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:3/22/2017)... LIVERMORE, Calif. , March 21, 2017 ... recognition analytics company serving law enforcement agencies, announced today ... Sheridan as director of public safety business development. ... of diversified law enforcement experience, including a focus on ... Vigilant. In his most recent position, Mr. Sheridan served ...
(Date:3/13/2017)... , March 13, 2017 Future of security: Biometric ... ... DERMALOGs Face Matching enables to match face pictures ... the basis to identify individuals. (PRNewsFoto/Dermalog Identification Systems) ... DERMALOG,s "Face Matching" is the fastest software for biometric Face ...
(Date:3/7/2017)... 7, 2017   HireVue , the leading provider ... identify the best talent, faster, today announced the additions ... (CSO) and Diana Kucer as Chief Marketing ... executive team poised to drive continued growth in the ... year of record bookings in 2017. "Companies ...
Breaking Biology News(10 mins):
(Date:3/22/2017)... --  iSpecimen ®, the marketplace for human ... (DPS), a full-service anatomic pathology reference lab serving ... , has joined a program offered by iSpecimen ... to make human biospecimens and associated data available to ... in 2015 as a collaboration between iSpecimen and DHIN, ...
(Date:3/22/2017)... , March 22, 2017 MarketNewsUpdates.com ... ... cancer conditions are being pressured as of late due to ... cancer pain management has a dramatic impact on patient,s quality ... and development activities for identifying new forms of opioid formulations ...
(Date:3/22/2017)... March 22, 2017   Boston Biomedical , an ... designed to target cancer stemness pathways, today announced its ... as Chief Executive Officer, effective April 24, 2017. ... J. Li , M.D., FACP, who has led Boston ... Under his leadership, Boston Biomedical has grown from a ...
(Date:3/22/2017)... (PRWEB) , ... March 21, 2017 , ... Premier executive ... & Life Science Search Firm by Hunt Scanlon Media. , Hunt Scanlon ... and the most widely referenced global news source in the human capital sector. , ...
Breaking Biology Technology: