BioCoPro engineering of bio-based substrates on buildings and infrastructure as a basis for natural protection against corrosion

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BioCoPro

Engineering of bio-based substrates on buildings and infrastructure as a basis for natural protection against

corrosion

Michael Afanasyev, Nardy Kip, Chaozhong Qin Timo Heimovaara, Hans van Veen, Majid Hassanizadeh

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Biofilms

I An aggregate of microorganisms in which cells adhere to each other on a surface.

I Prevalent in different environments:

I _{Medical: dental plaque (tooth decay), implants}

I _{Industry: water and sewage pipes, ships}

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Biofilms and corrosion

I Cathodic depolarisation => rate of corrosion orders of magnitude higher => Pitting

Leaking underground storage tank (http://www.bushman.cc)

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Bioinduced corrosion protection

Non-porous siderite = protection

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Biofilm and corrosion protection in a porous medium

I Bioinduced precipitation

Biodeposited calcite crystals (Van Paassen, 2009)

I Corrosion in porous medium

Schematic of long term iron corrosion in soil mechanisms

(Neff et.al., 2006)

I Biofilm + corrosive agents

Concentration profiles of sulfide, oxygen, and pH in a biofilm on

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Field system characterization

Elementary distribution profiles (Neff et. al., 2005)

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Microbial community analysis

I Who is present

I What do they do

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Pore scale model

I Mass exchange between biofilms and free flow in pore spaces for Darcy scale, and upscaling of bioreaction in biofilms

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Laboratory experiments

CMT image of biofilm in porous medium

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