oil spill , effects & managementmsc chitra oil spill off mumbai • august 7, 2010 (09.48 hrs )...
TRANSCRIPT
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Oil Spill , Effects & Management
Dr. S.P. FondekarChairman, Environment Expert Committee
Govt of Goa
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Weathering processes with time
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EFFECTS OF OIL
• marine life(benthic organisms, fish, sea birds)
• marine ecosystems(marshes, mangroves, corals)
• coastal activities(bathing, boating, diving, shoreline contamination)(damage to sand dunes & change in natural profile of the beach)(impact on fisheries & aquaculture)
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Polluted marsh land
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Mangroves
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BOOM
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Curtain boom
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Self-inflating boom
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dispersants• solvent, surfactant• redistributes oil• quick response• no fire risk and birds risk• inhibits ‘mousse’ formation• biodegradation helpdispersants - disadvantages• oil not removed• ecology impact• not on viscous oils (>2000 cSt)• approval neededavoid use near• water intakes• salt marshes• coral reefs• stagnant water• mangroves• fish hatcheries
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NUMBERS OF SPILLS OVER 700 TONNES(1970-2008)
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QUANTITIES OF OIL SPILT(1970-2008)
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INCIDENCE OF SPILLS < 7 TONNES BY CAUSE (1974-2008)
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INCIDENCE OF SPILLS 7-700 TONNES BY CAUSE (1974-2008)
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INCIDENCE OF SPILLS >700 TONNES BY CAUSE (1974-2008)
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• tanker : Exxon Valdez (987 ft)
• year : 1989 (Prince of William Sound)• struck reef• carried : 170000 tons• spilt : 35000 tons• delay in mobilising equipment• 2 billion dollars• 82 aircrafts, 1436 vessels used• 420,000 feet of boom used• 1100 miles affected• 33000 birds
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SHORELINE CLEAN-UP
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MAJOR OIL SPILLS IN INDIAN WATERS
•tanker : Transhuron•year : 1974 (Laccadives)•spilt : 36000 tons
•Sagar Vikas (blow out)•year : 1982 (Bombay High)•spilt : 5000 tonnes
•tanker : Maersk Navigator•year : 1992 (Andaman Sea)•spilt : 25000 tonnes
•Bombay High (Offshore)•year : 1993•pipe line leakage•spilt : 1600 tonnes
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MAERSK NAVIGATOR
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BOMBAY HIGH (Offshore)
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•5 June 1994 - ore carrier grounded near Sinquerim, Goa.•1000 t residual oil•13 June 1994 - coast guard began oil flushing•2 July 1994 - crack developed. 2 t spill•800 l dispersant used for spill•12 July 1994 - oil flushing ended
MV SEA TRANSPORTER
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MV SEA TRANSPORTER
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• 23 March, 2005, iron-ore barge ‘Prapti’ collided with a Singaporean bulk carrier ‘Maritime Wisdom’.
•4 nautical miles off Aguada, Goa
•Spilled about 110 tonnes of HFO.
•Rupture was sealed and the remaining cargo was transformed to another tank.
•Oil spread over an area of 2.3 miles2
•Dispersant treatment was carried out.
•25 March, 2005, pollution response was withdrawn.
MARITIME WISDOM
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Puncture (150/75mm) into oil tank
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Heavy fuel oil spillage
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Coast Guard response vessel
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MSC Chitra Oil Spill off Mumbai
• August 7, 2010 (09.48 hrs ) - MSC Chitra collided with MV Khalijia – III about 10 Km off Mumbai coast
• 2662 tonnes fuel oil283 tonnes diesel88040 litres of lubricant
• 1200 containers ( sodium hydroxide & pesticides )
• vessel tilted 45 degrees soon after collision
• spillage of about 400 tonnes
• Coast Guard began combating operation on 8 August using oil spill response vessels and aircrafts for spraying dispersants
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• oil spillage on beaches of Mumbai and neighbouringRaigad areas.
• oil also sighted at Sewri and Colaba areas.
• 300 containers tumbled into water so far.
• pesticides bottles were found in Colaba & Raigad areas
• Mumbai & JNPT ports closed for the heavier traffic
• MPT hired SMIT salvage, Netherland company to salvage the containers and resurface the vessel.
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MSC Chitra
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WASTE MANAGEMENT
• 1000 m3 - 25% evaporation
• 750 m3 - emulsify (80% water)
• 3750 m3 - 20% recovered
• 3000 m3 - (10 - 20) * qty beached
• 30000 m3 - 60000 m3 for disposal
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THANK YOUTHANK YOU