Meeting tougher limits on sewage discharge

摘要

The revised MEPC 159(55) MARPOL Annex IV standard mandated that discharges of total suspended solids within 12 miles of shore be less than 35mg/l, compared to the previous maximum of 50mg/l, and that faecal coliform be limited to 100 colony forming units per 100ml, down from 250 units per 100ml previously. Biochemical oxygen demand (BOD5) is capped at 25mg/l, down from 50mg/l. The new requirements apply to vessels above 400gt and smaller vessels with a crew of 15 or more, with a keel-laying date or sewage plant installation or delivery on or after 1 January 2010.