Water represents a standard civilization norm of the time and society which we manage and in which we live. Following the vision of the 21st century, when water will become the basis of the world’s business and political scene, we have built a modern biological waste water treatment plant in the town of Koprivnica.
A well organized and regulated treatment of waste water implies: collection and drainage of waste water through a drainage system, efficient treatment before discharging into the recipient within the legal quality standard and setting an example of responsible management and comprehensive use of water.
The main purpose of the waste water treatment plant is to treat water until it is safe to be discharged without worsening or endangering the natural state of the environment.
The beginning of the sewage system construction dates back to the early 1960s. In the town of Koprivnica and its suburbs, more than 95% of the system has been constructed to date. Currently, the system is 202 kilometers long. The sewage system is mostly mixed-type, which means that both fecal and rain water is drained though the same system. All accumulated waste water is drained through the main collector heading north-east from the town to the village of Herešin where, after being treated, it is discharged into a natural recipient Moždanski Jarak, until it reaches a stream, the Bistra, and eventually the river Drava. Until 1989 waste water was discharged without being treated. In the same year a pre-treatment plant was built, but its technology and treatment capacity was far from the satisfactory quality of waste water. This quality can only be achieved by using technology which includes preliminary, primary, secondary and tertiary level of treatment.
The Agreement of the construction of the waste water treatment plant of the town of Koprivnica by the international FIDIC norms was signed on 25 August 2005 with the main contractor Astra International Inc. Zagreb on a turn-key basis. The construction of the plant began in August 2006 and was finished in June 2007. Its capacity is 100 000 Equivalent persons (EP) and it runs on the basis of SBR technology (sequencing batch reactor). SBR represents a discontinued process of the biological treatment of waste water, where different phases of the treatment process alternate within one reactor.
In compliance with the principles of European Water Charter (Strassbourg, 6 May 1968):
“When used water is returned to a common source it must not impair the further uses both public and private”, we will contribute towards sustainable development and protection of the environment of Koprivnica and its surroundings