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Microbiologically Influenced Corrosion In Drinking Water Pipelines – Old Deposits Or Active Process?

Microbiologically Influenced Corrosion in Drinking Water Pipelines – Old Deposits or Active Process?
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In the Netherlands, a large drinking water distribution system exists which composes of a complex network of underground pipes owned by several water companies. Part of the drinking water distributions pipes consist of cast iron pipes of which some have been installed more than 80 years ago.1 To prevent leaks, it is desirable to have insight into the condition of these pipes and the risk of leakages or even pipe bursts. During local replacements and maintenance work, corrosion is regularly found in the pipes and previous research7 has indicated that Microbiologically Influenced Corrosion (MIC) may be involved in this corrosion that is found in the pipes. 

Product Number: 51322-18068-SG
Author: Elsemiek Croese, Eelco Trietsch, Jentina Schuurman, Sabine Doddema
Publication Date: 2022
Industries: Water/Wastewater , Corrosion Monitoring and Control
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In the Netherlands, a large part of the drinking water distribution system consists of cast iron pipelines of which some have been installed and are used since the beginning of the last century.  Previous investigations showed that corrosion deposits are present in many of those pipes and follow-up research showed that microbial processes have been involved in the corrosion damage. Due to the increase in water quality over the decades, the question was raised whether the MIC processes were still active in the water distribution system. To investigate whether the MIC processes were still active, RNA technology was used to investigate the microorganisms in the water distribution pipelines at corrosion defected areas. RNA is the genetic material which occurs in biological cells only when they are active. We applied two genetic technologies: RNA qPCR and RNA metagenomics by Next Generation Sequencing. With a combination of those techniques we could confirm that, despite the good water quality, MIC processes were still active and could form a direct risk in cast iron water pipes. Interestingly there seemed to be no relation between the water quality and the activity of MIC. 

In the Netherlands, a large part of the drinking water distribution system consists of cast iron pipelines of which some have been installed and are used since the beginning of the last century.  Previous investigations showed that corrosion deposits are present in many of those pipes and follow-up research showed that microbial processes have been involved in the corrosion damage. Due to the increase in water quality over the decades, the question was raised whether the MIC processes were still active in the water distribution system. To investigate whether the MIC processes were still active, RNA technology was used to investigate the microorganisms in the water distribution pipelines at corrosion defected areas. RNA is the genetic material which occurs in biological cells only when they are active. We applied two genetic technologies: RNA qPCR and RNA metagenomics by Next Generation Sequencing. With a combination of those techniques we could confirm that, despite the good water quality, MIC processes were still active and could form a direct risk in cast iron water pipes. Interestingly there seemed to be no relation between the water quality and the activity of MIC. 

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