scholarly journals Porous Waste Glass for Lead Removal in Packed Bed Columns and Reuse in Cement Conglomerates

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 94 ◽  
Author(s):  
Andrea Petrella ◽  
Danilo Spasiano ◽  
Marco Race ◽  
Vito Rizzi ◽  
Pinalysa Cosma ◽  
...  
Keyword(s):  
Packed Bed ◽  
Point Of View ◽  
Waste Glass ◽  
Lead Ions ◽  
Lead Removal ◽  
Nickel Ions ◽  
Thermal Insulating ◽  
Ternary Metal ◽  
Rate Controlling Step ◽  
Recycled Waste

A porous waste glass (RWPG = recycled waste porous glass) was used in wastewater treatments for the removal of lead ions from single, binary, and ternary metal solutions (with cadmium and nickel ions). Experiments were performed in columns (30 cm3, 10 g) filled with 0.5–1 mm beads till complete glass exhaustion (breakthrough). In the case of single and binary solutions, the columns were percolated at 0.2 Lh−1 (2 mg Me+2 L−1); in the case of ternary solutions, the columns were percolated at 0.15–0.4 Lh−1 (2 mg Me2+ L−1) and with 2–5 mg Me2+ L−1 influent concentration (0.2 Lh−1). Lead ions were removed mainly by ion exchange and also by adsorption. From a kinetic point of view, the rate controlling step of the process was the interdiffusion of the lead ions in the Nernst stationary liquid film around the sorbent. The uptake of the metals and the glass selectivity were confirmed by Energy Dispersive X-ray spectroscopy (EDX) analysis. After lead retention process, glass beads were reused as lightweight aggregates for thermal insulating and environmental safe mortars.

Development of New Advanced Plasters with Waste Fibers Content

2018 ◽  
Vol 276 ◽  
pp. 248-253
Author(s):  
Jiří Zach ◽  
Jitka Peterková ◽  
Vítězslav Novák
Keyword(s):  
Mechanical Properties ◽  
Building Materials ◽  
Raw Materials ◽  
Cellulose Fibers ◽  
Positive Influence ◽  
Point Of View ◽  
Pet Bottles ◽  
Thermal Insulating ◽  
Insulating Properties ◽  
Recycled Waste

The paper deals with the possibilities of using secondary raw materials in the development of new advanced lightweight plasters. It was about fibers from recycled waste materials (waste paper, PET bottles, tyres) and recycled insulation (stone wool). The aim of adding fibers to these lightweight building materials was improvement of mechanical properties, improvement thermal insulation properties and reduction of crack sensitivity. It can be stated, based on the evaluation of the selected measurements, that both types of cellulose fibers and fibers from recycled tyres had positive influence on the mechanical properties, namely in the case of compressive strength. From the point of view of thermal insulating properties, it can be said that only 2 types of fibers have reduced the value of the thermal conductivity. They were mixtures with stone fibers and with recycled tyres fibers. Both of these mixtures also showed the lowest average values of bulk density. Based on the carried out research works can be it concluded that the use of recycled tyres fibers show as optimal.

scholarly journals Bioremediation of polluted soil due to tsunami by using recycled waste glass

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Azizul Moqsud
Keyword(s):  
Heavy Metals ◽  
Electrical Conductivity ◽  
Laboratory Experiments ◽  
Saline Soil ◽  
Salt Content ◽  
Tohoku Earthquake ◽  
Polluted Soil ◽  
Waste Glass ◽  
Excess Cost ◽  
Recycled Waste

AbstractIn this research, bioremediation of tsunami-affected polluted soil has been conducted by using collective microorganisms and recycled waste glass. The Tohoku earthquake, which was a mega earthquake in Japan triggered a huge tsunami on March 11th, 2011 that caused immeasurable damage to the geo-environmental conditions by polluting the soil with heavy metals and excessive salt content. Traditional methods to clean this polluted soil was not possible due to the excess cost and efforts. Laboratory experiments were conducted to examine the capability of bioremediation of saline soil by using recycled waste glass. Different collective microorganisms which were incubated inside the laboratory were used. The electrical conductivity (EC) was measured at different specified depths. It was noticed that the electrical conductivity decreased with the assist of the microbial metabolisms significantly. Collective microorganisms (CM2) were the highly capable to reduce salinity (up to 75%) while using recycled waste glass as their habitat.

Evaluation of Glass Powder-Based Geopolymer Stabilized Road Bases Containing Recycled Waste Glass Aggregate

2020 ◽  
Vol 2674 (1) ◽  
pp. 22-32 ◽  
Author(s):  
Rui Xiao ◽  
Pawel Polaczyk ◽  
Miaomiao Zhang ◽  
Xi Jiang ◽  
Yiyuan Zhang ◽  
...  
Keyword(s):  
Glass Powder ◽  
Waste Glass ◽  
Curing Temperature ◽  
Mechanical Behaviors ◽  
Recycled Materials ◽  
Base Materials ◽  
Waste Glass Powder ◽  
Glass Aggregate ◽  
Pavement Base ◽  
Recycled Waste

As the concept of sustainable pavement gains prominence, a growing number of industrial wastes and recycled materials have been utilized in the pavement industry to preserve natural resources. This study investigates the potential use of waste glass powder-based geopolymer cement as a stabilizing agent in recycled waste glass aggregate (GA) bases. Two recycled materials, waste glass powder (GP) and class F fly ash (FF), were used as the raw materials in the preparation of geopolymer. Virgin aggregate (VA) was replaced by GA at varying replacement ratios as the pavement base materials, and the mechanical behaviors before and after geopolymer stabilization were evaluated. Without stabilization, the incorporation of over 10% GA caused significant detrimental effects on the California bearing ratios (CBR) of base materials, which should be carefully managed in pavement construction. However, all geopolymer stabilized samples showed decent strength properties, indicating the effectiveness of geopolymer stabilization. The use of GA reduced the drying shrinkage of base samples, although the mechanical properties were compromised. During the sample preparation, a higher curing temperature and relative humidity resulted in better mechanical behaviors, and the surface of GA could dissolve in alkaline solution and involve in the geopolymerization at 40°C. The microstructure and minerology of geopolymer stabilizer of base materials were characterized by scanning electron microscopy (SEM) and X-ray defraction (XRD) analyses. This study confirmed the promise of using waste glass-based pavement base materials as the greener substitutes and the potential synergy between waste glass recycling and the pavement industry.

Innovative thermal and acoustic insulation foam from recycled waste glass powder

2017 ◽  
Vol 165 ◽  
pp. 1306-1315 ◽  
Author(s):  
Giada Kyaw Oo D'Amore ◽  
Marco Caniato ◽  
Andrea Travan ◽  
Gianluca Turco ◽  
Lucia Marsich ◽  
...  
Keyword(s):  
Glass Powder ◽  
Waste Glass ◽  
Acoustic Insulation ◽  
Waste Glass Powder ◽  
Recycled Waste

scholarly journals Pre-purification of Plantago lanceolata extracts with biologically active compounds using yeast cells

2018 ◽  
Vol 11 (2) ◽  
pp. 163-169
Author(s):  
Vladimír Štefuca ◽  
Lukáš Rada ◽  
Alžbeta Chochulová ◽  
Michal Rosenberg
Keyword(s):  
Mass Transfer ◽  
Plantago Lanceolata ◽  
Packed Bed ◽  
Point Of View ◽  
Production Costs ◽  
Biologically Active ◽  
Effectiveness Factor ◽  
Packed Bed Reactor ◽  
Yeast Cells ◽  
Immobilized Cell

AbstractLeaves of the plantPlantago lanceolatacontain many economically interesting bioactive compounds, among them aucubin and catalpol are the most attractive. However, soluble saccharides passing to water extracts during isolation complicate chromatographic purification of these compounds. Their degradation by microbial cells transforming, for example, glucose, fructose, or sucrose to ethanol could bring important production costs savings and improved final product quality. It has been shown that the best saccharide degradation in extracts is achieved with theSaccharomyces cerevisiaecells. The cells were very active also in their immobilized form and they were able to completely remove glucose from the extract within four hours in a packed bed reactor combined with a stirring system with infinite medium recirculation.A simple mathematical model involving reaction kinetics and mass transfer limitations in the cell particles was proposed for the evaluation of cell effectiveness in their immobilized form in term of effectiveness factor. Values of the effectiveness factor calculated from the model were far below 1, indicating strong mass transfer limitations of the reaction. The model is suitable for optimization of preparation of immobilized cell particles, mainly from the point of view of cell charge in particles.

scholarly journals Removal of Lead Ions from Water Using Pellet Generated from Bacillus subtilis Isolated from Gold Mining Site in Niger State

2021 ◽  
Vol 6 (1) ◽  
pp. 105-112
Author(s):  
A. J. Gana ◽  
◽  
M. B. Tijjani ◽  
Y. Ocholi ◽  
E. O. Akinyelure
Keyword(s):  
Bacillus Subtilis ◽  
Removal Efficiency ◽  
Gold Mining ◽  
Lead Ions ◽  
Lead Removal ◽  
Dead Cell ◽  
Mining Site ◽  
Lead Adsorption ◽  
Physical Conditions ◽  
Adsorption Removal

This work concentrated on the isolation of lead tolerant strains of bacteria, identification of the isolated strain with the highest lead tolerance capacity using microgen identification kit. Also, the efficacy of the generated pellet (dead cell) in the bioremoval of lead from aqueous solutions was determined. A total of nine bacteria were isolated from soil collected from gold mining site in Kontagora metropolis, Niger State. Of the nine isolates, only Bacillus subtilis (KO1) possess high tolerance capacity for high levels of lead ions. The pellet generated from the Bacillus subtilis (KO1) strain was then used to adsorb lead ions from synthetic ion solutions. The isolate's removal efficiency was enhanced by optimizing several physical conditions (pH, temperature, initial lead concentration and contact time). The best optimized adsorption removal efficiency (>90%) was found at pH 3, temperature 40oC with 100 mg/L of initial concentration of lead after 3 hours of treatment. The use of the pellet generated from eco-friendly Bacillus subtilis (KO1) has great potential and additional benefits in terms of lead removal. Keywords: Bacillus subtilis; lead; adsorption; pellet; optimization

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