Enhanced Adsorption of Selenium Ions from Aqueous Solution
The aim of this research was to investigate the potential of raw and iron oxide impregnated carbon nanotubes (CNTs) as adsorbents for the removal of selenium (Se) ions from wastewater. The original and modified CNTs with different loadings of Fe 2 O 3 nanoparticles were characterized using high resolution transmission electron microscopy …
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Selenite Removal from Water
removal capacity at Ce = 10 μg/L (Q10 value), maintaining (not modification) the physicochemical characteristics of the water, and estimation of treatment cost—the water flow rate and specific requirements of treatment proce ss should be also considered. The majority of selenium removal treatment technologies are suitable for wastewater ...
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Selenite and Selenate Removal by a Functionalized …
selenium removal (Golder, 2009). However the market continues to look for new innovation in selenium removal to mitigate issues of ease-of-use, capital cost, ancillary waste streams and the ability to reach low selenium levels discharge with these technologies. Adsorbent technology has been identified that addresses many of these issues.
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Emerging nanomaterials for the application of …
This review article provides a summary of current selenium removal technologies, highlights the gaps in these current technologies and focuses on emerging nanomaterials capable of removing selenium oxyanions …
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Selenium Removal Key to Water Reuse
Selenium Removal Key to Water Reuse and Sustainable Agriculture in the Central Valley. By Rich Stratton, PE - Senior Project Manager, Folsom, CA. Figure 1: Kesterson National …
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Rapid adsorption of selenium removal using iron …
The data revealed that the optimum conditions for the highest removal (95.6%) of selenium were observed at pH 8.5, adsorbent dosage of 25 mg, and contact …
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Research and Industrial Application of Selenium and
Selenium can occur in four oxidation states: selenide (−2), elemental selenium (0), selenite (+4), and selenate (+6). In general, selenate has a high solubility and is the most mobile in water, which is challenging for both selenium removal and recovery. Selenium Control. Selenium control in solution discharge is necessary and critical for ...
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Selenium Removal Key to Water Reuse
Figure 6: Selenium removal processes 1. ABMet Process 2. Plate Settler 3. UF System 4. Pressure Filters 5. Reverse Osmosis Systems 1 3 5 2 4 backwash recycle streams. The effluent from the plate settler is sent to both a media filter and UF system to allow for a comparison of their performance as a
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Migration and emission behavior of arsenic and selenium in …
The selenium valence of sludge was found to be Se 4+ (not shown), which confirmed that selenium compounds in wastewater removed by the triplet-tank method were mainly in the form of Se 4+. Thus inhibition of Se 4+ oxidation in wastewater was conducive to selenium removal by the triplet-tank method. (5) Ca 2 + + SeO 3 2-(Se 4 +) = CaSeO …
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TECHNOLOGIES AND POTENTIAL TECHNOLOGIES FOR …
Summary of Selenium Removal Technologies. A summary of treatment technologies that are applicable or may be applicable for selenium removal from wastewater is presented in Table 1. Because of the large number of publications on selenium only a very brief summary for each technology will be discussed in this presentation.
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Methods for selenium removal from contaminated …
selenium concentrations are usually below 0.1 mg/L; or whether this is Se in industrial euents with concentrations above 1 mg/L. Noteworthy, in both cases, euents contain-
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Selenium removal from mining and process wastewater: a …
The removal of selenium from aqueous medium is complex and expensive, because of the high wastewater volumes generated, low discharge limits (even in μg/L) and the presence of Se(IV) and Se(VI) species (Santos et al. 2015).As regulatory limits are becoming stricter, selenium removal from wastewater has become more and more challenging.
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Removal of selenate from brine using anaerobic bacteria …
Such low concentrations are required since selenium bioaccumulates up the food chain (Stewart et al., 2010) and can cause teratogenic effects in fish and birds (Janz et al., 2010). Removal of the dissolved and most mobile form of selenium, selenate (SeO 4 2−), can be achieved using biological reductive processes (Tan et al., 2016). But this ...
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Selenium Pollution in the Marine Environment and Marine
Although biovolatilization of selenium is an important approach as it is a natural biogeochemical method for removal of selenium, the major disadvantage with this method is mobilizing selenium up the food web. ... Geomicrobiol J 20:587–602. CrossRef CAS Google Scholar Hesketh J (2008) Nutrigenomics and selenium: gene expression …
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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. The MBBR does not require back-washing; it can tolerate high suspended solids concentrations in the feed and is not …
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Near Quantitative Removal of Selenate and Sulfate Anions …
Crystal structure of BBIG·SeO 4 . (a) Thermal ellipsoid plot (50% probability level). Hydrogen atoms on the water molecules are omitted. (b) Hydrogen-bonding clusters between the selenate ions ...
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Dendrimer functionalized graphene oxide for selenium removal
The resulting products were applied in selenium removal from simulated waste water, showing an increasing capacity with increasing the generation of dendrimers. The 4th generation of PAMAM-GO (GO-G4) shows a removal capacity of 60.9 mg g −1 in Se (IV) and 77.9 mg g −1 in Se (VI) at pH 6. The adsorption mechanism is mainly …
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Selenium Removal from Industrial Wastewater
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 …
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Simultaneous removal of selenite and heavy metals from …
The other studies focused merely on the biological removal of selenium oxyanions without considering the recovery aspect. For successful application of the biological method to treat selenite rich wastewater at industrial scale, evaluation of the effect of co-pollutants on the treatment efficiency is necessary. The effect of heavy metals, such ...
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Solving the selenium problem
Selenium removal technology. Achieving these new levels is easier said than done. Selenium is a slippery, multi-headed problem for mining. For starters, any technology has to treat large volumes of water to remove tiny traces of selenium. Any given wastewater can contain various selenium species with different solubility, toxicity and ...
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Selenium Removal from Industrial Wastewater
A critical issue at coal-fired power plants — those remaining and many of those that have shut down — is how to remove selenium from wet scrubber effluent and ash pond wastewater.
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(PDF) Chemical-Free Recovery of Elemental Selenium from …
Chemical-Free Recovery of Elemental Selenium from Selenate-Contaminated Water by a System Combining a Biological Reactor, a Bacterium-Nanoparticle Separator, and a Tangential Flow Filter October 2018
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Microbial Enhancement of Selenium Removal in Chemically …
Selenium (Se) is an essential micro-nutrient for living organisms, but elevated concentrations in water can adversely affect health. In this research, we investigate the removal of selenium oxyanions (selenate and selenite) in aqueous systems by integration of adsorption on modified zeolites and microbial reduction. Dynamic sorption …
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Treatment technologies for selenium contaminated water: A …
In the tested five different substrate arrangements, the authors found the most efficient selenium removal was obtained for cattails growing in a substrate of cattail litter overlying sand and peat moss sediment, in which water column selenium was decreased from 15 μg Se/L to <0.1 μg Se/L in 72 h. The addition of alfalfa hay or alfalfa …
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Selenium Removal Using a Moving Bed Biofilm …
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 …
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FINAL-NAMC-SWG Removal Technologies
This document describes industry-specific approaches to prevention, control and removal of selenium in water, with a focus on water treatment approaches for selenium removal. …
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Simultaneous removal of selenite and heavy metals from …
Occurrence of selenium oxyanions and different heavy metals as co-pollutants in various waste streams is common from industries such as mining, coal burning, thermal power plants, petrochemical refinery, etc. Among the available technologies to treat such wastewater, biological removal using anaerobic microbes is one of the most …
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Selenium Wastewater Removal & Treatment
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 …
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Study of iron-based metal–organic framework for selenite removal …
Selenite (SeO32−, Se (IV)) as well as selenate (SeO42−, Se (VI)) are the main forms of selenium existing in the aqueous media and acknowledged to upshot critical mutilation to well-being on surplus intake. Water is considered as one of the supreme itineraries for selenium inlet because of its adulteration with selenium via geogenic and …
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Novel CTAB functionalized graphene oxide for selenium removal
This study explored the potential of cetyltrimethylammonium bromide functionalized graphene oxide (CTAB@GO composite) to remove selenite and selenate from wastewater, given the health hazards related to selenium. It demonstrated outstanding adsorption capacities of 140 and 468 mg/g for selenite and selenate respectively, …
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