Reduction of selenite to elemental selenium nanoparticles by activated sludge

Environmental Science and Pollution Research International
Rohan JainPiet N L Lens

Abstract

Total selenium removal by the activated sludge process, where selenite is reduced to colloidal elemental selenium nanoparticles (BioSeNPs) that remain entrapped in the activated sludge flocs, was studied. Total selenium removal efficiencies with glucose as electron donor (2.0 g chemical oxygen demand (COD) L(-1)) at neutral pH and 30 °C gave 2.9 and 6.8 times higher removal efficiencies as compared to the electron donors lactate and acetate, respectively. Total selenium removal efficiencies of 79 (±3) and 86 (±1) % were achieved in shake flasks and fed batch reactors, respectively, at dissolved oxygen (DO) concentrations above 4.0 mg L(-1) and 30 °C when fed with 172 mg L(-1) (1 mM) Na2SeO3 and 2.0 g L(-1) COD of glucose. Continuously operated reactors operating at neutral pH, 30 °C and a DO >3 mg L(-1) removed 33.98 and 36.65 mg of total selenium per gram of total suspended solids (TSS) at TSS concentrations of 1.3 and 3.0 g L(-1), respectively. However, selenite toxicity to the activated sludge led to failure of a continuously operating activated sludge reactor at the applied loading rates. This suggests that a higher hydraulic retention time (HRT) or different reactor configurations need to be applied for selenium-removing a...Continue Reading

References

Jan 9, 2004·Applied and Environmental Microbiology·Ronald S OremlandSeamus Curran
Oct 27, 2004·Chemosphere·Athanasios S StasinakisThemistokles D Lekkas
Aug 2, 2005·Journal of Hazardous Materials·E DermouD V Vayenas
Sep 1, 1996·Applied and Environmental Microbiology·A W CantafioJ M Macy
Aug 12, 2008·Journal of Environmental Quality·Markus LenzPiet N L Lens
Aug 30, 2008·Environmental Science & Technology·Natalie C JohnsonRobert H Hurt
Sep 16, 2008·Environment International·Barry P Rosen, Zijuan Liu
Sep 27, 2008·The Science of the Total Environment·Markus Lenz, Piet N L Lens
Oct 4, 2008·Microbial Ecology in Health and Disease·Anna HaugGraham H Lyons
Feb 4, 2009·Current Microbiology·William J Hunter, Daniel K Manter
Aug 20, 2009·Biotechnology Letters·N Tejo PrakashRichard A D Pattrick
Dec 3, 2009·Environmental Science & Technology·Lenny WinkelAndrew A Meharg
Jul 7, 2010·Microbial Cell Factories·Soniya Dhanjal, Swaranjit Singh Cameotra
Dec 1, 2011·Journal of Microbiology and Biotechnology·Soniya Dhanjal, Swaranjit Singh Cameotra
May 11, 2013·Chemosphere·Hee-Jin ParkJeyong Yoon
Sep 23, 2014·Environmental Science and Pollution Research International·Lucian C StaicuMehmet A Oturan
Oct 25, 2014·Applied Microbiology and Biotechnology·Erika J Espinosa-OrtizPiet N L Lens
Dec 24, 2014·Environmental Science & Technology·Rohan JainPiet N L Lens

❮ Previous
Next ❯

Citations

Feb 13, 2019·Environmental Science and Pollution Research International·Gongli ZhangYongfeng Jia
Nov 2, 2015·Environmental Science and Pollution Research International·Yongjie WangPing Li
Jan 23, 2020·Environmental Science and Pollution Research International·Tejaswini EregowdaPiet N L Lens
Nov 14, 2018·Antonie van Leeuwenhoek·Medhat RehanLouis S Tisa
Jan 3, 2021·Environmental Science and Pollution Research International·Rewati DixitPiet Lens

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.