The indicator shows the annual quantity of sludge from wastewater treatment plants in Slovenia and ways of sludge treatment.
Sludge from wastewater treatment plants is defined as waste material that is a by-product of wastewater purification in wastewater treatment plants or remains after emptying domestic wastewater cesspools.
The treatment of this kind of waste is governed by the Decree on waste management (Official Gazette of the Republic of Slovenia, nos. 34/08), and the input of this waste in soil and agricultural surfaces is governed by the Decree on the limit input concentration values of dangerous substances and fertilisers in soil. Special requirements regarding the emission of substances in wastewater discharged from urban wastewater treatment plants are defined in the Decree on the emission of substances in wastewater discharged from urban wastewater treatment plants.
Waste Water Treatment Plants Database, Environmental Agency of the Republic of Slovenia, 2007
|production of sewage sludge||1000 t of dry matter||8.8||8.2||7||8.8||12.9||16.9||20.1|
|use in agriculture||1000 t of dry matter||0.3||0.5||1.1||0.5||0.1||0.1||0|
|composting||1000 t of dry matter||1||0.9||0.9||0||0||0.1||0|
|landfill of waste||1000 t of dry matter||7.5||6.8||5||7||9||9.5||9.2|
|other||1000 t of dry matter||np||np||np||1.4||3.7||7.2||5.6|
|1000 t of dry matter||np||np||np||np||np||np||5.2|
Biologically recover of sludge at appropriate plants, especially at Regional waste management centres, and particularly those types of sludge that are less contaminated with heavy metals or not at all.
To ensure sufficient facilities for thermal treatment of waste, where up to 70,000 t of sludge from wastewater plants drained to 30% of dry matter can be recovered.
The data on quantities of excess sludge from urban and combined wastewater treatment plants were gathered from the reports on operational monitoring of urban and combined wastewater treatment plants. The obligation to carry out the monitoring and submit reports is defined in Article 27 of the Decree on the emission of substances and heat in the discharge of wastewater into waters and public sewage system (Official Gazette of the Republic of Slovenia, no. 47/05). The form of monitoring is defined in the Rules on initial measurements and operational monitoring of waste water and on conditions for their implementation (Official Gazette of the Republic of Slovenia, nos. 35/96, 29/00, 106/01). The data are collected in written and electronic form and than processed in the Urban and combined wastewater treatment plant database at the Environmental Agency of the Republic of Slovenia.