uranium Articles | Environmental XPRT

Biodegradation in oils as a geological natural analogue

A synthesis of scientific knowledge about petroleum biodegradation linked to uranium mineralisation is firstly done. Then the genesis of Huemul Uranium ore deposit (Malargüe Town, Mendoza Province) is discussed, where Uranium ore is linked only with one type of asphaltite (there are three other types) from an oil field close by. This asphaltite type would be an efficient natural geological ...

Nov. 15, 2004

By Inderscience Publishers

Depleted uranium technical brief

Depleted uranium (DU) is a byproduct of the process used to enrich natural uranium for use in nuclear reactors and in nuclear weapons. Natural uranium is composed of three isotopes; 234U, 235U, and 238U (see Table 1) [1]. The enrichment process concentrates both the 235U and the 234U isotopes in the product material, resulting in a waste product or byproduct depleted in both 235U and 234U. The ...

May 28, 2008

By US EPA - Environmental Protection Agency

Recovery and pre-concentration of uranium from secondary effluent using novel resin

The act of enrichment or improving the quality of product concentration, i.e. 'pre-concentration', has been studied with respect to uranium plant effluent, which contains uranium in 10?30 ppm level intermingled with a huge number of interfering ions, such as magnesium, in percent level. The effects of different operating conditions, such as concentration of uranium in the effluent, pH, the time ...

Jul. 1, 2010

By Inderscience Publishers

A review of uranium economics

The recent increase in the demand for power for commercial use, the challenges facing fossil fuel use and the prospective of cheap nuclear power motivate different countries to plan for the use of nuclear power. This paper reviews many aspects of uranium economics, which includes the advantages and disadvantages of nuclear power, comparisons with other sources of power, nuclear power production ...

Aug. 17, 2009

By Inderscience Publishers

Design study of medium-sized Pb-Bi cooled fast reactors with natural uranium as fuel cycle input using modified CANDLE burn-up scheme

In this study application of modified CANDLE burn-up scheme for medium-sized (800-1500 MWt) long-life Pb-Bi cooled fast reactors with natural uranium as fuel cycle input has been performed. The reactor cores are subdivided into several parts with equal volume in the axial directions. The natural uranium is initially put in region 1, after one cycle of 10 years of burn-up it is shifted to region ...

Jan. 1, 2012

By Inderscience Publishers

Biokinetic modeling of uranium in man after injection and ingestion

Uranium is a naturally occurring primordial radioactive element. Small amounts found in air, water, and food are regularly consumed and inhaled by humans. Even the military, medical, and industrial use of depleted uranium can affect humans. There is an appreciable retention of incorporated uranium in skeleton, kidneys, and liver, and a review of respective effective dose coefficients has been ...

Apr. 1, 2005

By Springer-Verlag GmbH

Removal and recovery of uranium (VI) using a fungal based low-cost biosorbent Ganoderma lucidum

The macrofungus Ganoderma lucidum was employed for removing and recovering uranium (VI) from low-level (10-100 mg/L) uranium wastewaters. Kinetic studies revealed rapid sorption, and kinetics data fitted a second-order model. Equilibrium studies revealed G. lucidum to be a potential biosorbent with specific uptake of 8.98 mg/g at pH 5 for equilibrium U(VI) concentration of 10 mg/L. To recover ...

Oct. 17, 2008

By Inderscience Publishers

Why does India require uranium through the 123 Agreement?

The government of India has taken a deliberate stand that nuclear power should be one of the components of the energy mix that the country should have for sustained economic growth. A base for this was laid in the 1960s to 1970s in collaboration with USA and Canada. However, a major part of the development, in recent decades, has been indigenous. This came about after international sanctions were ...

Aug. 14, 2008

By Inderscience Publishers

Campbell Ranch, Nevada Arsenic & Uranium Treatment - Case Study

Campbell Ranch, Nevada Arsenic & Uranium Treatment In March 2009, AdEdge Water Technologies was contacted by Indian Health Services to design, manufacture, and start up an arsenic and uranium treatment system for the Campbell Ranch community in Nevada. Arsenic concentrations were approximately 0.023 mg/L and uranium concentrations were 0.047 mg/L, well above the United States Environmental ...

Apr. 6, 2017

By Adedge Water Technologies, LLC

A design study of Pb-Bi-cooled fast reactors with natural uranium as the fuel cycle input

A conceptual design study of Pb-Bi-cooled fast reactors in which the fuel cycle needs only natural uranium input has been performed. In this design, the reactor cores are subdivided into several parts with the same volume. The region with natural uranium is put in the central core and the outer region is arranged with increasing plutonium content. In some cases, the region with natural uranium ...

Jul. 14, 2009

By Inderscience Publishers

Challenges in the design of a prototype contactor assembly for the recovery of uranium from seawater

The total estimated quantity of uranium in oceans is around four and a half billion tonnes. Harvesting uranium from seawater is much less taxing to the environment. Thus, when uranium is harvested from seawater with near-zero environmental burdens, it will become a totally green fuel in the hands of humankind, as uranium generates primary calories without giving CO2 emissions and leaves no mill ...

Apr. 2, 2009

By Inderscience Publishers

Design study of medium–sized Pb–Bi cooled fast reactors with natural uranium as fuel cycle input using modified CANDLE burn–up scheme

In this study application of modified CANDLE burn–up scheme for medium–sized (800–1500 MWt) long–life Pb–Bi cooled fast reactors with natural uranium as fuel cycle input has been performed. The reactor cores are subdivided into several parts with equal volume in the axial directions. The natural uranium is initially put in region 1, after one cycle of 10 years of burn–up it is shifted to region ...

May 24, 2012

By Inderscience Publishers

Design study of long-life Pb-Bi cooled fast reactor with natural uranium as fuel cycle input using modified CANDLE burn-up scheme

This paper reports a conceptual design study of Pb-Bi cooled fast reactors with a fuel cycle that needs only natural uranium input. In this design, the CANDLE burn-up strategy is slightly modified by introducing discrete regions. The reactor cores are subdivided into several parts with the same volume in the axial directions. The natural uranium is initially put in region 1, after one cycle of ...

Oct. 1, 2010

By Inderscience Publishers

Uranium mining and milling: material security and risk assessment

At present, physical protection for the front end of the nuclear fuel cycle is typically at a significantly lower level than at any other part of the nuclear fuel cycle. However, in view of past experiences it is feasible to take into consideration some generic threat scenarios, potentially resulting in loss of control over the nuclear material, respectively its by-products, such as: illegal ...

Jul. 25, 2007

By Inderscience Publishers

Separation of uranium from weak phosphoric acid using di-nonyl phenyl phosphoric acid in combination with tri-n-butyl phosphoric acid

A process has been described for the extraction of uranium from weak phosphoric acid using di-nonyl phenyl phosphoric acid in combination with synergistic reagent tri-n-butyl phosphate. The effect of process parameters including concentrations of extractant and phosphoric acid has been studied. A plausible extraction mechanism has been established using slope analysis technique. The enthalpy ...

May 31, 2005

By Inderscience Publishers

Biological monitoring and surveillance results of Gulf War I veterans exposed to depleted uranium

Objective: To relate medical surveillance outcomes to uranium biomonitoring results in a group of depleted uranium (DU)-exposed, Gulf War I veterans. Methods: Thirty-two veterans of Gulf War I who were victims of ‘friendly fire’ involving DU weapons, in whom exposure assessment can accurately be measured, had urine uranium concentrations determined using ICP-MS technology. Clinical laboratory ...

Jan. 1, 2006

By Springer-Verlag GmbH

Campbell Ranch, Nevada - Case Study

In March 2009, AdEdge Water Technologies was contacted by Indian Health Services to design, manufacture, and start up an arsenic and uranium treatment system for the Campbell Ranch community in Nevada. Arsenic concentrations were approximately 0.023 mg/L and uranium concentrations were 0.047 mg/L, well above the United States Environmental Protection Agencys maximum contaminant levels of 0.01 ...

Jul. 1, 2013

By Adedge Water Technologies, LLC

Isotherms, thermodynamic and mechanism studies of removal of low concentration uranium (VI) by Aspergillus niger

In order to develop an effective and economical method for removing low concentration radioactive wastewater of uranium, the biomass of ‘CMCC(F)-98003’ Aspergillus niger was investigated in a batch system. The maximum uranium adsorption capacity of 12.5 mg g−1 was obtained at the initial uranium concentration of 0.75 mg L−1. The biosorption data on a biomass concentration of 0.029 g L−1 ...

Jan. 31, 2017

By IWA Publishing

Uranium city culvert headwall, Uranium City, Sask., Canada - Case Study

In the province of Saskatchewan, Canada, Highway 962 services the remote northern community of Uranium City. Uranium City is located in the extreme northwestern cor-ner of Saskatchewan, north of Lake Athabasca, 30 mi. (48.3 km) south of the border of the Northwest Territories. The city was developed and named as a result of a significant uranium deposit that was first explored in 1946. At one ...

Jun. 10, 2009

By Presto Geosystems

Hazardous waste, ST-200ES, Illinois - Case Study

ST-200ES Transportable System shredding 55 gallon drums of uranium ore for ...

Mar. 11, 2019

By Shred-Tech Corp.

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