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Hungarian Plain (Case study about the risk of sewage thermal water seepage on soil medium). Carpathian Journal of Earth and Environmental Sciences. 6. (1) 229–240. Balog K., Farsang A. & Czinkota I., 2011b. A használt hévíz

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Central European Geology
Authors: Imre Czinkota, János Szanyi, Balázs Kovács, András Sebők, Ildikó Hajdok, and Márton Papp

This paper aims at determining the behavior of thermal water brought to surface and how this might impact reinjection wells and the rock during reinjection. The biggest problem is that reinjection wells are predisposed to choking. We searched for a method to examine this process, including a model for physico-chemical changes in the water—rock interaction. Two different samples of powdered rock (designated α and β) were analyzed using thermal water samples from production and reinjection wells. The pH shows significant differences between the samples from wells where free water treatment was carried out, and those from the aerated thermal waters, as well as for the rock sample. Basically, a decrease in sediment volume can be obtained by increasing the pH. The salt effect was more coherent. Its result was an interesting case of W-shaped graphs from the producing well. On the other hand there is virtually no difference between the samples with acid titration.

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Geothermal energy is the most economical of the green energy resources such as solar or wind. It is a ‘base-load’ type of power, which is constantly available, not just when the sun shines or the wind blows. In Hungary, geothermal energy has proven to be an economical source of energy for direct use. A significant amount of geothermal energy is located throughout Hungary and thermal water (> 30 °C) can be found over 70% of the area of the country. This is supplied mainly from two principal aquifer systems of regional extent. One of them is the clastic Upper Pannonian Quaternary fill of the Pannonian basin, and the other one is the fractured and/or karstified Mesozoic basement. The geothermal situation in Hungary offers two directions for the utilization of geothermal energy. Using the heat from shallow geological sections for heating and cooling buildings; and using thermal sources of low enthalpy thermal waters in several ways (heating and sanitary waters in buildings, greenhouses and aquaculture installations). The potential of geothermal resources and their immediate development should focus on cascade and integrated utilization of geothermal energy. Cascade schemes should be used to fulfil the thermal energy demand for the selected area in order to get the maximum benefit from geothermal energy with the minimum energy demand from heat pumps. The integrated scheme has environmental benefits by using renewable energies (geothermal energy and solar energy), new technologies (heat pumps) and energy savings (cascade scheme). In the long-run, the economic benefits of geothermal power may even exceed those of the fossil fuels. It would likely prove to be a sustainable low-cost source of power. Exploitation of geothermal energy will have a direct impact on the development of the regions, by increasing per capita income and at the same time raising the inhabitants’ standard of living.

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Abstract  

The original purpose of this investigation started in 1996 was to study the radiological impact on the local population of the village of Chichiviriche de La Costa. But, soon after the major earthquake (Ms=6.8) in the state of Sucre on July 9, 1997, the objective was changed to study the fluctuation of radon (222Rn) to see if it could be correlated to seismic activity and/or if the amonlous change just before the earthquake can be considered a precusor for it. Measurements of222Rn by simply de-gassing about 250 ml of natural thermal water employing a Pylon AB-5 radiation monitor and counting the radiation after it reached equilibrium were performed. The values for four sampling periods in the first half of 1996 were about 17 Bq/l of222Rn, a month before the earthquake they were less than 15 Bq/l and increased about 70% to 25 Bq/l two days before the seismic event. In about two weeks, they returned to about 18 Bq/l. But, surprisingly, they have gradually increased to about 35 Bq/l, before leveling off at about 27 Bq/l.

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Abstract  

The paper describes the possibility of efficient and safe use of geothermal water at a location in the town of Zagreb. Geothermal water is used exclusively for the purpose of sport and recreation. Due to elevated226Ra concentrations, the raw geothermal water must be used in limited proportions so as to exclude any potential health risk for the pool users. With application of adequate treatment methods, such as intense aeration (226Ra removal efficiency 13.7±3.5%) and filtration of aerated water with high pressure sand filters (removal efficiency 39.5±7.9%), the elevated226Ra content would be maximally reduced. The decrease of radioactivity enables that the proportion of geothermal water would be increased without any health risk, ensuring great cost reduction spent on the warming of pool waters.

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Abstract

In the surroundings of Berekfürdő (Trans-Tisza Region) a significant positive anomaly was observed in the fluid potential field, in the course of a regional-scale hydrogeologic study of the Great Hungarian Plain (Tóth and Almási 2001). It was assumed that the cause of this phenomenon could be the presence of structural elements in an overpressured fluid potential field. The seismic, hydraulic and hydrogeochemical evaluation of the anomaly proved the presence of a complex structure. The results furnish an example for the theoretical model of Matthäi and Roberts (1996). The identified faults, which define the basement high and rise close to the surface, represent direction-dependent control over the fluid flow systems of the Study Area. The detected horizontal barrier fault zones may act as lateral seals of the Tatárülés-Kunmadaras gas field and might ensure the active water pressure of the reservoir system. The junction of the vertically conducting and horizontally sealing fault zones near Berekfürdő represent the southern limit of the prolific hydrocarbon-bearing Szolnok and the identified “extra“ aquifer. The junction of these faults causes intensive water upwelling which was drilled by Pávai-Vajna in 1928. This exploration initiated the development of the Berekfürdő Spa.

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on the Southern Great Hungarian Plain (Case study about the risk of sewage thermal water seepage on soil medium), Carpathian Journal of Earth and Environmental Sciences , Vol. 6, No. 1, 2011, pp. 229

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. 2013 : Hidrodinamikai vizsgálatok a CH, termálvíz és szilárdásvány-bányászatban (Well testing investigation in hydrocarbon, thermal water and mining industry) . — Manuscript , University of Szeged , 86 p. (in Hungarian

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. Alföldi , L. 1982 : A layered thermal-water twin flow system . — Journal of Hydrology , 56 , pp. 99 – 105 . Alföldi , L. , L. Bélteky , T. Böcker , J

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