The present paper deals with the wastewater pond accident in Nagybánya (Romania) in 2000 of which the result was an about 100 tons of highly toxic cyanide spill into the River Tisza. Measurements and laboratory tests were performed during the toxic wave transport. On the basis of this data set mass balance calculations were performed by hydraulic and transport models to investigate and better understand the effect of the accident and to calculate the possible heavy metal sedimentation process in Tisza River bed. This paper deals with calculations for cyanide and copper which are mostly associated to cyanide pollution.

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