Removal of arsenic, manganese and iron from drinking water

Prisustvo arsena, mangana i željeza u vodi za piće je nepoželjno. U novije vrijeme se proučavaju napredni oksidacijski procesi za uklanjanje anorganskih spojeva kao što su teški metali iz vode.U radu je otopina arsena, mangana i željeza obrađivana na adsorpcijskim masama Bayoxide, Birm, Greensand i Piroluzit, metodama katalitičke oksidacije i taloženja, te adsorpcije. Radi izrazito nepovoljnih rezultata uklanjanja mangana na masi Greensand, vršeni su eksperimenti oksidacije uzorka sa KMnO4 i aktivacije Greensanda sa KMnO4 i HCl-om. Osim ovih metoda, provedene su metode ozonizacije, te i flokulacije sa FeCl3 kako bi se utvrdila uspješnost uklanjanja arsena, mangana i željeza. Aktivacijom Greensanda sa HCl-om postignuto je 99%-tno uklanjanje mangana, što na Greensandu bez tretmana nije bilo moguće. Tretmanom uzorka ozonom, postignuto je 99% uklanjanje mangana. Adsorpcijska masa Bayoxide ima 100%-tnu moć adsorpcije arsena u vremenu od 20 sati. Optimalna koncentracija flokulanta FeCl3 za uklanjanje arsena i mangana iz modalne otopine iznosla je 40 mg L-1. Uklanjanje željeza, svim provedenim metodama, bilo je izrazito uspješno.Occurrence of arsenic, manganese and iron in water is undesirable. Recently, advanced oxidation processes are being investigated for removal of inorganic matter such as heavy metals from water. In this work solution with arsenic, manganese and iron were treated with Byokside, Birm, Greensand i Piroluzit using catalitic oxidation and adsorption methods. Becouse of bad results made by manganese removal on Greensand, experiments were conducted using oxidation of model solution with KMnO4, and activation of Greensand with KMnO4 and HCl. Besides these experiments, methods of ozonization and flocculation with FeCl3 were carried through. Using methods of Greensand activation with HCl and treating the model solution with ozone, 99% of manganese was removed. Bayokside had power to completly adsorbe arsenic from model solution. Optimal concentration of FeCl3 for removing arsenic and manganese from model solution was 40mgL-1. Iron removal using these methods was extreamly sucessful