Selenium: environmental significance, pollution, and biological treatment technologies

Tan, Lea Chua; Nancharaiah, Y.V.; Hullebusch, Eric D. van; Lens, Piet N.L.

doi:10.1016/j.biotechadv.2016.05.005

Cited by 389 publications

(170 citation statements)

References 160 publications

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“…Tan et al [6], in a recent extensive review, reported the different types of organic and inorganic Se species available. The inorganic form of Se is typically found in surface and ground water in a number of reported forms such as Se −2 (selinide), SeO 3 −2 (selenite), SeO 4 −2 (selenate), and Se 0 , which is the species nonsoluble form.…”

Section: Introductionmentioning

confidence: 99%

“…In order to meet the drinking water standards for Se in addition to treating industrial, mining wastewaters and agricultural run-offs, a varied number of treatment processes are reported in the open literature with various degrees of complexity and advancement. 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.…”

Section: Introductionmentioning

confidence: 99%

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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%

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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“…14,19 Neste contexto, têm sido empregadas técnicas espectroscópicas, 20 técnicas cromatográficas 21 e técnicas eletroanalíticas. 22 Um detalhado levantamento bibliográfico mostrou que até 1970 houve a predominância no uso de técnicas eletroanalíticas, principalmente em função da simplicidade analítica e da possibilidade de especiação química.…”

Section: Metodologias Empregadas Na Determinação De Selêniounclassified

Compostos Orgânicos E Inorgânicos Contendo Selênio: Revisão De Métodos Analíticos E Perspectivas Para Análises Químicas

et al. 2017

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publicado na web em 13/11/2017 ORGANIC AND INORGANIC COMPOUNDS CONTAINING SELENIUM: ANALYTICAL METHODS REVIEW AND CHEMICAL ANALYSIS PERSPECTIVES. This article critically reviews the spectrometric, chromatographic and electroanalytical methods applied for the identification and quantification of organic and inorganic compounds containing Se and their applications in food, biological and natural water samples. The main characteristics, advantages and disadvantages of each analytical method are presented, and special attention is paid to sample preparation strategies prior to identification and quantification. Perspectives of research on new analytical procedures with improved speed, sensitivity, selectivity, accuracy, and mainly environmentally friendly, are also reported.Keywords: selenium; analytical determination; spectrometry; chromatography; electroanalysis; speciation. CONSIDERAÇÕES GERAISA magnífica máquina humana necessita de diversos nutrientes, os quais são o combustível para a manutenção do seu perfeito funcionamento. Dependendo das quantidades necessárias, estes nutrientes são classificados como macronutrientes (carboidratos, proteínas, lipídios e fibras) e micronutrientes (vitaminas e minerais). Estes compostos apresentam funções específicas e, consequentemente, diferentes concentrações ideais para o desempenho de suas funções metabólicas. A ingestão diária de nutrientes dependerá da composição química da dieta alimentar. 1Dentre os principais micronutrientes destacam-se ferro, zinco, cobre, selênio, cromo, iodo, molibdênio, manganês, silício, níquel, boro, vanádio, flúor, arsênio, alumínio, lítio e estanho, seja em suas formas orgânicas ou inorgânicas. Estes compostos desempenham suas respectivas atividades metabólicas quando presentes em concentrações abaixo de microgramas por grama (µg g -1 ). Entretanto, acima destas concentrações podem apresentar toxicidade ao organismo humano. 1 Selênio, apresentado com a sigla Se, é um micronutriente essencial para a dieta humana, em função das suas propriedades antioxidantes, auxiliando no retardamento do envelhecimento, no tratamento de doenças cardiovasculares e neoplasias, distrofia muscular, esclerose múltipla, osteoporose, reprodutividade, e desordem muscular.2,3 Alguns estudos indicam sua importância no metabolismo e funcionamento da tireóide e sua atuação no metabolismo dos ácidos graxos, juntamente com a vitamina E (α-tocoferol). 4,5 Assim, o Conselho Americano de Alimentação e Nutrição (Food and Nutrition Board, EUA), 6 recomenda a ingestão diária de 15 a 20 µg por dia, de 55 µg por dia e 70 µg por dia, para crianças, mulheres lactantes e outros adultos, respectivamente. Entretanto, o limite má-ximo de ingestão diário para uma pessoa adulta não deve ultrapassar 400 µg.A diferença entre a concentração essencial de Se, a deficiência ou a toxicidade é muito pequena. As concentrações ingeridas são fortemente dependentes do nível de concentração em alimentos e na quantidade de alimento ingerido.7 O consumo diário abaixo de 0,1 µg de Se por grama de aliment...

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“…8 If selenium oxyanions are left untreated in wastewater, selenium tends to bioaccumulate and poses a risk to the aquatic life in the receiving environment. 9,10 The presence of selenium in petrochemical wastewaters is due to its similar chemical behaviour to sulfur in the crude oil. Sulfur and selenium go through the refinery processes until separation takes place within the water strippers, where selenium remains mostly at the bottom of the strippers.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of selenite and phenol from wastewater in an upflow fungal pellet bioreactor

Werkneh

Rene

Lens

2017

J of Chemical Tech & Biotech

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BACKGROUND The simultaneous treatment of wastewater containing selenite and phenol in batch and continuous systems, inoculated with pellets of Phanerochaete chrysosporium, was evaluated in this study. RESULTS Synthetic oil refinery wastewater containing 15 mg L−1 selenite and 100–600 mg L−1 phenol was used in batch incubations for 5 days. Orange‐red colored pellets developed during selenite incubations in the presence of up to 400 mg L−1 of phenol, which confirms the formation of elemental selenium with removal efficiencies ranging from 57–78.5% and 75–90.8% for, respectively, phenol and selenite. Continuous experiments in two upflow fungal pelleted bioreactors (30 °C, pH 4.5, hydraulic retention time of 16.7 h) fed the synthetic oil refinery wastewater containing phenol or phenol with selenite were performed for 38 days. The maximum removal efficiency of phenol in the fungal bioreactor was 100% (up to day 26). CONCLUSION Selenite mass balance showed that the overall maximum removal efficiency of selenite in the presence of phenol was 67.3%. The critical phenol and selenite loading rates of the upflow bioreactors were ∼12 and 4.3 mg L−1 h−1, respectively. © 2017 Society of Chemical Industry

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Selenium: environmental significance, pollution, and biological treatment technologies

Cited by 389 publications

References 160 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

Compostos Orgânicos E Inorgânicos Contendo Selênio: Revisão De Métodos Analíticos E Perspectivas Para Análises Químicas

Simultaneous removal of selenite and phenol from wastewater in an upflow fungal pellet bioreactor

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