ESTABLISHING THE PARAMETERS OF POLLUTION WASTE WATER ON THE CITY CLEANER VELIKA GORICA 2012/2013.

Sustav za pročišćavanje otpadnih voda je ispravan način kako čovjek treba odgovorno postupati prema vodi uzetoj iz prirode te njenom vraćanju u istu. Vodu valja pročistiti do tog stupnja da njenim ponovnim vraćanjem ne narušimo prirodnu ravnotežu i kvalitetu okoliša. Poboljšanje sustava za pročišćavanje otpadnih voda u Hrvatskoj je prioritet Nacionalne strategije zaštite okoliša (NN 46/2002). Nužno je usklađivanje nacionalnog zakonodavstva s Direktivom 91/271/EEZ o pročišćavanju komunalnih otpadnih voda. Revidiranim „Planom provedbe vodno-komunalnih direktiva“ iz studenog 2010. godine, a donešenim od strane Vlade Reublike Hrvatske, u poglavlju 4, propisano je prijelazno razdoblje ispunjenja obveza Direktive o pročišćavanju komunalnih otpadnih voda s rokom do 31. prosinca 2018. godine. Svrha ovog rada je utvrditi parametre onečišćenja, odnosno efikasnost pročišćavanja otpadnih voda na pročistaču otpadnih voda grada Velike Gorice za godinu 2012. i 2013. Cilj je istražiti efikasnost kroz rezultate dobivene laboratorijskim analizama otpadne vode prije ulaska u sustav pročišćavanja i nakon njega. Prate se Zakonom propisani parametri koji bi u slučaju većih odstupanja mogli štetno djelovati na zdravlje ljudi i životinja nakon ispuštanja. Tijekom 2012. od ukupnog broja analiza, prekoračenje propisanih graničnih vrijednosti (dalje u tekstu PGV) efluenta, zabilježeno je u 47,8 % analiza za ukupno suspendiranu tvar; 21,7 % za KPK; 10,9 % za BPK5; 8,7 %; za nitrite i 17,4 % za nitrate. Zabilježeno je konstantno prekoračenje PGV efluenta za amonij (97,8 %), ukupni dušik (100 %), orto-fosfate (100 %) i ukupni fosfor (97,7 %). U 2013. su zabilježeni bolji rezultati, prvenstveno zbog rekonstrukcije uređaja i povećanja kapaciteta Bloka I. Značajno poboljšanje je zabilježeno u rezultatima analiza efluenta za ukupno suspendiranu tvar (8,3 % analiza prelazi PGV), KPK (nema prekoračenja PGV-a) , BPK5 (2,1 % analiza prelazi PGV) i nitrite (6,5 %). Jedino su se pogoršali rezultati analiza nitrata (66,7 % analiza prelazi PGV). Međutim, kao i u prethodnom razdoblju zabilježena su stalna prekoračenja PGV za amonij (100 %), ukupni dušik (100 %), orto-fosfate (100 %) i ukupni fosfor (97,9 %). Nadležne službe za inspekcijski nadzor od strane Hrvatskih voda, utvrdile su da će se dodatnom rekonstrukcijom/dogradnjom/izgradnjom uređaja te tako i povećanjem njegovog kapaciteta, izgradnjom III. stupnja pročišćavanja, a sve prema projektnoj dokumentaciji temeljem Studije izvedivosti i Aplikacije do kraja 2014., otkloniti svi prethodno navedeni problemi.The wastewater treatment system is the correct way in which human population should act responsibly towards the water taken from nature, and its release into the same. Water should be purified to degree that its recapture do not disturb the natural balance and environmental quality. Improving systems for wastewater treatment in Croatia is priority of the National Environmental Strategy (NN 46/2002). It is necessary to harmonize of the national legislation with Directive 91/271 / EEC concerning urban waste water. According to the revised "Plan of Implementation water utility directives" from November 2010, which was passed by the Republic of Croatia’s Government, in Chapter 4 that prescribes a transition period to comply with obligations of the Directive concerning urban waste water with the deadline until 31 December 2018. The purpose of this study is to determine the parameters of pollution, regarding the efficiency of wastewater treatment at the wastewater treatment plant responsible for city Velika Gorica for the year 2012. and 2013. The aim is to explore the efficiency through results obtained from the laboratory analysis of the waste water before entering the treatment system and afterwards. Statutory parameters are monitored which in case of larger deviations would cause harm to the health of humans and animals after its release. In 2012 the total number of analyzes, exceeding the prescribed limit value (hereinafter PLV) for effluent, was observed in 47.8% of analyzes for total suspended solids; 21.7% for COD; 10.9% for BOD5; 8.7 % of nitrites and nitrates for 17.4%. It is noted consistently exceeding the effluent ammonium PLV (97.8%), total nitrogen (100 %), ortho-phosphate (100 %) and total phosphorus (97.7%). During 2013 some better results had been recorded, primarily due to the reconstruction of the device and increase the capacity of Block I. Significantly improved the results of analysis of effluent for total suspended solids (8.3% analysis exceed PLV), COD (not exceeding PLV at all), BOD5 (2.1% exceeds PLV) and nitrite (6.5%). Only the worsened results of the analysis of nitrate (66.7% exceed PLV). However, as in the previous period were recorded persistent breaches PLV of ammonia (100 %), total nitrogen (100 %), ortho-phosphate (100 %) and total phosphorus (97.9%). The service in charge for the inspection, situated by the Croatian Waters, have come to the conclusion that the additional reconstruction / upgrading / construction of the device, and therefore the enlargement of its capacity together with building III. treatment level, all done according to the project documentation based on the Feasibility Study and Applications, will eliminate all of these previously mentioned problems by the end of 2014