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In order to evaluate the environmental impact resulting from co-combustion of oily sludges, a detailed characterisation of the ashes produced was carried out.The main bulk composition and the trace elements were determined, thus allowing a comparison of the ashes produced from coal to those from co-combustion of the residue with and without limestone.The leachability was evaluated with two different...
The main agricultural residues of Crete are considered to be of premium importance for local energy production through combustion. The thermal behaviour of ashes was predicted by chemical, mineralogical, microscopical and thermal analyses, while the removal of troublesome elements to reduce slagging and fouling in furnaces was tested by leaching these biomass fuels with water. Deposition tendencies...
In this work, a methodology for analysis and characterization of different ash fractions (bottom ash, 2–3rd pass ash, super-heater ash, economizer ash and filter ash) generated from the incineration of MSW in a grate firing plant is presented. The methodology is shown to provide detailed information regarding the chemical composition and the main characteristics of the generated fly and bottom ash...
The leaching behavior of heat-treated waste ash was studied to verify the possibility of the thermal treatment of waste incineration ash in existing incinerators and boiler combustion chambers. The influence of temperature, oxygen concentration and treatment time on the leaching behaviors of harmful heavy metals, especially lead (Pb) and chromium(VI) (Cr (VI)) were studied to clarify effective treatment...
In this work, the methodology for quantification of water-soluble species in ash was evaluated by varying the parameters leaching time, liquid-to-solid ratio, and size reduction by grinding. The basis for the methodology is a modification of Tessier’s sequential extraction method. This work concentrated on fly ashes from combustion of MSW in a fluidised bed boiler, and generally the amounts of water-soluble...
The Indian coal washing circuits are cursed with the availability of high ash coals having poor liberation characteristics as feed material. This result in unacceptably very low product yield (i.e. 10–15%) when aspiring for low ash clean coal (around 8–10%) for efficiently utilising it in iron making process in the form of coke. In this context, a chemical beneficiation route has been explored for...
Meeting the ever-growing demand of global energy in an eco-friendly manner necessitates the evaluation of coal and its combustion residues. For management of coal combustion and its residues on sustainable basis, characterization of trace elements and polycyclic aromatic hydrocarbons (PAHs) is imperative. The feed coal, fly ash, and bottom ash from a power plant (Unchahar, India) were evaluated. Feed...
Lignocellulosic biomass is a sustainable energy source that can help meet the demand for biofuels in the United States. However, the quality and availability of such feedstocks greatly affect their suitability for downstream conversion. This work reports the effects of dilute-acid leaching at various aqueous loadings, temperatures and catalyst loadings (sulfuric acid) on the quality of a traditional...
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