scholarly journals Wet-Treated MSWI Fly Ash Used as Supplementary Cementitious Material

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Martin Keppert ◽  
Jamal Akhter Siddique ◽  
Zbyšek Pavlík ◽  
Robert Černý
Keyword(s):  
Fly Ash ◽  
Waste Incineration ◽  
Cementitious Material ◽  
Mswi Fly Ash ◽  
Supplementary Cementitious Material ◽  
Before And After ◽  
Heavy Metal Immobilization ◽  
Common Technique ◽  
Strength And Durability ◽  
The Impact

Municipal solid waste incineration (MSWI) is a common technique in treatment of domestic waste. This technique annually produces approximately 25 Mt solid residues (i.e., bottom and fly ash) worldwide which is also a major issue in current research. In this research we are concerned with reusing the fly ash (FA) as supplementary cementitious material (SCM) in concrete. Such application solves the problem with heavy metal immobilization as well. To remove the high content of undesired soluble salts, number of washing treatments has been applied. Chemical composition of FA has been examined before and after treatments. The impact of cement substitution by FA in concrete was evaluated by measurement of its compressive strength and durability.

Impact From Fly Ash as Additive to Concrete on the Radiation Exposure in Dwellings

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
Govert de With
Keyword(s):  
Fly Ash ◽  
Radiation Dose ◽  
Radiation Exposure ◽  
Bulk Material ◽  
Cementitious Material ◽  
External Radiation ◽  
Supplementary Cementitious Material ◽  
Concrete Mixtures ◽  
Total Radiation Dose ◽  
The Impact

Fly ash is widely used as a supplementary cementitious material in the production of cement and concrete, and improves durability and strength of the concrete. However, as for all materials of mineral origin, fly ash is a source for natural radioactivity; hence, its need for responsible use. The aim of this study is to investigate the radiation impact from fly ash as an additive to concrete compared against concrete without fly ash. For this purpose, eight concrete mixtures are experimentally tested, followed by a computation of the radiation dose when used as bulk material in building constructions. The results demonstrate an increase in the total radiation dose from around 0.8 mSv with no fly ash up to 0.92 mSv when fly ash is used. The increase mostly comes from external radiation, while the radon exhalation factor is reduced and sometimes even reduces the radon dose despite the higher radium content. The work has demonstrated that the impact from fly ash on the radiation exposure is limited when applied as a supplementary cementitious material. At the same time, fly ash provides real benefits to the quality and durability of the concrete. For this reason, exemption strategies for such applications should be developed.

Residual Strength of Thermally Loaded Mortars with Treated Municipal Solid Waste Incineration Fly Ash Used as Supplementary Cementitious Material

2014 ◽  
Vol 982 ◽  
pp. 114-118 ◽  
Author(s):  
Martin Keppert ◽  
Kirill Polozhiy
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Building Materials ◽  
Cementitious Material ◽  
Air Pollution Control ◽  
Fly Ashes ◽  
Mswi Fly Ash ◽  
Supplementary Cementitious Material

Fly ashes collected in Air Pollution Control lines of Municipal Solid Waste Incinerators (MSWI) differ highly from fly ashes generated during coal burning what complicates their utilization in building materials production. Nevertheless after a treatment such ashes can have properties relatively comparable with coal fly ashes and thus can be used as Supplementary Cementitious Material (SCM). The water extracted MSWI fly ash was used as partial Portland cement replacement in mortars. The mortars strength evolution in time was monitored; behavior typical for pozzolans – slower increase of strength – was observed. Influence of thermal load on strength of mortars was studied as well. It can be concluded that water extracted MSWI fly ash can be used as 10 % Portland cement substitute without loss of mechanical properties.

A mini-review of heavy metal recycling technologies for municipal solid waste incineration fly ash

2021 ◽  
pp. 0734242X2110039
Author(s):  
Huan Wang ◽  
Fenfen Zhu ◽  
Xiaoyan Liu ◽  
Meiling Han ◽  
Rongyan Zhang
Keyword(s):  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Waste Incineration ◽  
Electrochemical Process ◽  
Chemical Extraction ◽  
Air Pollution Control ◽  
Municipal Solid Waste Incineration ◽  
Mswi Fly Ash ◽  
Metal Recycling

This mini-review article summarizes the available technologies for the recycling of heavy metals (HMs) in municipal solid waste incineration (MSWI) fly ash (FA). Recovery technologies included thermal separation (TS), chemical extraction (CE), bioleaching, and electrochemical processes. The reaction conditions of various methods, the efficiency of recovering HMs from MSWI FA and the difficulties and solutions in the process of technical development were studied. Evaluation of each process has also been done to determine the best HM recycling method and future challenges. Results showed that while bioleaching had minimal environmental impact, the process was time-consuming. TS and CE were the most mature technologies, but the former process was not cost-effective. Overall, it has the greatest economic potential to recover metals by CE with scrubber liquid produced by a wet air pollution control system. An electrochemical process or solvent extraction could then be applied to recover HMs from the enriched leachate. Ongoing development of TS and bioleaching technologies could reduce the treatment cost or time.

scholarly journals An Experimental Study on the Melting Solidification of Municipal Solid Waste Incineration Fly Ash

2021 ◽  
Vol 13 (2) ◽  
pp. 535
Author(s):  
Jing Gao ◽  
Tao Wang ◽  
Jie Zhao ◽  
Xiaoying Hu ◽  
Changqing Dong
Keyword(s):  
Heavy Metals ◽  
High Temperature ◽  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Liquid Slag ◽  
Melting Process ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration ◽  
Mswi Fly Ash

Melting solidification experiments of municipal solid waste incineration (MSWI) fly ash were carried out in a high-temperature tube furnace device. An ash fusion temperature (AFT) test, atomic absorption spectroscopy (AAS), scanning electron microscope (SEM), and X-ray diffraction (XRD) were applied in order to gain insight into the ash fusibility, the transformation during the melting process, and the leaching behavior of heavy metals in slag. The results showed that oxide minerals transformed into gehlenite as temperature increased. When the temperature increased to 1300 °C, 89 °C higher than the flow temperature (FT), all of the crystals transformed into molten slag. When the heating temperatures were higher than the FT, the volatilization of the Pb, Cd, Zn, and Cu decreased, which may have been influenced by the formation of liquid slag. In addition, the formation of liquid slag at a high temperature also improved the stability of heavy metals in heated slag.

Investigation of Thermodynamic Equilibrium of MSWI Fly Ash during High-Temperature Treatment

2012 ◽  
Vol 610-613 ◽  
pp. 1871-1875
Author(s):  
Jian Ding
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Thermodynamic Equilibrium ◽  
Equilibrium Composition ◽  
Waste Incineration ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Mswi Fly Ash ◽  
Component Systems ◽  
Process System

MSWI (municipal solid waste incineration) fly ash during the high-temperature treatment was a chemical reaction process system of multiphase-component systems. The thermodynamic Equilibrium of the MSWI fly ash was simulated by the part of equilibrium composition of the chemical thermodynamic calculation software HSC-Chemistry 6.0. The characteristics of heavy metals were analyzed basing on the results of simulation in a certain temperature range under different working conditions.

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