Emission or air pollutants from fluidized bed furnaces is not as well known as emission from the traditional technologies of energetic combustion of fuels, the main source of air pollution in Poland. Boilers with circulating fluidized beds (CFB), working in Poland, proved their technical, technological economical and ecological advantages, gaining good perspective for their applications in municipal, industrial and national energetic - the more so. as they may be fueled with coal, coal slime, recycled wastes and bio-fuels. To fulfil the gap in knowledge concerning properties of dust and gases emitted to the atmospheric air from such boilers, measurements. analyses and investigations of emissions from four selected CFB boilers were performed. The examined CFB boilers belonged to the Polish heat generating plants Tychy, Chorzów ELCHO, Katowice and Jaworzno Ill (Department li). Emission of dust from cach of these four CFB boilers was measured, the dust granulometrie composition was determined and hazardous substances. such as polycyclic aromatic hydrocarbons (PAI-ls). compounds of trace elements (including heavy metals), polychlorinated dibenzodioxins (PCDD) and polychlorinated dibcnzofurans (PCDF), accumulated on the dust particles, were analysed. Emissions of sulphur dioxide. nitrogen dioxide. carbon monoxide, hydrogen chloride, hydrogen fluoride and volatile organic compounds (VOCs) were measured. The granulometrie composition of dust was determined by using a cascade impactor - this allowed avoiding errors due to dust coagulation occurring when measuring filters are used. The investigations, with their approach and methodology, are continuation of the authors' earlier investigations of emissions from combustion of coal. They present actual information on gas and dust emissions from the CBF boilers, allowing for complete evaluation of these emissions from the perspective of the environmental hazard. A synthetic result of the work is the factors for emission of total dust, PM2.5, PM I O, sulphur dioxide, nitrogen dioxide, carbon monoxide, hydrogen chloride, hydrogen fluoride, PAI-ls. YOCs, dioxins and furans from the CFB boilers, expressed in grams of emitted substance per I Mg of combusted fuel. All received results confirmed ecological advantages of combusting coal and coal slime in the CFB boilers- particularly, the low emissions of sulphur dioxide and nitrogen dioxide as well as minimal emissions of hydrogen fluoride, dioxins and heavy metals. Also, due to application of highly efficient electro-filters, the dust emission is low. The results revealed the effect of conditions of fuel combustion on emissions of some pollutants, especially PAIis and carbon monoxide.

Granulometrie composition of dust coming from main technological nodes - i.e. from the sinter plant, blast furnace and lead refinery - of the zinc smelter in Poland was investigated. Samples of dust trapped in bag filters were collected. The sieve analysis, sediment analysis and a laser analyzer of granulomeric composition were used in investigations. Mass and particle number contributions of the dust to nine granulometrie fractions having aerodynamic diameters in intervals: 0-2.5, 2.5-5, 5-10, 10-20, 20-32, 32-40, 40-63, 63-100, I 00-250 μm were determined. To determine mathematical functions describing (mass and particle number) changes in the fractional composition of each dust the results were statistically analyzed by applying the nonlinear estimation. Using of the polynomial regression provided a very good correlation between the sought functions and results of measurements. The results of measurements are presented in tables and charts. High degree of granulometrie diversity of the investigated dust samples, depending on the dust formation mechanisms, i.e. on the technology used and composition of raw materials, was noted. High share of the fine particles in the dust may be a serious hazard to human health, especially in the case of breakdown in functioning of dust collectors.

Knowledge on the physicochemical properties of PM emitted from industrial installations is necessary for assessing current state of ambient air and selecting proper methods for preventing suspended PM from degrading the air quality. Similar to many other industries, fast developing ceramic tile industry releases some amounts of PM to the atmosphere. Samples of PM were taken from main technological operations of three tile manufacturing installations, located in three various plants. The collected PM was examined for granular composition, morphology, phase composition and heavy metal content by using instrumental methods.

The aim of this research was to assess the content and composition of the pollutants emitted by domestic central heating boilers equipped with an automatic underfeed fuel delivery system for the combustion chamber. The comparative research was conducted. It concerned fuel properties, flue gas parameters, contents of dust (fl y ash) and gaseous substances polluting the air in the flue gases emitted from a domestic CH boiler burning bituminous coal, pellets from coniferous wood, cereal straw, miscanthus, and sunflower husks, coniferous tree bark, and oats and barley grain. The emission factors for dust and gaseous air pollutants were established as they are helpful to assess the contribution of such boilers in the atmospheric air pollution. When assessing the researched boiler, it was found out that despite the development in design and construction, flue gases contained fly ash with a significant EC content, which affected the air quality.