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Mildew Resistant Coatings for Ethanol Storage Tanks

Picture for Mildew Resistant Coatings for Ethanol Storage Tanks
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Mildew growth on commodity storage tanks is not a new issue within the industry and has been seen for years. However, ethanol storage tanks pose an interesting dilemma as the mildew growth on these tanks are especially aggressive and can completely deface the tanks again within months after being cleaned off. Historical knowledge of this mildew growth can be found when looking at distilleries.

Product Number: 51323-19329-SG
Author: Erik Dammen-Brower, Tony A Rook
Publication Date: 2023
$20.00
$20.00
$20.00

Fungal and mildew growth on the exterior of storage tanks for the food and beverage (alcohol distilleries and storage) and Oil and gas (ethanol storage) industries pose an aesthetic, sustainability, and maintenance issue for these market sectors. Mildew defacement on the exterior of above ground storage tanks impacts the overall energy efficiency and sustainability of these tanks as well as poses an aesthetic and a maintenance issue for their related market sectors. The black mildew growth causes the temperature of the contents to rise and accelerates the loss of product through evaporation. In addition, a casual observer of a storage tank with dark mildew growth may incorrectly perceive the defacement as industrial soot and further draw the conclusion that the facilities’ processes and products are ‘dirty’ and bad for the environment. Furthermore, cleaning mildew defacement on large storage tanks is very labor intensive and time consuming. For example, to clean a 40-foot-tall, 650,000-gallon tank can take a three-to-four-man crew with high pressure power washers an average of 2 hours to remove all mildew and fungus growth.


This paper will detail the development and performance verification testing of exterior mildew resistant coatings that do not rely heavily on zinc oxide and can combat the growth of aggressive strains of ethanol induced mildew.

Fungal and mildew growth on the exterior of storage tanks for the food and beverage (alcohol distilleries and storage) and Oil and gas (ethanol storage) industries pose an aesthetic, sustainability, and maintenance issue for these market sectors. Mildew defacement on the exterior of above ground storage tanks impacts the overall energy efficiency and sustainability of these tanks as well as poses an aesthetic and a maintenance issue for their related market sectors. The black mildew growth causes the temperature of the contents to rise and accelerates the loss of product through evaporation. In addition, a casual observer of a storage tank with dark mildew growth may incorrectly perceive the defacement as industrial soot and further draw the conclusion that the facilities’ processes and products are ‘dirty’ and bad for the environment. Furthermore, cleaning mildew defacement on large storage tanks is very labor intensive and time consuming. For example, to clean a 40-foot-tall, 650,000-gallon tank can take a three-to-four-man crew with high pressure power washers an average of 2 hours to remove all mildew and fungus growth.


This paper will detail the development and performance verification testing of exterior mildew resistant coatings that do not rely heavily on zinc oxide and can combat the growth of aggressive strains of ethanol induced mildew.

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