1 Introduction
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Marine Environment Protection Committee - Resolution MEPC.157(55) - Recommendation on Standards for the Rate of Discharge of Untreated Sewage from Ships - (Adopted on 13 October 2006) - Annex - Recommendation on Standards for the Rate of Discharge of Untreated Sewage from Ships - 1 Introduction

1 Introduction

  1.1 Regulation 11.1.1 of the revised Annex IV of MARPOL 73/78 requires that untreated sewage, which may be discharged at more than 12 nautical miles from the nearest land, should not be discharged instantaneously but at a moderate rate of discharge when the ship is en route and proceeding at a speed not less than 4 knots, while the rate should be approved by the Administration based upon standards developed by the Organization. This Recommendation provides the standard and guidance for the approval and calculation of a moderate rate of discharge.

  1.2 A moderate rate of discharge applies to the discharge of untreated sewage that has been stored in holding tanks.

  1.3 This standard does not incorporate the dilution of sewage with water or greywater into calculations of the discharge rate. Therefore the rate is a conservative estimate and it is recognised that discharges of sewage in accordance with this standard will present a higher level of protection to the marine environment due to mixing prior to the actual discharge in addition to the mixing action of the ship's wake.

Parent topic: Annex - Recommendation on Standards for the Rate of Discharge of Untreated Sewage from Ships
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