Navigation Links
Biological selenium removal: The solution to pollution?
Date:9/15/2008

MADISON, WI, AUGUST 25, 2008 Selenium has been referred to as an "essential toxin" due to the fact that it shows only a marginal line between the nutritious requirement and toxic effects upon exposure. The steep dose response curve due to bioaccumulation effects have lead to the characterization of selenium as a "time bomb" that can be fused by exceeding a narrow threshold concentration in ecosystems through anthropogenic activities. Ironically, an estimated 0.5 to 1 billion people worldwide suffer from selenium deficiency, whereas areas of toxicity can be separated from selenium deficient areas by only 20 km.

The microbiological treatment of selenium - so called "dissimilatory metal reduction" - could supersede this problem, as selenium-reducing microorganisms are highly selective for selenate, reducing it to insoluble, less-toxic elemental selenium that can potentially be recovered from the process.

A study funded by the European Union, published in the September-October issue of the Journal of Environmental Quality, demonstrates that the biological treatment is indeed efficient for selenate reduction, and substantial amounts of selenate are converted to methylated selenium species or nano-sized elemental selenium particles. The emission of nano-sized selenium particles is problematic, as these can become bioavailable by direct assimilation or reoxidize to selenite and selenate. Dimethlyselenide and dimethyldiselenide, two species with unknown ecotoxicological long-term effects, contributed substantially to selenium dissolved in the effluent. Their formation was induced by minor temperature changes during biological reduction, thus a careful process control might drastically increase removal success of existing biotreatment systems for selenium and is a prerequisite for successful removal in full scale applications.

Consequently, remediative systems aiming at minimizing ecotoxicological risks on the one hand and selenium recovery and reuse on the other hand should be implemented. Due to the "high volume - low concentration" character, no sustainable solution has been found yet to treat selenium-contaminated drainage waters originating from the San Joachin Valley, one of the agriculturally most productive areas of the US (a comprehensive report by the USGS is available at http://pubs.usgs.gov/pp/p1646/pdf/pp1646.pdf).


'/>"/>

Contact: Sara Uttech
suttech@soils.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

Related biology news :

1. Mate selection more biologically determined in some human populations
2. Interdisciplinary volume on biological rhythms serves as both primer and in-depth resource
3. Biological invasions increasing due to freshwater impoundments, says CU-Boulder study
4. Study shows more genes are controlled by biological clocks
5. Light receptors in eye play key role in setting biological clock, study shows
6. Francisella tularensis: Stopping a biological weapon
7. Tips on how to build a better home for biological parts
8. Genomics of large marine animals showcased in the biological bulletin
9. Securing the future of Europes biological data resources
10. Religion and the narrative of biological science
11. AIBS honors outstanding contributions to the biological sciences
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/10/2016)... 2016 --> ... "Identity and Access Management Market by Component (Provisioning, Directory ... by Organization Size, by Deployment, by Vertical, and by ... The market is estimated to grow from USD 7.20 ... at a Compound Annual Growth Rate (CAGR) of 12.2% ...
(Date:3/9/2016)... 2016 This BCC Research report provides an ... RNA Sequencing (RNA Seq) market for the years 2015, ... and reagents, data analysis, and services. Use ... RNA-Sequencing market such as RNA-Sequencing tools and reagents, RNA-Sequencing ... affecting each segment and forecast their market growth, future ...
(Date:3/9/2016)... PALM BEACH GARDENS, Fla. , March 9, ... of identity management authentication and enrollment solutions, today ... proven DigitalPersona ® Altus multi-factor ... enable IT and InfoSec managers to step-up security ... friction.  Washington, DC ...
Breaking Biology News(10 mins):
(Date:5/27/2016)... READING, England , May ... ( http://www.indegene.com ), ein führender Anbieter von ... Life-Science-Branche, Pharmaunternehmen und Gesundheitsorganisationen, und TranScrip ( ... innovativen wissenschaftlichen Support-Services für den gesamten Produktlebenszyklus, ... heute den Ausbau ihrer bestehenden Allianz an. ...
(Date:5/26/2016)... YORK , May 26, 2016 ... investors see value in this space. Today,s pre-market research on ... equities: Radius Health Inc. (NASDAQ: RDUS ), Cerus ... ARWR ), and Five Prime Therapeutics Inc. (NASDAQ: ... stock technical briefings at: http://www.activewallst.com/ ...
(Date:5/25/2016)... ... May 25, 2016 , ... Thailand’s ... at BIO 2016 in San Francisco. Located at booth number 7301, representatives from ... answer questions and discuss the Thai biotechnology and life sciences sector. , ...
(Date:5/25/2016)... ... May 25, 2016 , ... WEDI, the nation’s leading authority ... announced that Charles W. Stellar has been named by the WEDI Board of Directors ... 2016. As an executive leader with more than 35 years of experience in healthcare, ...
Breaking Biology Technology: