Wastewater Treatment in Town of Koprivnica

Početkom 21. stoljeća počela se razvijati svijest o nužnosti pročišćavanja otpadnih voda, neovisno potječu li otpadne vode iz kućanstva, industrije ili su nastale padalinama i ispiranjem poljoprivrednih i drugih površina. Izgradnja uređaja za pročišćavanje otpadnih voda je sve češća i pročišćavanje otpadnih voda prije ispuštanja u okoliš postaje imperativ. Grad Koprivnica administrativno je i industrijsko središte Koprivničko-križevačke županije. U svrhu zaštite prirode i očuvanja ljudskog zdravlja izgrađen je uređaj za pročišćavanje otpadnih voda grada Koprivnice. Uređaj otpadnu vodu prerađuje biološkim postupkom i među rijetkim je procesima obrade otpadne vode u Hrvatskoj koji posjeduje i tzv. „treći stupanj“ obrade otpadne vode, odnosno učinkovito uklanja nutrijente iz otpadne vode. Počeci izgradnje sustava javne odvodnje u Koprivnici sežu u rane šezdesete godine prošlog stoljeća. Do 1989. godine otpadna voda je ispuštana bez ikakvog pročišćavanja, a potok Bistra, recipijent otpadnih voda Koprivnice, bio je uslijed toga značajno onečišćen i ispod propisane kategorije kakvoće vode. Sustav javne odvodnje grada Koprivnice pretežno je mješovitog tipa, što znači da se fekalne i oborinske vode odvode istim sustavom. Sva prikupljena otpadna voda odvodi se glavnim kolektorom, a nakon pročišćavanja ispušta se u recipijent Moždanski jarak kojim teče do potoka Bistra i njime u rijeku Dravu. Zadatak završnog rada je opisati uređaj za pročišćavanje otpadnih voda Koprivnice.At the beginning of the 21st century, awareness was raised about the need for wastewater treatment, irrespective of the drainage of wastewater from household, industry or emerging precipitation, and washing of agricultural and other surfaces. The construction of wastewater treatment plants is more and more common, and wastewater treatment prior to release into the environment becomes imperative. Koprivnica-Križevci County is the administrative and industrial center of Koprivnica. For the purpose of nature protection and the preservation of human health, a wastewater treatment plant was built for town Koprivnica. The wastewater treatment plant is processed by biological process and it's among the rare wastewater treatment processes in Croatia which possesses so-called "Third level" treats waste water, effectively removing nutrients from waste water. The beginnings of the construction of a public drainage system in Koprivnica arise in the early seventies of the last century. Until 1989 waste water was discharged without any purification, the Bistra stream, Koprivnica's primitive waste water, was therefore well cleansed and below the prescribed water quality categories. The Koprivnica public drainage system is predominantly a mixed type, meaning that faecal and precipitation waters are run by the same system. All wastewater collected is taken to the main collector, and after the renovation it is discharged in the back of the Moždanski jarak that leads to the Bistra stream and the river Drava. The task of this work is to describe Koprivnica wastewater treatment plant