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(M/MF168) Risk analyses of groundwater pollution in industrial areas. Galchenko, Sergey1, 1 ABSTRACT- The problem of groundwater pollution in areas of groundwater overexploitation is very important all over the world. In Central Germany coal mining has caused significant changes to the ecological situation. After coal (lignite) exploitation many mining lakes have formed by ascending groundwater. The oxidation of pyrite in the dump sediments and the mobilisation of the oxidation products by rain and groundwater lead to acidification of these lakes. These lakes with pH-values of about 3 can be used neither as drinking water reservoirs nor for recreation activities. The biological diversity is invited too due to unfavourable conditions. Sulfuric acid attacks and destroy carbonates and clay minerals, and mobilises their metal content. It leads to increase of heavy metal concentration in groundwater and consequently to the negative influence to human health and biota. Groundwater as well as surrounding sediments are modelled by MODFLOW and MT3D computer programs. They describe both the hydrodynamic processes and the chemical development of the objects in consideraration. The ecological reactions included in these transport models are equalibrium-controlled linear and non-linear adsorbtion and first-order irreversible reaction (biodegradation). The purpose of this investigation is to determine the possibility of remediation of industrial landscapes in this region and comparison of different approaches for it. Key words: risk, groundwater, pollution, modelling |
