Coal-fired O&M: A novel, non-biological process for selenium removal

Direct Selenium Removal. ... Once this first stage is complete, the liquid stream is routed to a second set of reaction tanks and is treated with co-precipitating agents that, as the name implies ...

Sequential removal of selenate, nitrate and sulfate and …

Developing a stepwise bioprocess to reduce oxyanions may be a promising approach to remove selenate, nitrate and sulfate from wastewater. In the stepwise …

Effect of Biological Activities on Selenium Removal by …

A selenium removal efficiency of 92% was achieved in a bioreactor with initial biomass of 2.2×106 cells/g AIAA after a 70-day operation period. Little improvement was observed by lowering the influent Se(VI) concentration from 50 to 10 mg/L, while the removal efficiency was significantly enhanced by either extending the HRT from 3.2 to 5.0 ...

Recent advances in technologies for removal and recovery of …

Selenium (Se) is distributed into different environmental compartments by natural and anthropogenic activities, and generally discharged in the form of selenate [S …

TREATMENT STAGES FOR SELENIUM REMOVAL

Methods and apparatus relate to treating fluid to at least reduce selenium content within the fluid. The treating includes conditioning stages to alter a composition of the fluid prior to removal of the selenium content from the fluid. The composition of the fluid after the conditioning stages facilitates the removal of the selenium content or at least limits …

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 via Direct …

The Mauter group has developed a method for removing selenium ions from wastewater using direct electrochemical reduction (DER). Selenium species are released into aquatic environments through anthropogenic activities such as mining, agriculture, and power generation. To comply with EPA discharge guidelines, biological and physiochemical ...

(54) REMOVAL OF SELENIUM FROM ACIDIC

57 ABSTRACT. Selenium (IV) and selenium (VI) are removed from acidic copper-nickel sulphate solutions in a two-stage process by adjusting and maintaining the sulphuric acid content of the solution in a range of 10 to 50 g/L and, in. a first stage, contacting the solution with sulphur diox.

Evaluation of foliar application of selenium and flowering stages …

Table 1 The effect of selenium sources and flowering stages on some morphological characteristics of Echium amoenum. Full size table In this experiment, flower diameter was affected by flowering ...

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, ... stage MBBR with K1 media. Glucose …

Selenium Removal from Industrial Wastewater

A New Physical/Chemical Process. A proprietary and patent-pending process from ChemTreat called SeQuester ™ offers a physical-chemical alternative to the biological method of selenium removal that …

Treatment stages for selenium removal

Methods and apparatus relate to treating fluid to at least reduce selenium content within the fluid. The treating includes conditioning stages to alter a composition of the fluid prior to removal of the selenium content from the fluid. The composition of the fluid after the conditioning stages facilitates the removal of the selenium content or at least limits …

Biological Removal of Selenate and Selenite from …

Thus, a solid-separation stage is often required to remove and recover biogenic Se(0) in the downstream of bioreactors treating selenium oxyanion-containing …

Selenium removal from mining and process wastewater: a …

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 …

Selenium Removal from Industrial Wastewater

Selenium is by now a well-known pollutant, present in various coal and hard-rock mines and some thermal power plant effluents through the world. Veolia has …

Mechanisms of selenium removal by partially oxidized …

Anthropogenic-driven selenium (Se) contamination of natural waters has emerged as severe health and environmental concern. Lowering Se levels to safe limits of 40 μg-L −1 (recommended by WHO) presents a critical challenge for the scientific community, necessitating reliable and effective methods for Se removal. The primary …

Insight of particulate arsenic removal from coal-fired …

1. Introduction. Arsenic is one of the most volatile and potentially toxic elements to be released from coal-fired power plants. Arsenic is primarily volatilized as As 2 O 3 (g) during high-temperature combustion process [1], [2], more than 80% of which is partitioned into the fly ashes afterward and eventually captured by dust removal device …

Effects of foliar application of selenate and selenite at …

Since the potato is a new staple food in China, the production of selenium (Se)-enriched potato may be an effective approach for Se supplementation in Se-deficient populations. Herein, we biofortified potato via the foliar application of sodium selenate and sodium selenite at three growth stages and …

Laboratory-scale bioreactors for soluble selenium removal from selenium

Selenium removal efficiency of 85% was attained at pH 5.0 with 100 mg/L selenium concentration. The increase in resin dose was found to increase removal efficiency. However, metal uptake decreased.

Methods for selenium removal from contaminated waters: a …

An iron coprecipitation unit at the industrial scale. This technology is a well-known and well-accepted chemical process for the removal of metals and metalloids, including the …

Mathematical Modeling of Biological Selenium Removal …

these units are typically specifically sized for a final volume reduction stage prior to discharge to ... wastewater treatment for selenium removal, including anoxic/anaerobic fixedfilm ...

Selenium Removal from Water and Wastewater by Different …

The removal efficiency of Se from wastewater by GAC was 78% at pH 7, reaction time 4 h, and 2.5 g/L of the adsorbent ( 29 ). Selenite removal efficiency reached above 90% after 6 h adsorption for the initial Se level of 2 mg/L and equilibrium was …

Methods for selenium removal from contaminated waters: a …

An iron coprecipitation unit at the industrial scale. This technology is a well-known and well-accepted chemical process for the removal of metals and metalloids, including the removal of selenium and arsenic, and has been widely implemented in various industries; briefly, a ferric salt is added to the effluent, forming an amorphous iron oxyhydroxide precipitate; …

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 ...

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 …

Treatment technologies for selenium contaminated water: A …

In nature, selenium exists in large quantities in ore, sedimentary rocks, fossil fuels and the soil of volcanic mountains (Khoei et al., 2017).Although the Se content in …

Sequential removal of selenate, nitrate and sulfate and …

In the first stage of the process (FBR1), ORP feedback control was used to optimize ethanol dosage for selective and efficient selenate and nitrate removal over sulfate reduction, allowing the ...

Methods for selenium removal from contaminated waters: a …

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. Moreover, the efficiency of remediation methods depends on selenium speciation and water parameters, e.g. pH and concentration of …

Effect of Biological Activities on Selenium Removal by

Se(VI) and Se(IV) are the two major species of selenium in water. They are toxic to aquatic lives and human beings at high levels. Biological reduction of Se(VI) is a two-stage process, first from ...

(PDF) Optimization of ABMet Biological Selenium Removal …

Optimization of ABMet Biological Selenium Removal through Advanced Process Modelling. January 2016. Proceedings of the Water Environment Federation 2016 (11):949-961. DOI: 10.2175 ...

Dissolved‑selenium removal using magnetic nanoparticles: …

1. Introduction. Selenium (Se) is a non-metallic chemical element with a red amorphous, glassy, and monoclinic crystal state and is one of the trace elements required by the human body [1].As playing a vital role, it acts to enhance human immune function, increase anti-oxidation, delay aging, and effectively inhibit tumor growth.

Microbiological selenate to selenite conversion for selenium removal

Bacteria can reduce selenate to selenite, but also further to elemental selenium, selenide or organic selenium. In this paper, we aim to exclusively bio-reduce selenate to selenite in an open high-rate bioreactor. This conversion could be part of a two-stage process in which the selenite is subsequently reduced by chemical means under …

TREATMENT STAGES FOR SELENIUM REMOVAL

TREATMENT STAGES FOR SELENIUM REMOVAL . United States Patent Application 20110203993 . Kind Code: A1 . Abstract: Methods and apparatus relate to treating fluid to at least reduce selenium content within the fluid. The treating includes conditioning stages to alter a composition of the fluid prior to removal of the selenium content from the fluid.

Treatment technologies for selenium contaminated water: A …

Various treatment technologies such as precipitation and coagulation, adsorption, membrane separation, chemical and electrochemical reduction, bioremediation, and phytoremediation thus have been developed and applied to remove selenium from wastewater, drinking water, and groundwater ( Staicu et al., 2015a; Su, 2017 ).

Removal of Selenium from Petroleum Refinery Wastewaters

Removal of selenium is dependent on its speciation and on concentrations of other contaminants in the wastewater. Iron coprecipitation, in which iron salts are added to the wastewater and selenium is removed on the surface of precipitated iron hydroxide, is most effective at removing selenite. Selenate is more loosely bound to iron hydroxide ...

Evaluation of foliar application of selenium and …

Selenium is essential element for human and animal health due to the activation of antioxidant defense systems 2. In addition, it shows a narrow range between de˜ciency (< 40 μg day −1 ) and ...

Laboratory-scale continuous reactor for soluble selenium removal …

A model continuous flow bioreactor was constructed for removing toxic soluble selenium (selenate/selenite) of high concentrations using a selenate-reducing bacterium, Bacillus sp. A model continuous flow bioreactor (volume 0.5 L) was constructed for removing toxic soluble selenium (selenate/selenite) of high concentrations using a …

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 ...

Treatment stages for selenium removal

Treatment stages for selenium removal . United States Patent 8974676 . Abstract: Methods and apparatus relate to treating fluid to at least reduce selenium content within the fluid. The treating includes conditioning stages to alter a composition of the fluid prior to removal of the selenium content from the fluid.