Thermal treatment on MSWI bottom ash fines

The municipal solid waste incineration (MSWI) bottom ash is the main by-product in the waste-to-energy plant, which accounts for about 80% of the total by-products. The further challenge after incineration is to find a suitable way to dispose or use the solid residue. It is well understood that the bottom ash contains contaminants, such as heavy metals, which pose an environmental risk. In order to reduce landfill of these residues and enhance the recycling of resources, different treatments are applied to upgrade the quality of the bottom ash, for instance, weathering, washing, etc. However, the treatments on the MSWI fine bottom ash particles are less sufficient. Hence, in this study the thermal treatment is applied on fine bottom ash and its effect on the bottom ash properties are investigated

Thermal treatment on MSWI bottom ash fines

The municipal solid waste incineration (MSWI) bottom ash is the main by-product in the waste-to-energy plant, which accounts for about 80% of the total by-products. The further challenge after incineration is to find a suitable way to dispose or use the solid residue. It is well understood that the bottom ash contains contaminants, such as heavy metals, which pose an environmental risk. In order to reduce landfill of these residues and enhance the recycling of resources, different treatments are applied to upgrade the quality of the bottom ash, for instance, weathering, washing, etc. However, the treatments on the MSWI fine bottom ash particles are less sufficient. Hence, in this study the thermal treatment is applied on fine bottom ash and its effect on the bottom ash properties are investigated

The investigation of the MSWI bottom ash fines (0-2 mm) as binder substitute after combined treatments

In this study, a series of treatments is used to upgrade the quality of the MSWI bottom ash fines (0-2 mm) from a waste-to-energy plant in the Netherlands. The efficiency of combined treatments on upgrading the quality of fine bottom ash particles to be used as cementitious material is studied. The leaching properties of treated bottom ash fines are analyzed according to the Dutch legislation. Additionally, their physical and chemical properties (density, chemical composition, hydration influence, etc.) are characterized. Finally, the hydration of the cement mixed with treated bottom ash is investigated by calorimetric measurements

Slim breken sluit materiaalkringloop

Recycling van bouw- en sloopafval (BSA) is een actueel en belangrijk thema in betononderzoek. Op Europees niveau is de jaarlijks geproduceerde hoeveelheid bouw- en sloopafval – op agrarisch afval na – de grootste afvalstroom. Betongranulaat wordt hoofdzakelijk gebruikt als ongebonden funderingsmateriaal in de wegenbouw. Een nieuwe breektechniek, genaamd smart crushing, opent de weg naar hoogwaardiger hergebruik

Liberation of original natural aggregates from recycled concrete by abrasion comminution

Recycling of concrete waste into structural concrete reduces the consumption of raw materials, decreases transport and production energy costs, and saves the use of limited landfill space. Since attached mortar is known for lowering the performance of recycled concrete aggregates (RCA) in concrete applications, current recycling involves the use of RCA as a road base material or in non-structural concrete with low strength requirements. Therefore, the application in structural concrete is limited. In general, the applicability of RCA is improved by comminution through various crushing methods. Hereby, the parent particles are cleaved or shattered into a minimum of two particles with a comparable size and a number of much smaller particles. Through this technique, both mortar and aggregates fracture alike, resulting solely in a size reduction. However, to minimise undesirable effects, original natural aggregates (ONA) have to be cleared from attached mortar. Through the use of attrition and shear instead of pressure or impact, surface layers, edges and corners are removed, producing particles both slightly smaller and much smaller than the initial. In this study, ONA liberation through abrasion was investigated

The application of treated bottom ash in mortar as cement replacement

The fine municipal solid waste incineration (MSWI) bottom ash (0-2 mm) is pre-treated and used as cement replacement to investigate its effect on the properties of mortar. The chemical and physical properties of the treated bottom ash are characterized, and the metallic aluminum content is determined. The treated bottom ash is used in mortar as cement replacement by 30% wt. The flowability of the fresh mortar with treated bottom ash is determined, and the flexural and compressive strengths of the mortar after different curing times are measured. Finally, the influential factors of the application of treated bottom ash as binder on the properties of mortar are summarized