Scholarly record
ACID MAIN DRAINAGE AS A FACTOR OF MICROBIAL INVOLVED CORROSION OF CONCRETE SAMPLES
Abstract
Mine activity and acid mine drainage formation is one of the biggest environmental problems related not only to environment components influence (soil, biosphere, plants and surface water) but also to man-made materials as concrete degradation because of its chemical composition and microorganisms’ content. Corrosion associated with microorganisms has been recognized for over 50 years and yet the study of microbial involved corrosion is relatively new. Generally, microbial involved corrosion is caused by the excretion of metabolic intermediates and/or end-products as well as exoenzymes. Bacteria, cyanobacteria, algae, lichens and fungi, together with protozoa, are all classified as microorganisms. The paper is primarily concerned with concrete specimens’ microbial involved corrosion study under laboratory conditions. In the experiment, sulphate-reducing bacteria (SRB) genera Desulfovibrio sp. and sulphur-oxidising bacteria Acidithiobacillus thiooxidans were used. Sulphur oxidizing bacteria Acidithiobacillus thiooxidans were isolated from the mixed culture obtained from the mine water (the shaft Pech, the locality Smolnik, Eastern Slovakia). The role of bacteria mentioned above has been linked to the generation of biogenic sulphuric acid resulting in corrosion process by dissolution of calcium containing minerals from the concrete matrices. Microbial involved corrosion of concrete samples proceeded in laboratory reactor by simultaneous effect of Desulfovibrio desulfuricans as sulphate-reducing bacteria (SRB) and Acidithiobacillus thiooxidans during 90 days at constant temperature of 25 oC. The concrete samples were inserted into two media installed in reactor: distilled water as reference medium and acid mine drainage as real condition approach. The leachates pH values changes of corroded samples were observed. The penetration of the corrosion was manifested by structural changes of concrete samples. Experimental studies confirmed that visible changes of concrete samples surface were observed. The disruption and the concrete surface changes under sulphuric acid effect were investigated by scanning electron microscopy (SEM).
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