Removal of arsenic and natural organic matter from ground water using coagulation and sorption

Bunarske vode najznačajniji su izvori pitke vode na području istočne Hrvatske. Podzemne vode na tom području uslijed geološkog sastava tla imaju povišene koncentracije organskih tvari, željeza, mangana, arsena i amonijaka. Konzumacija arsenom kontaminiranih voda uzrokuje kronično trovanje koje se manifestira pojavom različitih toksičnih i karcinogenih učinaka u ljudskom organizmu. U cilju uklanjanja arsena i oksidaciju As (III) u As (V), te uklanjanju organskih tvari metodom koagulacije i flokulacije iz aerirane sirove vode uzete u pogonu “Vodovoda“ Osijek, pomoću Jar-testa ispitale su se različite kombinacije vrste i koncentracije koagulanta: FeSO4, Fe2(SO4)3, FeCl3 i oksidansa: KMnO4 i H2O2, uz optimalne pH vrijednosti za izdvajanje arsena. Ovim radom nastojalo se pridonijeti dugoročnom unaprjeđenju kakvoće pitke vode u Osječko-baranjskoj županiji. Istraživanje je posebno aktualno u zadnje vrijeme, budući da je koncentracija arsena u pitkoj vodi snižena zbog zahtijeva EU.Well water are the most important sources of drinking water in the eastern Croatian. Due to the geological composition of soil, groundwater in the area have elevated concentrations of organic matter, iron, manganese, arsenic and ammonia. Consumption of arsenic contaminated water causes chronic poisoning, which manifests as the emergence of various toxic and carcinogenic effects in humans. In order to remove arsenic and the oxidation of As (III) to As (V), and removal of organic matter by coagulation and flocculation in aerated raw water taken at the facility, "Vodovod" Osijek, using a Jar-test we examined the different combinations of type and concentration of coagulant: FeSO4, Fe2(SO4)3, FeCl3, and oxidants: KMnO4 and H2O2, the optimum pH value for extracting arsenic. This paper attempts to contribute to long-term improvement of quality of drinking water in the Osječko-Baranjaska county. The research is particularly topical in recent times, since the concentration of arsenic in drinking water reduced because of EU requirements