Subgrade Stabilization Using Non-biodegradable Waste Material

2020 ◽  
pp. 619-628
Author(s):  
Asif Farooq ◽  
Fayaz A. Mir
Keyword(s):  
Waste Material ◽  
Biodegradable Waste ◽  
Subgrade Stabilization

Modelling heavy metal mobilisation in solid waste deposits - a predictive tool for environmental risk assessment

1999 ◽  
Vol 39 (10-11) ◽  
pp. 193-196
Author(s):  
J. Petersen ◽  
J. G. Petrie
Keyword(s):  
Heavy Metal ◽  
Solid Waste ◽  
Environmental Risk ◽  
Mechanistic Model ◽  
Small Sample ◽  
Waste Material ◽  
Metal Species ◽  
Model Parameters ◽  
Assessment Methodology ◽  
Predictive Tool

The release of heavy metal species from deposits of solid waste materials originating from minerals processing operations poses a serious environmental risk should such species migrate beyond the boundaries of the deposit into the surrounding environment. Legislation increasingly places the liability for wastes with the operators of the process that generates them. The costs for long-term monitoring and clean-up following a potential critical leakage have to be factored in the overall project plan from the outset. Thus assessment of the potential for a particular waste material to generate a harmful leachate is directly relevant for estimating the environmental risk associated with the planned disposal operation. A rigorous mechanistic model is proposed, which allows prediction of the time-dependent generation of a leachate from a solid mineral waste deposit. Model parameters are obtained from a suitably designed laboratory waste assessment methodology on a relatively small sample of the prospective waste material. The parameters are not specific to the laboratory environment in which they were obtained but are valid also for full-scale heap modelling. In this way the model, combined with the assessment methodology, becomes a powerful tool for meaningful assessment of the risks associated with solid waste disposal strategies.

UNDERSTANDING THE MOBILIZATION OF METAL POLLUTION ASSOCIATED WITH MINE WASTE MATERIAL FROM A HISTORICAL SILVER MINE IN PERU

2020 ◽  
Author(s):  
Sheyla B. Palomino Ore ◽  
◽  
Pablo Quesada Oloriz ◽  
Oscar Tafur Lopez ◽  
Junior Marca Salcedo ◽  
...  
Keyword(s):  
Metal Pollution ◽  
Mine Waste ◽  
Waste Material ◽  
Silver Mine

A review on polymer composite with waste material as reinforcement

2021 ◽  
Author(s):  
Suveer Chandra Dubey ◽  
Vivek Mishra ◽  
Abhishek Sharma
Keyword(s):  
Polymer Composite ◽  
Waste Material

Supporting decision making to achieve circularity via a biodegradable waste-to-bioenergy and compost facility

2021 ◽  
Vol 285 ◽  
pp. 112215
Author(s):  
Christos Vlachokostas ◽  
Charisios Achillas ◽  
Vasileios Diamantis ◽  
Alexandra V. Michailidou ◽  
Konstantinos Baginetas ◽  
...  
Keyword(s):  
Decision Making ◽  
Biodegradable Waste ◽  
Compost Facility

scholarly journals Enzymatic Hydrolysate of Cinnamon Waste Material as Feedstock for the Microbial Production of Carotenoids

2021 ◽  
Vol 18 (3) ◽  
pp. 1146
Author(s):  
Stefano Bertacchi ◽  
Stefania Pagliari ◽  
Chiara Cantù ◽  
Ilaria Bruni ◽  
Massimo Labra ◽  
...  
Keyword(s):  
Industrial Sector ◽  
Waste Material ◽  
Fungal Cell ◽  
Enzymatic Hydrolysate ◽  
Carbon And Nitrogen ◽  
Microbial Cell Factories ◽  
Cell Factories ◽  
Separate Hydrolysis And Fermentation ◽  
Additional Processing ◽  
Microbial Cultivation

In the context of the global need to move towards circular economies, microbial cell factories can be employed thanks to their ability to use side-stream biomasses from the agro-industrial sector to obtain additional products. The valorization of residues allows for better and complete use of natural resources and, at the same time, for the avoidance of waste management to address our needs. In this work, we focused our attention on the microbial valorization of cinnamon waste material after polyphenol extraction (C-PEW) (Cinnamomum verum J.Presl), generally discarded without any additional processing. The sugars embedded in C-PEW were released by enzymatic hydrolysis, more compatible than acid hydrolysis with the subsequent microbial cultivation. We demonstrated that the yeast Rhodosporidium toruloides was able to grow and produce up to 2.00 (±0.23) mg/L of carotenoids in the resulting hydrolysate as a sole carbon and nitrogen source despite the presence of antimicrobial compounds typical of cinnamon. To further extend the potential of our finding, we tested other fungal cell factories for growth on the same media. Overall, these results are opening the possibility to develop separate hydrolysis and fermentation (SHF) bioprocesses based on C-PEW and microbial biotransformation to obtain high-value molecules.

scholarly journals Extraction of Antioxidant Compounds from Blueberry Fruit Waste and Evaluation of Their In Vitro Biological Activity in Human Keratinocytes (HaCaT)

2021 ◽  
Author(s):  
Tomasz Piechowiak ◽  
Bartosz Skóra ◽  
Katarzyna Grzelak-Błaszczyk ◽  
Michał Sójka
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Properties ◽  
Waste Material ◽  
Lower Amount ◽  
Process Time ◽  
Antioxidant Compounds ◽  
Mass Unit ◽  
Diet Supplements ◽  
Study Results

AbstractThe purpose of this study was to investigate the biological properties of an extract obtained from the waste of blueberry fruit. The study covered the optimization of extraction of antioxidants from blueberry pomace and the determination of antioxidant properties of the extract using HaCaT as the model organism. Research showed that the yield of antioxidants extraction from blueberry waste was dependent on the applied extraction conditions. Based on the mathematical models, the optimal conditions of extraction process in which the maximum quantity of antioxidant compounds is achieved from the waste mass unit, i.e., the relation of the waste mass to the volume of ethanol equal to 1:17.36, and process time equal to 1000 s. The obtained extract was characterized by high antioxidant activity, which was shaped by high content of polyphenols, mainly anthocyanins. Moreover, the extract showed a high ability to protect HaCaT cells from the occurrence of oxidative stress induced by H2O2. Cells treated with the extract and H2O2 generated a lower amount of ROS than cells treated with H2O2 only. The obtained results will be base of further studies on applying the extract in production of diet supplements and functional foods with increased antioxidant activity. Moreover, the main research material is blueberry pomace which is a troublesome waste material for juice producers. Consequently, according to a sustainable development idea, the study results will provide an opportunity to increase interest in the problem of rational use of the waste material to a certain extent.

scholarly journals Effect of Silica Fume as a Waste Material for Sustainable Environment on the Stabilization and Dynamic Behavior of Dispersive Soil

2021 ◽  
Vol 13 (8) ◽  
pp. 4321
Author(s):  
Murat Türköz ◽  
Seyfettin Umut Umu ◽  
Ogan Öztürk
Keyword(s):  
Silica Fume ◽  
Dynamic Properties ◽  
Soil Improvement ◽  
Waste Material ◽  
Resonant Column ◽  
Engineering Applications ◽  
Positive Effects ◽  
Sustainable Environment ◽  
Earthen Dams ◽  
Dispersive Soils

The use of dispersive soils, which are common in many parts of the world, in engineering applications such as water structures, earthen dams and road embankments is possible with their improvement. Recently, the effects of different chemicals on the stabilization of dispersive soils have been investigated. The use of waste materials in stabilization is preferred both because of the more sustainable environment and the economic advantages it provides. The use of silica fume (SF) as a waste material in different engineering applications provides an important advantage in environmentally and economically sustainable ways. Many studies have been carried out regarding silica fume, especially in the construction industry. Although SF is used in many industries, there is no study about its potential impact on the stabilization and dynamic properties of dispersive soils. In this study, first, Atterberg limits and standard Proctor compaction tests were performed on the mixtures prepared by adding different SF percentages (0, 5, 10, 15, 20, 25 and 30%). Afterward, pinhole tests and resonant column tests were performed to determine dispersibility and dynamic properties on the samples prepared by compaction characteristics for each SF percentage reached. In general, it was determined that SF contributed to a change in soil class, and improvement in dispersibility and dynamic properties of the soil sample, depending on SF content; positive effects of SF were observed in terms of shallow soil improvement.

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