Review on environmental selenium: Occurrence, public …
This technique can be applied as an in-situ approach to Se treatment, ... According to the study's findings, an average total selenium removal efficiency of 93.3–97.8% was generally attained. This selenium effluent was then further processed downstream by ultrafiltration membrane system to reach a 99.2% removal rate. In this …
Water | Free Full-Text | Breakthrough Curves Prediction of
This work describes an experimental and machine learning approach for the prediction of selenite removal on chemically modified zeolite for water treatment. Breakthrough curves were constructed using iron-coated zeolite adsorbent and the adsorption behavior was evaluated as a function of an initial contaminant concentration …
Bioaugmentation of UASB reactors with immobilized
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 smaller …
Selenium Removal from Water and Wastewater by …
This study reviews the reported techniques for Se removal from water and wastewater, including adsorption, biological treatment, microbial reduction, bioreactors, fungal …
Selenium Removal Technologies A Review
CH2M has written a comprehensive review article on selenium removal technologies for the North American Metals Council. This 233-page report includes specific approaches to selenium …
(PDF) Biological treatment technologies
The cost of constructing full-scale active selenium treatment facilities like those. described in Section 6.4 can be significant. Active biological selenium removal. plant projects can cost as ...
US7282152B2
The present invention provides a method for removing selenium from an aqueous stream by passing the aqueous stream, in combination with a quaternary amine compound, through a filter and recovering a treated aqueous stream which is depleted in selenium content relative to the untreated aqueous stream. The present method …
Recent advances in technologies for removal and …
The adsorption method is considered to be an effective way to remove selenium from aqueous solutions due to its wide range of adaptability, good treatment …
Selenium migration behaviors in wet flue gas desulfurization …
DOI: 10.1016/j.cej.2019.123891 Corpus ID: 214372149; Selenium migration behaviors in wet flue gas desulfurization slurry and an in-situ treatment approach @article{Renjie2020SeleniumMB, title={Selenium migration behaviors in wet flue gas desulfurization slurry and an in-situ treatment approach}, author={Zou Renjie and Haoyu …
Selenium migration mechanism in wet FGD slurry
No complex system or process is needed for this in-situ selenium removal approach, and it can easily combine with other available advanced deep removal technologies, to build the double defense ...
Methods for selenium removal from contaminated …
In summary, Se(VI) removal by zero-valent iron can be described as the adsorption of soluble Se(VI) onto the iron oxide layer followed by reduction to less …
TECHNOLOGIES AND POTENTIAL TECHNOLOGIES FOR …
Selenium removal is accomplished by using a strong base anion ion exchange resin. Selenium (VI) is extracted much more effectively than Se(IV). ... i.e., a biofilm was formed on the carbon surfaces. A second approach was to extract enzymes from the Pseudomonas bacteria which was then coated onto carbon surfaces or impregnated in gel beads. A ...
Machine learning approach to predict adsorption capacity …
The accurate prediction of environmental Se (selenium) adsorption levels is critical for sustainable development and management perception. The concept of sorting massive quantities of data to find important information using machine learning (ML) has recently been applied to environmental remediation, particularly the science-based …
Impact of dissolved oxygen and pH on the removal of selenium …
was found to be a more economically viable approach, as it reduced anode wear, electrode passivation, and energy consumption. The quantity of iron released increased with d, and the effect of current density on iron concentration was found to be non-linear. ... The reported methods for selenium removal from aqueous solution include ion ...
Selenite bioreduction and biosynthesis of selenium …
A native strain of Bacillus paramycoides isolated from the leachate of coal mine overburden rocks was investigated for its potential to produce selenium nanoparticles (SeNPs) by biogenic reduction of selenite, one of the most toxic forms of selenium. 16S rDNA sequencing was used to identify the bacterial strain (SP3). The SeNPs were …
Rapid adsorption of selenium removal using iron …
Selenium in wastewater is of particular concern due to its increasing concentration, high mobility in water, and toxicity to organisms; therefore, this study was …
Recent advances in technologies for removal and recovery of selenium
Selenium (Se) is distributed into different environmental compartments by natural and anthropogenic activities, and generally discharged in the form of selenate [S e O 4 2 −] and selenite [S e O 3 2 −], which are both toxic.Physical-chemical and biological treatment processes have been reported to exhibit good treatment efficiencies for Se …
Enhancement of a constructed wetland water treatment system …
The percentage of removal of selenium was highly dependent on the exact conditions of each constructed wetland, but the most frequent values ranged from around 40-50% as minimal values [298,299 ...
Development of a Constructed Wetland Water Treatment
The percentage of removal of selenium was highly dependent on the exact conditions of each constructed wetland, but the most frequent values ranged from around 40-50% as minimal values [298,299 ...
Near Quantitative Removal of Selenate and Sulfate Anions …
Selenium (Se) has become an environmental contaminant of aquatic ecosystems as a result of human activities, particularly mining, fossil fuel combustion, and agricultural activities. By leveraging the high sulfate concentrations relative to Se oxyanions (i.e., SeOn2–, n = 3, 4) present in some wastewaters, we have developed an efficient …
A critical review on sulfur reduction of aqueous
Tan et al. determined that the performance of selenium removal showed a trend of a 20–30% decrease at influent pH 5.0 compared to pH 7.0, ... Once sulfur spheres are formed, sulfur will be replaced by natural selenium through a thermodynamically driven approach to form selenium spheres ((20), (21)).
(PDF) Selenium removal from mining and process
The removal of selenium from water is complex, determined by its speciation and often expensive due to the characteristics of the wastewater and the stringent discharge limits for selenium...
Mapping of Selenium Toxicity and Technological Advances for its Removal
Due to the toxic nature of selenium, mapping of technological advances for the removal of this element requires immediate attention. This chapter has captured the significant research taking place in this area using a scientometric approach. This study has identified the most-cited research, authors, institution, and countries since 2000.
XPS spectra of iron nanoparticles after selenate removal.
The coprecipitation of selenium(IV) (Se) with iron(III) (Fe) is a widely practiced method for the removal of Se from mineral processing effluents, but the effect of gypsum as a major secondary ...
The application of Fe–Mn hydrous oxides based
Among them, adsorption is drawing increasing attention as a practical and economic approach for selenium removal from contaminated water, due to its favorable features that include easy operation ...
Selenium removal from mining and process …
This review explores the most frequently used methods for selenium removal from mining and process wastewaters in order to give an extensive overview of the possibilities to …
Methods for selenium removal from contaminated waters: a …
Worldwide contamination of waters by metals, metalloids, and organometallic pollutants is a major health issue. In particular, the occurrence of the selenium metalloid at rather high concentrations in the environment, especially in the water compartment, is of increasing concern, notably in developing countries. Selenium is difficult to remove from …
A critical analysis of sources, pollution, and remediation of selenium …
Another novel approach demonstrated in the article is the presentation of an overwhelming evidence of limitations that various researchers are confronted with to overcome achieving effective remediation. ... Bleiman N, Mishael YG. Selenium removal from drinking water by adsorption to chitosan-clay composites and oxides: Batch and …
Selenium removal from water and its recovery using iron …
An innovative approach pointed to the employment of nanoparticles, nanocomposites and other nanomaterials for the intensification of selenium removal [161, 162]. ZVI must be considered a very ...
A Bibliometric Analysis of Research on Selenium in Drinking …
An innovative approach pointed to the employment of nanoparticles, ... Biological selenium removal by environmentally sustainable technologies is an attractive alternative due to the water characteristics (dilute selenium concentration and high volume to be treated) and low costs. In addition, adequate biological treatment may imply the ...
