PCH Series Personal Benchtop Cooler / Heater

Coldharbour Marine Ltd Derby - Ballast Water Treatment Systems

Coldharbour Marine Ltd Derby Research & Development Team


Organisation Background

For more than 35 years, Coldharbour Marine has been developing products and designs used extensively in the marine and offshore sectors.

Ballast Water Treatment Systems

Coldharbour are developing ballast water treatment systems to address current and future environmental requirements.  Organisms can exist in the ballast water of ships; this is very undesirable as this water can contain micro-organisms and larger flora and fauna such as molluscs which can survive within the ship. 

To take these organisms from one part of the world and then discharge them in another could create many environmental issues, as well as the internal physical damage that can occur in the ships tanks;

Ballast waterballast water 2

Coldharbour have developed a system to add gas into the ballast water, causing oxygen to be stripped from the water whilst the elevated level of CO2 in the inert gas temporarily reduces the pH of the water. This simultaneously induces hypoxia and a condition known as hypercapnia in marine life. These conditions are fatal to both aerobic and anaerobic organisms. Ultrasonic shockwaves are also produced to effectively kill the enteric bacteria such as e-coli.


The lack of oxygen also suppresses the corrosive effect of sea water, giving significant savings in maintenance costs through a substantial reduction in ballast tank corrosion.

Because Coldharbour does not use active chemicals to achieve the required ballast water standards it means that when the treated water is eventually discharged it poses no threat to the marine environment. The treated ballast water can be re-oxygenated prior to discharge, ready to once again support life in the ocean.


Grant Instruments

 PCH cold harbor

Coldharbour’s Research & Development team based in South Normanton has found the Grant bio PCH-2 Dry Block Heating/Cooling system invaluable in helping to measure the effectiveness of the ballast water treatment;

  • Incubating photosynthetic organisms including phytoplankton, e-coli and other bacteria, in 20 x 1.5ml tubes at around 20 °C to 25°C with Cyber Green before analysing with flow cytometry.
  • Incubating at 80°C to kill all the organisms to be able to use as a test reference sample.