Hexavalent chromium reduction with scrap iron in continuous-flow system. Part 2: Effect of scrap iron shape and size

Journal of Hazardous Materials
M Gheju, I Balcu

Abstract

Hexavalent chromium reduction with scrap iron has the advantage that two wastes are treated simultaneously. The reduction of hexavalent chromium by scrap iron was investigated in continuous system, using as reducing agent the following scrap iron shapes and sizes: (1) spiral fibers, (2) shavings, and (3) powder. The shape and size of scrap iron were found to have a significant influence on chromium and iron species concentration in column effluent, on column effluent pH and on Cr(VI) reduction mechanism. While for large scrap iron particles (spiral fibers) homogeneous reduction is the dominant Cr(VI) reduction process, for small scrap iron particles (powder) heterogeneous reduction appears to be the dominant reaction contributing to Cr(VI) reduction. All three shapes and sizes investigated in this work have both advantages and disadvantages. If found in sufficient quantities, scrap iron powder seem to be the optimum shape and size for the continuous reduction of Cr(VI), due to the following advantages: (1) the greatest reduction capacity, (2) the most important pH increase in column effluent (up to 6.3), (3) no chromium was detected in the column effluent during the first 60 h of the experiment, and (4) the lowest steady-state ...Continue Reading

References

Jan 1, 1993·Critical Reviews in Toxicology·M D CohenM Costa
Feb 5, 1999·Bulletin of Environmental Contamination and Toxicology·L TraviesoV Valiente
May 10, 2002·Journal of Contaminant Hydrology·K RitterR W Gillham
Sep 27, 2002·Toxicology·Debasis BagchiHarry G Preuss
Apr 2, 2003·Toxicology and Applied Pharmacology·Max Costa
Jul 2, 2003·Journal of Hazardous Materials·Li Jia YuJ L Margrave
Aug 6, 2003·FEMS Immunology and Medical Microbiology·Richa ShrivastavaU C Chaturvedi
Sep 2, 2003·Chemosphere·Taeyoon LeeJae Woo Park
Jan 1, 1997·Environmental Pollution·A OzerF Tümen
Mar 9, 2005·Journal of Hazardous Materials·Fethiye Gode, Erol Pehlivan
May 12, 2005·Environmental Science & Technology·Tamar KohnPeter J Vikesland
Aug 13, 2005·Journal of Hazardous Materials·Ya Hsuan LiouShih Chi Weng
Dec 6, 2005·Journal of Trace Elements in Medicine and Biology : Organ of the Society for Minerals and Trace Elements (GMS)·Zhenli L HePeter J Stoffella
Jan 3, 2006·Journal of Hazardous Materials·M Gheju, A Iovi
Jun 27, 2006·Mathematical Biosciences·Elisabeth PécouMauricio Gonzalez
Aug 15, 2006·Journal of Hazardous Materials·Dinesh Mohan, Charles U Pittman
Sep 11, 2007·Journal of Hazardous Materials·Shiao-Shing ChenLi-Wei Hung
Feb 1, 1986·Environmental Science & Technology·A K Sengupta, D Clifford

❮ Previous
Next ❯

Citations

Apr 8, 2011·Journal of Hazardous Materials·C Noubactep, S Caré
Dec 18, 2010·Journal of Hazardous Materials·In-Ho YoonKyoung-Woong Kim
Jul 16, 2019·Environmental Science and Pollution Research International·Zhenhua SunWeifang Chen
Jun 24, 2017·Environmental Science and Pollution Research International·Dandan HuangFei Liu

❮ 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.