selenium removal bacterial

Laboratory-scale continuous reactor for soluble selenium removal using selenate-reducing bacterium ... L/cells/h, respectively. The yield of the bacterial cells by selenate reduction was estimated to ... Michihiko Ike, Laboratory-scale bioreactors for soluble selenium removal from selenium refinery wastewater using anaerobic sludge ...

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Selenium species, particularly the oxyanions selenite (SeO3 2−) and selenate (SeO4 2−), are significant pollutants in the environment that leach from rocks and are released by anthropogenic activities. Selenium is also an essential micronutrient for organisms across the tree of life, including microorganisms and human beings, particularly because of its presence in the 21st genetically ...

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Apr 15, 2019· These newly isolated strains are potential candidates for application in selenium removal and recovery from wastewater contaminated with selenium. Bacterial strains would be selected depending on the characteristics of the wastewater. In the case that complex organic carbon sources such as glucose are available in the wastewater, strain NVK-2A ...

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Cost and efficiency are the two important factors considered in the remediation of Se-contaminated agricultural drainage water through bacterial reduction of soluble Se(VI) to insoluble Se(0). We propose to use redox mediators and zero-valent iron to accelerate Se removal in a biotreatment system in which Se(VI)-reducing bacteria will use inexpensive organic carbon to reduce Se(VI) to Se(0) in ...

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Tan, Lea Chua, Erika J. Espinosa‐Ortiz, Yarlagadda V. Nancharaiah, Eric D. van Hullebusch, Robin Gerlach, and Piet N. L. Lens, "Selenate removal in biofilm systems: effect of nitrate and sulfate on selenium removal efficiency, biofilm structure and microbial community," Journal of Chemical Technology & Biotechnology, January 2018. doi:10.1002/jctb.5586

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Selenium Removal from Scrubber Water VSEP RO membrane treatment for water reuse Flue Gas Scrubber When coal is burned to make energy, a flue gas is produced that must be exhausted. This flue gas contains Sulfur Dioxide. Previously, the combustion gases that …

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Indian mustard (Brassica juncea L.) accumulates high tissue Se concentrations and volatilizes Se in relatively nontoxic forms, such as dimethylselenide. This study showed that the presence of bacteria in the rhizosphere of Indian mustard was necessary to achieve the best rates of plant Se accumulation and volatilization of selenate. Experiments with the antibiotic ampicillin showed that ...

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A process for removing selenium and nitrate from agricultural drainage water using algae and anaerobic bacteria was studied in a field system. Algae were grown in high-rate ponds containing drainage water, and the 178-± 99-mg/L culture took up 18 ± 13 mg/L NO3- – N.

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Jul 30, 2019· Furthermore, microbial community analysis suggested that various Se-reducing bacteria coordinately contributed to the removal of Se in the SBR and main contributors varied depending on the operational conditions. This study will offer implications for practical biological treatment of selenium in saline wastewater.

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With the aim of developing a biological process for selenium removal, the effects of a variety of parameters on the reduction of soluble selenium by a Bacillus sp. strain SF-1, which is capable of ...

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experiments. It seems that the removal of selenium in dissolved phase occurred more rapidly after the second addition of selenate in the aerobic slurry (Fig. 1). This is also probably the case under anaerobic conditions; however, the measurements were not frequent enough. DGGE analysis Bacterial community structure in samples T0 (initial

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A technology known as Algal-Bacterial Selenium Removal (ABSR) may solve the problem of removing selenium, a toxic metalloid, from agricultural drainage water. However, to remove selenium, nitrogen ...

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Jan 15, 2016· CH2M has written a comprehensive review article on selenium removal technologies for the North American Metals Council. This 233-page report includes specific approaches to selenium management for mining, agriculture, power generation, and oil and gas. For more information on selenium removal in general, contact Mark Reinsel at

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The level of selenium-resistant bacteria in water, algal mats, and sediment from Kesterson reservoir, Calif., a site with known selenium pollution, was compared with that in nearby Volta reservoir, a site with low selenium levels. A high percentage (>50%) of all isolates from the Kesterson samples ...

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The aim of this work was to evaluate the applicability of lactic acid bacteria as tools for heavy metal removal from water and characterize their properties for further ... selenium, lead, nitrate and nitrite. However, there are a number of other known contaminants causing problems on a smaller scale, and the WHO (2006) has listed over 160

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The bacteria form a fixed biofilm throughout the GAC substrate material, forming a cooperative microbial community. In addition to increasing the efficiency of selenium removal, this communal structure also serves as a shelter, protecting the bacteria from chemical and physical upsets.

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Advancement in Non-Biological Selenium Removal Treatment Systems – Results of Continuous Pilot Scale Operations ... the co-removal of selenium and sulphur, ultimately generating selenium bearing waste water for ... bacterial action, biological water treatment …

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Algal-bacterial treatment facility removes selenium from drainage water Nigel W.T.Quinn a Tryg J. Lundquist a F. Bailey Green a Max A. Zdrate a William J. Oswald Terrance Leighton A demonstration algal-bacterial selenium removal (ABSR) facility has been treating agricultural

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Bioreactors designed for nitrate and selenium removal will also support sulfate-reducing bacteria. These biological treatment systems require a supplemental carbon source that serves as an electron donor for these microbiological processes. How EOSi can help. MicroC® supplemental carbon sources provide a consistent, readily-available source of ...

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A model continuous flow bioreactor (volume 0.5 L) was constructed for removing toxic soluble selenium (selenate/selenite) of high concentrations using a selenate‐reducing bacterium, Bacillus sp. SF‐1, which transforms selenate into elemental selenium via selenite for anaerobic respiration. Model wastewater contained 41.8 mg‐Se/L selenate and excess lactate as the carbon and energy source ...

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Jan 28, 2015· In nature, selenium is actively cycled between oxic and anoxic habitats, and this cycle plays an important role in carbon and nitrogen mineralization through bacterial anaerobic respiration. Selenium-respiring bacteria (SeRB) are found in geographically diverse, pristine or …

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Nov 04, 2004· Algal-Bacterial Selenium Removal PROS Pilot scale facilities in Mendota reduced Selenium concentrations by more than one order of magnitude, and another pilot study in the Panoche WD achieved Selenium removal rates of 40-80% Bench-scale and pilot studies of controlled eutrophication process at Salton Sea use algal flocculation to remove Selenium

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A demonstration algal-bacterial selenium removal (ABSR) facility has been treating agricultural drainage water in the Panoche Drainage District on the west side of the San Joaquin Valley since 1997.

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selenium removal, this communal structure also serves as a shelter, protecting the bacteria from chemical and physical upsets. These bacteria are facultative anaerobes, which flourish in oxygenated environments; however, when oxygen is depleted the bacteria utililize other compounds for respiration, resulting in the dissimilatory reduction of other

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dissolved selenium more e˚ ectively in the presence of nitrate but only once all nitrate was removed. When inoculated into actual mine water, the enriched tailings pond bac-teria removed 40% selenium, whereas natural marsh enrichment bacteria achieved less selenium removal (10%). Keywords: coalmining, selenium, nitrate, biological treatment

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The U.S. Bureau of Mines is conducting laboratory research on bacterial removal of selenium from wastewaters. A mixed bacterial culture has been removing up to 96 pct of the selenium from agricultural drainage waters in a small-scale, continuous, plug-flow reactor for 1 yr; selenium removal is correlated to changes in the bacterial cultures.

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Selenium is a metal found in natural deposits as ores containing other elements. The greatest use of selenium compounds is in electronic and photocopier components, but they are also widely used in glass, pigments, rubber, metal alloys, textiles, petroleum, medical …

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The understanding of mechanisms selenate treatment was 72% after 120 days. Population underlying bacterial assimilation and removal of selenium survival of isolates showed stability at lower treatments prerequisites the information on phenotypic and phyloge- and decline at higher levels of Se enrichment.

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elemental selenium in the presence of an appropriate carbon source and in the absence of oxygen. Since these previous studies, an Algal-Bacterial Selenium Removal System (ABSR) has been developed by Dr. William Oswald along with an environmental engineering group at UC Berkeley to utilize this phenomenon.

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Selenium Removal from Refinery Wastewater Using Immobilized Cell Bioreactor Technology Refinery Case Study Conclusions • Consistent removal of selenium levels below 50 µg/l demonstrated in the pilot demonstration to meet discharge requirements – Stable effluent quality independent of influent variations

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