BWMS - Ballast Water Management System - Hi-sea




1. BWMS Preface

    This device is a combined treatment system utilizing self-cleaning filter and medium pressure UV technologies which is ideal for vessels of all types and sizes, and able to perform under all salinities and temperatures. The system can fully utilize intensity variable UV to tailor dosage to efficiently disinfect, effectively preventing reproduction of viable invasive aquatic organisms and bacteria in water without risk of discharging any toxic substances during de-ballasting operations.

    The 40 micron self-cleaning filter not only removes TSS in the incoming water, reducing turbidity and maximizing UVT value, to effectively improve the transmission of UV light, hence enabling the same efficacy with a lower power consumption; In addition, it also effectively controls the amount of sediment entering the ballast tank, thus effectively reducing rate of the deadweight loss due to sediment accumulation.
2. BWMS Advantages

    (1) compared to chemical technology
    More safe, no chemicals, no exposure, explosive and corrosion risk; more easy for structure, operation, maintenance ; don’t cause second pollution.

    (2) compared to other UV technology
    Unique design concept makes it fit for existing ships or new-builders; simple structure and minimum space required; many ship owners intend to select “simple” System for their ships;Sufficient and flexible UV dosage allow to meet more stringent standards without considering up]date system in later stage.

3. BWMS System Principle

    During Ballasting, the incoming feed water enters through the ballast pump into the filter unit, removing most of the aquatic organisms and solids, ensuring that the UV unit after the filter can operate normally. Over time, a filter cake develops on the fine filter surface due to the accumulation of retained solids on the surface of the fine filter, causing a pressure differential to develop across the filter element. When the differential pressure reaches the set value (typically 0.5bar), the self-cleaning mode triggers automatically and discharges the backwash mud into the local aquatic environment; after filtration, the filtered water enters the medium pressure UV reactor, upon being exposed to UV-C wavelength radiation, most of the plankton, bacteria, viruses, oocysts, ova of aquatic organisms, larva etc would be eradicated, and the treated water then distributed into various ballast tanks.

    During deballasting, water from the various ballast tanks pass through the ships piping network, flows into the ballast pump and into the BWMS. This time, the filter unit is bypassed, and the water directly enters the MPUV reactor for a second round of disinfection, to prevent tank secondary contamination and dark repair regrowth, before discharge.

4. BWMS Several Class Certificates Supply:
ABS, BV, DNV, GL, KR, RINA, NK, USCG and CCS class certificates.

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