Abstract
This study aimed to investigate the formation and effect of a biofilm on copper heat exchangers in full-scale system conditions. A modified Pedersen device with copper coupons was installed in parallel to a heat exchanger system to investigate several physico-chemical parameters, such as bacterial enumeration, carbohydrate content of exopolymeric substances, weight loss of test/control coupons, Cu concentrations, and corrosion products over ten months. Findings of this study showed that planktonic bacterial cells attach to each other and form a mixed-species biofilm on the copper coupon surface even though copper is toxic to a variety of microorganisms. These results also revealed that the mixed-species biofilm has a corrosive effect on copper surfaces used in cooling water systems despite the presence of biocide and the corrosion inhibitor. Additionally, it was demonstrated that a shock-dosed biocide application increased the corrosion rate on copper surface in a real system. Preventing risk of microbiologically influenced corrosion entails appropriate material selection and proper/regular chemical treatment of cooling systems. The current study provides useful insights through the evaluation of corrosion of materials with microbiological techniques.
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The authors gratefully acknowledge Bihter Minnoş, Hatice Gümüşhan, Ahmet Öztürk, Ali Yaman, and N. Özlem Şanlı Yürüdü. This study was supported by the Turkey Prime Ministry State Planning Organization (Project No: 2005K120430) and Research Fund of Istanbul University (Project No: T-897/02062006).
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Doğruöz Güngör, N., Çotuk, A., Ilhan-Sungur, E. et al. Effect of Mixed-Species Biofilm on Copper Surfaces in Cooling Water System. J. of Materi Eng and Perform 24, 848–858 (2015). https://doi.org/10.1007/s11665-014-1332-x
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DOI: https://doi.org/10.1007/s11665-014-1332-x