Groundwater quality of groundwater system of Varaždin : master's thesis

Diplomski rad prikazuje kakvoću podzemne vode na području varaždinskog vodonosnika koji je važan za vodoopskrbu grada Varaždina i okolnih područja. Kakvoća podzemne vode varaždinskog aluvijalnog vodonosnika prati se na lokacijama zdenaca vodoopskrbnog sustava regionalnog vodovoda Varaždin, kao i piezometara u priljevnim područjima crpilišta Varaždin, Bartolovec i Vinokovšćak. Parametri kakvoće koji su detaljno razmatrani u diplomskom radu su: temperatura, pH, elektrovodljivost, oksidativnost, ukupni koliformi, enterokoki, aerobne mezofilne bakterije na 22 °C i 37 °C, Eschericia coli, mutnoća, kloridi, nitriti, nitrati i amonijak. Utvrđene su povišene koncentracije nitrata, nitrita i bakterija. Bakterije su uvijek prisutne u tlu te se uništavaju kloriranjem na vodocrpilištima dok su nitrati i nitriti posljedica antropogenog utjecaja. U ovom slučaju to su: prehrambena industrija, poljoprivreda i ne odgovarajuća odlagališta peradarskih fekalija. U okviru diplomskoga rada razmatrano je i funkcioniranje uređaja za pročišćavanje otpadnih voda, koji služi za pročišćavanje otpadnih voda mješovitog kanalizacijskog sustava grada Varaždina. Na lokaciji uređaja, prije ispuštanja u prirodni recipijent mjere se sljedeći parametri: suspendirana tvar, BPK5, KPK, ukupni fosfor, ukupni dušik, anionski detergenti, pH, masti i ulja, nitrati, fosfati, kloridi, otopljeni kisik, amonijak i sulfati.Abstract: Master's Thesis discusses the quality of the groundwater in the Varaždin aquifier, which is important in the supply of Varaždin and the surrounding areas with water. The quality of groundwater in Varaždin's alluvial aquifier is monitored at the wells of Varaždin's regional watter-suply system, as well as by piezometers in the inflow area of pumping stations in Varaždin, Bartolovec and Vinokovšćak. Quality parameters considered in detail in the thesis are: temperature, pH, electrical conductivity, oxidization, total coliforms, enterococci, aerobic mesophilic bacteria at 22°C and 37°C, Eschericia coli, water turbidity, chlorides, nitrite, nitrate and ammonia. Higher concentrations of nitrite, nitrate and bacteria were detected. Bacteria are always present in soil and are removed by chlorination of water-pumping sites, whilst nitrite and nitrate result from anthropogenic influences. In this case, those are: food industry, agriculture and inadequate disposal of feces from poultry-farming. Also discussed is the functioning of Varaždin's wastewater treatment plant, treating the water from the local sewer system. Before treated water is discharged, the following parameters are measured: suspended solids, BOD 5, COD, total phosphorous, total nitrogen, anionic detergents, pH, oils and lipids, nitrates, phosphates, cholrides, dissolved oxygen, ammonia and sulfates