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US Patent for Method of selenium removal Patent (Patent ...

Feb 11, 2000· Referring to FIG. 6, a comparison of selenium removal by different microbes, nutrients, and aeration levels in mine water containing 0.62 mg/L selenium at pH 7.96 is presented. Tests used …

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Desulfurization: Critical step towards enhanced selenium ...

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 ...

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Selenium Removal by Constructed Wetlands: Role of ...

Selenium-laden effluents from oil refineries are polluting San Francisco Bay, California. One environmentally friendly way of cleaning up selenium (Se) from effluents is by plant and microbial Se …

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Removal of Selenium from Industrial Effluent Streams

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 l–1 of sulfur in the form of sulfate (5). ... special attention is paid to the removal of selenium ions

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Chapter 8. Treatment of drainage effluent

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 …

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Mining-Related Selenium Contamination in Alaska, and the ...

Selenium pollution has been a topic of extensive research dating back further than the last decade and has attracted significant attention from several environmental and regulatory agencies in order to monitor and control its discharge from myriad industrial sources. The mining industry is a prime contributor of hazardous selenium release in the aquatic systems and is responsible for both ...

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A New Process For Sulfate Removal From Industrial Waters

The CESR process is a cost-effective alternative for sulfate removal. Summary. In the Cost-Effective Sulfate Removal (CESR) process used by Hydrometrics, a proprietary reagent is added after standard lime treatment to precipitate a compound called ettringite, which …

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Removal of selenium from water and wastewater ...

Feb 24, 2007· Selenium concentration in industrial effluents may vary from 1 to 7000 μg/L. This paper reviews various treatment technologies for the removal of selenium from water and wastewater such as sedimentation, filtration, activated carbon adsorption, ion exchange, reverse osmosis and …

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Mo, Sb and Se Removal from Scrubber Effluent of a Waste ...

Common physicochemical treatment of industrial wastewater is not very efficient regarding the removal of the oxyanion forming elements selenium, molybdenum and antimony. An industrial case is described where effluents …

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Process for removal of selenium and arsenic from aqueous ...

Process for removal of selenium and arsenic from aqueous streams May 26, 1995 - Board of Regents of the University and Community College Systems of Nevada A process for removing selenium …

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Removal of phosphorus/selenium from aqueous solutions …

Removal of Phosphorus/Selenium from Aqueous Solutions by . Adsorption Processes . Shilpa Bhojappa . The present study includes two parts : (1) Acid mine drainage (AMD) sludge, a waste product from coal mine water treatment, was used as an adsorbent to develop a cost-effective treatment approach to phosphorus removal from municipal secondary ...

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Review of Available Technologies for the Removal of ...

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…

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Anoxic biotreatment cell (ABC) for removal of nitrate and ...

@article{osti_20026841, title = {Anoxic biotreatment cell (ABC) for removal of nitrate and selenium from mining effluent waters}, author = {Reinsel, M A and Botz, M K}, abstractNote = {Removal of nitrate from mining and other industrial and municipal effluents is often required to meet water discharge limits, and state and federal nondegradation standards for surface water and groundwater.

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Industrial Selenium Pollution: Wastewaters and Physical ...

Industrial Selenium Pollution: ... however, the competition with other anions present in real industrial effluents severely limits the Se removal performance. Chemical treatment has been tested for selenium removal…

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Biological removal of selenate and ammonium by activated ...

1. Introduction. Many wastewaters such as mining effluents (acid mine drainage, coal mine wastewaters, uranium mine discharge and gold mine wastewaters), agricultural drainage and industrial effluents are contaminated by both selenium oxyanions and ammonium, and thus need to be treated before discharging into natural water bodies (Dale et al., 2015, Kapoor et al., 2003, Tan et al., 2016 ...

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A Critical Review of Removal of Zinc from Wastewater

Zinc metal is included in most single tablet, it is believed to possess anti-oxidant properties, which protect against premature aging of the skin and muscles of the body. Zinc is the 23rd most abundant element in the Earth's crust and its concentrations are rising unnaturally, due to addition of zinc …

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Selenium Removal from Refinery Effluent - JSE Consulting

Novel Approach for Removing Selenium from Phillips 66 Ponca City, OK Refinery Effluent AFPM, Oct 19, 2015 3 Fe(OH)3, while selenate is difficult to remove with …

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Selenium removal method - Chevron U.S.A. Inc.

Oct 16, 2007· 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 …

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Removal of Selenium from Wastewater using ZVI and …

Selenium is widely distributed in soils and natural waters resources through variety of species that are linked by many biogeochemical transformation reactions (Chapman et al., 2010). Different species of selenium have been found including inorganic selenium, volatile and methylated selenium, protein and amino acid selenium

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Use of a rotating biological contactor for removal of ...

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 …

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Desulfurization: Critical step towards enhanced selenium ...

Desulfurization: Critical step towards enhanced selenium removal from industrial effluents Article (PDF Available) in Chemosphere 172:111-117 · April 2017 with 444 Reads How we measure 'reads'

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PROJECT SUMMARY/ABSTRACT - CEProfs

Novel Adsorbent-Reactants for Treatment of Ash and Scrubber Pond Effluents. The overall goal of this project is to evaluate the ability of novel adsorbent/reactants to remove arsenic, selenium and mercury from ash and scrubber pond effluents while producing stable residuals for ultimate disposal.

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Wastewater treatment using MBBR in cold climates

term nitrogen removal can be sustained down to 4°C and selenium removal can be sustained down to 7°C. Results from 2 separate studies treating mine effluents are presented. The first case study …

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Desulfurization: Critical step towards enhanced selenium ...

Desulfurization: Critical step towards enhanced selenium removal from industrial effluents. Staicu LC(1), Morin-Crini N(2), Crini G(2). Author information: (1)Université de Bourgogne Franche-Comté, UFR Sciences & Techniques, UMR Chrono-environnement, 6249, Besançon, France; University Politehnica of Bucharest, Faculty of Applied Chemistry ...

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Advancement in Non-Biological Selenium Removal …

material will passivate through generation of iron oxide surface layers, reducing the selenium removal efficiency. In addition, the kinetics of selenate removal using iron-based sorbents is slow. Generally, sorbent materials have to be in contact with selenium containing water for a long time (2-12 hours) in order to remove selenium effectively.

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(PDF) Mo, Sb and Se Removal from Scrubber Effluent of a ...

The effluent of the settling tank still contains variable concentrations of selenium, molybdenum and antimony and the overall removal efficiency is not reproducible for these elements.

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Moving Bed Biofilm Reactor for Selenium Reduction in …

Jan 15, 2016· Moving Bed Biofilm Reactor for Selenium Reduction in mine effluents C. Dale Veolia Water Solutions and Technologies, 4001 Weston Parkway, Cary, NC, [email protected] Abstract Selenium, present in mine effluents as selenate and selenite, has recently become a concern.

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) technology demonstrates low selenium effluents in ...

removal of residual mill organics; O A two-stage EBR system each with a 6 -hour HRT to remove the total selenium and other metals; O An anaerobic post-treatment system with a 6-hour HRT to polish the EBR system effluents and remove the residual nutrients prior to discharge; and O A 24-hour holding pond prior to discharge – site specified.

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A Nanoselenium Sponge for Instantaneous Mercury Removal …

Selective removal of aqueous mercury to levels below 10 ng L −1 or part per trillion remains an elusive goal for public health and environmental agencies. Here, it is shown that a low-cost nanocomposite sponge prepared by growing selenium (Se) nanomaterials on the surface and throughout the bulk of a polyurethane sponge exhibits a record breaking-mercury ion (Hg 2+) removal rate, regardless ...

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Selenium Oxidation and Removal By Ion Exchange

Column effluents were collected, preserved with 5 mL concentrated nitric acid per 100 mL of sample, and analyzed for selenium by GFAAS. A Perkin Elmer model 5000 atomic ab- sorption spectrophotometer equipped with a graphite furnace, a model 400 graphite furnace programmer, and Zeeman background correction was used for all selenium …

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Method of selenium removal - Weber State University

Feb 06, 2001· Referring to FIG. 6, a comparison of selenium removal by different microbes, nutrients, and aeration levels in mine water containing 0.62 mg/L selenium at pH 7.96 is presented. Tests used 250 ml Erlenmeyer flasks containing 50 ml of filter sterilized wastewater and a 10-fold dilution of log phase microbial cells (2.0×10 8 cells/ml) as an inoculum.

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Field Evaluation of Arsenic and Selnium Removal by Iron ...

Selenium removal. Figure 5 shows percentage of total selenium removed as a function of clarifier overflow rate and iron dose. Selenium removal generally increased with increasing iron dose and decreasing overflow rate. Figure 6 shows how effluent dissolved selenium and effluent total selenium …

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Selenium Removal Using a Moving Bed Biofilm Reactor

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