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Treated effluents from flue-gas-desulfurisation from coal combustion power plants can contain ppm levels of selenium, most commonly as selenate, but as much as 1 g l1 of sulfur in the form of sulfate 5. ... special attention is paid to the removal of selenium ions
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, nutri
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 exhibited a strong ...
Jan 17, 2014 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 concentrations can be reached. With so much focus on the selenium regulations, having a biological solution offers
Describe successful case studies of Se removal applied to aqueous effluents at the commercial or pilot stage, as well as cases of scaling up to full scale for these industry sectors Power generation Mining and agriculture Oil and gas Treatment is only one of three approaches for selenium removal Prevention Source ...
The removal of selenium from aqueous medium is complex and expensive, because of the high wastewater volumes generated, low discharge limits even in gL and the presence of SeIV and SeVI species Santos et al. 2015.As regulatory limits are becoming stricter, selenium removal from wastewater has become more and more challenging.
Apr 01, 2017 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 deployed. Because of the structural similarity of various chemical species e.g., sulfate and selenate, ion exchange resins could be easily exhausted, thus limiting their ...
Effluents of sour water strippers are difficult to treat for selenium removal because of the unpredictable nature and unpredictable quantities of contaminants that are present in the effluents. These contaminants often hinder irreversibly selenium removal processes that use membrane, ion exchange resins or inorganic adsorbents.
Effective and reliable treatment is needed to treat selenium Se in petroleum refinery effluents to meet water discharge limits established under the Clean Water Act through the National Pollutant Discharge Elimination System. As a byproduct of
A prototype algal-bacterial selenium-removal system reduced the selenium content in water from 367 ppb influent selenium to 20 ppb effluent. Chemical processes. Chemical treatment processes refer to the use of chemicals to remove trace elements from polluted wastewater. Chemicals are frequently used for industrial wastewater treatment but ...
The removal of selenium from complex industrial wastewaters such as the FGD ef uents by adsorption is a promising process provided ef cient pre-treatment steps are deployed.
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
Desulfurization Critical step towards enhanced selenium removal from industrial effluents. Staicu Lucian. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER.
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 removal rate of 54.13 ...
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 ...
be designed to accommodate bioreduction of selenium ions by specific bacteria strains. Treatment of large volumes of slurry waste is necessary to separate the solid elemental selenium. Physical separation methods have also been explored for selenium remediation, but only reverse osmosis and nanofiltration seem to decrease the concentration of
Traditional Se removal technology has usually been coprecipitation with iron salts to form ferric hydroxide FeOH 3 , or with other chemical additives. Since groundwater containing ferrous iron Fe 2
Feb 24, 2007 Nov 21, 2013 Selenium finds extensive application in the manufacture of photocells, rectifiers, xerography equipment, paint, glass and insecticides. Selenium concentration in industrial effluents may vary from 1 to 7000 gL. This paper reviews various treatment technologies for the removal of selenium from water and wastewater such as sedimentation, filtration, activated carbon