Highly efficient recovery and clean-up of four heavy metals from MSWI fly ash by integrating leaching, selective extraction and adsorption

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.

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Application of computer modelling to predict the leaching behaviour of heavy metals from MSWI fly ash and comparison with a sequential extraction method

Studies in Environmental Science - Waste Materials in Construction - Putting Theory into Practice, Proceedings of the International Conference on the Environment and Technical Implications of Construction with Alternative Materials ◽

10.1016/s0166-1116(97)80231-2 ◽

1997 ◽

pp. 481-490 ◽

Cited By ~ 1

Author(s):

P. Van Herck ◽

B. Van der Bruggen ◽

G. Vogels ◽

C. Vandecasteele

Keyword(s):

Heavy Metals ◽

Fly Ash ◽

Sequential Extraction ◽

Extraction Method ◽

Computer Modelling ◽

Mswi Fly Ash ◽

Sequential Extraction Method ◽

Leaching Behaviour

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A Novel Approach for Stabilizing Heavy Metals in Municipal Solid Waste Incineration (MSWI) Fly Ash Using Waste Fishbone Hydroxyapatite (FB-HAP)

Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (2nd Edition) - Environmental Science and Engineering ◽

10.1007/978-3-030-51210-1_124 ◽

2021 ◽

pp. 789-794

Author(s):

Amirhomayoun Saffarzadeh ◽

Mitali Nag ◽

Takeshi Nomichi ◽

Takayuki Shimaoka ◽

Hirofumi Nakayama ◽

...

Keyword(s):

Heavy Metals ◽

Fly Ash ◽

Municipal Solid Waste ◽

Solid Waste ◽

Waste Incineration ◽

Municipal Solid Waste Incineration ◽

Mswi Fly Ash ◽

Novel Approach

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Inventory of MSWI Fly Ash in Switzerland: Heavy Metal Recovery Potential and Their Properties for Acid Leaching

Processes ◽

10.3390/pr8121668 ◽

2020 ◽

Vol 8 (12) ◽

pp. 1668

Author(s):

Wolfgang Zucha ◽

Gisela Weibel ◽

Mirjam Wolffers ◽

Urs Eggenberger

Keyword(s):

Heavy Metals ◽

Fly Ash ◽

Acid Leaching ◽

Acid Neutralizing Capacity ◽

Mswi Fly Ash ◽

Mineralogical Characterization ◽

Recovery Rates ◽

Leaching Potential ◽

Geochemical Properties ◽

Neutralizing Capacity

From the year 2021 on, heavy metals from Swiss municipal solid waste incineration (MSWI) fly ash (FA) must be recovered before landfilling. This is predominantly performed by acid leaching. As a basis for the development of defined recovery rates and for the implementation of the recovery process, the authorities and plant operators need information on the geochemical properties of FA. This study provides extended chemical and mineralogical characterization of all FA produced in 29 MSWI plants in Switzerland. Acid neutralizing capacity (ANC) and metallic aluminum (Al0) were additionally analyzed to estimate the effort for acid leaching. Results show that all FA samples are composed of similar constituents, but their content varies due to differences in waste input and incineration conditions. Based on their geochemical properties, the ashes could be divided into four types describing the leachability: very good (6 FA), good (10 FA), moderate (5 FA), and poor leaching potential (8 FA). Due to the large differences it is suggested that the required recovery rates are adjusted to the leaching potential. The quantity of heavy metals recoverable by acid leaching was estimated to be 2420 t/y Zn, 530 t/y Pb, 66 t/y Cu and 22 t/y Cd.

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Hydrothermal processing of MSWI Fly Ash-towards new stable minerals and fixation of heavy metals

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2008.12.119 ◽

2009 ◽

Vol 167 (1-3) ◽

pp. 250-259 ◽

Cited By ~ 43

Author(s):

A.P. Bayuseno ◽

W.W. Schmahl ◽

Th. Müllejans

Keyword(s):

Heavy Metals ◽

Fly Ash ◽

Hydrothermal Processing ◽

Mswi Fly Ash

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Leaching of Heavy Metals from Municipal Solid Waste Incineration (MSWI) Fly Ash Using Nitric Acid

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.249-250.918 ◽

2012 ◽

Vol 249-250 ◽

pp. 918-921 ◽

Cited By ~ 5

Author(s):

Hai Ying Zhang ◽

Guo Xian Ma

Keyword(s):

Heavy Metals ◽

Fly Ash ◽

Nitric Acid ◽

Municipal Solid Waste ◽

Waste Incineration ◽

Acid Extraction ◽

Municipal Solid Waste Incineration ◽

Mswi Fly Ash ◽

Removal Ratio ◽

Solid Ratio

The presence of heavy metals in municipal solid waste incineration (MSWI) fly ash is of environmental concern due to their leaching potential in landfill environments. Acid extraction is a conventional method of safe treatment of fly ash. In this work, nitric acid was used as the extraction acid to leach Ni, Zn, Pb and Cu out from the ash. In addition, influence of nitric acid concentration and liquid to solid ratio on removal ratio of the four heavy metals was studied. It was found that removal ratio followed the decreasing sequence of Pb > Cd > Cu > Zn for acid extraction using nitric acid. The optimal extraction condition was 5.3 mol/L of nitric concentration at 20 liquid to solid ratio, which resulted in a removal ratio of 98% for Pb, 86% for Cd, around 73% for Cu and around 42% for Zn.

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Analysis of Heavy Metal Leaching in Fly Ash from One Shanghai Municipal Solid Waste Incineration (MSWI) Plant

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.531.292 ◽

2012 ◽

Vol 531 ◽

pp. 292-295

Author(s):

Hai Ying Zhang ◽

Guo Liang Yuan ◽

Guo Xian Ma

Keyword(s):

Heavy Metals ◽

Fly Ash ◽

Municipal Solid Waste ◽

Solid Waste ◽

Hazardous Waste ◽

Extraction Procedure ◽

Waste Incineration ◽

Municipal Solid Waste Incineration ◽

Mswi Fly Ash ◽

Leaching Toxicity

The characteristics and leaching behavior of heavy metals in fly ash, sampled from one MSWI (municipal solid waste incineration) plant in Shanghai China, were investigated. The results indicated that the main elements of fly ash were Fe, K, Na, Cl, Si, Ca, Al, and the total fraction of heavy metals was in the range of 0.8 % - 2.0%. Hence, MSWI fly ash was considered to be one kind of hazardous waste due to its potential environmental risk. Leaching toxicity was performed on fly ash samples from the MSWI plant in Shanghai China. Leaching toxicity of the heavy metals by the ALT (available leaching toxicity) procedure exceeded that by the HVEP (horizontal vibration extraction procedure) standard. Leaching concentrations of Ni, Zn, Cd and Pb exceeded the limit of hazardous waste identification standard. Hence, fly ash is a hazardous waste.

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