Investigation of the mode of action and impacts of microbial induced bio-corrosion and aging of components in biogas conducting equipment and possibilities for minimization and prevention.

Due to the microbial consortium in biogas plants various chemical and biological processes are taking place. The microorganisms not only grow in the fermenter, but also in the inside of biogas conducting pipes and equipment and lead, by interaction with the material surface, to corrosive damage. This bio-corrosion leads to an accelerated material aging and subsequently to increased maintenance measures. Both, metals and plastics are affected.

The aim of the project is a detailed investigation of the mechanism of microbial corrosion induced material damage in a typical renewable-resources-based German biogas plant, with focus on sulfate reducing bacteria. Based on an in-depth material screening five plastics and 2 metals will be investigated.

The investigation will be performed for all relevant process steps: raw biogas (fermenter), partially purified biogas (after drying and desulfurization), and purified biogas applicable for the natural gas grid (after carbon dioxide removal and drying). In the framework of the project and over a period of 30 month the impacts and factors of the composition of microorganisms and gases on the materials will be investigated. Based on the test results the parameters of bio-corrosion can be derived, from which clear recommendations and appropriate material selections for minimization measures (or avoidance) can be defined. Consequently, possibilities are given to reduce maintenance costs of existing plants and maintenance of new plants can be kept low with the correct choice of material. The project contributes to the support of companies involved in biogas production to improve their competitiveness and profitability.

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