BLUE OCEAN SHIELD（BOS） ballast water treatment system, a compact, modular and reliable Ballast Water Treatment System, is designed and developed by COSCO Shipbuilding Industry Company and Tsinghua University. The product design and material selection follows standard marine practice to achieve safe and reliable solutions for both new building and retrofit applications. BOS incorporates a two-stage approach of filtration and UV sterilization to effectively manage the ballast water.
China’s COSCO shipbuilding group has been granted USCG type-approval for its Blue Ocean Shield system and is described as a mechanical filter, medium-pressure UV disinfection system comprising:
When ballasting, Blue Ocean Shield removes sediments and micro-organisms greater than 50μm. Ballast water then enters the UV reactor, an appropriate dose of UV ray is generated to inactivate the organisms, such as algae and bacteria, in the water. Once treated, the ballast water arrives in the ballast tank.
When de-ballasting, the filter is automatically bypassed, the ballast water goes directly through the UV unit and receives a second UV treatment, ensuring discharged water in compliance with the convention and USCG’s requirements.
Blue Ocean Shield BWMS is available in seven base models with flow rates ranging from 100 m3 to 1,200 m3. Combining base models into sets gives flow rates in excess of 4,000 m3.
