Removal selenium effluents

MJ Series Jaw Crusher

MJ Series Jaw Crusher

MJ series jaw crusher is mainly used as a coarse crushing crusher. Its purpose is to crush rocks into smaller particle sizes for subsequent processing…

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MC Series Single-Cylinder Hydraulic Cone Crusher

MC Series Single-Cylinder Hydraulic Cone Crusher

MC series single cylinder hydraulic cone crusher is used in secondary and fine crushing operations. It is widely used in metallurgy, construction, highway,…

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ML Series Vertical Shaft Impact Crusher

ML Series Vertical Shaft Impact Crusher

Vertical shaft impact crusher is often used in the final crushing circuit. Due to the ability to produce fine-grained final products, ML series vertical…

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MD Series Multi-Cylinder Hydraulic Cone Crusher

MD Series Multi-Cylinder Hydraulic Cone Crusher

MD series multi-cylinder hydraulic cone crusher is used in the second and third stages of mineral processing and stone crushing, as well as the superfine…

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MF Series Fixed Shaft Circular Vibrating Screen

MF Series Fixed Shaft Circular Vibrating Screen

In order to eliminate the phenomenon of unbalanced vibration, unstable amplitude, on/off bounce, poor screening effect, and cracking of the screen box…

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MGD Series Vibrating Feeder

MGD Series Vibrating Feeder

MGD series vibrating feeder is designed for ultra-heavy working conditions and is suitable for feeding materials to primary jaw crushers, primary impact…

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MGB series hopper discharge feeder

MGB series hopper discharge feeder

MGB series hopper discharge feeder is mainly used for the uniform, quantitative and automatic control of under-silo feeding of bulk materials.…

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MZA/K Series Circular Vibrating Screen

MZA/K Series Circular Vibrating Screen

MZA/K series circular vibrating screen produced by Meilan has an axis-eccentric circular vibrating screen, which can be used for dry and wet classification…

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  • OBORTS Company, Opposite the residence of old General Mambou, Near Dragage, Bastos, Yaoundé, Cameroon
    Email: [email protected]

  • Attachment A: Technology-based Effluents Limits Flue Gas

    pollutants such as selenium, boron, and magnesium, are present mostly in soluble form and are not effectively and reliably removed by wastewater settling ponds. For metals present in both soluble and particulate forms (such as mercury), the settling pond will not effectively remove the dissolved fraction.

  • Removal of phosphorus/selenium from aqueous solutions by

    cost-effective treatment approach to phosphorus removal from municipal secondary effluents. (2) Synthesized nano-magnetite was used as an adsorbent to develop an innovative technology for selenium removal from aqueous solutions. Each case involved a series of batch adsorption experiments conducted to evaluate adsorption kinetics,

  • ) 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.

  • Start-Up of a Passive Remediation Bioreactor for Sulfate

    1 Start-Up of a Passive Remediation Bioreactor for Sulfate and Selenium Removal from Mine Tailings Water Susan Baldwin1, Parissa Mirjafari1, Maryam Rezahdebashi1, Gaurav Subedi1, Jon Taylor1, Luke Moger2, Katie McMahen2 and Art Frye2 1. Chemical and Biological Engineering, University of British Columbia, Canada

  • 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.

  • Selenium Removal by Constructed Wetlands: Role of

    Jan 22, 1998· 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 36-ha constructed wetland located adjacent to San Francisco Bay. The

  • 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 …

  • 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: – Prevention – Source

  • Removal of Selenium from Industrial Effluent Streams

    Amongst the first group it is easy to find processes based on the reduction of selenium ions using reagents such as zero-valent iron (6, 7) or sodium sulfide (8). Although relatively cost-effective techniques, they are extremely dependent on pH and temperature conditions and require vast quantities of non-reusable reactants.

  • Electro-Biochemical Reactor (EBR) Technology for Selenium

    concentrations in EBR effluents ranged from 0.5 µg/L to 1.4 µg/L, while reducing sulfate concentrations. The test data demonstrate that the EBR technology is an effective Se removal option for British Columbia’s coal-mining wastewaters. Introduction Selenium in Mining Selenium (Se) is …

  • (PDF) Treatment of Selenium in Simulated Refinery Effluent

    Water Air Soil Pollut (2011) 221:301–312 DOI 10.1007/s11270-011-0791-z Treatment of Selenium in Simulated Refinery Effluent Using a Pilot-Scale Constructed Wetland Treatment System Michael M. Spacil & John H. Rodgers Jr. & James W. Castle & Cynthia L. Murray Gulde & James E. Myers Received: 29 November 2010 / Accepted: 7 March 2011 / Published online: 2 April 2011 # Springer …

  • US5494582A - Removal of selenium from water by ion

    Selenium compounds present in aqueous liquids containing sulfate and or chloride anions can be effectively removed by passing the liquid through a thiouronium modified anion ion exchange resin.

  • 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

  • TECHNOLOGIES AND POTENTIAL TECHNOLOGIES FOR …

    selenium removal. Selenium removal is accomplished by using a strong base anion ion exchange resin. Selenium (VI) is extracted much more effectively than Se(IV). The extraction of Se(VI) is decreased by sulfate. Tailored resins show good selectivity for selenium in the presence of sulfate but only laboratory studies have been performed.

  • Selenium removal from mining and process wastewater: a

    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.

  • "Removal of phosphorus/selenium from aqueous solutions by

    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 effluents. (2) Synthesized nano-magnetite was used as an adsorbent to develop an innovative technology for selenium removal from aqueous solutions.

  • Desulfurization: Critical step towards enhanced selenium

    Apr 01, 2017· 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.

  • SBIR Phase I: Enhanced Biocatalytic Selenium Removal from

    While existing regulations limit selenium concentrations in water to 50 parts-per-billion, industrial effluents (e.g. flue gas desulfurization, mining wastewater, coal power plants) are often required to achieve levels below 10 parts-per-billion.

  • Biological Selenium Removal: Solution To Pollution

    Sep 16, 2008· Feb. 7, 2017 — High levels of selenium have been found in the tissues of fish in North Carolina lakes that receive coal ash effluents from power plants. Concentrations of selenium …

  • Heavy Metals Removal Effluent Water Treatment SUEZ

    Remove heavy metals from wastewater over a wide pH range Use chemical solutions for soluble and/or particulate heavy metals, such as lead, copper, chromium, iron, manganese, mercury, nickel and zinc Remove selenium with advanced biological treatment

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

    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.

  • Removal of Selenium from Wastewater using ZVI and …

    REMOVAL OF SELENIUM FROM WASTEWATER USING ZVI AND HYBRID ZVI/IRON OXIDE PROCESS . A Thesis . by . ZHEN YANG . Submitted to the Office of Graduate Studies of . Texas A&M University . in partial fulfillment of the requirements for the degree of . MASTER OF SCIENCE . Approved by: Chair of Committee, Yongheng Huang. Committee Members, Binayak

  • Removal of selenium from aqueous media - Shell Oil Company

    Oct 08, 1992· The present invention relates to a process for the removal of selenium from aqueous media. 2. Description of the Prior Art . Selenium is a naturally occurring group VIA element found in rocks and soil with the average concentration in the earth's crust being about 0.7 ppm.

  • US20160289092A1 - Removal of dissolved selenium from

    Processes for treating aqueous solutions to remove dissolved selenium species, for example in the presence of an excess of sulphate anions, which include the use of strongly basic anion exchange resins, or co-precipitation and adsorption of the selenate (and selenite) with mixed ferrous and ferric iron, or combinations thereof. Co-precipitation and adsorption of selenate may take place in an

  • Selenium Removal Using a Moving Bed Biofilm Reactor - NC

    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.

  • Moving Bed Biofilm Reactor for Selenium Reduction in mine

    Jan 15, 2016· Selenium, present in mine effluents as selenate and selenite, has recently become a concern. Selenium is highly toxic to aquatic life and the discharge limitations for total selenium are becoming increasingly stringent. Some discharge criteria for release of mine effluent into fresh water systems have been set to < 4.7 µg/l Total Se.

  • Selenium Removal - WordPress

    Jan 15, 2016· Biological treatment of mine effluents with MBBR technology is a viable solution to meet stringent discharge limits In combination with SeleniumZero®, complete selenium removal can be achieved, even at very low temperature 24 Conclusions

  • The Effect of Gypsum on the Fixation of Selenium in the

    The coprecipitation of selenium (IV) (Se) with iron (III) (Fe) is a widely practiced method for the removal of Se from mineral processing effluents, but the effect of gypsum as a major secondary mineral on the iron-selenium coprecipitation process is still of concern. In our work we first investigated the effects of pH, Fe/Se molar ratio and the neutralizing agent on the removal efficiency of

  • Industrial wastewater treatment - Wikipedia

    Industrial wastewater treatment describes the processes used for treating wastewater that is produced by industries as an undesirable by-product. After treatment, the treated industrial wastewater (or effluent) may be reused or released to a sanitary sewer or to a surface water in the environment.. Most industries produce some wastewater.Recent trends have been to minimize such production or

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

    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. Laboratory experiments are presented for the removal by coprecipitation and the results are discussed.

  • Removal of selenium from water and wastewater

    Feb 24, 2007· 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

  • Selenium Removal by Constructed Wetlands: Role of

    Selenium Removal by Constructed Wetlands: Role of Biological Volatilization DREW HANSEN, PETER J. DUDA,† ADEL ZAYED,‡ AND NORMAN TERRY* Department of Plant and Microbial Biology, University of California, Berkeley, California 94720-3102 Selenium-laden effluents from oil refineries are polluting San Francisco Bay, California. One environmentally