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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 118 % since 2002 or from 38 million m3 (in 2002) to almoust 46 million m3 (in 2018). There were almost no tertiary wastewater treatment processes in Slovenia in 2002, and in 2018, 72% of wastewater or 116 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, Environmental Agency of the Republic of Slovenia, 2020; Statistical Office of the Republic of Slovenia, 2020

Show data
primary[%] secondary[%] tertiary[%] primary[number] secondary[number] tertiary[number] population - total[number]
1998 27.51 11.42 1.47 545399 226341 29079 1982603
1999 25.02 13.73 1.94 497575 273098 38623 1988887
2000 26.73 11.85 1.88 531953 235893 37446 1990272
2001 24.18 15.99 1.40 481660 318592 27810 1992035
2002 21.96 19.14 1.38 438320 382055 27624 1995718
2003 21.96 19.92 1.50 438513 397844 29911 1996773
2004 20.94 23.10 8.74 418112 461325 174564 1997004
2005 19.61 22.53 12.31 392319 450909 246364 2001114
2006 3.85 39.65 12.34 77375 796417.80 247859 2008516
2007 3.79 39.92 12.71 76632 806153 256639 2019406
2008 1.31 41.27 13.81 26580 834764.60 279240 2022629
2009 0.45 39.62 16.76 9264 809213.60 342343 2042335
2010 0.46 40.08 17.47 9506 821363.80 357965 2049261
2011 0.46 40.25 18.48 9350 826115.80 379269 2052496
2012 0.46 38.60 20.13 9395 793812 413943 2056262
2013 0.45 36.38 23.33 9350 749046.40 480481 2059114
2014 0.45 34.96 24.93 9264 720785.20 513871 2061623
2015 0 31.97 28.32 0 659550.60 584218 2063077
2016 0 29.93 35.69 0 617828.80 736723 2064241
2017 0 24.94 43.32 0 515371.20 894973 2066161
2018 0 24.21 44.08 0 501070 912468 2070050
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, Environmental Agency of the Republic of Slovenia, 2020

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 48409.01 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 82297.41 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 104801.83
2018 0 45550.41 116458.40

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 for the period 2005-2017.
  • 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
31.03.2020
Author(s)

Marjan Zajc, Agencija Republike Slovenije za okolje