كليدواژه :
عنصر يد , روش فعال سازي نوتروني , برنج , نوترونهاي فوق حرارتي , Microbiologically Influenced Corrosion , Cane sugar Industry
چكيده لاتين :
Microbiologically Influenced Corrosion (MIC) may occur in any water related industries. Such kind of corrosion is induced by many groups of microorganisms and may result of in deterioration, pitting and biofouling in pipelines, pumps and other equipments in industries.
Despite its importance, MIC is not studied in Iranian sugar industries. In this study, Karun cane sugar factory was examined in case of MIC. Tests consisted of field examinations of corrosion sites, evaluations of samples collection (with sterile vessels) and inoculation in culture media.
In the first series of tests, SRB, nitrogen bacteria, sulfur bacteria, fungi and total bacterial count (in mesophilic, termophilic and sacrophilic temperatures) in aerobic and anaerobic conditions were examined on samples. The results revealed absence of SRB, nitrogen and sulfur bacteria share of sachrophilic and anaerobic bacteria as well as abundance of bacillus, cocci and fungi in samples.
In the second series of tests, TBC tests, total fungi count, and APB (Acid Producing Bacteria) counts were done. The results revealed the presence of APB in the whole system and abundant and accumulate in some critical points. Furthermore, the results suggest that they are these three tests, as well as can indicate biocorrosion agent floura in system.
In second stage, tests were conducted in bench and field scale with biocides for this purpose, selection and dosing of biocide were done with APB and TBC tests in laboratory and finally in field (production line).
