Mila Trayanova

• Master of Science
• PhD Student at Bulgarian Academy of Sciences

Bulgaria is rich in sources of mineral water of temperatures in the range of 25 °C–100 °C and various chemical compositions due to diverse geological and hydrogeological conditions. A large portion of the reservoirs of low-mineralisation water is suitable for bottling. Most of them are situated in Southern Bulgaria and related to fractured hydrothe...

Radon (222Rn) is a radioactive gas and formed as a result of the radioactive decay of radium. 222Rn relieved from the ground could accumulate in the building and contribute to human exposure. Exposure to indoor radon and its decay products contributes to half of the annual dose received by the public from all natural radioactive sources. Radon is r...

Radon gas has high mobility and is driven by advection and diffusion with the soil gas throughout connected and water-unsaturated pores and/or cracks in permeable rocks and soils. Therefore, there is a need for quantitative assessment of the saturation state, even on a daily-base in order to estimate the radon potential correctly. The more so as, t...

Natural radon (222Rn) is a radioactive noble gas that occurs in every rock or soil due to the content of radium (226Ra), part of the 238U family, in the lithosphere. One of the indicators for evaluating the impact of radon on a certain area/terrain, including on the biota, is the so-called geogenic radon potential. Different types of rocks and soil...

The artesian borehole R-30–Staro Oryahovo with total depth of 1740 m gives waters of chlorine–sodium type with a mineralization of 31 g/L from formations of Paleogene age. These waters contain high concentrations of iron and because of this, intense precipitation of iron compounds takes place at and around the wellhead. To clarify the ongoing proce...

The purpose of the present study is to evaluate the environmental impact of a surface spill of groundwater with high total dissolved solids content by clarifying the extent of contamination in the soil layer near the borehole R1 – Barzina. The overall tendency for limitation of the migration of chloride pollution in the immediate vicinity of the fo...

Natural radon (222Rn) is a radioactive noble gas that occurs in every rock or soil due to the content of radium (226Ra), part of the 238U family, in the lithosphere. Different types of rocks and soils possess different 226Ra content and different permeability. Radon has high mobility and is driven by diffusion and convection with the soil gas throu...

The Archar-Orsoya lowland is situated in the Danube floodplain west of the town of Lom, NW Bulgaria. It is aligned in a west-east direction along the Danube River and to the south it is bounded by a high landslide slope, built of Pliocene clays and sands. Parallel to the shore, sand dunes are formed with lowered sections between them, in which ther...

INTRODUCTION The radon gas relieved from ground could accumulate in the building and contribute to human exposure. Exposure to indoor radon and its decay products contributes half of the annual dose received by the public from all natural radioactive sources [1]. Radon is recognized as a carcinogenic agent by the WHO and is the second leading cause...

Natural radon (222Rn) is a radioactive noble gas that occurs as the immediate decay product of radium (226Ra), part of the 238U family, in the lithosphere. Radon is driven by advection and diffusion with soil gas throughout connected and water-unsaturated pores and/or cracks in permeable rocks and soils. The aim of the present study is to do a revi...

Analysis of the research activities in Bulgaria related to evaluation of the degree of water saturation in the near-surface layer in connection with the assessment of the radon potential Анализ на изследванията в България, свързани с оценка на степента на водонасищане на приповърхностния слой във връзка с оценка на радоновия потенциал

The preliminary data show that the all studied waters in the area of the Grantcharitsa deposit (surface, mine and underground) are low mineralized. It was found that W, As and U as critical chemical elements for the local inhabitants, occur in the waters of the Grantcharitsa River in low concentrations (U) or their contents are below the detection...

The chemical composition of thermal waters has an important role in their use as a shallow geothemal source. One of the chemical components that may have a negative impact is iron. Its presence in the water can lead to both chemical and biocorrosion, as well as filling of the wells and facilities associated with the use of thermal waters. The aim o...

“Shipkovo” thermal water field is one of the few in the country formed in karstified carbonate rocks. Initially, there was a natural spring with elevated temperature, located at the boundary of Triassic karstified limestones and dolomites and Lower Cretaceous terrigenous rocks, sinking in depth to the east. Later, drilling operations were carried o...

The Dobrudzha Coal Deposit is characterized by complex geological, tectonic and hydrogeological conditions. The formed aquifers and complexes, on the one hand, hinder the possible exploitation of the coal deposit, on the other hand they are important for drinking water supply in the area. The aim of the present study is to develop a 3D hydrodynamic...

The Velingrad geothermal field is one of the largest in Bulgaria. Its water is widely used for balneo­ logy, spa tourism, sports, heating and other purposes. An interesting problem related with the operation of ther­ mal water is the process of scaling or corrosion of equipment when the water passes through it. Specifically, for the geothermal fiel...

The area of Kamchiya River's inflow into the Black Sea has an important role not only as a natural landmark, but also as a leading factor for the national economy. It has been subjected for many years to oil and gas exploration, as well as to extraction of deep, highly mineralized waters containing chemical elements of industrial value. There are c...

The Arda River is the main river course in the mountain range Rhodopes located in Southern Bulgaria. Its river basin is characterized by highly variable relief and diversified geological and hydrogeological conditions. The groundwater is recharged mostly from precipitation and forms baseflow of the Arda River and its tributaries. The aim of the stu...

In the recent years there has been a steady increase in the concentrations of arsenic in the Kobilyak karst spring. After a complex research, the Ogosta River was found to be the source of pollution, and the reason is the accelerated lateral and bottom erosion of the river, which relieves the infiltration of river waters into the karst limestones a...

The soil-cement cushion represents a compacted and stabilized layer of the soil base, built under the foundation, which is intended to replace a part of the collapsible layer, to increase the bearing capacity of the soil base and/or to play a role of engineering barrier against migration of harmful substances in the geoenvironment. The soil-cement...