<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">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 FeCl3x6H2O, 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&lt;CaO&lt;CaO+FC, while this order for turbidity and Fe was as follows: CaO&lt;FC&lt;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.</abstract>

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 FeCl3x6H2O, 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<CaO<CaO+FC, while this order for turbidity and Fe 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.

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

Laboratory for Radioecology, Institute R. Boskovic, Zagreb, Croatia

Ministry for Environmental Protection and Physical Planning and Construction, Zagreb, Croatia

Archives of Industrial Hygiene and Toxicology

The aim of this study was to investigate the efficiency of (1) chemical precipitation by calcium oxide, (2) coagulation/flocculation by ferric chloride (FC),...

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

Published Online: Mar 26, 2012

Page range: 21 - 26

DOI: https://doi.org/10.2478/10004-1254-63-2012-2194

Keywords
boja, boje protiv obraštaja, CaO, mutnoća, teški metali, željezo(III) klorid

This content is open access.

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

Published Online: Mar 26, 2012

Page range: 21 - 26

DOI: https://doi.org/10.2478/10004-1254-63-2012-2194

Keywordsboja, boje protiv obraštaja, CaO, mutnoća, teški metali, željezo(III) klorid

This content is open access.

Keywords
boja, boje protiv obraštaja, CaO, mutnoća, teški metali, željezo(III) klorid