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Shipboard waste management Possible improvements

Shipboard waste management Possible improvements. Tripartite meeting 15/16 September 2006; Seoul dragos.rauta@intertanko.com. Shipboard waste management. ER Bilge & Sludge Treatment Systems Sewage & Galley effluent Treatment Systems Air Emissions Treatment Systems Garbage.

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Shipboard waste management Possible improvements

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  1. Shipboard waste management Possible improvements Tripartite meeting 15/16 September 2006; Seoul dragos.rauta@intertanko.com

  2. Shipboard waste management • ER Bilge & Sludge Treatment Systems • Sewage & Galley effluent Treatment Systems • Air Emissions Treatment Systems • Garbage

  3. INTEGRATED BILGE TREATMENT SYSTEM (IBTS) MSC 55/6/1 – correlation between regulations in MARPOL Annexes I & VI BUT . . . . . . STILL NEED FOR DESIGN & ARRAGEMENT CLARIFICATIONS

  4. ER Bilge & Sludge TreatmentAreas for improvement • Bilge water treatment/OWS systems • Sludge treatment systems • Bilge Water/Sludge treatment systems interface

  5. Bilge water treatment/OWS • OWS capacity on current designs • Aframax - only 2 cub.m/h • Handymax tanker - only 1 cub.m/h • OWS minimum design criteria • Aframax – min. 5 cub.m/h • Suezmax/VLCC – min. 10 cub.m/h • Recommendation:address the issue of Oily Water Separator capacity

  6. Bilge water treatment/OWS • Oily bilge water collecting tank • Recommendation: • Mandate for 2 bilge water collecting tanks, in line with MEPC.1/Circ.511 • Increase the volume of bildge water collecting tanks (as per MEPC 55/6/1) • Oily bilge water in the bilge wells is transferred to the bilge primary tank (of cascade type, with heating possibilities till 90ºC for pre-separation of oil). The high oil contained water is transferred to sludge tanks and the low oil contained water is transferred to the oily bilge water collecting tank.

  7. Sludge treatment • Sludge treatment systems should have 2 sludge tanks operating either in parallel or in series. • These tanks should have enough heating capacity to raise the temperature up to 85º C to assist the separation of the water and also boil off some of the water through the venting arrangements. • Separate sludge tanks are arranged for fuel/diesel oil purifiers and lube oil purifiers • Sludge tank design to facilitate cleaning

  8. Sludge tank for separators design • Tank volume: 2 days storage at a • discharge interval of 2 hours • Manhole for inspection and cleaning • Fitted with a sounding pipe. • Tank floor with a slope of minimum 15°. • The sludge outlet pump connection • positioned in the lowest part of the tank. • High level alarm switch, connected to the sludge pump • Heating coil to keep the sludge warm and fluidwhile • being pumped out • Tank ventilation must follow the classification rules for • evacuation of gases • There should be a ventilation pipe to fresh air • The ventilation pipe should be straight. Any bends must • be gradual • The ventilation pipe kept above the tank top • A sludge tank with partition walls must have ventilation • pipes in all compartments

  9. Boiler soot washings • Recommendation: for new buildings, a separate collecting tank for boiler soot washings treatment

  10. Incinerators • for new buildings: - anticipated sludge production on board will be 0.8% to 1% HFO daily consumption, plus 0.5% MDO daily consumption, plus 15 l every 1000 kw M/E power from drains - sizing of the incinerator based on maximum operation period of 12 hours/day of which only 10 hours will be used for liquid sludge and solid waste and the rest of the period to be used for heating-up/cooling-down, cleaning andmaintenance

  11. CONCLUSIONS • There is room for improvements • IMO revise its regulations • The industry could jointly consider aspects related to design solutions • Are these a theme for the Tripartite? COMMENTS & DISCUSSIONS WELCOMED

  12. IMO Developments • Nov. 1978 – Res. A.393(X) – Recommendation on international performance and test specifications for OWS equipment and OCM • October 1992 – Res. MEPC.107(49) • September 1997 – Res. MEPC.76 (40) on incinerators • October 2004 – Res. MEPC.117(52) • April 2006 – MEPC.1/Circ.511 amended (IBTS) • October 2006 – Danish proposal for further changes

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