THE FUTURE OF THE OCEAN CONCERNS US ALL! Learn more about oily and waste water treatment and how you can be a part of saving the oceans. Come and […]
THE FUTURE OF THE OCEAN CONCERNS US ALL!
Learn more about oily and waste water treatment and how you can be a part of saving the oceans.
Come and visit our team! We will be happy to guide you to make the right choice for your ship.
On the ship, dedicated tanks are provided to store the fresh water. However, they can easily get contaminated. Several methods are used to disinfect water, such as UV light or […]
On the ship, dedicated tanks are provided to store the fresh water. However, they can easily get contaminated. Several methods are used to disinfect water, such as UV light or disinfection of the water with silver ions.
In the below text we would like to clarify the difference between both methods and how they operate.
JOWA Ag-S (Silver Ions) and UV water treatment systems are both methods of water disinfection, but they operate in different ways and have distinct advantages and disadvantages.
The Ag-S system uses silver ions to treat water through an oligodynamic process, in which silver ions at concentrations of 0.01-0.1 mg/L inhibit the metabolism of bacteria. This method has been used for centuries, from storing milk and water in silver containers to treating wounds with silver foils. Silver ions are also effective against legionella bacteria and have a residual effect, meaning that the efficacy lasts for weeks in water even with extreme temperatures.
Unlike chlorine, hot water does not degrade the efficacy of silver ions. The silver ions are introduced into water through charged silver plates in a controlled water stream, and the Ag-S system is designed to take a small water flow and dose silver ions into it, which is then mixed in storage tanks to treat the full volume of water. This allows for a small system and easy installation, and the treated water does not have an altered taste or smell.
UV light is a common way to sterilize fresh water and is effective against all viruses, bacterias and protozoa.
On the other hand, the UV water disinfection process uses UV lamps that emit light at 254 nanometers. The treated water is passed through a chamber and exposed to the UV light, which attacks the DNA/RNA of microorganisms, eliminating their ability to function and reproduce. This treatment is instantaneous but does not offer any lasting efficacy and only works if the water is clear. The UV system is typically installed at the outlet of the water supply pressure set on ships and is designed to treat the full volume of water used, whereas the Ag-S system takes a small flow off the pressure set and then mixes it back into the storage tanks to treat all the water.
The Ag-S silver ion units have some interesting applications in both marine and land-based facilities. For example, Ag-S units are used on yachts for charter, as chlorine dosing systems can cause a bad taste/smell of potable water and spots on bright work during wash-downs. Ag-S units are also used in water bottling applications, as they offer long-term efficacy, unlike UV or Ozone treatments. Additionally, hospital hot water systems use silver ion units to keep the water safe, as chlorine does not work as well in hot water, and hospitals have been found to have legionella bacteria in their hot water systems.
In summary, JOWA Ag-S and UV water treatment systems are both methods of water disinfection, but they operate differently and have different advantages and disadvantages. Ag-S systems use silver ions to treat water, have a residual effect, and are small and easy to install, while UV systems use UV light to disinfect water, are instantaneous but do not have a lasting effect, and only work if the water is clear.
Will you visit Donsö Shipping meet (DSM) August 28-30? In that case we would be delighted to see you. Meet us in JOWAs both located in SMTF common stand 34! […]
Will you visit Donsö Shipping meet (DSM) August 28-30? In that case we would be delighted to see you. Meet us in JOWAs both located in SMTF common stand 34!
Hope to see you there!
On Friday the 23rd of June the Swedish office will be closed as we will celebrate Midsommar (Midsummer), the most cherished tradition in Sweden. This is the longest day of […]
On Friday the 23rd of June the Swedish office will be closed as we will celebrate Midsommar (Midsummer), the most cherished tradition in Sweden. This is the longest day of the year, and it also means that we have passed half of 2023.
The team at JOWA Sweden would like to thank all our partners, customers, agents and colleagues around the world for successful past six months with many exiting projects and a growing service network and spare parts supply worldwide. We wouldn’t be here without our hard work together.
We wish you all a nice weekend. Ourselves, we will celebrate with friends and family. We will have flowers in our hair and dance around a pole and play games. We will eat pickled herring and sing “snapsvisor”. All until the magical midsummer night when the sun never sets.
For urgent matters please check our website www.jowa.com for nearest contact.
You may learn more about the Swedish Midsummer tradition here!
Sustainable ocean economy concerns us all!
Sustainable ocean economy concerns us all! Keeping with JOWAs environmental mission we supply a number of products which we believe make an impact of the sustainable ocean economy. They are built to deliver quality and efficiency to preserve the marine environment.
To mention a few, we would like to highlight JOWA PES – Propeller Shaft Earthing, JOWA Homogenizer System, Metritape Level Gauging Systems and JOWA Biotal Eco-benign chemicals.
You can find out more about their unique benefits and how these products can help you to be a part of a sustainable ocean economy here.
JOWAs mission is to make sure that the vessel equipment follows MARPOL requirement and to offer the ultimate solution for shipowners to reduce their human footprint in the ocean.
In the marine sector you hear a lot about MARPOL. But what is MARPOL?
MARPOL covers regulations for the control of different aspects of marine pollution and is a major convention of IMO. Its purpose is to preserve the marine environment by the elimination of pollution from all harmful substances discharged from ship.
When we at JOWA talk about MARPOL equipment we refer to vessel equipment which follows MARPOL 73/78 requirement. In JOWAs case that is treatment of oily and sewage water before discharge in the sea. Our products prevent oil and sewage discharge.
Treatment of oily water
JOWA 3sep Oliy Water separator separates the oil and other harmful contaminants from bilge water before discharge in the oceans. In accordance with MARPOL (IMO) MEPC 107(49) the amount oil in bilgewater is 15 ppm which a vessel is allowed to discharge into the ocean from the bilge.
JOWA ODME (Oil Discarge Monitor) 2005 is used to measure the oil content in the water before the discharge to prevent oil pollution! Only water within MARPOL requirement regarding oil discharge is allowed to pass and discharged overboard.
Treatment of sewage water
JOWA STP 2016 – Sewage Treatment Plant is designed to treat and process raw sewage in different steps before discharge into the ocean. In accordance to MARPOL all ships above 400 gross tonnage and a crew more than 15 persons are required to treat the discharge or hold sewage (black water) for appropriate time.
It can be very expensive for a seafarer or a commercial vessel in case of failure to follow MARPOL requirement. The fines are huge and the ship will be stopped.
JOWAs mission is to make sure that the vessel equipment follows MARPOL requirement and to offer the ultimate solution for shipowners to reduce their human footprint in the ocean.
On the ocean around the globe thousands of ships are fitted with JOWAs MARPOL equipment. With that said we proudly contribute to prevention of oil and sewage pollution in the sea and to keep our oceans cleaner.
Read more about our oily and waste water treatment system here!