scholarly journals Modeling Nickel Leaching from Abandoned Mine Tailing Deposits in Jøssingfjorden

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 967
Author(s):  
Svetlana Pakhomova ◽  
Evgeniy Yakushev ◽  
Morten Thorne Schaanning
Keyword(s):  
Water Column ◽  
Mine Tailing ◽  
Point Of View ◽  
Biogeochemical Model ◽  
Sediment Reworking ◽  
Long Term Storage ◽  
Best Available Technology ◽  
Available Technology ◽  
Nickel Leaching

Underwater disposal of mine tailings in lakes and seas has been considered favorable due to the geochemical stability obtained during long-term storage in anoxic sediments. Sulfides are stable in the ore; however, oxidation and transformation of some substances into more soluble forms may impact bioavailability processes and enhance the risk of toxic effects in the aquatic environment. The goal of this work was to construct a model for simulating the nickel (Ni) cycle in the water column and upper sediments and apply it to the mine tailing sea deposit in the Jøssingfjord, SouthWest Norway. A one-dimensional (1D) benthic–pelagic coupled biogeochemical model, BROM, supplemented with a Ni module specifically developed for the study was used. The model was optimized using field data collected from the fjord. The model predicted that the current high Ni concentrations in the sediment can be a potential source of Ni leaching to the water column until about 2040. The top 10 cm of sediments were classified as being of “poor” environmental state according to the Norwegian Quality Standards. A numerical experiment predicted that with complete cessation of the discharges there would be an improvement in the environmental state of sediment to “good” in about 20 years. On the other hand, doubling of discharge would lead to an increase in the Ni content in the sediment, approaching the boundary of the “very poor” environmental state. The model results demonstrated that Ni leaching from the sea deposits may be increased due to sediment reworking by bioturbation at the sediment–water interface. The model can be an instrument for analysis of different scenarios for mine tailing activities from point of view of reduction of environmental impact as a component of the best available technology.

scholarly journals Fungus Evaluation from Seeds Germplasm before Medium and Long Term Storage

2016 ◽  
Vol 49 (3) ◽  
pp. 71-82
Author(s):  
Domnica Daniela Plăcintă ◽  
Danela Murariu
Keyword(s):  
Agar Medium ◽  
Point Of View ◽  
Perennial Grasses ◽  
Paper Substrate ◽  
Fungal Parasite ◽  
Blotting Paper ◽  
Long Term Storage ◽  
Seed Health ◽  
Term Storage

Abstract During 2000-2016, 213 entries from 29 plant species from different crop groups (cereals, legumes, industrial crops, perennial grasses, vegetables, cucurbits, aromatic and medicinal plants) from core collection of the Suceava Genebank were evaluated from phytosanitary status point of view, before the storing. The seeds testing to the micromycetes incidence in the laboratory by incubating of them on blotting paper substrate and agar medium was performed. Fungal saprophytes from genus as: Alternaria spp., Stemphylium spp., Cladosporium sp., Rhyzopus sp., Epicocum sp., Aspergillus sp., Penicillium sp., Botrytis sp. occurred frequently in seeds samples of the tested crops. Also, 12 fungal parasite were isolated: Sclerospora sp., Diplodia sp., Nigrospora sp. on maize; Drechslera spp. on wheat, barley, rye and flax; Septoria sp. on barley; Fusarium spp. on maize, barley, rye, millet, bean, pea, flax, hemp, peppers, cucumbers; Colletotrichum spp. on maize, bean and faba bean; Sclerotinia sp., Isariopsis sp. and Rhyzoctonia sp. on bean; Verticillium sp. on peppers and okra, Ascochyta sp. on pea. The obtained results were expressed as percentage of the number of fungal isolated from tested samples species, highlighting the existing microflora and need to seed health testing with major importance in maintaing of high quality germplasm avoiding the pathogens preservation and dissemination.

Evaluation of microbiological and toxicological safety of wheat grain during long-term storage

2020 ◽  
pp. 41-47
Author(s):  
K.B. Gurieva ◽  
S.L. Beletskiy
Keyword(s):  
Point Of View ◽  
Wheat Grain ◽  
Stored Grain ◽  
Anaerobic Microorganisms ◽  
Long Term Storage ◽  
Quantitative Content ◽  
Order Of Magnitude ◽  
Low Humidity ◽  
Term Storage

The article shows the conditions for the development of microflora during long-term storage of grain. The results of studies of stored grain batches on microbiological indicators and mycotoxins are presented. It was found that the number of mesophilic aerobic and facultative anaerobic microorganisms and the number of mold fungi annually decreased by an order of magnitude when storing wheat in silos of elevators. During storage in silos of elevators, the concentration of mycotoxins in wheat did not change, and after a storage cycle of 3-4 years, the quantitative content of mycotoxins met the requirements of TR CU 015/2011 "On Grain Safety". After the storage, the wheat was safe from the point of view of toxic products of microbiological origin. This was facilitated by the low humidity of wheat (no more than 13%) and the optimal temperature regime: for most of the annual cycle, the grain was in a chilled state at a temperature below 10 °C.

Disposing of Excess Weapons Materials: Past and Future of Belgian Plutonium Technology

2001 ◽  
Author(s):  
Yvon Vanderborck ◽  
Jacques Basselier
Keyword(s):  
Fission Products ◽  
Point Of View ◽  
Spent Fuel ◽  
Economic Point ◽  
Long Term Storage ◽  
Transfer Of Technology ◽  
The Us ◽  
Further Development ◽  
Term Storage

Abstract Long term storage of plutonium separated from fission products is not a good solution according to the current non-proliferation criteria as well as from an economic point of view. This material has thus to be converted to the equivalent of the “spent fuel standard”. Only one technique has so far reached the industrial maturity necessary to convert the important existing plutonium stockpiles: it is the use of plutonium to manufacture and irradiate MOX fuel. The paper reviews the existing information over the separated plutonium stockpiles and the various International Agreements, which are implemented to cover the peaceful use of plutonium. The dual track solution retained in U.S. in mentioned. The situation U.S. and Russia is updated, the roles of Europe and Belgium are presented. The activities of BELGONUCLEAIRE on the US and Russian sides will be described and its experience in fabrication technology, quality, safety, environmental issues, non-proliferation, safeguards and transport will be considered. The transfer of technology to France, Japan and US makes the MIMAS BELGONUCLEAIRE fabrication process equivalent to an international standard. This forms a sound basis for further development and for a transfer to Russia. The paper will demonstrate by this way the commitment of BELGONUCLEAIRE to participate to the peaceful uses of plutonium, as well as its contribution safely to non-proliferation and disarmament international policy.

scholarly journals Cell viability of Bifidobacterium lactis strain in long-term storage butter assessed with the plate count and fluorescence techniques

2012 ◽  
Vol 30 (No. 5) ◽  
pp. 421-428 ◽  
Author(s):  
M. Olszewska ◽  
B. Staniewski ◽  
Ł. Łaniewska-Trokenheim
Keyword(s):  
Food Product ◽  
Point Of View ◽  
Plate Count ◽  
Good Survival ◽  
Bacterial Strains ◽  
Bifidobacterium Lactis ◽  
Long Term Storage ◽  
Cell Counts ◽  
Lactis Strain

Great interest in functional products containing bacterial strains displaying health-promoting properties is expressed worldwide and is as a result connected with a demand for developing new probiotic-based products, especially those containing bifidobacteria. The Bifidobacterium strains play a key role in gastrointestinal homeostasis, providing many health-related attributes, but as fastidious microorganisms require specific conditions (e.g. anaerobic environment, neutral pH) to survive in the long-term at the needed level above 10<sup>6</sup>&nbsp;cfu/g. In consequence, not every food product guarantees optimal maintenance of Bifidobacterium viability. From this point of view, the objective of the study was to examine the survival of Bifidobacterium lactis strain in butter during long-term refrigerated storage. Two enumeration techniques: microscopic LIVE/DEAD<sup>&reg;</sup> and plating were compared by monitoring bifidobacterial counts for 4&nbsp;weeks. The plate method was characterised by underestimation of the cell counts in relation to the results evaluated microscopically. However, the good survival exhibited by B. lactis was found with both techniques. Moreover, the microscopic LIVE/DEAD<sup>&reg;</sup> method permitted to trace delicate changes in the viable/non-viable bifidobacterial population at the single-cell level. &nbsp;

Preparation And elemental analysis of ancient fibers

1987 ◽  
Vol 45 ◽  
pp. 410-411
Author(s):  
Allen Angel ◽  
Kathryn A. Jakes
Keyword(s):  
Cross Sections ◽  
Physical Structure ◽  
Energy Dispersive ◽  
Archaeological Sites ◽  
X Ray ◽  
Long Term Storage ◽  
Backscattered Electron ◽  
Electron Imaging

Fabrics recovered from archaeological sites often are so badly degraded that fiber identification based on physical morphology is difficult. Although diagenetic changes may be viewed as destructive to factors necessary for the discernment of fiber information, changes occurring during any stage of a fiber's lifetime leave a record within the fiber's chemical and physical structure. These alterations may offer valuable clues to understanding the conditions of the fiber's growth, fiber preparation and fabric processing technology and conditions of burial or long term storage (1).Energy dispersive spectrometry has been reported to be suitable for determination of mordant treatment on historic fibers (2,3) and has been used to characterize metal wrapping of combination yarns (4,5). In this study, a technique is developed which provides fractured cross sections of fibers for x-ray analysis and elemental mapping. In addition, backscattered electron imaging (BSI) and energy dispersive x-ray microanalysis (EDS) are utilized to correlate elements to their distribution in fibers.

Selective statistical estimates of multi-year monthly concentrations of biogenous pollution of small rivers of the Northwest zone of the Russian Federation

2020 ◽  
pp. 9-13
Author(s):  
Sergey Kovalenko
Keyword(s):  
Statistical Processing ◽  
Point Of View ◽  
Small Rivers ◽  
Statistical Parameters ◽  
Monthly Data ◽  
Statistical Estimates ◽  
Scientific Task ◽  
The Russian Federation ◽  
Agricultural Areas

The management of surface watercourses is an urgent scientific task. The article presents the results of statistical processing of long-term monthly data of field observations of hydrological and hydrochemical parameters along the Upper Yerga small river in the Vologda region. Sampling estimates of statistical parameters are obtained, autocorrelation and correlation analyzes are performed. The limiting periods from the point of view of pollution for water receivers receiving wastewater from drained agricultural areas are identified.

Masonry: the brittle or plastic material?

2019 ◽  
pp. 22-28
Keyword(s):  
Plastic Material ◽  
Experimental Studies ◽  
Point Of View ◽  
Plastic Properties ◽  
Plastic Deformations ◽  
Base Materials ◽  
Stress States ◽  
Creep Deformations ◽  
Structural Point

The results of experimental studies of masonry on the action of dynamic and static (short-term and long-term) loads are presented. The possibility of plastic deformations in the masonry is analyzed for different types of force effects. The falsity of the proposed approach to the estimation of the coefficient of plasticity of masonry, taking into account the ratio of elastic and total deformations of the masonry is noted. The study of the works of Soviet scientists revealed that the masonry under the action of seismic loads refers to brittle materials in the complete absence of plastic properties in it in the process of instantaneous application of forces. For the cases of uniaxial and plane stress states of the masonry, data on the coefficient of plasticity obtained from the experiment are presented. On the basis of experimental studies the influence of the strength of the so-called base materials (brick, mortar) on the bearing capacity of the masonry, regardless of the nature of the application of forces and the type of its stress state, is noted. The analysis of works of prof. S. V. Polyakov makes it possible to draw a conclusion that at the long application of the load, characteristic for the masonry are not plastic deformations, but creep deformations. It is shown that the proposals of some authors on the need to reduce the level of adhesion of the mortar to the brick for the masonry erected in earthquake-prone regions in order to improve its plastic properties are erroneous both from the structural point of view and from the point of view of ensuring the seismic resistance of structures. It is noted that the proposal to assess the plasticity of the masonry of ceramic brick walls and large-format ceramic stone with a voidness of more than 20% is incorrect, and does not meet the work of the masonry of hollow material. On the basis of the analysis of a large number of research works it is concluded about the fragile work of masonry.

Modelling of Moisture Movement in Wood during Outdoor Storage

2001 ◽  
Vol 6 (2) ◽  
pp. 3-14 ◽  
Author(s):  
R. Baronas ◽  
F. Ivanauskas ◽  
I. Juodeikienė ◽  
A. Kajalavičius
Keyword(s):  
Experimental Data ◽  
Finite Difference ◽  
Climatic Conditions ◽  
Two Dimensional ◽  
Moisture Movement ◽  
Finite Difference Technique ◽  
Long Term Storage ◽  
Space Formulation ◽  
Term Storage

A model of moisture movement in wood is presented in this paper in a two-dimensional-in-space formulation. The finite-difference technique has been used in order to obtain the solution of the problem. The model was applied to predict the moisture content in sawn boards from pine during long term storage under outdoor climatic conditions. The satisfactory agreement between the numerical solution and experimental data was obtained.

Trehalose: a cryoprotectant that enhances recovery and preserves function of human pancreatic islets after long-term storage

Diabetes ◽  
1997 ◽  
Vol 46 (3) ◽  
pp. 519-523 ◽  
Author(s):  
G. M. Beattie ◽  
J. H. Crowe ◽  
A. D. Lopez ◽  
V. Cirulli ◽  
C. Ricordi ◽  
...  
Keyword(s):  
Pancreatic Islets ◽  
Human Pancreatic Islets ◽  
Long Term Storage ◽  
Term Storage
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