Fluidized bed combustion bottom ash: A better and alternative geo-material resource for construction

Abstract

Though the majority of research on fly ash has proved its worth as a construction material, the utility of bottom ash is yet questionable due to its generation during the pulverized combustion process. The bottom ash produced during the fluidized bed combustion (FBC) process is attracting more attention due to the novelty of coal combustion technology. But, to establish its suitability as construction material, it is necessary to characterize it thoroughly with respect to the geotechnical as well as mineralogical points of view. For fulfilling these objectives, the present study mainly aims at characterizing the FBC bottom ash and its comparison with pulverized coal combustion (PCC) bottom ash, collected from the same origin of coal. Suitability of FBC bottom ash as a dike filter material in contrast to PCC bottom ash in replacing traditional filter material such as sand was also studied. The suitability criteria for utilization of both bottom ash and river sand as filter material on pond ash as a base material were evaluated, and both river sand and FBC bottom ash were found to be satisfactory. The study shows that FBC bottom ash is a better geo-material than PCC bottom ash, and it could be highly recommended as an alternative suitable filter material for constructing ash dikes in place of conventional sand.

Physical and Chemical Properties, Pretreatment, and Recycling of Municipal Solid Waste Incineration Fly Ash and Bottom Ash for Highway Engineering: A Literature Review

“…Because the base is between the surface layer and the subgrade, it will not directly contact with water and soil, so it reduces the risk of heavy metal pollution and is regarded as an ideal recycling method of fly ash and bottom ash [43,186,187]. Considering the environmental safety and structural characteristics, fly ash and bottom ash must be pretreated before they are used as base materials [188].…”

Elemental analysis of residual ash generated during plasma incineration of cellulosic, rubber and plastic waste

“…The residual ash from waste incineration units are classified as bottom ashes and fly ashes (Del Valle-Zermeño et al, 2013; Quina et al, 2008; Sabbas et al, 2003). Both ash streams can be potentially hazardous depending on the type of waste feed (Gidarakos et al, 2009; Mandal et al, 2018). It is also evident from the literature that various elements have been detected using several analytical techniques during plasma incineration of municipal and medical wastes (Bakkali et al, 2013; Gomez et al, 2009; Pfandl et al, 2020; Rani et al, 2008).…”