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Purpose of Review (Mal-)nutrition of micronutrients, like selenium, has great impact on the human heart and improper micronutrient intake was observed in 30–50% of patients with heart failure. Low selenium levels have been reported in Europe and Asia and thought to be causal for Keshan disease. Selenium is an essential micronutrient that is …
80–98% removal of dissolved Se but the capacity of these systems to lower the concentration to the 2016 U.S. EPA chronic freshwater ambient water quality criterion of 0.003 mg Se/L (U.S.EPA 2016) has not been demonstrated. Another key consideration for all treatment technologies is the possibility that it will release pollutants that could
Dissolved‑selenium removal using magnetic nanoparticles: A state-of-the-art review. 2023, Journal of Water Process Engineering. Show abstract. Selenium (Se) is an essential trace nutrient for human beings, but excessive consumption is badly toxic and causes specific harm. At present, with serious Se pollution to the water environment, it is ...
A standard point source such as 152 Eu is used in energy calibrations of the spectra . 5 Production of Activated Carbon. ... Seen from Fig. 19.5, removal of selenium by activated carbon is increased with increasing time and reaches equilibrium within 60 min. The selenium adsorption by the adsorbent reaches a plateau after these contact intervals.
Regression curve of the initial Fe 3+ / total selenium ratio required for the removal of 85% - 95% of initial total selenium in industrial wastewater. For example, a concentration of 7600 mg/L of FeCl 3 required for removal of 85% - 95% of initial total selenium of 80 mg / L is calculated. The required reaction time is estimated to be 80 ...
ABMet for power (FGD), mining and refining wastewater system removes selenium and other biological metals effective with minimal operating costs. Learn more from Veolia.
2-removal, and it is pH depen-dent (Mavrov et al., 2006; Gleason et al., 1996). While Se reduction has been used, and SeO 4 2-can be reduced to SeO 3 2-or elemental Se to facilitate its removal ...
ABMet is a revolutionary biological process that removes metals and inorganics from wastewater to below non-detect levels. The ABMet process uses naturally occurring, non-pathogenic microbes to reduce and …
To render arsenic- and selenium-containing waters safe for humans and the environment, the U.S. Environmental Protection Agency (EPA) specifies treatment to levels of arsenic that are no higher than 0.010 milligrams per liter (mg/L) in drinking water and levels of selenium that are no higher than 0.05 mg/L in drinking and raw water.
Comparative selenium removal efficiencies were achieved in R2 only after a delay of 5 days (20 HRT; Fig. 1b). The Se dis removal efficiency was lower than the selenate removal efficiency in all three reactors with maximal differences of 37%, 34%, and 43% in R1 to R3, respectively. Toward the end of period II, the difference became …
Selenium status and the impact of dietary selenium supplementation in WNV-infected humans have not been investigated yet, but there is in vitro and in vivo evidence for a beneficial role of selenium. Selenium-deficient monkey kidney epithelial cells were more prone to virus-induced apoptotic cell death than cells cultured in selenium ...
Operate 24 hours per day, 7 days per week and year-round for treatment of agricultural drainage water supplied by USBR from seven sumps, via pipeline, and blended within a 500,000-gallon equalization tank supplied by USBR; Achieve ABMet process efluent selenium concentration less than 5 ppb;
Selenium (Se) has become an increasingly serious water contamination concern worldwide. It is an essential micronutrient for humans and animals, however, can be extremely toxic if taken in excess. Sorption can be an effective treatment for Se removal from a wide range of water matrices. However, des …
Consistently removes selenium from power, refinery, landfill, mining, storm water runoff, and other industrial process and wastewater streams, enabling facilities to meet discharge regulations; Requires less capital investment; Removes selenium without concern for standard upstream …
Biological reduction of selenium oxyanions is widely used for selenium removal from wastewater. The process is, however, limited by the availability of a suitable, efficient and low cost electron donor. ... SO 4 2− + 4H 2 + H + ⇌ HS − + 4H 2 O; ΔG o = −152 kJ/mol. According to this reaction, the Gibbs free energy of sulfate reduction ...
The research efforts targeted toward the search for technical solutions for molybdenum removal from water are not as important as the ones focused on the identification of molybdenum-polluted ...
Se(IV) removal using nanoscale zero-valent iron (nZVI) has been extensively studied. Still, the synergistic removal of Se(IV) by reduced graphene oxide-supported nanoscale zero-valent iron (nZVI/rGO) has not been reported. In this study, nZVI/rGO was successfully synthesized for Se(IV) removal from wastewater. The effects …
Removal of the toxic selenium compounds selenite and selenate from waste water before discharge is becoming increasingly imperative in industrialized countries. Bacteria can reduce selenate to selenite, but also further to elemental selenium, selenide or organic selenium. In this paper, we aim to exclusively bio-reduce selenate to selenite in ...
The present study reports detailed evaluation of mesoporous activated alumina (MAA) for simultaneous removal of two hazardous inorganic species of selenium, namely selenite and selanate, from drinking water. MAA was used after washing with deionized water followed by drying at 110 °C for 8 h. The material was characterized …
Direct Selenium Removal. A complicating issue with direct selenium removal from power plant wastewater, and especially from WFGD wastewaters, has been the interference of competing ions with the ...
The effect of current density on Se removal in EC treatment was investigated by running at different current densities with 5, 10 and 15 mA cm −2.As shown in Fig. 2 a, the results indicated that increased of current density caused a significant Se removal. It was clear that the removal efficiencies for Se were 45.6%, 79.1% and 88.1% for applied …
View Image Gallery. A critical issue at coal-fired power plants — those remaining and many of those that have shut down — is how to …
Emerging technologies in selenium removal have focused on using electrocoagulation, a method that electrochemically introduces a metal ion, such as ferrous iron, to water to ultimately remove contaminants from wastewater in a few different ways: the release of ferrous iron from the anode introduces a reactive species that can remove …
Anthropogenic-driven selenium (Se) contamination of natural waters has emerged as severe health and environmental concern. Lowering Se levels to safe limits of 40 μg-L −1 (recommended by WHO) presents a critical challenge for the scientific community, necessitating reliable and effective methods for Se removal. The primary obectives of …
Veolia has developed the Tracer TM Se process (patent pending), which is a new method for selenium removal based on biological reduction of selenium to selenite, its subsequent removal from water using surface complexation on ferric oxy hydroxide, and further biological oxidation of the treated water. The mechanisms by which selenium is ...
There is now a patent-pending physical-chemical alternative to biological selenium removal, which utilizes a tailored formulation in existing process equipment for a series of chemical reactions with …
A bibliometric analysis based on the Scopus database was carried out to summarize the global research related to selenium in drinking water from 1990 to 2021 and identify the quantitative characteristics of the research in this period. The results from the analysis revealed that the number of accumulated publications followed a quadratic …
Volume 634, Issue 2, 23 February 2009, Pages 135-152. Review. Novel approaches for selenium speciation in foodstuffs and biological specimens: A review. Author links open overlay panel Zoyne Pedrero, Yolanda Madrid. ... and environmental concerns. Moreover, after the removal, the recovery methodologies using appropriate …
An overview of the different physico-chemical and biological technologies used for the removal of selenium from contaminated water were discussed wherein adsorption capacities in the range of 0.22–120 mg/g and 0.135–127 mg/g, respectively, were reported in the literature. The challenges and future research directions in this progressive ...
Wastewater . If selenium is oxidized, it is present as the anion selenate (SeO 4 2-) that can be removed from solution with an anion exchange resin.. AmberLyst™ A21 Weak Base Anion Resin will remove weak acids, like selenate from water.The influent should be weakly acidic, pH of 2-5. This weak base anion resin will also remove other weak acids like …
204/152: 5200082: Method for removing toxic substances from industrial and agricultural waste water: : Olsen et al. 210/667: 5071568: Selenium removal process: ... Particularly, selenium removal may be accomplished by the use of anion exchange resins containing thiouronium groups. While commercially available ion …