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The idea of constructing a treatment plant for wastewater of the areas of the then municipalities of Domžale and Kamnik goes back to 1975, when in July a document titled »A Study of industrial wastewater of the towns of Domžale, Kamnik, and Mengeš« was drawn up for this purpose by the Institute for Waters of the Republic of Slovenia. Due to its developed and diverse industry, the area of Domžale-Kamnik was already at that time one of the potentially most polluted areas in Slovenia. However, the result of the care and efforts of our forerunners in the field of river protection led to the beginning of the construction of the Central wasterwater treatment plant of Domžale – Kamnik in 1975. The construction itself was funded not only by the state, but also the biggest water polluters in the area, the current municipalities of Domžale and Kamnik as the then municipalities of Domžale and Kamnik, and the owners of the Central wastewater treatment plant of Domžale-Kamnik (hereafter referred to as the CČN).


The current workload of the CČN, treating municipal wastewater, rainwater and industrial wastewater from the areas of the municipalities of Domžale, Kamnik, Mengeš, Komenda, Cerklje na Gorenjskem and Trzin, ranks this plant the fourth biggest municipal wastewater treatment plant in operation in the Republic of Slovenia. Our treatment plant is of conventional type and is responsible for the removal of carbon from wastewater. The plant is a classic, two-stage, mechanical-biological wastewater treatment plant with anaerobic digestion and biogas use in its biogas engines. The process is finished with the treated wastewater released into Kamniška Bistrica, a mountain river with fast current which flows into the Sava river.

 

Development of the CČN Domžale-Kamnik in chronological order:  
construction of the sewer network 1972–1975
construction of the treatment plant 1975–1980
launch of CČN (without anaerobic digestion and sludge dumping ground) 1981
modernization of the plant 1981–2000
construction of the wastewater dehydration system 1986
biogas engines 1987
depot 1989
digestion plants for stage II 1991
transformer substation 1993
power supply building 1993
new gasholder 1997
facility A - skimmers 1990
change of the ventilation system 1999
mechanical level of treatment: sludge skimming optimization 1999
old digestion plants, capacity expansion in the heating system 1999–2000
sanitation of the primary sediment tank 2003–2004
change of biogas engines 2004
upgrade of CČN 2014–2017

 

With the addition of processes for the removal of carbon and phosphorus, as well as with the increased wastewater inflow capacity of the plant, the CČN was upgraded, representing a model of the current state-of-the-art technique in wastewater treatment in the world.


This upgrade allows additional wastewater reception from the areas where the sewer system is still in works, more precisely from the current reception municipalities as well as from the municipality of Cerklje na Gorenjskem. The upgrade of CČN is by all means bound to lower substantially the levels of organic material in Kamniška Bistrica, including less carbon and phosphorus content, which shall effect positively both chemical and biological conditions of the river.

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