Laboratory studies were performed to determine optimum conditions for using activated alumina to remove selenium from drinking water supplies. Column tests showed that the capacity of alumina for Se IV decreased as influent pH increased. Best removal of Se IV occurred at pH 5 where 1200 bed volumes of water, with influent concentration of 0.2 ...Application. Activated Alumina can also be used to adsorb catalysts in polyethene production and hydrogen peroxide production. This desiccant also acts as a selective adsorbent to remove arsenic, fluoride, and sulfur from gas streams (Claus Catalyst process). Activated Alumina is mainly used to remove fluoride from drinking water, efficiently ...

Sorbster ® Se-1 is a highly functionized, enriched, alumina media that covalently bonds soluble selenium and other trace contaminants to its active sites. It is suitable for use across a broad range of water qualities. The MCLG for selenium is 0.05 mg/L, or 50 ppb Sorbster ® Se-1 is specifically designed to remove multiple species: Oxyanions – selenite (SeO₃) & selenate (SeO₄)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 activated carbon (GAC) to remove inorganic and organic selenium species from contaminated water.The efficacy of the modified co-precipitation method using a combination of ferrous and ferric …

Sorbster ® Media Protects the Aqueous Environment, Eliminating the Hassle, and Lowering the Cost of Wastewater Solutions. Sorbster ® Media Wastewater Treatment Process is a functionalized, enriched alumina media that covalently bonds soluble metals and other trace contaminants to its active sites. Sorbster ® Media is used to remove contaminants in …Selenium removal by activated alumina (AA) in batch and continuous-flow reactors was investigated in this study. The adsorption kinetics fitted pseudo-first as well as pseudo-second order models with equilibrium time for Se(VI) and Se(IV) adsorption of 8 and 12 hr, respectively. A significant higher adsorption capacity for Se(IV) than Se(VI ...

Activated alumina is a stable compound that is used in various applications as adsorbents to remove toxic contaminants in water, desiccant to keep things dry and reduce humidity level, and catalysts for the oil and gas …Separation by filtration through 0.45 μm filters resulted in 87±1% Se (0) removal. Ferric chloride and aluminum sulfate were used as coagulants in coagulation-flocculation experiments. Aluminum sulfate achieved the highest turbidity removal (92±2%) at a dose of 10 (-3) M, whereas ferric chloride achieved a maximum turbidity removal ...

The performance of selenium remediation agents, mainly gamma alumina sorbents and zerovalent metals is greatly inhibited in the presence of large concentrations of sulfate found in selenium-rich agricultural drainage water. It is therefore imperative to remove sulfates from these contaminated waters, prior to their treatment for selenium removal.(ORP) range for selenium reduction. Coagulation, flocculation and plate settler sedimentation – This process utilizes the addition of aluminum chlorohydrate (ACH) along with a static mixer, conventional flocculation and plate settlers to remove solids and organics that carry over from the ABMet process and the recycle clarifiers.

Adsorption of selenite (SeO) and selenate (SeO) on hydrous alumina (γ-Al 2 O 3) was studied using batch equilibrium experiments. pH, the single most significant parameter, affected both speciations of selenium (Se) and of surface hydroxo groups on alumina that, in turn, determined the extent of adsorption of the oxyanions.Adsorption of both anions could be described …These coagulants were used to remove Selenium (IV) and Selenium (VI) from drinking water[15]. This work aims to the purification of groundwater contaminated by Selenium by a cactus-based coagulant, aluminum sulfate, and ferric chloride. The study concerned five parameters: pH, permanganate index, Selenium removal, and settled and colloidal ...

A selenium removal efficiency of 92% was achieved in a bioreactor with initial biomass of 2.2 × 10 6 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 ...The removal of selenium from water by other metallic compounds, specifically oxides and hydroxides, has been reported. Activated alumina adsorption is known to be an effective and inexpensive ...

The present study reports detailed evaluation of mesoporous activated alumina (MAA) for simultaneous removal of two hazardous inorganic species of selenium, namely selenite and selanate, from drinking water. MAA was used after washing with deionized water followed by drying at 110 °C for 8 h. The material was characterized using pXRD, FTIR, zeta …A process for removing selenium and/or arsenic from aqueous streams including industrial process waters and drinking water is provided comprising contacting the stream with a composition comprising lanthanum oxide whereby selenium and/or arsenic are adsorbed. Preferred compositions comprise lanthanum oxide and alumina.

The performance of selenium remediation agents, mainly γ alumina sorbents and zerovalent metals is greatly inhibited in the presence of large concentrations of sulfate found in selenium-rich agricultural drainage water. It is therefore imperative to remove sulfates from these contaminated waters, prior to their treatment for selenium removal.SELENIUM REMOVAL WITH ACTIVATED ALUMINA Web Site Fax (562) 693-5257 e-mail [email protected] 6739 S. Washington Ave., Whittier, CA 90601 (800) 926 …

The Pureflow System for the removal of selenium from drinking water supplies is an improved design for the water treatment industry. A highly adsorptive activated alumina media and chemical treatment system …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.

Yuan (1984) demonstrated that both Se (IV) and Se (VI) can be removed effectively by activated alumina and that the adsorption process is highly dependent on pH. The adsorption of selenium (VI) continuously …effectively recover a high percentage of Se(IV) removed during a previous treatment run. The following regeneration steps are recommended for Se(IV) removal: 1.5 lb/ft3 of 0.5% NaOH at …

Aqueous fluid polluted with selenium contaminants is mixed with or passed through an adsorbent material selected from: (i) nanoparticles or colloids of oxides or hydroxides of transition metals or of aluminum, or mixtures thereof, or (ii) porous carbon, activated carbon, aluminum oxide or hydroxide, activated alumina, mineral clay, zeolite, or mixtures thereof in granular, particles or …The Pureflow System for the removal of selenium from drinking water supplies is an improved design for the water treatment industry. A highly adsorptive activated alumina media and chemical treatment system combine …