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Boat Pressure Washing Wastewater Treatment With Calcium Oxide and/or Ferric Chloride

Višnja Oreščanin orcid id ; Advanced Energy Ltd, Zagreb Croatia
Robert Kollar ; Advanced Energy Ltd, Zagreb Croatia
Karlo Nađ ; Advanced Energy Ltd, Zagreb Croatia
Ivanka Lovrenčić Mikelić ; Laboratory for Radioecology, Institute R. Boskovic, Zagreb, Croatia
Nenad Mikulić ; Ministry for Environmental Protection and Physical Planning and Construction, Zagreb, Croatia

Puni tekst: engleski pdf 172 Kb

str. 21-25

preuzimanja: 820



The aim of this study was to investigate the effi ciency 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 (1.50 g per 50 mL of wastewater) and FC proved efficient, but their combination 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

Ključne riječi

antifouling paints; CaO; chromium; colour; copper; lead; heavy metals; turbidity; zinc

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Podaci na drugim jezicima: hrvatski

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