Abstract
The paper will show a Life Cycle Assessment (LCA) of three different refurbishment scenarios for confined tank structures at a waste water treatment plant. – One using a traditional Portland cement based repair mortar, one combining this cement repair mortar with a reactive protective coating, and one using 100% calcium aluminate based repair mortar technology. In order to evaluate the sustainability and potential environmental impact of each of the three scenarios, the Life Cycle Assessments (LCA) were performed, which included Cumulative Energy Demand (CED), Global Warning Potential (GWP) and Photochemical Ozone Creation Potential (POCP). The results are compared and analyzed in this paper, particularly in relation to extending the structural service life, which shows how innovative systems can give advantages to designers and contractors, which in turn are also of benefit to their customers.
Highlights
Sewers and confined tanks in waste water treatment plants often suffer from biogenic corrosion in their areal zones
This is due to the necessary repetition of the retrofitting, as all types of Ordinary Portland Cement based system are very sensitive to acid attack generated by biogenic activities
Biogenic corrosion is a growing problem in sewers and waste treatment plants due to various different factors
Summary
Sewers and confined tanks in waste water treatment plants often suffer from biogenic corrosion in their areal zones This biogenic corrosion [1] occurs because of the transformation of the sulfates present in domestic waste water into hydrogen sulphide gas and subsequently into sulphuric acid by different strains of bacteria. One of the main features of this technology is its ability to block the transformation of hydrogen sulphide into sulphuric acid, due to the bacterio-static effect of calcium aluminate mortar. This has already been explored in various published papers [1], [2], [3]
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