P o lite c h n ik a Śląska
W y d ział Inżynierii Ś ro d o w isk a i Energetyki
K atedra B io tech n o lo g ii Środow iskow ej
PRACA DOKTORSKA
Udział bakterii w powstaniu osadów obecnych
w skorodowanych rurach wodociągowych
A licja H ryniszyn
P ro m o to r
Prof. dr hab. inż. B ea ta C w alin a
Summary
The m ajority o f publications involving m icrobiologically induced corrosion in drinking w ater distribution system s include hydrated sedim ents studies. „Initially dehydrated” sedim ents have not been studied yet, playing special attention to the possibility o f m icrobial participation in their form ation and contribution to m icrobiologically induced corrosion.
The aim o f perform ed studies w as to determ ine the possibility o f bacterial participation in deposits form ation, based on results obtained through infrared spectroscopy (D R IFTS technique) and X -ray diffraction - identification o f crystalline phases occurring in collected sam ples and determ ination o f quantitative com position o f sam ples by Rietveld m ethod.
D R IFTS results show ed that drying conditions o f initially dehydrated deposits m ay im pact on sam ples com position. Intensity o f absorption bands was the lowest for lyophilized sam ples. D rying o f sam ples in air an tem peraturę o f 22°C w as the least invasive sam ples preparation m ethod
DRIFTS analysis show ed the am ides, polypeptides, fatty acids, oligosaccharides and polysaccharides presence in deposits collected from steel pipę, indicating the biofilm presence.
D R IFTS analysis dem onstrated the presence o f dipicolinic acid especially for deposits collected from steel pipę, indicating the participation o f endospore-form ing bacteria in their form ation.
X R D results indicate the contribution o f electrical m icrobially influenced corrosion to deposits form ation by sulfate reducing bacteria. It w as also suggested that bacteria reducing iron and m agnetotactic bacteria w ere involved in deposits form ation inside steel pipe. The calcite in deposits from cast iron pipe supplied w ith hard w ater indicated m icrobial corrosion absence. The presence o f m agnetite, hem atite and goethite in sam ples collected from steel pipe suggested the contribution o f iron oxidising bacteria to corrosion or abiotic corrosion.
