Water heating has been determined to be an effective ballast water treatment method; however the method has major limitations one in particular being the heating time required for efficiency. Laboratory results have showed that conventional water heating requires a temperature of at least 35 ⁰C for 20-80 hours to be effective. However a novel technique, short-time technique, only requires temperatures between (40- 65 ⁰ C ) for 15 hours has been effective.
Quilez-Badia from the University of Newcastle upon Tyne, et al.(2008) conducted a field study short-time high temperature under operational conditions, with the aim of monitoring the method’s effectiveness at removing bacteria, phytoplankton and zooplankton.
According to Badia et al.(2008) the results indicate that running the water through the pump system installed in the short-time method increased the mortality rate of the microorganisms, but increasing the temperature above 55⁰C did not improve the efficiency of the short-time heat treatment.
Source: Marine Poll Bull 2008, 56(09) 1093-1097 DOI: 10.1016/j.marpolbul.1037.2007.09.036