8.(a) State TWO methods of producing fresh water on board an ocean going vessel.(2)
(b) State TWO methods of killing the bacteria which may be present in the water.(2)
(c) Explain the reasons for adding hydrated lime to water produced on board an ocean going vessel.(3)
(d) Outline the procedure to be followed before a fresh water tank is brought back into service.(3)
- With reference to water treatment:
(a) state the treatment required for fresh water taken on from ashore;
(2)
(b) state FOUR properties required for water used for domestic purposes, describing how this may be achieved in EACH case.(8)
- With reference to fresh water treatment:
(a) describe the process for superchlorinating the fresh water system, stating relevant periods, times, and chlorine levels;(6)
(b) explain what is meant by copper staining and the treatment required to prevent it.(4)
6. (a) State THREE types of micro-organisms that may exist in water.(3)
(b) Describe, with the aid of a sketch, the operation of a Silver Ion Sterilizer.(7)