Page 161 - Introduction to Marine Engineering

Auxiliaries

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Extent of packaged plant
Gate valve
1 WCs and urinals
Butterfly valve
2 Separation section
Non return valve 3 Separated liquids tank
£s Screw down non return valve 4 Separated solids tank
5 Tablet tray
Ad Pressure relief valve 6 Treatment tank
7 Self cleaning filter
8 Grinder pump
9 Sullage pump
10 Sanitary pump
11 Sanitary pump
12 Accumulator
13 Control panel
14 Sullage tank
15 Overflow
16 Overboard discharge
17 Deck discharge to shore facility
18 External flushing water supply
19 Pressure gauge
20 Treatment tank vent
21 Sullage tank vent
Figure 7.9 Chemical sewage treatment plant

aeration compartment where it is digested by aerobic bacteria and
micro-organisms, whose existence is aided by atmospheric oxygen which
is pumped in. The sewage then flows into the settling compartment
where the activated sludge is settled out. The clear liquid flows to the
chlorinator and after treatment to kill any remaining bacteria it is
discharged. Tablets are placed in the chlorinator and require