Marpol Annex 4 Discharge Criteria Sewage

Marpol Sewage Discharge Regulations

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

 >The ship is discharging comminuted and disinfected sewage using a system approved by the Administration

> This Should be done at a distance of more than 3 nautical miles from the nearest land, or sewage which is not comminuted or disinfected at a distance of more than 12 nautical miles from the nearest land
>If  the sewage that 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, the rate of discharge shall be approved by the Administration
>The ship has in operation an approved sewage treatment plant which has been certified by the Administration to meet the operational requirements
>The test results of the plant are laid down in the ship's International Sewage Pollution Prevention Certificate
>The effluent shall not produce visible floating solids nor cause discoloration of the surrounding water.

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