Nano composite application for selenium removal
Selenium removal from well water (closed due to high selenium concentrations, 0.1 mg/L) by the composite, brought levels to below the WHO limit (0.01 mg/L) and was selective for selenium even in ...
Recent advances in technologies for removal and …
The Se removal efficacy can be enhanced by: (i) reorienting the future research focus towards novel techniques effective specifically towards overcoming the reduction competition among ions (by pretreatment of inhibiting species and/or Se …
Selenium Water Treatment
Selenium removal from wastewater is an issue that many industrial sites trying to achieve discharge requirements must address. Selenium is a naturally-occurring element, however certain industrial activities can elevate selenium levels in both waste and process water. These activities include mining, refining, coal combustion, and other ...
Technologies to Remove Selenium from Water and …
First Online: 29 April 2021. 569 Accesses. 10 Citations. Part of the book series: Environmental Chemistry for a Sustainable World ( (ECSW,volume 66)) Abstract. After …
Selenium removal from petroleum refinery wastewater …
For this purpose, a batch airlift reactor with air stirring was used. The sacial electrodes were made of iron to generate the necessary ferrous ions for the process. The results indicated a selenium removal of 90% from the wastewater after 6 h of treatment, achieving a decrease in concentration from 0.30 mg L-1 to 0.03 mg L-1. The …
A Bibliometric Analysis of Research on Selenium in Drinking …
The lack of terms directly related to possible technologies for selenium removal from water during the analysis of the most frequently used keywords was at least partially solved when the cluster Adsorption was examined (Figures S7 and S9). This cluster appeared in the third subperiod (2012–2019) and had continuity until the last …
Recent advances in technologies for removal and recovery of selenium
Current industrial efforts for selenium removal are mainly based on biological and chemical approaches, whereas physical methods (e.g., nanofiltration and reverse osmosis) have not captured much ...
Selenium removal from petroleum refinery wastewater …
Selenium removal efficiency vs time for a current density of 153.4 A m −2. Other authors have reported selenium removal efficiencies of about 90% the treatment of wastewater from copper industry by EC with an initial concentration of selenium of 5 mg L −1 using a treatment time of 20 min and a current density 50% lower than that used ...
Phillips 66's Selenium Removal Technology
Existing technologies for selenium removal are complex, costly and usually inadequate, especially considering the likelihood that regulations controlling selenium discharge will continue to tighten. Phillips 66's SeRT ® technology is a simple, fixed-bed process that looks and runs like many other refinery processes, SeRT ® technology is not ...
Methods for selenium removal from contaminated waters: a …
Here, we review methods for selenium removal from water, wastewater, and industrial effluents. Technologies are based on zero-valent iron, iron-oxy-hydroxides, supported materials, nanofiltration ...
A Non-Biological Process for Selenium Removal from …
A Non-Biological Process for Selenium Removal from Industrial Wastewater. Posted by ChemTreat On 07/27/2020. One of the primary, and heretofore costly-to-remove, contaminants in coal-fired power plant wastewater streams is selenium. Concerns now abound regarding selenium toxicity in other streams, including mine …
Technologies to Remove Selenium from Water and Wastewater
Selenium is used as a paint and varnish remover, and as a solvent for rubber resins and other organic substances. Selenium catalysts, due to their high efficiency, moderate reaction conditions, good functional compatibility and excellent selectivity, have attracted a lot of interest over the past two decades as recently …
Selenium Removal Key to Water Reuse
USBR investigated selenium removal technologies from 2003 to 2006. Investigations included laboratory bench-testing and field pilot-testing to reduce selenium concentrations in local agricultural drainage water near Firebaugh, California. USBR issued a Record of Decision in 2007, which selected a drainage alternative based upon a reverse ...
Mathematical Modeling of Biological Selenium Removal …
Recently, sorption processes have been successfully used for selenium removal. The operating cost for media and maintenance for sorption processes may be high and should be considered in the life ...
Selenium Removal from Water and Wastewater by …
The Se removal efficacy can be enhanced by: 1) Combining biological treatment with chemical or physical methods to optimize Se removal and to ensure …
Frontiers | Thermodynamic insights into selenium oxyanion removal …
Temperature-swing solvent extraction (TSSE) is a cost-effective, simple, versatile, and industry-ready technology platform capable of desalinating hypersaline brines toward zero liquid discharge. In this work, we demonstrate the potential of TSSE in the effective removal of selenium oxyanions and traces of mercury with the coexistence of …
Selenium Removal by SMI | Prima Environmental
The wastewaters were used "as received" or pre-treated. Tests ran for about 120 bed volumes with an empty bed contact time (EBCT) of 10-20 minutes. Selenium removal efficiency was highly dependent on the wastewater, ranging from poor removal to removal (see Table). Based on the results of the screening level tests, field pilot tests ...
Selenium removal from water using adsorbents: A critical …
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 …
Selenium Removal from Industrial Wastewater | Water …
The data from another bench-scale test outlines an example of selenium reduction potential from oil refinery wastewater: 24.4 μg/L from untreated wastewater; . 2.5 μg/L from treated wastewater. In many states (California, for example), groundwater is being regulated for selenium discharge, creating challenges for industrial facilities.
Kinetics study of selenium removal from copper …
The solution to the removal circuit has a typical composition of 100 g/L copper sulfate, 125 g/L sulfuric acid and, reporting at most 100 mg/L of selenium. It was reported by Qin (2005) that 20 to 40% of the selenium to …
Dissolved‑selenium removal using magnetic nanoparticles: …
Schematic of dissolved‑selenium removal using nano-magnetic particles. 2.1. Nanosized zero-valent iron (nZVI) Zero-valent iron (ZVI) is a ubiquitous substance in nature, which can be used as a removal agent for a variety of pollutants [38, 39].
7 Science-Based Health Benefits of Selenium
This article outlines 7 health benefits of selenium, all backed by science. 1. Acts as a powerful antioxidant. Antioxidants are compounds in foods that prevent cell damage caused by free radicals ...
Selenium Wastewater Removal & Treatment | ChemTreat, Inc.
Selenium Removal for Electrical Utilities. SeQuester can be employed to remove selenite and selenate from power plant flue gas desulfurization (FGD), ash-sluicing, ash pond, and landfill leachate wastewaters. It also reduces the concentration of other priority pollutants in these water streams under standard operating parameters.
Review on environmental selenium: Occurrence, public …
A follow-up pilot-scale study done by Cantafio et al. (1996) used a packed-bed bioreactor inoculated with the bacterium Thauera selenatis for the removal of selenium from the drainage wastewater and achieved a removal rate and performed a complete conversion of selenate to elemental selenium. The removal of selenium was …
Study of iron-based metal–organic framework for selenite removal …
The whitish–yellow obtained product, i.e., MIL-53 (Fe) was then recovered and used for carrying out all selenium removal experimentation. Selenium removal study Adsorption experiment. About 0.1-mg/mL adsorbent dosage, i.e., 20 mg of MIL-53 (Fe) was ultrasonicated in 200-mL solution with different selenite concentrations. About 7 mL of …
Electrochemical Evaluation of Selenium (IV) Removal from …
The removal of selenium from superficial and waste water is a worldwide problem. The maximum limit according to the World Health Organization (WHO) for the selenium in the water is set at a concentration of 10 μg/L. Carbon based adsorbents have attracted much attention and recently demonstrated promising performance in removal …
Selenium Removal from Wastewater| Veolia
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 precipitate target compounds. The result is a highly efficient biological system that can remove 99%+† of selenium, nitrate, and other ...
Selenium Removal from Wastewater by Microbial …
Selenium removal from wastewater mainly involves microbial reduction of water-soluble Se oxyanions (SeO 3 2− and SeO 4 2−) to water-insoluble elemental selenium (Se 0). The microbial reduction can be enhanced with additional sources of electron donors such as sugar, organic acids, humic substances, or alcohol [ 10 ].
Application of Fe-biochar composites for selenium (Se+6) removal …
Selenium in selenite (SeO 3 2−) is in the +4 oxidation state and it can be removed by conventional water treatment. Whereas, a more complex approach is necessary for the removal of selenium in the +6 state form, as selenate (SeO 4 2−) (Etteieb et al., 2020). One method for selenate removal is by reduction through the use …
A potent insight into the microalgal and surface-modified
Integration of microalgae with nanoparticles used in the removal of chromium and selenium metal ions was discussed in the present review with the removal mechanism. The economic perspectives, advantages and challenges of using the integral magnetic microalgal system in the treatment process were also evaluated in the present …
