MARPOL ANNEX IV(Regulation for the Prevention of Pollution by Sewage from Ships)

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MARPOL ANNEX IV

Regulation for the Prevention of Pollution by Sewage from Ships

  1. Shipboard Sewage Pollution Sources
  • Drainage and other wastes from any form of toilets and urinals (Black Water)
  • Drainage from medical premises (dispensary, sickbay, etc) via wash basins, wash tubs and scuppers located in such premises
  • Drainage from spaces containing living animals
  • Other waste waters when mixed with the drainages defined above

[Regulations not applicable to the disposal of grey water (drainage from dishwasher, shower, laundry, bath and washbasin drains)]

 

  1. Application
  • new ships of > 400 GT
  • new ships < 400 GT (certified to carry over 15 persons)

(new ships: building contract or keel laid on/after 27th Sep 2003 or delivered on/after 27th Sep 2006)

  • existing ships of > 400 GT
  • existing ships < 400 GT (certified to carry over 15 persons)

 

  1. 3. Equipment (& Tank) Requirements
  2. discharge pipeline fitted with standard discharge connection (applies to all new ships contracted for construction on/after 1st Jan 2007)

and

  1. approved sewage treatment plant

                     or

comminuter / disinfection system with temporary means of storage

                      or

holding tank

An approved sewage treatment plant shall be of a type approved by the Administration, following the IMO standards and test methods

(its test results are noted on the ISPPC and the effluent does not produce visible floating solids nor cause discoloration of the surrounding water)

  • A sewage comminuting and disinfecting system approved by the Administration shall be fitted with temporary storage of sewage when the ship is less than 3 nautical miles from the nearest land
  • A sewage holding tank shall:
  • have appropriate capacity for the retention of all sewage,
  • be correctly constructed with a means to indicate visually the amount of its contents, and

-be equipped with the ship’s discharge line to port/terminal reception facilities fitted with the standard discharge connection

 

  1. Sewage Treatment System Capacity
  • no MARPOL regulations and guidelines for handling of any plant or holding tank
  • the capacity depends on:
  • type of flushing system,
  • the number of people onboard
  • Ship;s type,
  • Trading pattern, etc

 

5.(a) Control of discharge of sewage

Based on the type of equipment on the Ship

The discharge of sewage into the sea is prohibited, except when:

-The ship is discharging comminuted and disinfected sewage using an approved system at a distance of more than 3 nm from the nearest land;        –                                                    or

  • the ship is discharging sewage which is not comminuted and disinfected at a distance of more than 12 nm from the nearest land, provided that in any case, the sewage stored in holding tanks or sewage originating from the spaces containing living animals, shall not be discharged instantaneously but at a moderate rate when ship is en route and proceeding at not less than 4 knots;
  • or
  • the ship is discharging sewage using an approved sewage treatment plant

 

5 (b). Control of discharge of sewage

         Based on discharge distance

  • while operating within 3 nm from the nearest land – discharge is prohibited unless properly treated using an approved sewage treatment plant
  • discharge within 3 – 12 nm from the nearest land must either: meet the effluent requirements within 3 nm from the nearest land or the ship is discharging comminuted and disinfected sewage using an approved comminuter/disinfection system
  • discharge at a distance of more than 12 nm from the nearest land must either: meet effluent requirements within 3 nm or within 3-12 nm from the nearest land or the sewage that has been stored in holding tanks shall not be discharged instantaneously but at a moderate rate when the ship is en route and proceeding at not less than 4 knots;

 

EFFLUENTS:       BOD < 25 mg/l        T.S.S. < 35 mg/l        COLIFORMS   < 100 col/100ml

Addition of nutrients causing algal blooms and reduced oxygen levels – serious health risk to people

 

  1. Special Areas Baltic Sea The new special area requirements, which entered into force on 1 January 2013, will only take effect upon receipt of sufficient notifications on the existence of adequate reception facilities from Parties to MARPOL Annex IV whose coastlines border the relevant special area

 

(i) Chemical Sewage Treatment Plant

 

(ii) Biological Treatment Plant

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