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[VD02] Wastewater treatment
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Key message
Neutral

In recent years, the amount of wastewater treated by secondary or tertiary treatment processes increased, while primary treatment processes have closed. The amount of wastewater treated through secondary treatment processes increased by 150 % since 2000 or from 30 million m3 (in 2000) to almoust 45 million m3 (in 2019). There were almost no tertiary wastewater treatment processes in Slovenia in 2000, and in 2019, 72% of wastewater or 113 million m3 of wastewater was treated by tertiary process.

This indicator shows the quantity of industrial and municipal/urban wastewater and the share of population whose wastewater is treated in municipal/urban and combined wastewater treatment plants classified according to the level of treatment under the methodology determined in the Urban Waste Water Treatment Directive. This methodology was also adopted in the Slovenian Decree on the Emission of Substances in Waste Water Discharged from Urban Waste Water Treatment Plants (OJ RS No 35/96, 90/98, 31/01, 62/01, 41/2004-ZVO-1). In general terms, primary treatment is mechanical and/or chemical. It includes removal of settleable organic and inorganic solids by sedimentation and removal of materials that float (scum) by skimming. Secondary treatment is biological. It removes most organic matter and 20–30% of nutrients. Tertiary treatment removes (apart from organic matter) most nutrients (nitrogen, phosphorus).

Charts

Figure VD02-1: Share of Slovenian population whose urban waste water was treated, in individual years, in urban or common waste water treatment plants of a certain treatment level
Sources:

Waste Water Treatment Plants Database, Slovenian Environment Agency, 2020; Statistical Office of the Republic of Slovenia, 2021 (26. 03. 2021)

Show data
primary[%] secondary[%] tertiary[%] primary[number] secondary[number] tertiary[number] population - total[number]
1998 27.60 11.29 1.48 547253 223824 29329 1982603
1999 25.11 13.60 1.95 499358 270588 38832 1988887
2000 26.66 11.88 1.89 530682 236410 37656 1990272
2001 24.07 16.04 1.42 479455 319620 28289 1992035
2002 21.95 18.97 1.40 437976.60 378491 27982 1995718
2003 21.92 19.74 1.53 437652.80 394206 30489 1996773
2004 21.04 22.65 8.88 420195.80 452372 177409 1997004
2005 19.69 22.32 12.13 394063 446719 242719 2001114
2006 3.90 39.52 12.15 78431 793732.60 244043 2008516
2007 3.85 39.94 12.35 77688 806478.80 249462 2019406
2008 1.31 41.29 13.49 26580 835204.40 272897 2022629
2009 0.45 39.70 16.38 9264 810742.40 334616 2042335
2010 0.46 40.19 17.12 9506 823564.60 350834 2049261
2011 0.46 40.28 18.21 9350 826681.60 373818 2052496
2012 0.46 38.32 20.10 9403 787858.40 413382 2056262
2013 0.45 36.12 23.34 9350 743798.20 480557 2059114
2014 0.45 34.70 24.94 9264 715447 514199 2061623
2015 0 31.71 28.31 0 654286.60 584012 2063077
2016 0 28.56 33.51 0 589516 691651 2064241
2017 0 24.01 41.99 0 496167 867638 2066161
2018 0 23.71 43.51 0 490785 900739 2070050
2019 0 23.87 43.64 0 498795 911810 2089310
Figure VD02-2: Quantity of waste water treated in urban or common waste water treatment plants of a certain treatment level
Sources:

Waste Water Treatment Plants Database, , Slovenian Environment Agency, 2021 (26. 03. 2021)

Show data
primary[1000 m3] secondary[1000 m3] tertiary[1000 m3]
1998 66151.33 25620.20 2801.33
1999 62145.95 33223.48 4308.74
2000 68076.81 30131.58 3370.87
2001 55558.45 33590.20 3092.81
2002 57903.69 38674.66 2748
2003 46980.96 38484.78 2633.08
2004 43996.79 48404.51 12744.28
2005 48536.02 45641.87 26656.19
2006 8779.24 72965.49 27932.59
2007 8035.17 77945.41 27209.49
2008 4560.30 90994.02 30693.96
2009 466.81 90124.35 41063.11
2010 457.62 98010.39 47192.61
2011 450.00 76962.45 42545.15
2012 433.37 82198.59 48225.55
2013 446.50 84355.51 65568.32
2014 434.50 78101.52 78043.75
2015 0 59527.85 73587.24
2016 0 57034.60 92501.12
2017 0 45311.92 104983.01
2018 0 46292.84 115767.27
2019 0 45054.14 113137.87

Goals

  • To ensure protection of all surface and groundwater bodies on the territory of the Republic of Slovenia from organic pollution, nitrogen and phosphorus input and microbiological pollution.
  • To construct municipal wastewater treatment plants and sewer networks for all agglomerations specified in the Operational programme for the discharge and treatment of urban wastewater.
  • To insure proper collection, discharge and treatment of urban wastewater by the end of 2021 with construction of small treatment plants for individual buildings in sensitive areas and by the end of 2030 in all other areas.

 

 

Methodology

Date of data source summarization
Last modified
26.03.2021
Author(s)

Marjan Zajc, Slovenian Environment Agency