Study of corrosion-active microorganisms of the coastal zone of the Baltic and Barents seas

Galina Nianikova,Dmitry Vlasov,Magomed Nurmagomedov,Margarita Mayorova,Andrey Bryukhanov,Dmitry Akhaev,Inga Tsarovtseva,M Shamtsyan,S Ignateva

doi:10.1051/e3sconf/202021504001

Abstract

The composition of microbial communities in coastal zones in the area of Kislogubskaya tidal power plant (the Barents Sea) and near Saint Petersburg Flood Prevention Facility Complex in the Gulf of Finland (Baltic Sea) was studied. The enrichment and pure cultures of microorganisms of various groups (sulfate-reducing, sulfur-oxidizing, nitrifying, ammonifying and iron-oxidizing bacteria) have been isolated, their cultural and physiological-biochemical properties, as well as their ability to induce corrosion of different materials used in the construction of hydraulic structures, have been studied.

Highlights

For hydraulic structures located in different climatic zones, on the sea coasts, as well as in conditions of long-term operation, their reliability and durability are of great importance
Along with the study of physical and chemical corrosion processes, it is of great interest to study the biological corrosion of structural materials located in different climatic zones
In the area of the Kislogubskaya tidal power plant (TPP) of the branch of JSC “Leningradskaya GAES”, located in the north of the Kola Peninsula in the Kislaya Guba of the Barents Sea (Murmansk Oblast), and at Saint Petersburg Flood Prevention Facility Complex (FPFC) in the Gulf of Finland, from 2018 to 2020 samples of various construction materials were exhibited, namely cubes made of concrete mix, cubes made of wood, reinforcement with application of an organosilicate protective coating and without application (Fig. 1)

Summary

Introduction

For hydraulic structures located in different climatic zones, on the sea coasts, as well as in conditions of long-term operation (more than 50 years), their reliability and durability are of great importance. The first stage is associated with the transfer of microorganisms to the surface of various materials and metal structures [2] This process is accompanied by the release into the external environment of corrosive products of microbial metabolism: acids (organic and inorganic), exopolysaccharides, hydrogen sulfide, various enzymes, etc. The accumulation of these metabolites is an important factor in the biochemical degradation of materials [5]

Objectives

Methods

Results