GHEORGHE ROMANESCU, ALINA TIRNOVAN, ION SANDU, GIANINA MARIA COJOC, IULIANA GABRIELA BREABAN, ALIN MIHU-PINTILIE<br>Water Chemism Within the Settling Pond of Valea Straja and the Quality of the Suha Water Body (Eastern Carpathians)

GHEORGHE ROMANESCU, ALINA TIRNOVAN, ION SANDU, GIANINA MARIA COJOC, IULIANA GABRIELA BREABAN, ALIN MIHU-PINTILIE
Water Chemism Within the Settling Pond of Valea Straja and the Quality of the Suha Water Body (Eastern Carpathians)

Abstract:

The settling pond of Valea Straja is part of the Lesu Ursului-U.P Tarnita mining complex for copper and barite exploitation. It functioned as settling pond for tailings and mechanical treatment in the period 1989-2006. The settling pond comprises many polluting elements: xanates, AGF 250, copper sulphate, lime, sodium cyanide, sodium hypochlorite, chlorinated lime, sodium silicate, active charcoal, sodium sulphate, etc. The amount of precipitations has increased in the past years; in this sense, it is worth underscoring the heavy rains usually recorded during the warm period of the year. Huge discharges may lead to dam breaking or to the overflowing of polluted water. The maximum value of precipitations and the maximum equivalent discharge that can be taken over by spillway pipes are calculated. Pollutant elements risk getting into the hydrographical network downstream (affecting almost the entire Suha catchment), which supplies the riparian localities. Currently, almost all the physico-chemical parameters of the Suha River water - in the Ostra section, downstream from the settling pond - classify it as class II quality. Keywords: catchment, major risk, pollution, mining exploitation, settling pond

Issue: 2015, Volume 66, Issue 10

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