Class 2 (2nd Engineer) MEKG 📅 Oct 2019

Exam Question

Reverse osmosis is the modern alternative for shipboard production of drinking water.

(a) Describe using simple diagrams if necessary, the principle of reverse osmosis

(b) Sketch a line diagram showing a single pass system for producing fresh water from seawater and describe the system.

Reference Answer

### Part (a): The Principle of Reverse Osmosis
#### 1. Natural Osmosis
Osmosis is a naturally occurring phenomenon and is the foundation for understanding reverse osmosis. It is defined as the net movement of solvent molecules (in this case, water) through a selectively permeable membrane from a region of high solvent potential (low solute concentration) to a region of low solvent potential (high solute concentration).
* **Semi-Permeable Membrane:** This is a barrier that allows the passage of solvent (water) molecules but blocks the passage of larger solute molecules (salts, minerals, impurities).

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