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Q7 (10 Marks) International Conventions 🔥 Repeated 2x in exams
SSEP • Written Exam

With regard to Ballast Water Management Convention, explain following:

(a) Ballast Water Exchange Standard (5)

(b) Ballast Water Performance standard (5)

(c) Treatment methods for ballast water (5)

(d) Approval methods for treatment system using active and non-active substances (5)

Appeared In: Mar 2025Oct 2021

✓ Verified Model Answer (Text Solution)

Structured for DG Shipping MEO Class II examination scoring criteria.

Exam Ready

With regard to the Ballast Water Management Convention, explain:

Part (a)

Ballast Water Exchange Standard

Part (b)

Ballast Water Performance standard

Part (c)

Treatment methods for ballast water

Part (d)

Approval methods for treatment system using active and non-active substances

(Refer to the detailed answers for 69ec4c177ace7d7be1426c40 and 69824870f52bf4a49020f423.)

Part (a)

D-1 Ballast Water Exchange Standard: exchange with a volumetric efficiency of at least 95% (or pumping 3 tank volumes flow-through), done in open sea (>200 nm from land, depth >200 m as far as practicable), replacing coastal water with open-ocean water.

Part (b)

D-2 Performance Standard: the discharged ballast water must contain fewer than 10 viable organisms >=50 micrometres per m3, fewer than 10 viable organisms per ml of 10-50 micrometres, and indicator microbes below the limits (V. cholerae <1 cfu/100ml, E. coli <250 cfu/100ml, enterococci <100 cfu/100ml), achieved by an approved treatment system.

Part (c)

Treatment methods: filtration (physical removal), UV irradiation, electro-chlorination/chemical disinfection (oxidising biocides), ozonation, and combinations (filtration + UV or filtration + electro-chlorination); the system must be type-approved and effective across the ship's conditions.

Part (d)

Approval methods: for systems using non-active (physical) substances - type approval by the Administration/RO under the BWMS Code; for systems using active (biocidal) substances - the active substance is first assessed by GESAMP/IMO for environmental and human-health acceptability, then the system is type-approved; the residual biocide concentration must meet the environmental acceptance criteria.

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