Desulfurization: critical step towards enhanced selenium removal from industrial effluents. Chemosphere (2017) ... 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 effect, recyclability and reusability of the adsorbent. ...
The removal of selenium from complex industrial wastewaters such as the FGD effluents by adsorption is a promising process provided efficient pre-treatment steps are …
Overview. It is well established that higher concentrations of selenium in drinking water are toxic to both humans and aquatic life.Selenium is widely used in the production of photocells, rectifiers, xerography equipment, paint, glass, and …
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 management for mining, …
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 ...
Adsorption process and co-precipitation is a promising technology for the industrial application of selenium removal [17]. The advantage of this process goes beyond easy-to-implement, but also includes ... The presence of organic selenium in trace quantities in effluents from industries such as mining and coal-fired power plants is an emerging ...
Schematic depicting GE Water's ABMet biological process for selenium removal. The FBR is an upflow attached growth system in which water passes through a granular solid medium at a high enough velocity to suspend the media. This provides maximum contact between contaminants and the bacteria attached to the medium. Typical media used are again ...
In biological treatment of selenium-containing wastewaters, a significant fraction of the biogenic elemental selenium nanoparticles (SeNPs) remains in the bioreactor effluents due to their colloidal nature (Buchs et al., 2013).This not only compromises the discharge criteria of the treatment process, but also raises the concern on the fate of discharged biogenic SeNPs …
SeQuester is a targeted physical chemical process designed to remove selenium from effluent water in industrial wastewater applications. This innovative selenium removal technology reduces selenium concentrations via chemical and physical methods while helping avoid capital expenditures by transferring costs towards operations and maintenance.
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 …
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 …
par-ticular, 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 groundwater and industrial effluents because selenium is often present in complex polycontaminated mixtures, thus
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
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 groundwater and industrial …
Because of new environmental permit requirements, PCR evaluated a number of candidate technologies for Se removal and selected co‐precipitation for testing. The novelty of the …
The results show that MBBR can be a viable solution for biological selenium removal as well as nitrate removal from FGD and mine effluents. By combining the MBBR with traditional chemical treatment, very low effluent selenium
The use of hay and sawdust to promote the removal of selenium and nitrate in coal mine drainage: A saturated up flow column experiment ... (aeration) versus microbial processes. Evaporation is the dominant removal mechanism for BTEX, lower-molecular-weight SHC, and possibly the naphthalenes in the dissolved air flotation (DAF) cells/s and ...
The research shows that the RBC is very effective in the removal of ammonium (NH4-N) from simulated mining effluents in the temperature range of 4.5 to 24oC and pH values ranging …
Selenium is present in various coal and hard-rock mines and some thermal power plant effluents throughout the world. Selenium in wastewater effluent can be a major issue due to the complexity of its removal as well as the possibility …
This has practical implications on industry to achieve the stringent selenium regulatory discharge limit of 5 μg Se L −1 for selenium containing wastewaters set by the United States Environmental Protection Agency. Over the last few decades, various technologies have been developed for the treatment of selenium-containing wastewaters.
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,
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
Bioremediation of Selenium Contaminated Wastewater Eric D van Hullebusch, This book features the reduction and removal of selenium in wastewater via bioremediation. Arranged over five chapters, this book provides information regarding the interaction between micro-organisms and selenium, and it also explains the biogeochemistry of
Continuous discharge of industrially impaired waters from activities such as coal-fired power plants wastewater, mining drainage, oil refinery effluents, and agricultural runoff contributes to the emergence of aquatic selenium (Se) pollution (Guo et al., 2023).Excessive exposure to Se at 400 μg d −1 has been recognized as having toxic effects, leading to both …
While existing regulations limit selenium concentrations in water to 50 parts-per-billion, industrial effluents (e.g. flue gas desulfurization, mining wastewater, coal power plants) are often required to achieve levels below 10 parts-per-billion. ... This is the first time that a technology for selenium removal combines novel methods in ...
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 of zero-valent iron (ZVI).
30 31 Keywords 32 photocatalysis, passive treatment, organoselenium, organic, selenium, selenomethionine, 33 selenate, mine water, toxicology 34 35 1.0 Introduction 36 Selenium (Se) is an emerging contaminant of concern present in effluents from the processing and 37 consumption of sulfurous ores, including coal mining and power generation; metals mining …
Increasing evidences suggest that zero-valent iron (ZVI) is an effective reagent for the treatment and removal of selenium from mine water.
groundwater and industrial effluents because selenium is often present in complex polycontaminated mixtures, thus ... selenium removal from water, wastewater, and industrial effluents ...
In mining and coal-fired power plant effluents, selenium is mainly found in the form of selenate (Se [VI]) and selenite, ... -N were depleted in the first MBBR, while most of the selenium removal took place in the second reactor. Parameter FGD effluent Coal mine effluent Copper mine effluent Selenate (ppb) 237 Selenite (ppb) <5--469 9.5
SeO 4 2-removal by biofilms formed from an anaerobic sludge inoculum was investigated in the presence of NO 3-and SO 4 2-using drip flow reactors operated continuously for 10 days at pH 7.0 and 30 °C. The highest total Se (∼60%) and SeO 4 2-(∼80%) removal efficiencies were observed when the artificial wastewater contained SO 4 2-.
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 ...
This work achieved a maximum selenium removal rate of 54.13% corresponding to the highest hydraulic residence time (almost 47 days). Typha Latifolia was efficient for selenium assimilation and removal from mine effluent. 4.4% of Se mass was accumulated in the under and aboveground biomass while 32.2% was volatilized.
