregnated Carbon Nanotubes

Electrocoagulation of colloidal biogenic selenium

Preferential adsorption of Cu in a multi-metal mixture onto biogenic elemental selenium nanoparticles

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