Biocorrosion in the Central Heating System
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The results of this investigation of technogenic minerals—compounds that formed as sediment at the fittings of hydronic heating system—are presented. The morphology, mineralogy and surface chemistry of the matter were studied by X-ray diffraction, X-ray fluorescence spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. The results of this investigation provide clear evidence that hydronic heating systems have been found to support a breeding ground for bacteria associated with microbiologically influenced corrosion (MIC). Particles of neoformed compounds are crystallized in wide variety of forms: Zn minerals are presented by tabular crystals of several generations, spheres, spherical aggregates and biomorphs on the bacterial cells that probably activated fitting corrosion and promoted Zn sedimentation as sphalerite, wurtzite, hemimorphite and other Zn minerals. The formation of zinc compounds can occur both biogenically and abiogenically. Microbiologically influenced corrosion can lead to destruction of hydronic heating system elements.
KeywordsZinc minerals Fitting Spherical aggregates Hydronic heating Bacterial activity Corrosion
This work was supported by the FASO RF (project AAAA-A18-118052590032-6).
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