A first evaluation of ClO2 activity on the fouling communities of the cooling system of a power plant in Brindisi Nord (Brindisi, SE Italy) has been carried out, High antifouling effectiveness of ClO2 on marine organisms was proved by monthly observations of suspended panels in the ClO2-treated cooling water of the Brindisi power plant. Static bioassays demonstrated that ClO2 significantly affects (p≤0.05) embryo development of the sea urchin Sphaerechinus granularis at the nominal concentration of 2.2. ppm. Continuous flow system aquaria allowed growth bioassays of Laomedea flexuosa hydroid colonies at very low concentrations (0.05 ppm, 0.1 ppm, 0.2 ppm ClO2). A 96-hour exposure to 0.05 ppm ClO2 caused a significant inhibition (p≤ 0.001) of colony growth. Higher concentrations caused a more rapid (24-48 hours) growth arrest and shrinkage of colonies.
Field and laboratory efficacy of chlorine dioxide as antifouling in cooling systems of power plants
PIRAINO, Stefano
1993-01-01
Abstract
A first evaluation of ClO2 activity on the fouling communities of the cooling system of a power plant in Brindisi Nord (Brindisi, SE Italy) has been carried out, High antifouling effectiveness of ClO2 on marine organisms was proved by monthly observations of suspended panels in the ClO2-treated cooling water of the Brindisi power plant. Static bioassays demonstrated that ClO2 significantly affects (p≤0.05) embryo development of the sea urchin Sphaerechinus granularis at the nominal concentration of 2.2. ppm. Continuous flow system aquaria allowed growth bioassays of Laomedea flexuosa hydroid colonies at very low concentrations (0.05 ppm, 0.1 ppm, 0.2 ppm ClO2). A 96-hour exposure to 0.05 ppm ClO2 caused a significant inhibition (p≤ 0.001) of colony growth. Higher concentrations caused a more rapid (24-48 hours) growth arrest and shrinkage of colonies.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
