Effects of enhanced metal recovery on the recycling potential of MSWI bottom ash fractions in various legal frameworks

2021 ◽  
pp. 0734242X2110381
Author(s):  
Andreas Glauser ◽  
Gisela Weibel ◽  
Urs Eggenberger
Keyword(s):  
Heavy Metals ◽  
Bottom Ash ◽  
Metal Recovery ◽  
Leaching Tests ◽  
Threshold Values ◽  
Mswi Bottom Ash ◽  
Treatment Processes ◽  
Recycling Potential ◽  
Legal Frameworks ◽  
Ph Range

In recent years, complex new bottom ash treatment processes for enhanced metal recovery have been implemented in Switzerland, producing residual bottom ash fractions with various qualities. This study focusses on three different treatment processes by characterizing all arising fractions in detail. Thereby the factors influencing the composition of these fractions are identified and their recycling potential in Switzerland is investigated. However, high legislative requirements on total contents of heavy metals represent a high barrier for bottom ash recycling in Switzerland. Therefore, the recycling potential is further evaluated based on the waste legislation applied in the Netherlands, where recycling of bottom ash has a long tradition. There, threshold values for bottom ash recycling are based on leachate concentrations and not on total contents as in Switzerland. However, Swiss Waste Legislation also knows threshold values based on leachate concentrations for certain waste materials. The leaching tests applied in these two countries, however, are different. The comparison of both leaching tests reveals that the setup and conditions, especially the considered pH range, significantly influence the leaching of heavy metals. With emphasis on problematic pollutants, the possibilities for new applications of these fractions are evaluated based on Swiss and Dutch legal threshold values. The comparison within the legal frameworks of these two countries allows recognizing opportunities and risks related to bottom ash recycling.

Effect on Compressive Strength by Mixing Ratio of MSWI Melting Slag/Bottom Ash

2009 ◽  
Vol 620-622 ◽  
pp. 631-634
Author(s):  
Woo Keun Lee ◽  
Eun Zoo Park ◽  
Ji Hyeon Lee ◽  
Yeong Seok Yoo
Keyword(s):  
Crystal Structure ◽  
Heavy Metals ◽  
Compressive Strength ◽  
Bottom Ash ◽  
Environmental Safety ◽  
Resource Conservation ◽  
Leaching Test ◽  
Mixing Ratio ◽  
Mswi Bottom Ash ◽  
Melting Slag

In this work, inorganic paste was made from melting slag (MS) of MSWI ash and MSWI bottom ash (MBA) by geopolymer technique. Heavy metals such as Pb and Cu are highly contained in MBA. In the view of environmental protection and resource conservation, recycling of MSWI ash is desirable. MS and MBA were mixed to make inorganic paste. Compressive strength was measured to evaluate the characteristics of inorganic paste after the period of 1, 3 and 7day. Compressive strength of almost 90 MPa was obtained at the mixing ratio of MS : MBA = 9 : 1. And the crystalloid and crystal structure was analyzed by FTIR and XRD. Korea Standard leaching Test (KSLT) is also used to evaluate the environmental safety of inorganic paste. The leached concentration of Pb and Cu were 0.44 ppm and 0.15 ppm, respectively. According to this result, heavy metals were safety immobilized and stabilized.

The adsorption characteristics of heavy metals by various particle sizes of MSWI bottom ash

2003 ◽  
Vol 23 (9) ◽  
pp. 851-857 ◽  
Author(s):  
Young-Sook Shim ◽  
Young-Keun Kim ◽  
Sung-Ho Kong ◽  
Seung-Whee Rhee ◽  
Woo-Keun Lee
Keyword(s):  
Heavy Metals ◽  
Bottom Ash ◽  
Particle Sizes ◽  
Adsorption Characteristics ◽  
Mswi Bottom Ash

Heavy Metals Leaching of MSWI Bottom Ash: Effect of Short-term Natural Weathering

2017 ◽  
Author(s):  
Jurgita Seniunaitė ◽  
Saulius Vasarevičius
Keyword(s):  
Heavy Metals ◽  
Bottom Ash ◽  
Atmospheric Precipitation ◽  
Soil Surface ◽  
Natural Weathering ◽  
Short Term ◽  
Municipal Solid Wastes ◽  
Mswi Bottom Ash ◽  
Spectral Analysis Method ◽  
By Products

Municipal solid wastes incineration (MSWI) is an important part of the waste management systems in many European countries. Incineration process generates two main by-products: fly ash (FA) and bottom ash (BA). Bottom ash is composed of a variety of oxides, heavy metals and salts. Landfilling of untreated (fresh) BA can cause soil, surface and ground water contamination problems, because atmospheric precipitation in BA formed leachate, which contains of various materials. In this study investigates the influence of natural weathering to heavy metals leaching from BA. Leaching tests of bottom ash were carried out in 6 months, leachate samples were taken at 12 times (every 2 weeks). Heavy metals (Pb, Cu) concentrations were determined by atomic adsorption of spectral analysis method. The research shown, that the highest lead and copper concentration was determinated in 2 weeks weathered bottom ash leachate, respectively was 0.613 mg l–1 and 0.068 mg l–1. In both cases the concentration of Pb (0.010–0.052 mg l–1) and Cu (0.010-0.018 mg l–1) became almost stable after 12 weeks. Can be concluded, that short-term (3 months) natural weathering is sufficient time for stabilise MSWI bottom ash and heavy metals (Cu and Pb) leaching. After 18–24 weeks heavy metals concentrations stabilized and remained almost constant.

Content, mobility and transfer behavior of heavy metals in MSWI bottom ash in Zhejiang province, China

Fuel ◽  
2010 ◽  
Vol 89 (3) ◽  
pp. 616-622 ◽  
Author(s):  
Jun Yao ◽  
Wen-Bing Li ◽  
Qing-Na Kong ◽  
Yu-Yong Wu ◽  
Ruo He ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Bottom Ash ◽  
Zhejiang Province ◽  
Mswi Bottom Ash ◽  
Transfer Behavior

scholarly journals Valorization of MSWI Bottom Ash as a Function of Particle Size Distribution, Using Steam Washing

2020 ◽  
Vol 12 (22) ◽  
pp. 9461
Author(s):  
Enrico Destefanis ◽  
Caterina Caviglia ◽  
Davide Bernasconi ◽  
Erica Bicchi ◽  
Renato Boero ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Bottom Ash ◽  
Raw Material ◽  
Size Classes ◽  
Mswi Bottom Ash ◽  
Legal Limits ◽  
Chloride Sulfate ◽  
Particle Size Classes ◽  
By Products

Treatments to reduce the leaching of contaminants (chloride, sulfate, heavy metals) into the environment from bottom ash (BA) are investigated, as a function of the ash’s particle size (s). The aim is to make BA suitable for reuse as secondary raw material, in accordance with the legal requirements. Such treatments must be economically feasible and, possibly, have to use by-products of the plant (in this case, steam in excess from the turbine). For the sake of completeness and comparison, carbonation is performed on those BA particle size classes that are not positively responsive to steam washing. BA is partitioned into four different particle size classes (s ≥ 4.75, 4.75 > s ≥ 2, 2 > s ≥ 1 and s < 1 mm, corresponding to 36, 24, 13 and 27 wt%, respectively). In the case of s ≥ 2 mm (60 wt%), steam washing is effective in reducing to under the legal limits the leaching of chlorides, sulfate and heavy metals (Zn, Cu, Cd, Pb). It has been observed that steam washing causes both removal and dissolution of thin dust adherent to the BA’s surface. BA with 2 > s ≥ 1 (~13 wt% of total BA) requires a combination of steam washing and carbonation to achieve a leaching below the legal limits. The finest BA fraction, s < 1 mm (~27 wt% of total BA), is treated by carbonation, which reduces heavy metals leaching by 85%, but it fails to sufficiently curb chlorides and sulfates.

Effect of Composted Sewage Sludge on Metals Leaching Behavior in Municipal Solid Waste Incineration Bottom Ash

2013 ◽  
Vol 295-298 ◽  
pp. 418-421
Author(s):  
Hai Xia Zhang ◽  
Takayuki Shimaoka
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Sewage Sludge ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Bottom Ash ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration ◽  
Mswi Bottom Ash ◽  
Composted Sewage Sludge

In order to study the effect of organic matter on the heavy metals leachability from municipal solid waste incineration (MSWI) bottom ash. In the project, the composted sewage sludge (CS) rich in organic matter was mixed with MSWI bottom ash in a certain proportion. e exudation test, determination of the leaching liquid pH, dissolved organic carbon and humus concentration, and the concentration of heavy metals. And the combination of CS and BA in organic compounds and metal content, calculate metal leaching rate. According to the experimental results, analysis of dissolved organic matter and humic acid concentrations and Cu and Cr leaching concentration, showed that when CS mixture ratio of 20%, organic matter and humic substances concentration and Cu and Cr leaching concentrations are highly linear correlation.

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