Biological Removal of Selenate and Selenite from …
Though several physico-chemical methods are available to treat selenium oxyanion-containing wastewater, biological methods have gained significant importance due to their …
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Removal and recovery of selenium species from wastewater: Adsorption
Removal of the trace inorganic and organic selenium compounds from the biological treatment effluent is a new challenge faced by the industries as stringent guidelines based on bioaccumulation of selenium in fish is now stipulated by environment protection agencies worldwide.
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Performance of constructed wetland for selenium, nutrient …
However, for mine effluents having a predominance of selenate (almost 90%), the iron ratio was increased to 2% to reach a final selenium concentration inferior to 0.0005 mg/L. Low temperature (4 ...
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Recent advances in technologies for removal and recovery of selenium
The most detailed pilot study of the use of CW for selenium removal was conducted recently by Zhao et al. (2020a, 2020b), in which 4 different experimental arrangements were used for observing the effect of various parameters on Se removal. The effects of organic amendments and alternating wet/dry cycles were closely monitored over 8–20 days.
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[PDF] Selenium Removal by Constructed Wetlands: Role of …
Selenium-laden effluents from oil refineries are polluting San Francisco Bay, California. One environmentally friendly way of cleaning up selenium (Se) from effluents is by plant and microbial Se volatilization using constructed wetlands. Using mesocosms, we investigated the role of biological Se volatilization in a 36-ha constructed wetland located …
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Removal and recovery of selenium species from wastewater: …
This study investigates the effectiveness of four adsorbent candidates, including nano-zerovalent iron (nZVI), magnetite (Fe 3 O 4), ferric chloride (FeCl 3) and granular …
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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 from aqueous streams, only a …
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Selenium Removal Using a Moving Bed Biofilm Reactor
An MBBR is a biological method to remove selenium that can operate with the same support material for over 20 years, while granulated activated carbon in other biological …
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A potent insight into the microalgal and surface-modified …
C. vulgaris was used in the selenium removal process, ... Researchers have tried to implement selenium-enriched algal growth to treat the selenium-contaminated effluents discharged into the water bodies. Though selenium was removed with enhanced efficiency, the threat of selenium inside the algal cells to enter into the aquatic food chain has ...
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Recent advances in technologies for removal and recovery of selenium
Coal combustion for power generates volatile selenium species and selenium-enriched waste (fly ash, bottom ash, scrubber ash). Coal is currently one of the most significant energy sources, accounting for 40% of the global primary energy share.
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Selenium Removal Using a Moving Bed Biofilm Reactor
An MBBR is a biological method to remove selenium that can operate with the same support material for over 20 years, while granulated activated carbon in other biological methods may need to be replaced regularly.
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Advancement in Non-Biological Selenium Removal …
Sources and speciation of selenium in industrial effluents In the mining and metal production sector, selenium contamination of waste water results from the release of selenium from the …
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LITERATURE REVIEW OF TREATMENT TECHNOLOGIES …
Selenium speciation and therefore remediation is highly dependent on pH and redox potential (Eh). A simplified selenium-water system Pourbaix diagram showing major thermodynamically stable selenium species as a function of pH and Eh is shown in …
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Advancement in Non-Biological Selenium Removal …
Sources and speciation of selenium in industrial effluents In the mining and metal production sector, selenium contamination of waste water results from the release of selenium from the mineral deposit.
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Removal of Selenium by Reduction to Selenite and …
power plant effluents throughout the world. Veolia Water Technologies Canada has developed the TracerTM 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 oxyhydroxide,
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Performance of constructed wetland for selenium, nutrient …
Passive biological treatment using constructed wetlands has been employed as a cost-effective and environmentally friendly alternative for mine effluents treatment in Canada. The current work aimed to assess the performance of a laboratory-scale constructed wetland for the removal of selenium, nutrients and heavy metals.This work achieved a maximum selenium …
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Desulfurization: Critical step towards enhanced selenium removal …
Selenium is difficult to remove from groundwater and industrial effluents because selenium is often present in complex polycontaminated mixtures, thus inducing competition issues with other anions.
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Removal of Selenium by Reduction to Selenite and …
Selenium is now a well-known pollutant, present in various coal and hard-rock mines and some thermal power plant effluents throughout the world.
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Biological Removal of Selenate and Selenite from Wastewater…
Though several physico-chemical methods are available to treat selenium oxyanion-containing wastewater, biological methods have gained significant importance due to their capability to convert selenium oxyanions to elemental selenium nanoparticles.
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Recent advances in technologies for removal and recovery of selenium
During data pooling, 4 studies were selected based on applicability of selenium removal via CW. Out of these 4, 3 studies particularly deal with the removal of total selenium while only one study presents separate REs for selenite and selenate.
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Use of a rotating biological contactor for removal of …
3.3. Removal of selenium (Se) from smelter effluents Selenium is often present in effluents from zinc hydrometallurgy circuits. Various microorganisms have been found to be effective in the reduction of selenium oxyanions to elemental selenium. McCready et al. (1990) studied the removal of selenium from weak
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Selenium-rich mine effluents treatment using zero-valent …
Selenium contamination in mine effluents is a notorious environmental concern due to its toxicity and potential to bioaccumulate. This element is not yet regulated in Canada, and requires the ...
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Technologies to Remove Selenium from Water and Wastewater
Typical conventional biological technologies that have been applied for the removal of selenium include created wetlands involving phytoremediation, volatilization, reduction and adsorption in sediments, algal-bacterial removal, and biological removal using dissimilatory metal reducers.
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Desulfurization: Critical step towards enhanced selenium removal …
Selenium (Se) removal from synthetic solutions and from real Flue Gas Desulfurization (FGD) wastewater generated by a coal-fired power plant was studied for the first time using a commercial iron oxide impregnated strong base anion exchange resin, Purolite ® FerrIX A33E. In synthetic solutions, the resin showed high affinity for selenate and selenite, while sulfate …
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Advancement in Non-Biological Selenium Removal …
Sources and speciation of selenium in industrial effluents In the mining and metal production sector, selenium contamination of waste water results from ... be applied broadly to remove selenium to reach limits below 3 μg/L unless the stream only contains selenium as selenite. This paper was presented at WEFTEC 2017
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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, reverse osmosis, chitosan-enhanced ultrafiltration, electrodialysis, and activated granular sludge.
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Technologies to remove selenium from water and …
Selenium is ubiquitous in the environment, and the two main sources of human exposure by Se are food and water. Se, a metalloid, is an important micronutrient
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Technologies to Remove Selenium from Water and Wastewater
Here, we review selenium occurrence, pollution, properties and remediation. Advanced remediation include technologies based on zero-valent iron, iron-oxy-hydroxides, supported …
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Technologies to Remove Selenium from Water and Wastewater
Speciation of selenium in groundwater or in a raw effluents plays an essential role in the effectiveness of treatment methods used for Se removal, especially because selenium is often present at low concentrations, less than 1 mg/L (Fernández-Martínez and Charlet 2009; BRGM 2011; Santos et al. 2015). Most of the current research focuses on Se ...
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Field Evaluation of Arsenic and Selnium Removal by Iron …
and selenium from ash pond effluents. Full project details may be found elsewhere.1 BASIC CHEMISTRY Arsenic exists in the -III, 0. -Fill, and +V oxidation states in ... Selenium removal generally increased with increasing iron dose and decreasing overflow rate. Figure 6 shows how effluent dissolved selenium and effluent
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