Katarzyna Budzińska, Adam Traczykowski, Anita Jurek, Bożena Szejniuk, Magdalena Michalska, Krzysztof Berleć
Uniwersytet Technologiczno-Przyrodniczy, Bydgoszcz
Most processes of sewage treatment contribute to the emission of microorganisms to the air, and this most frequently takes place during an intensive flow or processes of aeration. The aim of this study was to assess the effect of individual devices of the sewage treatment plant on the degree of microbiological air pollution in the premises and in the vicinity of the tested facility. The air analyses were carried out at a mechanical and biological sewage treatment plant with an increased degree of removing organic compounds in the SBR technology of on average 1786 m3/d. In the experiment there was used the common compaction method using the sampler SAS 100. 8 research sites were appointed, including the control (background). It was found that the main source of bioaerosol emission in the studied sewage treatment plant was the decompression chamber and the Imhoff tank, and to a lesser degree, aeration chambers. For all the time of collecting samples no exceeding of permissible norms of the total number of bacteria and fungi in the air was observed. The number of staphylococci indicated that the air at all the technological facilities throughout the measurement period was moderately polluted. During all the experiment the average air pollution occurred under the influence of the presence of Pseudomonas fluorescens. The fungi species most frequently occurring in the air on the premises of the treatment plant included: Penicillium notatum, Penicillium waksmani and Penicillium viridicatum, Mucor racemosus and Cladosporium herbarum. Also Alternaria alternata occurred at all the sampling points, but this took place only in the spring period. During the conducted studies, the following species of the familyEnterobacteriaceae and other Gram-negative bacilli were determined in the air samples: Escherichia coli, Citrobacter freundii, Enterobacter cloacae, Proteus vulgaris, Serratia liquefaciens, Salmonella spp., K.pneumoniae, K.oxytoca, Yersinia enterocolitica, Vibrio, fluvialis, Pseudomonas putida, P.fluorescens and Aeromonas hydrophila. Based on the conducted assessment of air pollution on the premises of the sewage treatment plant, the occurrence of numerous microorganisms was observed. Their main emission sources were SBR reactors, bare screen stations, the Imhoff tank and the place of sludge storage. The air was assessed as moderately polluted with the bacteria Pseudomonas fluorescens, actinomyces and hemolytic staphylococci. The occurrence in the air of numerous bacteria species of the family Enterobacteriaceae poses a hazard to people employed at the sewage treatment plant.
oczyszczanie ścieków; stan sanitarny
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