Using our technology Cruise ships are able to reduce their operating costs considerably

The separate derivation of black and grey water is normal in cross driving ships

Cruise ships are supplied with desalination plants. The grey water is cleaned and derived into the oceans again, while the black water is stored and disposed of in the next  port.

The desalination of sea water runs for ships differently as onshore

Onshore seawater desalination is mostly carried out in so-called reverse osmosis plants (RO-plants). Seawater is pumped along a desalination membrane, which pores are too small for salt ions with their hydrate covers (a cover of water molecules “bound” around the salt ion due to the electric charge of the ion). Simultaneously, water is pressed through the pores of the membrane. Thus, the salt in the water stream flowing along the membrane is concentrated up to 70%. This costs a large amount of energy.

The desalination of sea water in land-based RO-plants runs differently compared to cruisers. The membrane of ships is in the open sea – actually, the stream flowing along the membrane IS the open sea – thus, the salts cannot concentrate at the membrane. Therefore, desalination in the open sea costs considerably much less energy than in land-based RO-plants. But the basic energy against the osmotic pressure of the normal salt concentration of approx. 40 g/l in the seas must still be applied.

Our technique makes it possible for ships to lower its operating costs

After our technique is installed in ships, there is no more storage of black water. No more disposals in the ports. And the energy consumption of the ship's own desalination plants is lowered considerably. Simultaneously the ship's own water quality improves considerably. How does this works? Ask us!