scholarly journals The Chemical Fractions and Leaching of Heavy Metals in Ash from Medical Waste Incineration using Two Different Sequential Extraction Procedures

2019 ◽  
Vol 70 (1) ◽  
pp. 269-274 ◽  
Author(s):  
Lidia Kim ◽  
Gina Alina Catrina (Traistaru) ◽  
Bogdan Stanescu ◽  
Luoana Florentina Pascu ◽  
Tanase Gheorghita ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Manganese Oxides ◽  
Dry Matter ◽  
Waste Incineration ◽  
Medical Waste ◽  
Chemical Fractions ◽  
Bcr Method ◽  
Sequential Extraction Procedures ◽  
And Storage

The paper presents the chemical fractions and leaching of the heavy metals in the bottom and filter ashes from the incineration of medical waste by two comparative methods of sequential extraction and by Toxicity Characteristic Leaching Procedure test (TCLP). The BCR classic method has higher extraction percentages than proposed modified BCR method. In both ashes, the metals are predominantly bounded in F1 (exchangeable) and F2 (iron and manganese oxides) fractions. Due to the high content of metals in filter ash, representing over 17,000 mg/kg dry matter for Zn, 7,000 mg/kg dry matter for Pb, and 1,400 mg/kg dry matter for Cr and Cu in F1 and F2 fractions, a special attention should be given to the management and storage of this waste.

Fractionation of tropical soilborne heavy metals—Comparison of two sequential extraction procedures

Geoderma ◽  
2008 ◽  
Vol 143 (1-2) ◽  
pp. 168-179 ◽  
Author(s):  
Emmanuel Doelsch ◽  
Géraud Moussard ◽  
Hervé Saint Macary
Keyword(s):  
Heavy Metals ◽  
Sequential Extraction ◽  
Extraction Procedures ◽  
Sequential Extraction Procedures

scholarly journals Stablization of medical waste incineration fly ash in cement mortar matrix

2020 ◽  
Vol 55 (2) ◽  
pp. 131-138
Author(s):  
T Ahmed ◽  
R Chowdhury ◽  
M Rahman
Keyword(s):  
Heavy Metals ◽  
Compressive Strength ◽  
Fly Ash ◽  
Cement Mortar ◽  
Waste Incineration ◽  
Medical Waste ◽  
Ash Content ◽  
Engineering Properties ◽  
Waste Incineration Fly Ash ◽  
Mortar Matrix

Laboratory experiments were performed to assess the suitability of using medical waste incineration fly ash in cement as a construction material based on the engineering properties of fly ash-cement matrix and the leaching potential of toxic heavy metals from the stabilized mix. Fly ash-cement samples were prepared with different proportions of fly ash (0%, 5%, 10%, 15% and 20% by weight) in the laboratory under controlled conditions. The solidified matrix exhibited a compressive strength from 3950 to 4980 psi when fly ash is mixed in varying proportions. The 28-day compressive strength has been found to decrease with the increase in fly ash content but it meets the minimum requirement of compressive strength for cement-mortar. Soundness test exhibited acceptable results for cement-mortar mixes having up to 15% fly ash. Final and initial setting times of cement have been found to generally increase with fly ash content. Water requirement (for normal consistency) also increased with the increase in fly ash content in cement. Based on physical properties of the cement-mortar matrix it is recommended that up to 10% (by weight) medical waste incineration fly ash can be incorporated for producing cement-mortar of optimum quality. Leaching behaviors of several targeted heavy metals (As, Cu, Ni, Cd, Pb, Hg and Zn) were analyzed using Toxicity Characteristics Leaching Procedure (TCLP) of fly ash and solidified fly ash-cement matrix which shows that the leached concentrations of As, Cu, Cd, Pb and Zn were reduced by 80.13%, 89.47%, 33.33%, 23.9% and 100% respectively for 10% fly ash incorporated cement-mortar matrix compared to that of original fly ash. The leached concentrations of heavy metals from the matrix were far below the EPA land disposal limits. These results suggest that the solidified fly ash incorporated cement-mortar matrix can effectively confine and immobilize the heavy metals contained in the fly ash without significantly diminishing the engineering properties of cement-mortar. Bangladesh J. Sci. Ind. Res.55(2), 131-138, 2020

scholarly journals Seasonal Variation of the Mobility and Toxicity of Metals in Beijing’s Municipal Solid Waste Incineration Fly Ash

2021 ◽  
Vol 13 (12) ◽  
pp. 6532
Author(s):  
Hang Zhao ◽  
Yang Tian ◽  
Rong Wang ◽  
Rui Wang ◽  
Xiangfei Zeng ◽  
...  
Keyword(s):  
Fly Ash ◽  
Municipal Solid Waste ◽  
Sequential Extraction ◽  
Solid Waste ◽  
Waste Incineration ◽  
Metal Mobility ◽  
Municipal Solid Waste Incineration ◽  
Mswi Fly Ash ◽  
Leaching Toxicity ◽  
Sequential Extraction Procedures

Metal mobility and toxicity of the municipal solid waste incineration (MSWI) fly ash from different seasons in Beijing were studied using leaching toxicity procedures, sequential extraction procedures, and bioavailability procedures. The X-ray diffraction results showed that MSWI fly ash contained CaSO4, CaCO3, and KCl. The Pb, Zn, and Cd contents of MSWI fly ash were high, especially during autumn, being 42, 77, and 1260 times higher than that of their soil backgrounds, respectively. Leaching toxicity experiments showed that MSWI fly ash is hazardous, since Pb exceeded the maximum threshold (5 mg/L). The main alkali metal ions and anions, heavy metals total content, leaching concentration, chemical speciation, and bioavailability varied seasonally. The Pb and Zn leaching concentrations in summer and autumn were higher than that of the other two seasons. Sequential extraction procedures indicated that Pb, Zn, and Cd showed extremely high metal mobility, i.e., the residual states of Pb and Cd in spring were 5.83% and 1.21%, respectively, and that of Zn in autumn was 10.68%. These results will help industries, governments, and the public better understand the risk of MSWI fly ash and will urge them to pay more attention to preventing harm to the ecosystem and human beings.

scholarly journals The Use of Sequential Extraction for Assessing Environmental Risks of Waste Incineration Bottom Ash/Wykorzystanie Ekstrakcji Sekwencyjnej Do Oceny Zagrożeń Dla Środowiska Powodowanych Przez Żużle I Popioły Z

2014 ◽  
Vol 21 (3) ◽  
pp. 413-423 ◽  
Author(s):  
Grzegorz Wielgosiński ◽  
Dorota Wasiak ◽  
Alicja Zawadzka
Keyword(s):  
Thermal Treatment ◽  
Sequential Extraction ◽  
Total Concentration ◽  
Bottom Ash ◽  
Road Construction ◽  
Waste Incineration ◽  
Developed Countries ◽  
Extraction Methods ◽  
The European Union ◽  
Bcr Method

Abstract Thermal treatment of waste is one of the ways of their processing. It is commonly used in most developed countries of the European Union. Major by-products of the combustion processes are slag and bottom ash. In the majority of EU countries bottom ash and slag are used as a priming for road construction. In Poland slag and bottom ash from incineration process are stabilized with the addition of cement and some polymers and are landfilled as wastes. In accordance to Polish law, depending on the leaching of heavy metals from fly ash and slag after thermal treatment of waste can be regarded as both hazardous and non-hazardous wastes. At present work sequential extraction methods described in the literature: Tessier’s method, van Herck’s method and BCR method were compared experimentally with the results of using Swiss standard TVA.SA.1991 and European standard EN 12457 and total concentration of metals in sample analyzed after complete digestion of sample. The study sample was bottom ash from the medical waste incineration plant.

scholarly journals Environmental Risk Assessment of Heavy Metals by Exploring Chemical Fractions, Leachability, Bioavailability in Road Dusts from Steel-Industrial City (Anshan), Northeastern China

2021 ◽  
Author(s):  
Yutong Zong ◽  
Qing Xiao ◽  
Zaffar Malik ◽  
Shenggao Lu
Keyword(s):  
Heavy Metals ◽  
Risk Assessment ◽  
Sequential Extraction ◽  
Environmental Risk ◽  
Environmental Risk Assessment ◽  
Northeastern China ◽  
Residual Fraction ◽  
Chemical Fractions ◽  
Industrial City ◽  
Road Dusts

Abstract This study evaluated chemical fractions, potential leachability, and bio-accessibility of heavy metals (Cr, Cu, Cd, Ni, Pb, and Zn) in road dusts from the steel-industrial city (Anshan), Northeastern China. Chemical fractions of heavy metals were determined using Tessier sequential extraction method. The environmental risk assessment was evaluated using short-term extraction tests: TCLP, PBET, and CaCl2. Sequential extraction analysis reveals that Cr and Ni primarily existed in residual form. The non-residual fraction of heavy metals decreased in the order of Zn (average 57.78%)> Cu (39.16%)> Pb (30.73%)≈ Cd (30.67%)> Ni (19.06 %)> Cr (8.7%%). The results showed that Cd, Cu, Zn and Pb, which were extremely concentrated in potentially mobile fractions, had highly potential environmental risks. The mobility of Cd and Zn was usually higher than those of Cr, Cu, Pb and Ni, which means that Cd and Zn have higher hazardous to ecosystem. The order of bioavailability identified by PBET method was generally Zn>Cd>Pb>Ni>Cu>Cr. There was a significantly relationship between PBET, TCLP-test and bioavailable parts (F1+F2+F3+F4, SUM4) of sequential extraction, respectively. Multiple linear regression analysis indicated that toxicity and bioavailability of heavy metals were not only depended on RDs properties, but also lied on the total heavy metals.

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