scholarly journals Correction to: CO2 mineralization by burnt oil shale and cement bypass dust: effect of operating temperature and pre-treatment

2020 ◽  
Vol 142 (2) ◽  
pp. 1001-1001
Author(s):  
Can Rüstü Yörük ◽  
Mai Uibu ◽  
Mustafa Cem Usta ◽  
Tiit Kaljuvee ◽  
Andres Trikkel
Keyword(s):  
Oil Shale ◽  
Operating Temperature ◽  
Dust Effect ◽  
Pre Treatment ◽  
Co2 Mineralization

The article CO2 mineralization by burnt oil shale and cement bypass dust: effect of operating temperature and pre-treatment, written by Can Rüstü Yörük, Mai Uibu, Mustafa Cem Usta, Tiit Kaljuvee, Andres Trikkel.

scholarly journals Rendering Bio-Inert Low Density Polyethylene Amenable For Biodegradation Via Fast High Throughput Reactive Extrusion Assisted Oxidation

2021 ◽  
Author(s):  
Pablo Ferrero ◽  
Olivia A. Attallah ◽  
Miguel Ángel Valera ◽  
Ivana Aleksic ◽  
Muhammad Azeem ◽  
...  
Keyword(s):  
High Throughput ◽  
Operating Temperature ◽  
Crystallinity Index ◽  
Reactive Extrusion ◽  
Bacterial Attachment ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Carbonyl Index ◽  
Pre Treatment ◽  
Pretreatment Conditions

Abstract An energy efficient high throughput pre-treatment of low density polyethylene (LDPE) using a fast reactive extrusion (REX) assisted oxidation technique followed by bacterial attachment as an indicator for bio-amenability was studied. Silicon dioxide (SiO2) was selected as a model oxidizing and catalytic reagent with the REX process demonstrated to be effective both in the presence and absence of the catalyst. Optimized 5-minute duration pretreatment conditions were determined using Box-Behnken design (BBD) with respect to screws speed, operating temperature, and concentration of SiO2. The crystallinity index, carbonyl index and weight loss (%) of LDPE were used as the studied responses for BDD. FTIR and DSC spectra of the residual LDPE obtained after pretreatment with the REX assisted oxidation technique showed a significant increase in residual LDPE carbonyl index from 0 to 1.04 and a decrease of LDPE crystallinity index from 29% to 18%. Up to 5-fold molecular weight reductions were also demonstrated using GPC. Optimum LDPE pretreatment with a duration of 5 minutes was obtained at low screw speed (50 rpm), operating temperature of 380-390⁰C and variable concentration of SiO2 (0 and 2% (w/w)) indicating that effective pretreatment can occur under noncatalytic and catalysed conditions. Biofilms were successfully formed on pretreated LDPE samples after 14 days of incubation.Furthermore, the technique proposed in this study is expected to provide a high throughput approach for pretreatment of pervasive recalcitrant PE based plastics to reduce their bio inertness.

CO2 Rebinding by Oil Shale CFBC Ashes: Effect of Pre-Treatment

2009 ◽  
pp. 1123-1129
Author(s):  
Andres Trikkel ◽  
Merli Keelmann ◽  
Aljona Aranson ◽  
Rein Kuusik
Keyword(s):  
Oil Shale ◽  
Pre Treatment

scholarly journals CO2 mineralization by burnt oil shale and cement bypass dust: effect of operating temperature and pre-treatment

2020 ◽  
Vol 142 (2) ◽  
pp. 991-999
Author(s):  
Can Rüstü Yörük ◽  
Mai Uibu ◽  
Mustafa Cem Usta ◽  
Tiit Kaljuvee ◽  
Andres Trikkel
Keyword(s):  
Carbon Capture ◽  
Oil Shale ◽  
Early Stage ◽  
Kinetic Mechanism ◽  
Mineralization Process ◽  
Free Lime ◽  
Exponential Factor ◽  
Carbonation Process ◽  
Sorbent Materials ◽  
Pre Treatment

Abstract The alkaline wastes such as burnt oil shale (BOS) and cement bypass dust (BPD) generally contain free lime and portlandite which make them suitable sorbent materials for CO2 trapping via mineral carbonation technique of carbon capture and sequestration. In order to study the reaction kinetics and effect of operating parameters on carbonation processes of such alkaline wastes for future industrial sized scale-ups, as well as to identify the effects on carbonation capacity when these sorbents undergo pre-treatment and are exposed to different temperatures, BOS and BPD as sorbents in CO2 mineralization process have been investigated with thermal analysis methods in the current work. Results indicate that selected types of BOS and BPD could be used as binders in the CO2 mineralization systems, binding reasonably good amount of CO2 already in the early stage of the carbonation process which later slows down as the rate of CaO carbonation becomes mainly diffusion controlled. Increased process temperature and hydration as pre-treatment improve the CO2 binding ability, while the effect of milling has been found to be staggering and not as significant as the effect of hydration and temperature rise. The appropriate kinetic mechanism functions were determined, and the kinetic parameters—activation energy (Ea) and pre-exponential factor (A) values were calculated for all the samples. The Ea values of hydrated samples are lower for BOS samples compared to non-hydrated samples. It was shown that activation by hydration enables to reach the same CO2 uptake levels at lower temperatures, thereby making the mineralization process more energy efficient and thus lowering the costs.

Optimization of antigorite heat pre-treatment via kinetic modeling of the dehydroxylation reaction for CO2 mineralization

2011 ◽  
Vol 1 (4) ◽  
pp. 294-304 ◽  
Author(s):  
Reydick D. Balucan ◽  
Eric M. Kennedy ◽  
John F. Mackie ◽  
Bogdan Z. Dlugogorski
Keyword(s):  
Kinetic Modeling ◽  
Pre Treatment ◽  
Co2 Mineralization

scholarly journals Landfill plastic to liquid oil

2017 ◽  
Author(s):  
Dmitri Suštšik ◽  
Hella Riisalu ◽  
Rein Muoni ◽  
Mait Kriipsalu
Keyword(s):  
Heat Recovery ◽  
Liquid Fuel ◽  
Oil Shale ◽  
Plastic Waste ◽  
Cement Industry ◽  
University Of Technology ◽  
Series Of Experiments ◽  
Pre Treatment ◽  
Oil Gas ◽  
Made In

A full-scale Landfill Mining (LFM) project was made in 2012–2013 in Estonia at Kudjape Landfill. As a result of mining, mixed plastic waste was separated from excavated material. After sieving and shredding the received plastic fraction was washed and dried for further research. The waste plastic may be incinerated for energy and heat recovery or used as solid recovered fuel in cement industry. However, more favoured could be reprocessing this material to liquid fuel. A series of experiments were made to study pyrolysis of landfill plastic after being buried for up to ten years. Mixed plastic was treated thermally by semi-coking process as used by thermal treatment of oil shale in Estonia. The preliminary studies have shown, that oil, gas and solid carbon-rich residue may be received. All of these products show value as energy source. In this project, interdisciplinary research was done by Estonian University of Life Sciences (responsible for mining, sorting, pre-treatment and washing of landfill plastic), and Tallinn University of Technology (responsible for semi-coking of plastic waste and analyses of end-products). Results, conclusions, and proposals are presented in the article.

EELS characterization of “Smut” layer films on steel surface prepared for chrome plating by anodic etching

1995 ◽  
Vol 53 ◽  
pp. 538-539
Author(s):  
E Y. Wang ◽  
J. T. Cherian ◽  
A. Madsen ◽  
R. M. Fisher
Keyword(s):  
Steel Surface ◽  
Surface Preparation ◽  
Treatment Method ◽  
Chrome Plating ◽  
Transmission Electron ◽  
Alloy Steels ◽  
Pre Treatment ◽  
Hard Chrome ◽  
Electron Energy Loss

Many steel parts are electro-plated with chromium to protect them against corrosion and to improve their wear-resistance. Good adhesion of the chrome plate to the steel surface, which is essential for long term durability of the part, is extremely dependent on surface preparation prior to plating. Recently, McDonnell Douglas developed a new pre-treatment method for chrome plating in which the steel is anodically etched in a sulfuric acid and hydrofluoric acid solution. On carbon steel surfaces, this anodic pre-treatment produces a dark, loosely adhering material that is commonly called the “smut” layer. On stainless steels and nickel alloys, the surface is only darkened by the anodic pre-treatment and little residue is produced. Anodic pre-treatment prior to hard chrome plating results in much better adherence to both carbon and alloy steels.We have characterized the anodic pre-treated steel surface and the resulting “smut” layer using various techniques including electron spectroscopy for chemical analysis (ESCA) on bulk samples and transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS) on stripped films.

Evaluating the effect of a group pre-treatment chemotherapy psycho-education session for chemotherapy-naive gynecologic cancer patients and their caregivers

2021 ◽  
Vol 160 (1) ◽  
pp. 234-243
Author(s):  
Diana Samoil ◽  
Nazek Abdelmutti ◽  
Lisa Ould Gallagher ◽  
Nazlin Jivraj ◽  
Naa Kwarley Quartey ◽  
...  
Keyword(s):  
Cancer Patients ◽  
Gynecologic Cancer ◽  
Education Session ◽  
Pre Treatment
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