ClO2 Technology

Ecochlor® Ballast Water Treatment Systems use chlorine dioxide technology, which has been used in water treatment and industrial applications for over 70 years.

  • Completely effective on all potential aquatic invasive species including zooplankton, phytoplankton, algae, microorganisms and even pathogens and viruses, regardless of turbidity, salinity or temperature
  • Ideally suited for installation on all ships especially the largest bulkers and tankers in the world
  • Meets or exceeds both IMO D2 and USCG standards
  • Superior economic scale-up performance over competition
  • Design options for hazardous area installations

Chlorine dioxide (ClO2)

Chlorine dioxide (ClO2) is a highly effective oxidant and biocide used around the world in a wide range of water purification applications. Ecolab/Nalco is the world’s leading manufacturer of chlorine dioxide chemicals, and Ecochlor is the exclusive worldwide licensee of Ecolab/Nalco’s Purate™ chlorine dioxide technology for the disinfection of ship ballast water.

The Ecochlor proprietary ballast water treatment system, utilizing Ecolab/Nalco’s patented Purate ClO2 technology, has been specifically designed to safely and economically eliminate the transfer of aquatic invasive species.

Why ClO2?

ClO2 offers a number of advantages over other disinfection chemicals and techniques. It’s a proven technology used in a wide range of water purification and industrial applications. It is effective on all aquatic organisms, including bacteria and other pathogens. It is also effective in high turbidity waters because ClO2 does not combine with organics. Because of its unique properties, it can be generated, safely and reliably, on demand, and will not affect ballast tank coatings. Its decomposition by-products are environmentally safe.

Chlorine Dioxide is not Chlorine

Chlorine dioxide is not chlorine! They are two different chemical compounds, which react differently when mixed with water. As a result, chlorine dioxide has 2.5 times the disinfectant power of chlorine. It works across a wider pH range, and is more effective in dirty water. For more information on the difference between chlorine dioxide and chlorine, see this article.

ClO2 Chemistry

The basic chemistry is straightforward. A key point: no aqueous or gaseous chlorine is used or produced in this process.

Why Purate?

Purate simplifies the production of ClO2. Purate, acid and water mixed in a generator produces an aqueous ClO2 solution, without using or producing aqueous or gaseous chlorine in the process. Purate is a unique, stabilized compound of sodium chlorate and hydrogen peroxide produced at many locations around the world.

Wide range of applications

ClO2 is effective in a wide variety of treatment applications, including drinking water, municipal waste, food and pulp and paper. In drinking water plants it offers cost and performance advantages over other disinfectant options, and has fewer regulatory and safety concerns compared to chlorination. To read more about other applications, go to the Ecolab/Nalco’s website.

On-board generation of ClO2

The process generates ClO2 as needed to treat incoming ballast water. A small amount of supply water flowing through a venturi creates a vacuum that draws the PurateTM BWT and acid into the mixing chamber. When the chemicals mix they form a dilute aqueous ClO2 solution which is then injected into the ballast water line. Learn more.