title: Particulate and gaseous emissions during fluidized bed combustion of semi-dried sewage sludge: effect of bed ash accumulation on NOx formation.
abstract: Combustion of two semi-dried sewage sludges in a 110 mm has been characterized in terms of particulate and gaseous emissions. Sludges differed in that they had been conditioned - at the flocculation stage of wastewater treatment - either with Ca-based inorganics or with polyelectrolytes. Combustion was efficient for both sewage sludges under all the operating conditions tested. Significant differences have instead been observed between the two types of sewage sludges as regards particulate and macro-pollutant gaseous emissions (SO2, NOx). NOx formation is significantly influenced by ash accumulation inside the bed only when sewage sludge conditioned with Ca-based inorganics is fired. The time-resolved profiles of NOx concentration and the mass flow rate of the elutriated fines have been worked out to evaluate the fuel nitrogen yield to NOx as a function of ash accumulated inside the bed divided by the air mass feed rate. Experimental results have been compared with data present in literature.
authors.affiliation: Istituto di Ricerche sulla Combustione - CNR, P.le V. Tecchio 80, 80125 Napoli, Italy. acamma@irc.cnr.it
authors.forename: A
authors.initials: A
authors.lastname: Cammarota
authors.forename: R
authors.initials: R
authors.lastname: Chirone
authors.forename: P
authors.initials: P
authors.lastname: Salatino
authors.forename: R
authors.initials: R
authors.lastname: Solimene
authors.forename: M
authors.initials: M
authors.lastname: Urciuolo
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002118:Calcium; D060729:Coal Ash; D005740:Gases; D017745:Incineration / Q000379:methods; D009589:Nitrogen Oxides / Q000032:analysis* / Q000737:chemistry; D012722:Sewage; D013458:Sulfur Dioxide / Q000032:analysis; D013997:Time Factors; D062065:Wastewater
chemical_list: D000393:Air Pollutants; D002118:Calcium; D060729:Coal Ash; D005740:Gases; D009589:Nitrogen Oxides; D012722:Sewage; D013458:Sulfur Dioxide; D062065:Wastewater