removal selenium effluents

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

18 · total cyanide removal, removal of weak and dissociable cyanides, 99% ammonia removal. The daily operational costs were $0.10 (€0.09) per m3 in 1990 (Whitlock, 1990). 3.3. Removal of selenium (Se) from smelter effluents Selenium is often present in effluents from zinc hydrometallurgy circuits. Various

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INDUSTRIAL WASTEWATER-TYPES, AMOUNTS AND …

23 · effluents contain chloride organics and dioxins, as well as suspended solids and organic wastes. The petrochemical industry discharges a lot of phenols and mineral oils. ... for the retention and removal of mineral oils. Residues of emulsified oil remaining in the water also need chemical flocculation. In many cases, wastewater is produced in ...

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Selenium removal method

16 · 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.

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Desulfurization: Critical step towards enhanced …

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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APPENDIX V LABORATORY INVESTIGATION OF …

2 · Laboratory Investigation of Hexavalent Selenium Removal from Kerr Waste Rock Leachate Water USING BIOTEQ’S SELEN-IX PROCESS AND BIOLOGICAL REDUCTION OF SELENIUM Janu ... The Selen-IX process was optimized so effluents with Se(VI) concentrations less than 1 ppb were achieved.

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Selenium Removal by Constructed Wetlands: Role of ...

2 · 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 volatilization using constructed wetlands. Using mesocosms, we investigated the role of biological Se volatilization in a ha constructed wetland located adjacent to San Francisco Bay.

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Jorge V.F.L. Cavalcanti , César A.M. Abreu

25 · Removal of Effluent from Petrochemical Wastewater by Adsorption Using Organoclay 279 effluents from refineries is toxic, causing in these organisms not only lethal effects as well as changes to their growth and reproduction (Wake, 2004). Many hydrocarbons, particularly the aromatics, have certain solubility in water, such as

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) technology demonstrates low selenium effluents in ...

20 · 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 hour HRT to polish the EBR system effluents and remove the residual nutrients prior to discharge; and O A hour holding pond prior to discharge – site specified.

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(PDF) REMOVAL OF SELENIUM FROM SMITH RANCH …

PDF | Bench-scale experiments were carried out to investigate a number of potential methods of selenium removal from purge water obtained from Cameco Resources Smith …

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Selenium Removal by Constructed Wetlands: Role of ...

2 · 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 volatilization using constructed wetlands. Using mesocosms, we investigated the role of biological Se volatilization in a ha constructed wetland located adjacent to San Francisco Bay.

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Selenium removal method

14 · 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.

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Biological Removal of Selenium from Mining Influenced ...

8 · selenium removal reviewed in (CH2M Hill, 2010). The removal of dissolved selenium compounds from MIW is particularly challenging when: 1) dissolved selenium occurs at relatively dilute concentrations (for example, less than 1 mg/L) and must be removed to much lower concentrations (≈1 µg/L in Canada, for instance) (Canadian

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Chapter 8. Treatment of drainage effluent

30 · The target residence time for the flowing waters was 7 days for Cells 7, 21 days in Cells 8 and 9, and 14 days in Cell 10. These residence times were selected after preliminary runs for optimal removal. A residence time of three days was too short for selenium removal and a residence time of more than 21 days did not increase selenium removal.

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Solar photocatalytic removal of selenite, selenate and ...

The experimental results indicated pH 4 to be the optimum for highest selenium removal. Furthermore, solar energized photocatalytic removal of selenite, selenate and selenocyanate increased with an increase in both initial selenium and initial EDTA concentrations.

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Methods of Removing Heavy Metals from Industrial …

14 · Methods of Removing Heavy Metals from Industrial Wastewater Gunatilake S.K. ... the removal of heavy metals from industrial wastewater. Physico-chemical removal processes ... Arsenic, Selenium, Molybdenum, Cobalt, Manganese, and Aluminum. They represent serious threats to the human population and the fauna and flora of the receiving

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Flue gas desulfurization effluents: An unexploited ...

Depending on the SO 2 concentrations and the excess air in the flue gas, as well as on the pH of limestone slurry, some systems may be operated in the natural oxidation mode. However, for most applications it is beneficial to control oxidation .In natural oxidation mode, the main product is a mixture 50–60% of CaSO 3.½ H 2 O and CaSO 4.2H 2 O in a sludge form which is difficult to dewater ...

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Literature Review of Environmental Toxicity of Mercury ...

17 · Literature Review of Environmental Toxicity of Mercury, Cadmium, Selenium and Antimony in Metal Mining Effluents Beak International Incorporated Ref: 22069.1 ii DISCLAIMER The primary purpose in producing this report is to provide a review of mercury, cadmium, selenium and antimony as it relates to metal mining effluents.

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Anoxic biotreatment cell (ABC) for removal of nitrate …

17 · @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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Advancement in Non-Biological Selenium Removal …

contains selenium and other constituents captured by the scrubber. In the oil and gas sector, selenium can be present with sulphur in sour gas. In such a case, the sweetening of gas leads to the co-removal of selenium and sulphur, ultimately generating selenium bearing waste water for discharge.

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Removal of selenium from water and wastewater

16 · feasibility for the removal of arsenic and selenium from ash pond effluents containing 40 to 60 ug/L selenium by coprecipitation with amorphous iron oxyhydroxide.13 The pilot plant included rapid mix, flocculation and sedimentation. Selenium removals ranged from 56 to 80% for iron dosages of 14 mg/L and above. The optimum removal was

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US Patent for Process for removal of selenium and …

The combination of oxides is a low-cost catalyst for selenium removal as compared to lanthanum oxide alone. Example 4. Removal of Selenium with Mixed Oxide (90% alumina and 10 percent La.sub.2 O.sub.3. Lanthanum oxide mixed with gamma-alumina showed similar results to …

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Removal of selenium from water and wastewater ...

16 · 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 μg/L. This paper reviews various treatment technologies for the removal of selenium from water and wastewater such as sedimentation ...

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Industrial Selenium Pollution: Wastewaters and …

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, being mainly founded on the redox change of this element. Various reducing agents (e.g., zero-valent iron and sodium dithionite ...

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US5603838A

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.

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Removal of Selenium from Industrial Effluent Streams

28 · 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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US5603838A

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.

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Measurement and removal of bioconcentratable …

14 · @article{osti_49580, title = {Measurement and removal of bioconcentratable compounds in refinery effluents}, author = {Gala, W.R. and Dorn, P.B. and Means, J.C. and Jenkins, K.D. and Folwarkow, S.}, abstractNote = {Public concern regarding the presence of persistent, bioconcentratable compounds in fish and shellfish has led the petroleum ...

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Rhizosphere-induced Selenium Precipitation for Possible ...

28 · Rhizosphere-induced Selenium Precipitation for Possible Applications in Phytoremediation of Se Polluted Effluents Giovanni Vallini*, Simona Di Gregorio, and Silvia Lampis University of Verona, Department of Science and Technology, Laboratories of Microbial

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Removal of Selenium from Wastewater using ZVI and …

16 · deleterious substances through various effluents after being processed. Permits are negotiated by stakeholder, government and contain specific limits on toxic chemical pollutants, and directions on monitoring and compliance requirements. These permits require stakeholders to monitor levels of selenium in water, possibly comply with the

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New Smopex® Ion Exchange Materials for the Removal of ...

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 ...

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