MARPOL

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Chemical Sewage Treatment Plants (2)• A mechanical instrument known as comminutor is used to helpbreaking down of the solid particles to smaller ones. The liquidsewage remains at the top and the solid particles settle down,which are then discharged to a sewage tank.• The liquid sewage is chemically treated and is used for toiletflushing purposes. The sewage from the sewage tank isdischarged to the shore collecting facilities.• It is important to supply adequate quantity of chemicaldosages to prevent odor and corrosion due to high level ofalkalinity.M.Ventura MARPOL 7Biological Sewage Treatment Plants (1)• Uses bacteria to facilitate theprocess of breaking down of solidconstituents.• It generates an oxygen richatmosphere that aerobic bacteriautilizes to multiply and disintegratethe sewage waste to convert it intosludge (aeration process).• The whole plant is divided into threecompartments:– Aeration compartment– Settling compartment– Chlorine treatment compartment.M.Ventura MARPOL 84
Biological Sewage Treatment Plants (2)• Sewage enters the sewage treatment plant first through theaeration compartment. Aerobic bacteria digests the sewage wasteand reduce it to small particles. A continuous supply of atmosphericoxygen is provided to increase the rate of digestion process.• The disintegrated solid waste is then transferred to the settlingcompartment where the solid constituents settle down under theeffect of gravity.• The liquid at the top is then passed to the chlorine treatmentcompartment. In this compartment the liquid water is treated withchlorine and other chemicals to kill any surviving bacteria. Once donethe water is then discharged into the sea.• The process of chlorination is facilitated with the help of chlorinetablets. The sludge that settles down in the settling compartment isremoved and stored in a storage tank to later discharge it to shorefacilities or decontrolled areas.M.Ventura MARPOL 9Discharge of Sewage• The discharge of sewage into the sea is prohibited, exceptwhen:1. The ship is discharging• comminuted and disinfected sewage at a distance > 3 nauticalmiles from the nearest land, or• sewage which is not comminuted or disinfected at a distance> 12 nautical miles from the nearest land,provided that in any case, the sewage shall not be dischargedinstantaneously but at a moderate rate when the ship is en routeand proceeding at V ≥ 4 knots2. The ship has in operation an approved sewage treatment plantand additionally, the effluent shall not produce visible floatingsolids nor cause discoloration of the surrounding water.M.Ventura MARPOL 105
Page 1 and 2: International Convention for The Pr
Page 3: Sewage SystemsEvery ship which shal
Page 7 and 8: Definitions• Garbage - means all
Page 9 and 10: Garbage Processing Equipment (1)•
Page 11 and 12: Special AreasFor the purpose of thi
Page 13 and 14: Compaction Options on BoardM.Ventur
Page 15 and 16: DefinitionsEmission - means any rel
Page 17 and 18: Annex VI Revision• The revised MA
Page 19 and 20: Retention of the Ballast Water on B
Page 21: Ballast Water Management• Entries

MARPOL

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