5.(a) State the MARPOL Annex number which deals with the disposal of sewage.(1)
(b) With reference to the Annex stated in part (a), state the rules for EACH of the following:
(i) when the sewage is untreated;(2)
(ii) when the sewage is comminuted and disinfected.(2)
(c) Explain why the final discharge from an approved sewage treatment plant is chlorinated before discharge.(2)
(d) Explain how chlorination is carried out and monitored.(2)
(e) State the correct chlorine content of the final discharge.(1)
6.With reference to sewage treatment plants:
(a)
state the purpose of the vent, and explain why it is fitted with a gauze;(3)
(b) explain the difference between aerobic and anaerobic micro organisms;(3)
(c) explain why air is bubbled through the effluent in the aeration tank;(2)
(d) explain why calcium hypochlorite is added to the treated sewage before discharge overboard.(2)
- With reference to sewage treatment plants:
(a) describe the biological operating principle of an aerobic sewage treatment plant, explaining the dangers if a supply of oxygen is not present;(8)
(b) state how a sufficient supply of oxygen is ensured.(2)
- (a) State the IMO regulations for the disposal of sewage.(4)
(b) With reference to aerobic sewage treatment plants, explain EACH of the following:
(i) why air is bubbled through the effluent in the aeration tank;(2)
(ii) why care must be taken over the choice of toilet cleansers used;(2)
(iii) why calcium hypochlorite is added to the treated sewage before discharge overboard.(2)
5.(a) With reference to sewage treatment systems, explain EACH of the following terms:
(i) aerobic;(2)
(ii) anaerobic.(2)
(b) Sketch a Biological Sewage Treatment Plant, labelling the MAIN compartments and indicating the direction of flow through the plant.(6)
- With reference to sewage treatment plants:
(a) explain the difference between black water and grey water;(2)
(b) explain the difference between aerobic and anaerobic micro organisms;(3)
(c) list THREE dangerous gases produced under anaerobic conditions;(3)
(d) explain the dangers of producing the gases listed in part(c) in a confined space.(2)
- (a) State the THREE main stages of a Biological Sewage Treatment Plant.(3)
(b) Describe the operation of a Biological Sewage Treatment Plant, explaining the process carried out in EACH of the stages stated in part (a).(7)
6.(a) With reference to MARPOL Annex IV, explain what is meant by the term sewage.(4)
(b) State the current regulations for the discharge of sewage.(6)
- With reference to sewage treatment plants:
(a) describe the biological operating principle of an aerobic sewage treatment plant, explaining the dangers if a supply of oxygen is not present;(8)
state how a sufficient supply of oxygen is ensured.(2)
- Explain, with the aid of a sketch, how an Aerobic Sewage Treatment plant operates.(10)
Hotel Service Unit 10 Q10 Quiz
- Describe the operation of a Biological Sewage Treatment Plant.(10)