Boat pressure washing wastewater treatment with calcium oxide and/or ferric chloride (CROSBI ID 183021)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Oreščanin, Višnja ; Kollar, Robert ; Nađ, Karlo ; Lovrenčić Mikelić, Ivanka ; Mikulić, Nenad
engleski
Boat pressure washing wastewater treatment with calcium oxide and/or ferric chloride
The aim of this study was to investigate the efficiency of (1) chemical precipitation by calcium oxide, (2) coagulation/flocculation by ferric chloride (FC), and (3) the combination these two methods in reducing the toxicity of wastewater generated by boat pressure washing. All three methods gave satisfactory results in the removal of colour, turbidity, Cr, Fe, Cu, Zn, and Pb. The concentrations of heavy metals were lowered below national limits with 1 g of CaO, 2.54 mg of Fe3+ in the form of FeCl3×6H2O, and the combination of 0.25 g of CaO and 5.08 mg of Fe3+ per 50 mL of wastewater. Both CaO (1.5 g per 50 mL of wastewater) and FC proved efficient, but their combination mL yielded a significantly better performance: 99.41 %, 100.00 %, 97.87 %, 99.09 %, 99.90 %, 99.46 % and 98.33 % for colour, turbidity, Cr, Fe, Cu, Zn, and Pb respectively. For colour, Cr, Cu, Zn, and Pb removal efficiencies increased in the following order: FC<CaO<CaO+FC, while this order for turbidity and iron was as follows: CaO<FC<CaO+FC. As expected, all three methods increased the concentration of total dissolved solids in the final effluent. Our results suggest that the combined treatment of marina wastewaters with calcium oxide followed by ferric chloride is efficient, cost effective, and user friendly.
antifouling paints ; CaO ; chromium ; colour ; copper ; lead ; heavy metals ; turbidity ; zinc
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Podaci o izdanju
Povezanost rada
Kemija, Javno zdravstvo i zdravstvena zaštita