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The effects of uninsulated sewage tanks on groundwater. A case study in an eastern Hungarian settlement

Mester T., Szabo G., Bessenyei E., Karancsi G., Barkoczi N., Balla D.

Journal of Water and Land Development

2017

no. 33

123--129

In our study we attempt to demonstrate the effects of uninsulated sewage tanks, which are the most important sources of contamination in settlements without sewage systems, on groundwater quality. We compared the results of measurements carried out before and one and a half years after the construction of the sewage system. We established 3 m deep monitoring wells within a 25 m radius of a sewage tank, which were then sampled, and the level of groundwater was recorded. The 3D model constructed on the basis of the saturated zone shows that the effluent wastewater formed a groundwater level dome with a height of more than 1 m. After the sewage tank was taken out of use the difference between the highest and lowest groundwater levels decreased to a few centimetres. In our study we investigated the spatial distribution of NH4 + (ammonium). Using the 3D model we were able to precisely determine the volume of water bodies with different levels of contamination. In an approximately 25 m3 water body, in the immediate environment of a sewage tank in use we detected NH4 + at a concentration which was characteristic of undiluted wastewater (>90 mg∙dm–3). After the sewage tank was taken out of use, the concentration in its immediate environment decreased by more than 50%, although almost everywhere in the modelled area concentrations were measured above the limit value. Based on the above, we can conclude that the cleaning process has started, but the complete decontamination of the groundwater will take several years.

W pracy podjęto próbę wykazania wpływów nieizolowanych zbiorników ściekowych, które są głównym źródłem zanieczyszczenia w osiedlach pozbawionych kanalizacji, na jakość wód gruntowych. Porównano wyniki pomiarów prowadzonych przed i półtora roku po zbudowaniu systemu kanalizacyjnego. W promieniu 25 m od zbiornika ściekowego zainstalowano studzienki o głębokości 3 m, z których pobierano próbki i mierzono w nich poziom wód gruntowych. Na podstawie trójwymiarowego modelu zbudowanego ze znajomością strefy saturacji stwierdzono, że wypływające ścieki uformowały wypukłe zwierciadło wód gruntowych o wysokości ponad 1 m. Po wyłączeniu zbiornika ścieków z eksploatacji różnica pomiędzy najwyższym i najniższym poziomem wód gruntowych zmalała do kilku centymetrów. W przedstawionych badaniach analizowano przestrzenne rozmieszczenie jonów amonowych (NH4 +). Stosując trójwymiarowy model można było precyzyjnie określić objętość wody o różnym stopniu zanieczyszczenia. W 25 m3 wody w bezpośrednim otoczeniu używanego zbiornika ściekowego wykryto jony amonowe w stężeniu typowym dla nierozcieńczonych ścieków (>90 mg∙dm–3). Po wyłączeniu zbiornika z eksploatacji stężenie to zmalało o ponad 50%, choć niemal wszędzie nadal przekraczało dopuszczalne normy. Na podstawie uzyskanych wyników można wnioskować, że proces oczyszczania został rozpoczęty, ale całkowita dekontaminacja zajmie kilka lat.

"Red book" of the Hungarian landscapes atlas of the threaths on the natural functioning of the 229 Hungarian microregions

Csorba P., Szabo J., Bodnar R., Szilagyi Z., Szabo G., Szabo S., Novak T., Fazekas I.

Prace Komisji Krajobrazu Kulturowego

2008

nr 8

43--60

For the good established landscape planning landscape protection and landscape management actions have to take into consideration the actual conditions of the landscape elements. Earlier we dealt with the stability of the landscapes (Kerényi, Csorba, 1996), recently started to investigate the most important factors, which are endangers the proper functioning of the landscapes. Results are calculated for 229 microregions of the country, which are elements of the official landscape hierarchy of Hungary described in the Cadastral of Microregions of Hungary. The average size of the microregions are 100-500 km2. There are certain factors among which some have already elaborated, and others are being worked on yet. Degree of ecological fragmentation of the microregions by roads, railway lines and settlements was determined during the last year. In the case of large settlements the extent of inner parts, traffic intensities of the roads was taken into account, while in the case of railroads it was taken into consideration whether railway lines are single or double tracked. Results were purified using a weighting, where the location of the protected natural areas compared to the situation of the given settlement, roads or railroads was taken into consideration. In the calculations it was taken into account as well that the agglomeration processes of the large settlements may restrict the ecological gates and corridors of the migration of plant and animal species. From the series of maps on natural threats on microregional level, the map of the hazards of drought is presented first. The map gives a definite answer to the question, in which microregions is profitable to establish irrigation systems; and how high is the uncertainty of the rate of their utilization. Global warming, however, may modulate the map resented here remarkably in the next decades. Microregions that have been classified into transition categories with moderate or medium level of drought hazard may fall into categories of serious hazard of drought in the future. A synthesizing map has been completed by summing the seven datasets of the indicator group of natural hazards and the weighting of the subsets. Landscape planning is strongly affected by tendencies of macro economy on the present land use structure. EU agricultural policies have just started to affect strongly on Hungarian land use structure, therefore attempts have been made in order to forecast their impacts. Present Hungarian land use structure has been compared to priorities of the EU. Prospective shifts in land use structure have been determined for the 35 regions of Hungary. According to the 8-10 factors mentioned above, we shall have a detailed database to evaluate the microregions of Hungary in order to characterize the most threatened landscapes, and the most dangerous impacts on the landscape functioning.

Environmental impacts of an opencast mine

Szabo G., Braun M., Koi R., Szabo S., Szegedi S.

Prace Komisji Krajobrazu Kulturowego

2008

nr 8

113--126

An opencast mine may cause negative effects in many ways. Landscape scarrings of opencast mines are harmful in aesthetic respect, engines, machineries and periodic blastings may cause notable noise loading which are injurious even if these mines are situated far from the settlements because the noise from the mines may disturb animals living in the surrounds (Kerényi, 1995, 2003, Barótfi, 2000). Besides the listed impacts the dust accompanied to the opencast mining cause the most significant load to the environment of these mines. In this study, the extent of dust loading is examined in the case of a North-Hungarian perlite mine. Milling of the exploited perlite is carried out in the milling plant located within the area of the mine in Pálháza which cause additional dust loading. Settling dust loading was studied by 22 measurement stations within a distance of 3 kilometres from the mine, during the installation of which even cover of the study area was aimed. Gathering of the dust samples were carried out monthly from August 2004 to July 2006 thus we have a two-year database. During the laboratory tests, the amount of insoluble and soluble dust fractions, altogether making up the total amount of settled dust, was determined respectively. In addition to the meteorological parameters having the most influence on the spatial distribution of the settling dust (i.e. wind velocity, wind directions and the amount of precipitation, air temperature, humidity and irradia-tion) that is why an automatic meteorological station was installed in the proximity of the mine, i.e. within the study area. It gave us the necessary meteorolo-gical data during the examination. Knowing that the most significant dust loading derives from the opencast mine we can not forget that periodically during the agricultural seasons from the arable lands and during the heating seasons through the chimneys additional dust might get into the dust-traps. To determine the origin of the dust in each dust-trap the dust samples were analytical examined as well. By the chemical composition of the samples we could find out how big roles the pollution sources outside the opencast mine played and hereby we could detect how significant the dust loading originated from the perlite mine is in its environment.