Explain the difference between cargo residue and wash water in the context of MARPOL.

Explain the difference between cargo residue and wash water in the context of MARPOL.

• A. Cargo residue is outside the tank; wash water inside; neither require treatment.
• B. Cargo residue is leftover cargo within the tank; wash water is water used to clean; both require treatment and proper disposal.
• C. Cargo residue refers to sludge in ballast only; wash water is seawater used for cooling.
• D. Cargo residue is the same as wash water.

Answer: (B)