Scientific basis for the role of the oceans as a waste disposal option

Marine Policy ◽  
1986 ◽  
Vol 10 (1) ◽  
pp. 68-69
Author(s):  
Susan Peterson ◽  
John Teal
Keyword(s):  
Waste Disposal ◽  
Scientific Basis ◽  
Disposal Option

The Role of Colloids in Nuclear Waste Disposal

1983 ◽  
Vol 26 ◽  
Author(s):  
A. Avogadro ◽  
G.De Marsily
Keyword(s):  
Ground Water ◽  
Nuclear Waste ◽  
Waste Disposal ◽  
Column Experiments ◽  
Colloidal Transport ◽  
Container Material ◽  
Colloidal Fraction ◽  
Filtration Model

ABSTRACTAspects of formation and characterization of a radioactive colloidal fraction released by the waste form or produced by association with microcolloids naturally existing in ground water or produced either by corrosion of container material or by degradation of backfill material are discussed. A filtration model has been developed in order to describe colloidal transport under field conditions. Comparison between data obtained with laboratory column experiments and theoretical evaluations is presented.

scholarly journals An Essential Role of Polymeric Adhesives in the Reinforcement of Acidified Paper Relics

Polymers ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 207
Author(s):  
Jiaojiao Liu ◽  
Huiping Xing ◽  
Yajun Zhou ◽  
Xiaolian Chao ◽  
Yuhu Li ◽  
...  
Keyword(s):  
Essential Role ◽  
Polyvinyl Butyral ◽  
Scientific Basis ◽  
Water Soluble ◽  
Wheat Starch ◽  
Protective Effects ◽  
Ft Ir ◽  
Starch Paste

Paper acidification causes paper relics to undergo embrittlement and decay, to form dregs, and even to break upon a single touch; therefore, reinforcement and deacidification treatments are essential steps for paper conservation and to retard the deterioration and prolong the life of objects. Polymeric adhesives play an essential role in reinforcement and deacidification treatments, although it is not well studied. In this work, the effect of polymeric adhesives on the conservation process and their protective effects on acidified paper relics were studied. Firstly, three polymeric adhesives, including wheat starch paste, polyvinyl butyral (PVB), and polyvinyl alcohol (PVA), were selected as research objects. Subsequently, their effects on four popular conservation methods were further discussed, including traditional mounting, hot-melt with silk net, alcohol-soluble cotton mesh, and water-soluble cotton mesh. Additionally, as an example, the reversibility and long-term durability of water-soluble adhesive PVA-217 were assessed. Using a computer measured and controlled folding endurance tester, pendulum tensile strength tester, tear tester, burst tester, FT-IR, video optical contact angle tester, and other instruments, the conservation application of water-soluble adhesives in paper relics was evaluated. This study provides a scientific basis and experimental data for the application of polymeric adhesives in the conservation of paper relics.

scholarly journals Role of non-traditional fodder crops in fodder production of upper Volga and the scientific basis for their cultivation in single-species and mixed sowing

2019 ◽  
Vol 2019 (2) ◽  
pp. 6-16 ◽  
Author(s):  
Сабир Эседуллаев ◽  
Sabir Esedullaev ◽  
Наталья Шмелева ◽  
Natalia Shmeleva
Keyword(s):  
Mineral Nutrition ◽  
Single Species ◽  
Scientific Basis ◽  
Forage Crops ◽  
Protein Ratio ◽  
Fodder Production ◽  
Fodder Crops ◽  
Crop Root ◽  
The Comparative Study

The results of many years of research on the comparative study of single-species and mixed crops of non-traditional forage crops, including festulolium used to create a sustainable forage base balanced in energy, protein and carbohydrates, are presented. The scientific basis for the cultivation of herbs in single and mixed sowing has been determined. It was established that the yield of green mass of festulolium is high-er than that of traditional cereal grasses and on control for an average of three years amounted to 19.8 t/ha, against the background of mineral nutrition — 29.9 t/ha. In mixed sowings, grass mixtures consisting of clover and festulolium and alfalfa and festulolium were distinguished in terms of productivi-ty and fodder value. They provided the harvest of fodder units of 7.95 and 8.65 thousand/ha, with the provision of the fodder unit with digestible protein at the level of the norm or much higher than it — 101–134 g, with an optimal (0.8–1.0) sugar-protein ratio on both backgrounds. The positive effect of grasses on soil fertility, expressed in the accumulation of a significant amount of crop-root residues and nitrogen, is shown. Single-species crops of clover and alfalfa have accumulated 9.83 and 14.8 t/ha of crop-root re-sidues at the control and 10.8 and 19.5 t/ha against the background of mineral nutrition, with which 154, 328 and 253, 431 kg, respectively, were supplied with nitrogen ha, of which symbiotic – 65, 140 and 85, 183 kg/ha.

Isolation and characterization of calcifying bacteria from “living rocks”: a possible carbon sink

2021 ◽  
Author(s):  
Maddalena del Gallo ◽  
Amedeo Mignini ◽  
Giulio Moretti ◽  
Marika Pellegrini ◽  
Paola Cacchio
Keyword(s):  
Calcium Carbonate ◽  
Carbon Sink ◽  
In Vitro Regeneration ◽  
Scientific Basis ◽  
16S Rrna Analysis ◽  
Environmental Threats ◽  
Isolation And Characterization ◽  
Definition Of

<p>CO<sub>2</sub> emissions triggered by anthropogenic and natural activities contribute to climate change, one of the current environmental threats of public and scientific concern. At present, microbially-induced biomineralization of CO<sub>2</sub> by calcium carbonate (CaCO<sub>3</sub>) is one of the highly topical study subjects as carbon stabilization process. In the present study we focused our attention on the calcifying bacteria of “living rocks”. The origin of these concretions, composed by a silicate skeleton of quartz and feldspars, merged by massive carbonate concrete, has so far been recognized as abiotic. Within this study we investigated the role of calcifying bacteria in their formation of these concretions and we isolated and characterized the species with CaCO<sub>3</sub> precipitation abilities. Concretions were sampled in Romania (Trovant) and Italy (Sibari and Rome). Samples were first analyzed for their culturable microflora (i.e. isolation, CaCO<sub>3 </sub>precipitation capability and molecular characterization). Then, in vitro regeneration tests were carried out to confirm the contribution of bacteria in the formation of these erratic masses. Moreover, natural samples and bioliths regenerated in vitro were (i) observed and analyzed by scanning electron microscopy (SEM-EDS) and (ii) characterized at molecular level by DNA extraction and 16S rRNA analysis (V3-V4 regions). By isolating and characterizing the culturable microflora, we obtained 19 calcifying isolates, with different morphological, bacteriological and mineral precipitation properties. These evidences have given a first relevant contribution for the definition of the biotic role to the formation of these concretions. These evidences were confirmed by the efficient in vitro regeneration and SEM-EDS analysis. The molecular identification of the isolates and the comparison of the data obtained from the Illumina sequencing with those present in the literature, allowed us to hypothesize the genera that most likely contributed to the formation of these concretions. The results obtained provide a good scientific basis for further studies, which should be directed towards the use of isolates in studies of environmental and socio-economic relevance. Several studies demonstrate that microbially mediated biomineralization has the potential to capture and sequester carbon. Calcium carbonate, is a stable pool of carbon and is an effective sealant to prevent CO<sub>2</sub> release back into the atmosphere.</p>

Role of biochar as a cover material in landfill waste disposal system: Perspective on unsaturated hydraulic properties

2021 ◽  
pp. 93-106
Author(s):  
Sanandam Bordoloi ◽  
Janarul Shaikh ◽  
Ján Horák ◽  
Ankit Garg ◽  
S. Sreedeep ◽  
...  
Keyword(s):  
Waste Disposal ◽  
Hydraulic Properties ◽  
System Perspective ◽  
Cover Material
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