Shipboard waste management Shipboard waste management Possible improvementsPossible improvements

Tripartite meetingTripartite meeting

15/16 September 2006; Seoul15/16 September 2006; Seoul

dragos.rauta@intertanko.comdragos.rauta@intertanko.com

Shipboard waste managementShipboard waste management

• ER Bilge & Sludge Treatment SystemsER Bilge & Sludge Treatment Systems

• Sewage & Galley effluent Treatment Sewage & Galley effluent Treatment SystemsSystems

• Air Emissions Treatment SystemsAir Emissions Treatment Systems

• GarbageGarbage

INTEGRATED BILGETREATMENT SYSTEM(IBTS)

MSC 55/6/1 – correlationbetween regulations inMARPOL Annexes I & VI

BUT . . . . . .

STILL NEED FORDESIGN & ARRAGEMENTCLARIFICATIONS

ER Bilge & Sludge TreatmentER Bilge & Sludge Treatment Areas for improvement

• Bilge water treatment/OWS Bilge water treatment/OWS systemssystems

• Sludge treatment systemsSludge treatment systems

• Bilge Water/Sludge treatment Bilge Water/Sludge treatment systems interfacesystems interface

Bilge water treatment/OWSBilge water treatment/OWS

• OWS capacity on current designsOWS capacity on current designs– Aframax - Aframax - only 2 cub.m/honly 2 cub.m/h

– Handymax tanker - only 1 cub.m/hHandymax tanker - only 1 cub.m/h

• OWS minimum design criteriaOWS minimum design criteria–Aframax – min. 5 cub.m/hAframax – min. 5 cub.m/h

– Suezmax/VLCC – min. 10 cub.m/hSuezmax/VLCC – min. 10 cub.m/h

• Recommendation:Recommendation: address the issue of address the issue of Oily Water Separator capacityOily Water Separator capacity

Bilge water treatment/OWSBilge water treatment/OWS

• Oily bilge water collecting tankOily bilge water collecting tank

• Recommendation: Recommendation: –Mandate for 2 bilge water collecting tanks, in line Mandate for 2 bilge water collecting tanks, in line

with MEPC.1/Circ.511with MEPC.1/Circ.511

– Increase the volume of bildge water collecting Increase the volume of bildge water collecting tanks (as per MEPC 55/6/1)tanks (as per MEPC 55/6/1)

–Oily bilge water in the bilge wells is transferred to Oily bilge water in the bilge wells is transferred to the bilge primary tank (of cascade type, with the bilge primary tank (of cascade type, with heating possibilities till 90ºC for pre-separation of heating possibilities till 90ºC for pre-separation of oil). The high oil contained water is transferred to oil). The high oil contained water is transferred to sludge tanks and the low oil contained water is sludge tanks and the low oil contained water is transferred to the oily bilge water collecting tank.transferred to the oily bilge water collecting tank.

Sludge treatmentSludge treatment

• Sludge treatment systems should have 2 Sludge treatment systems should have 2 sludge tanks operating either in parallel or in sludge tanks operating either in parallel or in series.series.

• These tanks should have enough heating These tanks should have enough heating capacity to raise the temperature up to 85º C capacity to raise the temperature up to 85º C to assist the separation of the water and also to assist the separation of the water and also boil off some of the water through the boil off some of the water through the venting arrangements.venting arrangements.

• Separate sludge tanks are arranged for Separate sludge tanks are arranged for fuel/diesel oil purifiers and lube oil purifiersfuel/diesel oil purifiers and lube oil purifiers

• Sludge tank design to facilitate cleaningSludge tank design to facilitate cleaning

Sludge tank for separators design

•Tank volume: 2 days storage at adischarge 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 connectionpositioned in the lowest part of the tank.•High level alarm switch, connected to the sludge pump•Heating coil to keep the sludge warm and fluid whilebeing pumped out•Tank ventilation must follow the classification rules forevacuation of gases•There should be a ventilation pipe to fresh air•The ventilation pipe should be straight. Any bends mustbe gradual•The ventilation pipe kept above the tank top•A sludge tank with partition walls must have ventilationpipes in all compartments

Boiler soot washingsBoiler soot washings• Recommendation: Recommendation:

for new buildings, a for new buildings, a separate collecting separate collecting tank for boiler soot tank for boiler soot washings treatmentwashings treatment

IncineratorsIncinerators

• for new buildings:for new buildings:- anticipated sludge production on board will - anticipated sludge production on board will be 0.8% to 1% HFO daily consumption, plus be 0.8% to 1% HFO daily consumption, plus 0.5% MDO daily consumption, plus 15 l every 0.5% MDO daily consumption, plus 15 l every 1000 kw M/E power from drains1000 kw M/E power from drains- sizing of the incinerator based on maximum - sizing of the incinerator based on maximum operation period of 12 hours/day of which operation period of 12 hours/day of which only 10 hours will be used for liquid sludge only 10 hours will be used for liquid sludge and solid waste and the rest of the period to and solid waste and the rest of the period to be used for heating-up/cooling-down, be used for heating-up/cooling-down, cleaning andcleaning and maintenancemaintenance

CONCLUSIONSCONCLUSIONS

• There is room for improvementsThere is room for improvements

• IMO revise its regulationsIMO revise its regulations

• The industry could jointly consider aspects The industry could jointly consider aspects related to design solutionsrelated to design solutions

• Are these a theme for the Tripartite?Are these a theme for the Tripartite?

COMMENTS & DISCUSSIONS WELCOMEDCOMMENTS & DISCUSSIONS WELCOMED

IMO DevelopmentsIMO Developments

• Nov. 1978 – Res. A.393(X) – Recommendation Nov. 1978 – Res. A.393(X) – Recommendation on international performance and test on international performance and test specifications for OWS equipment and OCMspecifications for OWS equipment and OCM

• October 1992 – Res. MEPC.107(49)October 1992 – Res. MEPC.107(49)• September 1997 – Res. MEPC.76 (40) on September 1997 – Res. MEPC.76 (40) on

incineratorsincinerators• October 2004 – Res. MEPC.117(52)October 2004 – Res. MEPC.117(52)• April 2006 – MEPC.1/Circ.511 amended (IBTS)April 2006 – MEPC.1/Circ.511 amended (IBTS)• October 2006 – Danish proposal for further October 2006 – Danish proposal for further

changeschanges