Sustainability Report 2010 Lek d.d.

45 Active Environmental Policy formed at the Menge‰ site, the reason for their presence in wastewater being residual inorganic substances. As the annual amounts of phosphorus and nitrogen com- pounds are reported after the treatment in the wastewater treatment plant, they largely depend on the efficiency of the wastewater treatment. The levels of pollution due to chemi- cal oxygen demand are measured at the point of discharge of waste cooling waters into the water stream, and at the point of discharge of industrial wastewater into the treatment plant collector. Wastewaters and the content of all three pa- rameters are regularly monitored by the respective monitor- ing authorities. Monitoring is performed three to six times per year, depending on the site’s wastewater volume. 59 POR OI15 60 POR OI16 61 POR OI14 Other environmental impacts Odor At all the sites, biofilters have been installed wherever odor is expected in the air (above the flotation tanks). In this way, the odor resulting from the industrial process is prevented from affecting the local population. As Slovenia’s environ- mental regulations do not cover environmental odor loads, the requirements for odor load reduction were not integrated in the environmental permitting procedure. The monitoring of biofilters’ operation and waste air loads is carried out by the Public Health Institute Maribor. In 2010, Lek received no odor-related complaints. Graph 17: Chemical oxygen demand (in t of O 2 ) 61 2006 2007 2008 2009 0 60 120 180 240 2010 221,7 143,3 119,8 144,8 138,0 t Graph 15: Phosphorus compound emissions 59 2006 2007 2008 2009 0 1 2 3 4 2010 4,7 2,6 4,1 3,3 2,4 t 5 Graph 16: Nitrogen compound emissions 60 2006 2007 2008 2009 0 7 14 21 28 2010 34,0 24,5 20,3 27,7 24,5 t 35 * The blue line indicates the trend between 2006 and 2010 * The blue line indicates the trend between 2006 and 2010 * The blue line indicates the trend between 2006 and 2010