Metode imputacije nedostajućih vrijednosti na primjeru slijeganja biootpada

Otpad predstavlja sve veći problem u današnjem potrošačkom društvu. Bilo da se on gomila, razlaže u podzemnim vodama ili spaljivanjem širi atmosferom, otpad ozbiljno ugrožava okoliš i zdravlje ljudi. Stoga je u svim dijelovima svijeta krenula utrka za stvaranjem čišćeg okoliša pri čemu se otpad smatra resursom, a njegova obrada spada u najnaprednije tehnologije. U ovom radu prikazane su vrste otpada te problemi oko zbrinjavanja otpada s naglaskom na biootpad koji u mješovitom komunalnom otpadu predstavlja najveći problem jer je on najveći izvor odlagališnih plinova i organske tvari u procjednim vodama odlagališta. Gotovo ¼ mješanog komunalnog otpada iz kućanstva čini biootpad. Zbog toga se R Hrvatska u pretpristupnim pregovorima s EU obvezala na rješavanje problema u gospodarenju otpadom. Jedan od stavki je i smanjenje odloženog biootpada na odlagališta. Danas se na odlagališta odlaže oko 800 000 t/g. biootpada, dok se do 31.12.2020. ta količina planira smanjiti na oko 250 000 t/g. Jedan od prihvatljivih načina zbrinjavanja biootpada je kompostiranje. U radu je proveden eksperiment slijeganja biootpada u kompostani, te su mjerenja slijeganja mjerena 8 tjedana. Nakon mjerenja, pomoću generator slučajnih brojeva “izbačeno” je 5%, odnosno 25% vrijednosti te su za nedostajuće podatke primjenjene metode imputacije i metoda brisanja redaka (Listwise deletion). Korištenjem opisne statistike prikazane su dobrote slaganja sa stvarnim podacima. Waste is a growing problem in today's consumer society. Whether it piles, breaks down in underground waters or spreads into atmosphere by incineration, waste seriously endangers the environment and human health. Therefore, in all parts of the world, a race is started to create a cleaner environment, where waste is considered a resource, and its processing is one of the most advanced technologies. This paper presents the types of waste and the waste management problems with a focus on bio-waste that is the most problematic in mixed municipal waste, since it is the largest source of landfill gas and organic matter in the seepage waters of landfills. Nearly ¼ of mixed municipal waste from the households is a bio-waste. For this reason, Croatia in preaccession negotiations with the EU has committed itself to addressing problems in waste management. One of the items is also the reduction of the decommissioned bio-waste at landfills. Today, about 800,000 t / y of bio-waste is landfilled at landfills, this amount is planned to be reduced to about 250 000 t / y by 31.12.2020. One of the acceptable methods of disposing biowaste is composting. The experiment of bio-waste subsidence in a composting plant has been carried out in this paper and measurements of subsidence were measured for 8 weeks. After the measurement, the random number generator "threw out" 5%, respectively 25% of the value. For the missing data the method of imputation and the mothod of deleter lines (Listwise deletion) were applied. The goodness of matching with the actual data is shown by using descriptive statistics.