Analysis of sewage sludge ashes from air and oxy-fuel combustion in a circulating fluidized-bed

Abstract

Abstract. The ashes from sewage sludge combustion in air versus O2/CO2 atmospheres with oxygen concentrations in the range of 21-40% vol. at temperature of 850°C in a 12 kW bench-scale CFB combustor were characterised. The chemical and phase composition of ashes were studied by XRF and XRD. The morphology of studied ashes were examined by SEM method. The slagging and fouling indices were calculated to study the deposition tendencies of ash. The thermal behaviour of ashes was studied by TG-DSC techniques, focusing on the mass loss and thermic effects with the increasing of temperature up to 1200C.

Highly Effective Adsorption Process of Ni(II) Ions with the Use of Sewage Sludge Fly Ash Generated by Circulating Fluidized Bed Combustion (CFBC) Technology

“…With the extension of the process, the obtained particles take on more spherical shapes or take a crystalline form. Similar observations could be observed in the literature [ 55 , 56 , 57 , 58 ]. According to the literature, the surface morphology and the specific surface area of FA particles affect the surface energy of the particles, which is responsible for the initiation of processes at the liquid–adsorbent interface.…”

Pyrolysis and gasification in the process of sewage sludge treatment

“… Phase 2 (from 200°C to 280°C) pyrolysis of the acid release, water and oil pyrolytic gases (CO, CO 2 ).  Phase 3 (from 280°C to 500°C): The release of the combustible volatile products, such as CO, CH 4 , H 2 , Methanal, methanoic acid, ethanoic acid and methanol.  Phase 4 (above 500 ºC): The carbonization process is complete.…”