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Adsorption Equilibrium Studies on the Example of Nitrate Removal Onto Char Produced from Waste Tires

Skwarczynska-Wojsa Agata, Szatyłowicz Ewa, Skoczko Iwona

Advances in Science and Technology. Research Journal

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2024

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Vol. 18, no 3

246--256

EN

There have been investigated potential evaluation of equilibrium adsorption isotherm for the removal of nitrates from water solutions using two types of char produced in commercial-scale pyrolysis based on recycled waste rubber tires. Liquid phase adsorption studies were performed under batch conditions and maximum adsorption capacity was determined. Equilibrium data were mathematically modelled using two-parameters Langmuir, Freundlich, three-parameters Redlich-Peterson, Toth, Dubinin-Radushkevich, Radke-Praushnitz, combined Langmuir-Freundlich and four-parameters Fritz-Schlunder, Marczewski-Jaroniec, Bi-Langmuir adsorption models. Obtained results revealed the potential use of the studied char adsorbents for nitrates removal from aqueous media (the maximum adsorption capacity at equilibrium 10.07 mg/g, have been achieved for CH-1 char). The Langmuir-Freundlich isotherm had the best fit for the adsorption experimental data over the whole concentration range. The highest percentage of NO3 removal efficiency onto CH-2 char achieved in NO3 initial concentration range from 26.44 to 66.55mg/L reaching values in the range of from 80.74 to 78.7%.

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Coupled effect of waste tire rubber and steel fibers on the mechanical properties of concrete

Waris Mohsin Adeel, Sahar Umbreen us, Akmal Usman, Khuram Nauman, Asiam Fahid, Fathi Dina

Materials Science Poland

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2022

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Vol. 40, No. 1

49--59

EN

Studies in the literature indicate that while tire crumb rubber can be added to concrete to replace some natural aggregates, steel fibers need to be introduced to overcome the compromise in the mechanical properties of concrete, especially compressive and tensile strength, that would be caused due to the addition of tire crumb rubber exclusively. In the present study, a minimum content of steel fibers has been added to mitigate the negative impact of addition of tire rubber fibers on the mechanical properties of concrete. The tire rubber fibers content was varied from 1% to 3% by volume whereas steel fibers were added from 0.1% to 0.3% by volume only. In this way, the effectiveness of hybridized concrete using tire rubber and steel fibers was evaluated based on its mechanical properties. The results revealed that inclusion of steel fibers overcame the reduction in strength and toughness of concrete to which tire rubber fibers have been added. Concrete with 2% tire rubber fibers and 0.2% steel fibers showed better mechanical performance in terms of compressive strength (10%), split tensile (14.7%), flexural strength (6.6%), and flexural toughness indices ( T150D=46% , f150D=45% ) as compared to the concrete with only 3% tire rubber fibers.

3

Bio Oil Production by Thermal and Catalytic Pyrolysis of Waste Tires

Khalaf Dunya Ahmed, Abudi Zaidun Naji, Dhaher Saadi Muhammed

Journal of Ecological Engineering

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2021

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Vol. 22, nr 8

189--199

EN

In this study, pyrolysis of shredded waste tire was carried out thermally and catalytically in a fixed bed reactor. Thermal pyrolysis was performed at temperatures of 330 °C, 430 °C, 530 °C, and 630 °C under Ar. flow rate of 0.5 L/min as a carrier gas and retention time of 15 min catalytic pyrolysis was carried out at temperature of 530 °C. The effects of temperature and two types of catalysts (CaCO3 and SiO2/Al2O3) were studied on the yield of pyrolysis products. Fourier transform infrared spectroscopy (FTIR) and Gas chromatography mass spectrometry (GC-MS) analysis for the oil products that were obtained by thermal and catalytic pyrolysis at 530 °C for chemical characterization. Oil, solid, and gas products yield by thermal pyrolysis at 530 °C were 50 wt. %, 35.6 wt. %, and 14.4 wt. % respectively, when the CaCO3 catalyst was used, the products distribution was 52 wt. %, 38.5 wt. %, and 9.5 wt. % respectively. While using SiO2 /Al2O3 the pyro oil, and char, and gas were decreased to 47 wt. %, 38 wt. %, and 15 wt. % respectively. The chemical composition of pyrolysis oil mainly included hydrocarbons compounds, predominantly Limonene which was represented by Cyclohexene, 1-methyl-4-(1-methylethenyl).

4

Modelowanie procesu pirolizy odpadów gumowych

Machniewski P., Rudniak L., Molga E.

Inżynieria i Aparatura Chemiczna

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2016

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Nr 1

28--29

PL

Przedstawiono model matematyczny procesu pirolizy odpadów gumowych pochodzących ze zużytych opon samochodowych. Wyniki obliczeń oparte na przedstawionym modelu i parametrach kinetycznych uzyskanych z analizy TG/DTG dość dobrze zgadzają się z wynikami pomiaru dla próbek o rozmiarach kilku mm. Obliczenia symulacyjne dla większych próbek (rzędu kilku cm), które są typowe dla rozdrabniaczy przemysłowych wskazują na możliwe rozbieżności obliczeń zakładających jednorodność ziaren i pomiarów, wynikające z ujawniających się oporów ruchu ciepła i masy oraz niehomogeniczności próbki w czasie pirolizy.

EN

A mathematical model of the pyrolysis process of rubber wastes composed of used tires is presented in the paper. The model predictions based on kinetic parameters obtained from TG/DTG analysis are in satisfactory agreement with the laboratory measurements, in which shred tire samples of a few millimeters in diameter were used. The calculations carried out for larger particles (of a few centimeters), typical for industrial shredders, indicate a possible divergence of “homogeneous models” predictions with the experiment due to heat and mass transfer resistance and tire inhomogeneity during the pyrolysis.

5

Metoda dekompozycji i recyklingu materiałowego opon samochodowych

Holka H., Jarzyna T.

Inżynieria i Aparatura Chemiczna

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2008

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Nr 5

11-12

PL

Bardzo istotnym światowym rozwiązaniem w gospodarce odpadami jest utylizacja zużytych opon. W artykule przedstawiono technologię utylizacji opon z wykorzystaniem strumienia wody o wysokim ciśnieniu. Zaprezentowano także wyniki badań wstępnych oraz poddano je analizie. Słowa kluczowe: water-jet, recykling, zużyte opony

EN

Utilization of tires is one of the most important world task. Different utilization methods of rubber from tires are presented in the paper. An issue of rubber removing using the high-pressure water-jet was examined. The research results were discussed.