HYGIENIC ASSESSMENT OF CHEMICALS IN THE WORKING AIR DURING THE METALLOTHERMIC PRODUCTION OF FERROCHROME BY A SMOKELESS TECHNOLOGY

The aim of this work was to assess the chemicals in the working air during the metallothermic production of ferrochrome by a smokeless technology. The technological process under study is divided into stages. A gas-aerosol mixture releases into the working air. Its components have an acute, irritative, carcinogenic, fibrogenic, and allergenic action. This mixture also has substances, which are hazardous to human reproductive health. According to the chemical factor, the working conditions correspond to the 3rd class of 3-4 hazard degree. They are characterized by a high and very high occupational health risk for workers. The metallothermic production of ferrochrome by smokeless technology requires drawing up a number of measures aimed at minimizing the release of chemicals into the working air. Additionally, it is essential to choose high-class respiratory protective devices for workers. The identification of aerosol components need to be further studied.

Effects of return periods on flood hazard mapping: an analysis of the UFSC Campus Basin, Florianópolis city, Brazil

ABSTRACT The development of urban areas exacerbates flood risk by increasing both runoff and the exposure of population and infrastructure. In this study, we highlight the importance of return period choice on flood hazard degree and flood hydraulics characteristics. We use the UFSC campus basin as a test bed and combine a hydrological and a hydrodynamic model to define the flood hazard intensity and flood hazard degree. Six hazard intensity maps were elaborated using different return periods (2, 10, 25, 50, 100 and 500-years) that characterize low and high recurrence scenarios. The low recurrence hazard map can be ideal to verify hazard effects on buildings, while the high recurrence hazard map helps to identify people security. All variables related to the rainfall effect and its consequences (e.g. rainfall intensity, flood mean velocity, and total flood area) follow a logarithmic relationship, with a small variation for higher return periods. We highlight how different return periods can influence flood hydraulics and flood hazard and should therefore be considered in flood hazard mapping.

Procedure for risk assessment of initiation and progression of oxidation processes during development of pyrite ore deposits

In the modern conditions, the scale of subsoil transformation in the process of mineral extraction is characterized by an increased risk of accidents, often accompanied by man-made disasters. In this regard, hazard analysis and accident risk assessment is the most important scientific and technical task, the solution of which is based on methods for identification of hazards, study of development trends and assessment of consequences of theoretically possible accidents. In relation to development conditions of sulfide ore deposits, only an accident risk assessment with determination of the possible accident hazard degree, as well as preparation and timely correction of measures aimed at reduction of accident risks can ensure an acceptable level of industrial safety at the hazardous production facility.

EPIDEMIOLOGICAL ASSESSMENT OF POPULATION MIGRATION IN THE POSSIBILITY OF CHOLERA IMPORTATION INTO RUSSIAN FEDERATION CONSTITUENTS

Aim. Determination of potential epidemic hazard degree of migration in the possibility of cholera importation into the RF constituents with (without) the international border crossing points by air, sea, road and rail transport, as a component when determining the epidemic potential of the territory. Materials and methods. The data of the Rospotrebnadzor Directorates for 83 Russian Federation constituents, including 61 subjects with air, sea, road and rail transport border crossing checkpoints, taking into account the links with countries affected by cholera, and in 22 without international checkpoints ( 2011 — 2015) were used. The analyses of demographic indicators for characterizing intensity and determination the potential epidemic hazard degree of migration was carried out. Results. The increase in population due to interstate migration by various transports was determined in 83,6% subjects. The algorithm of epidemiological assessment was developed, with calculating the potential epidemic hazard degree (PEHD) of population migration in the possibility of cholera importation into 83 administrative subjects. The highest PEHD of migration was determined in 17 of 61 subjects with checkpoint sets; in 39 — higher than normal and in 5 — low; in 22 subjects without international checkpoints — in 8, 12 and 2, respectively. Conclusion. The obtained results indicate the presence of epidemiological risks associated with migration.