title: Modeling of hydrogen sulfide oxidation in concrete corrosion products from sewer pipes.
abstract: Abiotic and biotic oxidation of hydrogen sulfide related to concrete corrosion was studied in corrosion products originating from a sewer manhole. The concrete corrosion products were suspended in an acidic solution, mimicking the conditions in the pore water of corroded concrete. The removal of hydrogen sulfide and dissolved oxygen was measured in parallel in the suspension, upon which the suspension was sterilized and the measurement repeated. The results revealed the biotic oxidation to be fast compared with the abiotic oxidation. The stoichiometry of the hydrogen sulfide oxidation was evaluated using the ratio between oxygen and hydrogen sulfide uptake. The ratio for the biotic oxidation pointed in the direction of elemental sulfur being formed as an intermediate in the oxidation of hydrogen sulfide to sulfuric acid. The experimental results were applied to suggest a hypothesis and a mathematical model describing the hydrogen sulfide oxidation pathway in a matrix of corroded concrete.
authors.affiliation: Section of Environmental Engineering, Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Aalborg, Denmark. hsj@bio.aau.dk
authors.forename: Henriette Stokbro
authors.initials: HS
authors.lastname: Jensen
authors.forename: Asbjørn Haaning
authors.initials: AH
authors.lastname: Nielsen
authors.forename: Thorkild
authors.initials: T
authors.lastname: Hvitved-Jacobsen
authors.forename: Jes
authors.initials: J
authors.lastname: Vollertsen
mesh_terms: D003252:Construction Materials; D003343:Corrosion; D006862:Hydrogen Sulfide / Q000737:chemistry*; D008962:Models, Theoretical; D010084:Oxidation-Reduction
chemical_list: D006862:Hydrogen Sulfide