MIC
MIC, or Microbiologically Influenced Corrosion, is corrosion of a water treatment system that can be linked to microbiological activity. MIC has been identified in all types of water systems, including cooling towers, evaporative condensers, closed loops, and fire protection systems.
Several organisms have been identified as causing MIC. The most well known are sulfate reducing bacteria, or SRB. In a typical case, a biofilm is formed that protects the organism from biocides. The biofilm also reduces the effectiveness of the scale and corrosion control treatments. After the biofilm forms, the metabolic activity of organisms results in corrosion of the metal surface.
Once MIC is identified in a system, the first step is cleaning the system. The quickest method is an off-line mechanical cleaning. If this is not possible, a chemical cleaning program can be utilized. In cleaning severely fouled systems, care must be taken to prevent plugging of screens, filters, or narrowed water passages.
In a clean system, the proper chemical treatment can prevent MIC. A complete program of scale and corrosion inhibitors, and biological control agents is required. Your Watcon rep will be glad to work with you on the program to best suit your needs.